Toro 20330 Service Manual

Toro 20330 - Low Wheel Walk Power Mower Manual

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  • Toro 20330 | Service Manual - Page 1
    WALK BEHIND POWER MOWER DRIVE SYSTEMS SERVICE MANUAL
  • Toro 20330 | Service Manual - Page 2
  • Toro 20330 | Service Manual - Page 3
    effort to make the information in this manual complete and correct. This manual was written with the assumption that the reader has basic mechanical knowledge and skills. This book contains material covering the Toro and Lawn-Boy Walk Behind Mower Drive Systems models from 1990 through 2006, and
  • Toro 20330 | Service Manual - Page 4
    THIS PAGE INTENTIONALLY LEFT BLANK.
  • Toro 20330 | Service Manual - Page 5
    2 7-6 Lawn-Boy Sens-a-Speed 7-9 Belt Replacement Mowers with Toro Blade Brake Clutch 8-3 Mowers with Toro Blade Override System 8-3 Zone start 21" Rear Wheel Drive Toro & Lawn-Boy (except Insight 8-2 Zone start 22" Toro Rear Wheel Drive 3-10 Zone start 22" Toro Front Wheel Drive 3-5 Lawn-Boy
  • Toro 20330 | Service Manual - Page 6
    Remove Transmission 3-5 Transmission Disassembly 3-7 Transmission Assembly 3-7 Assembly Tips 3-8 Belt Service - Front Wheel Drive Models 3-9 22" TORO & LAWN-BOY REAR WHEEL DRIVE MODELS Transmission Removal & Belt Replacement 3-10 Rear Axle Disassembly 3-15 Transmission Disassembly 3-16
  • Toro 20330 | Service Manual - Page 7
    BBC Cable Installation (Toro Vacu Power/Lawn-Boy Medallion 6-20 ENGINE & BLADE ASSEMBLY (Toro Recycler/Rear Bagger 6-21 TORO RECYCLER/REAR BAGGER BBC 6-22 Idler Arm System Disassembly (Recycler/Rear Bagger 6-22 Idler Arm System Assembly (Recycler/Rear Bagger 6-25 WPM Drive Systems Manual iii
  • Toro 20330 | Service Manual - Page 8
    Cable Adjustment 7-18 SELF-PROPEL BELT REPLACEMENT Toro 21" Front Wheel Drive 8-2 22" Front Wheel Drive 8-2 22" Rear Wheel Drive 8-2 21" Steel & Cast Deck Toro & Lawn-Boy Mowers Belt Replacement 8-2 21" Cast Deck Mowers with 3 Speed Transmission 8-2 21" Toro & Lawn-Boy Mowers with Blade
  • Toro 20330 | Service Manual - Page 9
    service manual for the mower being serviced. Code List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade SB RK SB RK Handle Repair Blade Clutch 2B None 2B
  • Toro 20330 | Service Manual - Page 10
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade RK 3S RK 3S RK 3S RK 3S RK Handle Repair Blade Clutch 2B 2B 2B 2B 2B 2B 2B 2B 2B Drive Systems Manual
  • Toro 20330 | Service Manual - Page 11
    Drive Systems Manual TABLE OF CONTENTS Code List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade 3S RK 3S RK Handle Repair Blade Clutch 2B None 2B None
  • Toro 20330 | Service Manual - Page 12
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade RK RK RK SR RK RK RK RK Handle Repair Blade Clutch None None None None None None None Drive Systems Manual
  • Toro 20330 | Service Manual - Page 13
    Drive Systems Manual TABLE OF CONTENTS Code List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade 3SP RK 3SP RK Handle Repair Blade Clutch PP2 1B PP2 PP2
  • Toro 20330 | Service Manual - Page 14
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade RK SB RK SB RK B SR B SR Handle Repair Blade Clutch BBC BBC 1B 1B 1B BBC BBC 1B Drive Systems Manual
  • Toro 20330 | Service Manual - Page 15
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade SB RK SB RK SB RK SB RK Handle Repair Blade Clutch 1B BBC 1B 1B 1B 1B BBC 1B Drive Systems Manual xi
  • Toro 20330 | Service Manual - Page 16
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade RK 3 SP RK 3 SP RK 3 SP RK Handle Repair Blade Clutch PP2 1B 1B 1B 1B 1B 1B 1B 1B Drive Systems Manual
  • Toro 20330 | Service Manual - Page 17
    List 1B - one bail 2B - two bail 3S- 3 speed 21" stl - 21" steel deck 22" stl - 22" steel deck B- bevel gear BBC - blade brake clutch BBC VP - blade brake clutch for Vacu Power BOS - blade SP RK SB RK SB RK SB RK Handle Repair Blade Clutch BBC BBC 1B 1B 1B 1B 1B Drive Systems Manual xiii
  • Toro 20330 | Service Manual - Page 18
    TABLE OF CONTENTS THIS PAGE INTENTIONALLY LEFT BLANK. xiv WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 19
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 1-1
  • Toro 20330 | Service Manual - Page 20
    second version is constant mesh and is used on International 48cm rear wheel drive mowers. INTERNALLY CLUTCHED Description This is a worm and helical gear transmission. The worm shaft (input shaft) is driven by a belt from the engine crankshaft. A spring which hooks into the tab on the front of the
  • Toro 20330 | Service Manual - Page 21
    WORM DRIVE TRANSMISSION Lubrication This transmission requires 90 wt. gear oil. A variable weight such as 85w90 is acceptable as long as the range includes 90 weight. The second part of the requirement is an EP rating of GL 5 or higher. The transmission has a fill/check plug in the front. With the
  • Toro 20330 | Service Manual - Page 22
    point straight down. (This removes the tension from the pivot arms so the roll pin can be removed) (Fig. 006). 2. Raise the front of the mower off the bench and support it with blocks. 3. Disconnect the shift cable. Fig 006 3428-0131 1-4 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 23
    from the chassis. 9. Reverse the procedure to install. NOTE: Support the wheel pinions with the wood block while driving the roll pins in. This will prevent the axle from being bent. Fill the transmission with oil after it is installed in the mower (Fig. 009). Note the front of the transmission is
  • Toro 20330 | Service Manual - Page 24
    jaw to the side and drive the roll pin out of the sleeve and axle (Fig. 012). Fig 010 3428-0146 3. Remove the 4 self-tapping screw that connect the top and bottom cases. Note: If you turn this transmission on its side or upside down, oil may leak out of the top. This
  • Toro 20330 | Service Manual - Page 25
    WORM DRIVE TRANSMISSION 9. Clean the old gasket material from the mating surfaces of the case and cover. 10. A hook or small screwdriver can be used to pry the seals out of the case. 11. An arbor press or large vise will be needed when removing and replacing the bushings. 12. Clean the oil residue
  • Toro 20330 | Service Manual - Page 26
    WORM DRIVE TRANSMISSION Note: The bushings are two different lengths. The side of the case with the thicker boss uses a longer busing to support the axle. The bushings should be flush with the inside of the case (Fig. 016). A 3. Note: Some replacement axles have more than one hole that can be used
  • Toro 20330 | Service Manual - Page 27
    on the bottom case and start the 4 self-tapping screws. Do not fully tighten them. 8. Install the front and rear roll pins to align the cover and case. Then secure the 4 self-tapping screws. There are two control cables used with this system. One cable operates the engine kill switch and flywheel
  • Toro 20330 | Service Manual - Page 28
    adjust, pull the control to the rear (disengage). Go to the cable clamp/adjustment. Loosen the clamp, pull the cable to the rear until the shift lever is as far back as it will go. Hold it there and tighten the clamp (Fig. 021). A A. Cable Clamp Fig 021 3428-0127 1-10 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 29
    the belt. Internal repair procedures are the same, as is the lubrication requirement, 90 wt. gear oil rated GL-5 or higher. 1. Jam nut 2. Lock washer 3. Half pulley 4. V Belt 5. Pulley spacer 6. Gearbox cover 7. Shaft & worm 8. Ball bearing 9. Gearbox gasket 10. Check plug 11. Gasket check plug 12
  • Toro 20330 | Service Manual - Page 30
    Nut 2 Needle Bearing 2 Friction Washer 1-12 Ref. No. 16 17 18 19 20 21 22 23 24 25 26 27 28 34 35 Fig 023 20911B sprearaxleassy Qty Description 4 Keyed Thrust Washer Washer 2 Rear Suspension Plate 4 Thread Forming Screw 2 Roll Pin 1 Gearbox Assembly WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 31
    turn clockwise to tighten the belt, or ½ turn counterclockwise to loosen the belt. Hold the control cable while rotating the knob to prevent the cable from turning (Fig. 024). Controls 1. Knob Fig 024 2. Cable fig 19 Adjusting Wheel Traction Drive 1. Stop the engine. 3. To check the adjustment
  • Toro 20330 | Service Manual - Page 32
    WORM DRIVE TRANSMISSION 4. If loss of traction or improper engagement still occurs after adjustment, repeat steps 2 - 3 until properly adjusted. WHEEL CLUTCH See Rocking Key Wheel Clutch, page 5-3. 1-14 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 33
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 2-1
  • Toro 20330 | Service Manual - Page 34
    SINGLE SPEED SPUR/BEVEL GEAR TRANSMISSION GEAR CASE ASSEMBLY Ref. No. 1 2 3 4 5 6 7 8 9 10 Qty Description 1 Gear Case Casting 1 Gear Case Cover Half 2 Ball Bearing 2 Pulley Spacer 2 Bevel Gear 15t Spur, 37t 2 Pinion Gear Bevel 2 Gear 2 Output Shaft WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 35
    (7.1cc - 9.0cc) of lithium based No. 2 grease. Transmission Removal and Replacement 1. Raise the rear of the mower and support with a block (Fig. 027). Fig 028 PICT-1873a 5. Continue disassembly, remove 029). A. Wood block A Fig 027 PICT-1870 WPM Drive Systems Manual Fig 029 PICT-1874a 2-3
  • Toro 20330 | Service Manual - Page 36
    SINGLE SPEED SPUR/BEVEL GEAR TRANSMISSION 6. Remove the belt guide. Note the location of the spacer under the front mounting screw (Fig. 030). Do not try to force the belt off the pulley without removing the belt guide. This often results in damage to the belt or slightly bending the belt guide,
  • Toro 20330 | Service Manual - Page 37
    SPEED SPUR/BEVEL GEAR TRANSMISSION Before removing the parts from the case, note the quantity and location of the thrust washers (Fig. 034). Clean the gears in solvent and inspect carefully. Any damaged gear must be replaced. Also replace is replaced. The 035). Replace as the parts manual if
  • Toro 20330 | Service Manual - Page 38
    is wise to apply a light coating of engine oil to the running surface (Fig. 037). Add grease and install the cover. Insert the transmission back into the chassis. Refer to the section on the wheel pinion clutch for assembly instructions. Install self propel cable. Adjust as needed; see "Handles and
  • Toro 20330 | Service Manual - Page 39
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 3-1
  • Toro 20330 | Service Manual - Page 40
    EXPLODED VIEW - SINGLE SPEED BEVEL GEAR TRANSMISSION A B I H C D E F G J K L M A. Nut B. Washer C. Pulley D. Spacer E. Housing F. Bearing G. Pinion H. Bushing I. Thrust washer J. Bevel Gear K. Bushing L. Roll pin M. Axle Fig 039 single speedtrans a 3-2 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 41
    in constant mesh. Clutching is done by rocking the transmission to tighten or loosen the drive belt (Fig. 040). The control cable will move the transmission to tighten the belt. When released, the weight of the transmission causes it to rock towards the engine to disengage. Fig 040 MVC-485 WPM
  • Toro 20330 | Service Manual - Page 42
    SINGLE SPEED BEVEL GEAR TRANSMISSION FRONT AXLE AND TRANSMISSION ASSEMBLY Ball 3-4 Ref. No. 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Fig 041 3354-613(5) Qty Description 2 V-Belt 2 Pulley-Half, Front 1 Washer-Flat 1 Nut-Lock 1 Cover-Belt, Front 1 Washer WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 43
    22" FRONT WHEEL DRIVE MODELS Remove Transmission 1. Block the front of the mower up. There are two screws that secure the belt cover to the housing. They are accessed from the bottom (Fig. 042). 4. Remove the nut, washer, transmission pulley halves, and spacer. 5. Remove the belt guide
  • Toro 20330 | Service Manual - Page 44
    SINGLE SPEED BEVEL GEAR TRANSMISSION 9. Remove the two bolts and nuts securing each pivot arm to the housing. There is a notch in the pivot pivot arm assembly, compress the components with two clamps or locking pliers (Fig. 048). Fig 046 PICT-1857a 3-6 Fig 048 MVC-478 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 45
    SINGLE SPEED BEVEL GEAR TRANSMISSION The snap ring can now be removed. Loosen the clamps with care due to the spring arm tension. Separate out (Fig. 050). Fig 051 Transmission Assembly Assemble in reverse order. See Assembly Tips next page. MVC-468 Fig 050 MVC-462 WPM Drive Systems Manual 3-7
  • Toro 20330 | Service Manual - Page 46
    SINGLE SPEED BEVEL GEAR TRANSMISSION Assembly Tips 1. The same axle is used for both front and rear drive versions. There are two holes in the axle about one inch apart. Front wheel drive transmissions use the hole in the axle from the spring arm. Fig 053 MVC-468 3-8 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 47
    molybendum disulfide base grease or anti-seize compound before installing the pinion (Fig. 055). Belt Service - Front Wheel Drive Models To replace the self-propelled drive belt, proceed as follows: 1. Drain the fuel and oil and tip the mower on its right side. 2. Remove the two screws securing the
  • Toro 20330 | Service Manual - Page 48
    the belt guide (Fig. 059). 22" TORO & LAWN-BOY REAR WHEEL DRIVE MODELS Transmission Removal and Belt Replacement On rear wheel drive models, it is necessary to separate the rear drive assembly from the mower housing in order to change the drive belt. 1. Drain fuel and oil from the engine. 2. Remove
  • Toro 20330 | Service Manual - Page 49
    an arm on the transmission belt guide (Fig. 063). A. Cable tool Fig 064 PICT-1895a A 7. With the plug removed from the larger hole next to the cable, move the cable through the slot (Fig. 065). B A. Cable Fig 063 B. Belt guide PICT-1884a WPM Drive Systems Manual Fig 065 PICT-1904 3-11
  • Toro 20330 | Service Manual - Page 50
    and remove the blade. 13. Remove one of the belt guide screws and loosen the other enough to pivot the guide away (Fig. 069). Do not bend the belt guide. Slide the pulley/blade adapter and belt off the crankshaft. A A. Stop cable Fig 067 DSC-017 3-12 Fig 069 MVC-738 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 51
    070 MVC-848 A. Belt cover Fig 072 MVC-743 15. There is a cross brace underneath the mower that is held in place by two of the cap screws shown above (Fig. 071). 17. Remove 3 screws that secure the belt cover to the housing (Fig. 073). Fig 071 MVC-852 WPM Drive Systems Manual Fig 073 MVC
  • Toro 20330 | Service Manual - Page 52
    Do not bend the belt guide. The pulley must be lifted up slightly to slip the belt off. Fig 076 MVC-741 21. Pull the belt towards the crankshaft and remove. If only the belt is to be replaced, install a new one now. Reverse the process to assemble. If transmission service is necessary proceed as
  • Toro 20330 | Service Manual - Page 53
    SINGLE SPEED BEVEL GEAR TRANSMISSION Rear Axle Disassembly 1. Remove the klip rings and thrust washers that secure the pinions to the axle ( with 2 pairs of locking pliers or other clamps and remove the snap ring (Fig. 080). Fig 078 MVC-850 WPM Drive Systems Manual Fig 080 MVC-748 3-15
  • Toro 20330 | Service Manual - Page 54
    SINGLE SPEED BEVEL GEAR TRANSMISSION 6. You can now release the clamps and separate the HOC plate, spring arm, and pivot arm (Fig. 081). 2. Since gear can be lifted out (Fig. 082). Fig 083 Transmission Assembly Assemble in reverse order. MVC-470 Fig 082 MVC-462 3-16 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 55
    SINGLE SPEED BEVEL GEAR TRANSMISSION Axle Assembly Tips 1. The same axle is used for both front and rear wheel drive models. There are two holes in the axle about one inch apart. Rear wheel drive models use the , away from the gear teeth (Fig. 084). WPM Drive Systems Manual Fig 086 MVC-748 3-17
  • Toro 20330 | Service Manual - Page 56
    and L for right and left. Identify right and left from the operator's position (Fig. 088). On the right side, the R should face outward. The letter L should face outward on the left side. If the wheel pinions are reversed, the wheels will not drive. R Fig 088 MVC-474 Note: See Chapter 5 for more
  • Toro 20330 | Service Manual - Page 57
    21 22 23 24 25 27 28 Qty Description 2 Spring-Compression 2 Key 1 Transmission ASM 1 Washer-Shield 1 Bracket-Transmission 2 Screw-HWH 1 Spacer 2 Pulley-Half 1 V-Belt 1 Washer-Flat 1 Nut-Lock 1 Shield-Trailing 1 Washer 1 Arm-Rear Pivot, RH WPM Drive Systems Manual 3-19
  • Toro 20330 | Service Manual - Page 58
    SINGLE SPEED BEVEL GEAR TRANSMISSION Transmission Removal & Belt Replacement The following steps will show one method of replacing the belt or removing the transmission on the Lawn-Boy Insight mowers. 1. Prepare the mower. Drain the gas and oil and disconnect the spark plug wire. 2. Remove two
  • Toro 20330 | Service Manual - Page 59
    SINGLE SPEED BEVEL GEAR TRANSMISSION 7. Lift the top half of the transmission pulley off. If just replacing the belt, push the belt into the cutting chamber and slip the belt over the blade. Reverse the process to install the new belt (Fig. 094). Note: Do not get anti-seize on the belt or the drive
  • Toro 20330 | Service Manual - Page 60
    SINGLE SPEED BEVEL GEAR TRANSMISSION 11. Remove klip ring, keyed thrust washer, and standard thrust washer (left side of mower has the standard Unhook the traction cable from the transmission belt guide (Fig. 101 and Fig 102). Fig 099 PICT-1921a Fig 101 PICT-1923 3-22 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 61
    SINGLE SPEED BEVEL GEAR 2 pulley halves, and spacer from the transmission input shaft. Remove 2 screws securing the belt guide to the transmission (Fig. 103). Fig 104 MVC-300 17. The last step is 103 D. Pulley half E. Washer F. Nut PICT-1926 Fig 105 MVC-301 WPM Drive Systems Manual 3-23
  • Toro 20330 | Service Manual - Page 62
    SPEED rear wheel drive models. There are two holes in the axle about one inch apart. Rear wheel drive models longest hub face the short end of the axle. Drive the pin into place. A double check is that the bearings and thrust washer off the axle. Drive the roll pin out and the bevel gear can then
  • Toro 20330 | Service Manual - Page 63
    SPEED BEVEL GEAR TRANSMISSION 2. Install the thrust washer on the side of the gear with the shortest hub, away from the gear teeth (Fig. 108). 3. Install the transmission bearings with the flange facing the gear (Fig. 109). Transmission Installation Tips 1. Reconnect the cable to the belt guide
  • Toro 20330 | Service Manual - Page 64
    screws. Over-tightening can cause the belt guide to deform and cause the belt not to declutch properly. Tighten firmly with a ratchet. Note: Wheel Clutch Service - see Spring Ratchet Key Style Clutch, page 5-8. Control Cable Adjustment - see Handles & Control Cables. 3-26 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 65
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 4-1
  • Toro 20330 | Service Manual - Page 66
    THREE SPEED TRANSMISSION GEARCASE ASSEMBLY Ref. No. - Gear, Upper 1 Cover - Case, Gear 6 Screw - Tapping 4-2 Ref. No. 21 22 23 24 26 27 28 29 30 31 32 34 36 37 38 Fig 114 gearcaseassy Qty Description Shift 1 Clip - Spring 1 Sleeve - Key, Shift 2 Key - Shift WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 67
    pivoting the transmission. When the operator squeezes the control bar toward the handle, a control cable tilts the transmission backward and tensions the belt. When the control bar is released, gravity pivots the transmission forward to loosen the belt. Belt guides at the engine pulley and atop the
  • Toro 20330 | Service Manual - Page 68
    (Fig. 117). A B C A. Gear Sleeve B. Shift Collar Fig 117 C. Keys 3428-0065 The operator controls movement of the shift fork by means of the gear selection control and cable. Note: There are no shift detents in or on the transmission on 1988 and newer mowers. 4-4 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 69
    transmission removal on the Toro Vacu Power/Lawn-Boy Medallion mower is quite easy and is recommended for most self-propel system repairs. 1. Remove the spark plug lead from the engine to prevent accidental starting. Drain the fuel and oil. 2. Place the ground speed selector in neutral. This
  • Toro 20330 | Service Manual - Page 70
    caps to housing (Fig. 120). Fig 121 3428-0120 2. Before disassembling further, check for proper operation of the input system, the gear reduction system and gear selection system. For more information on this, refer to "OPERATION" on page 4-3. Fig 120 3428-0121 4-6 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 71
    THREE SPEED TRANSMISSION 3. Removal of or excessive drag and replace any parts necessary. If ball bearing replacement is required, press the ball bearing out using an arbor press. 7. If service of any of the output components with grease to ensure proper lubrication. WPM Drive Systems Manual 4-7
  • Toro 20330 | Service Manual - Page 72
    THREE SPEED TRANSMISSION Output Shaft Assembly 1. Slide the output bushing onto the output shaft, flanged side last. Assemble from the end of these components with a light coat of grease (Fig. 125). A. Shift key sleeve Fig 123 492-4733 fig. 4-1 Fig 125 3428-0066 4-8 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 73
    THREE SPEED TRANSMISSION 8. If the left pivot arm was removed for servicing, reassemble now as described under "Rear Heightof-Cut and Wheel Pinion Clutch - Assembly" on D. Pinion Fig. 100 Fig 127 3428-0059 A. Intermediate shaft B. Flange C. Shift fork retainer WPM Drive Systems Manual 4-9
  • Toro 20330 | Service Manual - Page 74
    THREE SPEED TRANSMISSION Intermediate Shaft Assembly Note: Before assembling, coat the intermediate shaft Spacers MVC-000 Installation For assembly, reverse the removal process. Torque the belt guide fasteners to 130 in-lbs. (15 Nm) (Fig. 129). 4-10 Fig 129 3428-0196 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 75
    SPEED TRANSMISSION Special Assembly Notes for Toro Vacu Power/Lawn-Boy Medallion 1. Slip the gear selection cable into the shift fork lever through the bottom as shown in Figure 130. 4. Slip the two rear end cap fasteners through the safety shield guide wires then install. Tighten all four end cap
  • Toro 20330 | Service Manual - Page 76
    SPEED TRANSMISSION TROUBLESHOOTING TIPS - 3 SPEED of the key or the notch in the gear may be the problem (Fig. 133). A B A. Shift collar Fig 133 B. force required to shift gears will increase. Check the cable for free movement where it enters the transmission. These are WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 77
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 5-1
  • Toro 20330 | Service Manual - Page 78
    WHEEL ASSEMBLY, ROCKING KEY STYLE 27 10 11 Ref. No. 1 2 3 4 5 6 7 8 8:2 8:3 8:4 9 10 11 12 Qty Description 1 V-Belt 1 Lever-Shift 1 Pin-Cotter 1 Clamp-Cable 2 Cap-End 2 O-Ring 2 Spring Arm ASM 2 Pivot Arm ASM 1 Bushing 1 Bushing 1 Fitting-Zerk 2 Washer-Arm, Pivot 4 Washer
  • Toro 20330 | Service Manual - Page 79
    shaft and drives the wheels. operator operator squeezes the handle to provide power to the wheels. 8. Pivot Arm Assembly - provides support for the output shaft with a bushing and a needle bearing. It can be rotated in the end cap to change part and is symmetrical so that it can be put on
  • Toro 20330 | Service Manual - Page 80
    wheel pinion clutch be maintained according to the instructions in the operator's manual, which is greasing every 25 hours with the mower, shut the engine off and push the mower forward a few inches. If the keys disengage the system is working correctly. Start the engine and engage the drive, if
  • Toro 20330 | Service Manual - Page 81
    arm and spring arm assembly • End cap (if desired) 4. Check all components , and the wheel pinion clutch components. Replace parts as necessary. 5. Check the innermost groove externally tabbed thrust washer. 2. Press the oil impregnated bushing into the boss on the pivot Drive Systems Manual 5-5
  • Toro 20330 | Service Manual - Page 82
    washer Fig 138 C. Key D. Spring arm 3428-0028 5. To increase service life, make sure all parts are clean prior to assembly and coated with new grease. 6. If 0028) above. Not all models use an O-ring. 7. Slip the end cap onto the output shaft, but do not fasten at this time. 8. Drive Systems Manual
  • Toro 20330 | Service Manual - Page 83
    arm using the nylon locknut. 17. Grease with No. 2 lithium-based grease. Use a hand grease gun to avoid excess pressure that may prevent the friction parts from working. As a rule, use two pumps to ensure that you do not over-grease. Be sure to grease after every 25 hours of use
  • Toro 20330 | Service Manual - Page 84
    HOC 2 Bearing-Ball 5-8 Ref. No. 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Fig 141 3354-613(5) Qty Description 2 Spring-Compression 2 Key Fwd 2 Screw-HWH 1 Spacer 1 V-Belt 2 Pulley-Half, Front 1 Washer-Flat 1 Nut-Lock 1 Cover-Belt, Front 1 Washer WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 85
    wheel drive models. 1. Raise the mower until the wheel is off the ground. Support with a block. 2. Remove the wheel bolt, wheel and wheel cover (Fig. 142). Servicing the System The things that can impede the function are dirt, rust or wear. The owner's manual requires that ordinary engine oil be
  • Toro 20330 | Service Manual - Page 86
    thrust washer and retaining ring (Fig. 000). (MVC-850) Fig 145 MVC-472 2. Lubricate with anti-seize and assemble in the original order. 5-10 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 87
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 6-1
  • Toro 20330 | Service Manual - Page 88
    to the BBC cable adjustment section for proper adjustments. BBC Clutch Operation The clutch operates by using a flywheel which turns with the engine crankshaft and a brake drum and blade that are free to turn separately from the flywheel. The two are connected by tensioning a drive belt between the
  • Toro 20330 | Service Manual - Page 89
    releasing the control bar, the operator can regulate the ground speed of self-propel models without disengaging the blade. Fig 149 fig. 28 a. Left Control Housing: serves as the cover for the BBC control mechanism. It also houses the end of traction and BBC cables. b. Control Bar: pivots on upper
  • Toro 20330 | Service Manual - Page 90
    this position, it is the buckling spring that supports it. Notice that the buckling spring is not flexed and is at the left end of the slot in the rocker arm. A D B C A. Control hook B. BBC cable lever Fig 150 3428-0278 C. Traction cable lever D. Buckling spring 6-4 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 91
    handle, the BBC cable has been tightened enough to engage the blade (Fig. 152). A A B B C A. Rocker arm B. BBC cable lever Fig 151 cable lever. Continuing to raise the control bar causes the traction lever to move and the traction cable engages the transmission. WPM Drive Systems Manual 6-5
  • Toro 20330 | Service Manual - Page 92
    sure to use one of the two methods below to retain them. The first and quickest method is to manually hold the ends of the cable and the end of the buckling spring while operating the control bar. However, with the right case half removed, the leaf spring is no longer in place
  • Toro 20330 | Service Manual - Page 93
    rocker arm assembly. 10. Press the roll pin from the rocker arm and remove the control hook and torsion spring. 11. Remove the traction cable from the traction lever and the left-hand control housing. A. Leaf spring B. Traction lever Fig 155 C. Traction cable fig 34 WPM Drive Systems Manual 6-7
  • Toro 20330 | Service Manual - Page 94
    through the control bar, traction lever, and left cable into the cable lever (Fig. 157). Note: The BBC cable lever is behind the spring. Fig 156 A. Control hook B. Roll pin flush with this side C. Cable lever fig 35 A. BBC cable lever Fig 157 B. BBC cable fig 36 6-8 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 95
    control and install the throttle control. 14. Adjust the BBC cable and traction cables as needed. See page 7-16. 9. Assemble the right control housing by installing the leaf spring and pin to retain the leaf spring (Fig. 159). A A. Leaf spring Fig 159 MVC-488 WPM Drive Systems Manual 6-9
  • Toro 20330 | Service Manual - Page 96
    BBC / BOS / BCS TORO BBC SERVICE GUIDE Disassembly Sequence 6-10 Fig 160 bbc scan WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 97
    Spring 1 Flange Bushing 1 Lever Wa 1 Bushing 1 Ring Seal 1 HWH Screw 5 TAP Screw 1 Flange Nut 1 Cable Bracket Support 2 Flat Washer 1 Bellcrank Bushing 1 Crank 1 Spring Pin 1 Control Link WPM Drive Systems Manual Ref. No. 22 23 24 25 26 27 28 31 32 33 34 35 36 37 38 39 42
  • Toro 20330 | Service Manual - Page 98
    System Disassembly (Toro Vacu Power/Lawn-Boy Medallion) cable bracket. Once loose, remove the bellcrank assembly complete with control link from the unit (Fig. 165). B Fig 163 A 3428-0079 A. Control link B. Shoulder bolt C Fig 165 C. Bellcrank 3428-0090 6-12 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 99
    replace as necessary. Bellcrank System Assembly (Toro Vacu Power/Lawn-Boy Medallion) 1. Insert the control pin into the recessed area on the bellcrank. D B C A. Brake plate lever B. Control link C. Shoulder bolt Fig 167 3428-0088 D. Bellcrank E. Cable bracket support Drive Systems Manual 6-13
  • Toro 20330 | Service Manual - Page 100
    airflow underneath the deck thereby improving quality of cut and bagging performance. Be sure to clean the screen on occasion, especially if quality of cut or bagging performance has degraded. A. BBC flywheel B. Brake drum Fig 168 MVC-000 C. Bearing block D. Screen 6-14 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 101
    BBC / BOS / BCS Under Deck Components Disassembly (Toro Vacu Power/Lawn-Boy Medallion) 1. Stop the engine and disconnect the spark plug lead to prevent accidental starting. Drain fuel. 2. Remove the 2 flanged nylon locknuts securing the blade to the bearing block and remove the anti-scalp cup, the
  • Toro 20330 | Service Manual - Page 102
    air wrench on the brake lever self-tapping screw as thread damage to the housing may result. 11. Remove the brake plate and hub assembly from the housing and disassemble the seal/oil (28mm) socket. 14. Inspect all parts for damage and/or wear and replace as necessary. 6-16 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 103
    BOS / BCS Under Deck Components Assembly (Toro Vacu Power/Lawn-Boy Medallion) 1. Check to make sure an idler hub into each side of the idler pulley bearing, then slip the belt onto the idler pulley. Slip the entire assembly between the brake plate and . (11.33 Nm) WPM Drive Systems Manual 6-17
  • Toro 20330 | Service Manual - Page 104
    the crankshaft (Fig. 176). This can result in noisy operation, premature belt wear, and belt jumping. Fig 177 MVC-726 CAUTION! As with disassembly, anged head selftapping screws. A 10. Install the BBC screen, the blade spacer, the blade, and the anti-scalp cup onto the BBC screw and secure
  • Toro 20330 | Service Manual - Page 105
    BBC / BOS / BCS 11. Complete BBC service by checking BBC and selfpropel controls, making sure that all are functioning normally. Adjust as necessary. BBC Cable Removal (Toro Vacu Power/ Lawn-Boy Medallion) 1. Remove the two flanged head self-tapping screws securing the screen panel to the housing
  • Toro 20330 | Service Manual - Page 106
    on the upper carriage bolt. A. Plastic fitting B. Cable fitting Fig 181 C. Spring fig 68 6. Before installing the screen panel, adjust the BBC cable as described under "BBC Cable Adjustment (Toro Vacu Power/Lawn-Boy Medallion Models)", which follows. See page 7-15. 6-20 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 107
    Engine 1 Gas Cap ASM 1 Toro Nameplate 1 Recoil Decal 1 Clamp Screw 1 Casing Clamp 3 HWH Screw 1 Belt Guide Bracket 1 Woodruff Key 1 Pulley 1 Flywheel 2 Blade Bolt 1 Brake Drum ASM 2 Vibration Dampener 1 Hub ASM 1 Shield 1 Blade Spacer 1 Blade Nut 1 Recycler Blade
  • Toro 20330 | Service Manual - Page 108
    Idler Arm System Disassembly (Recycler/ Rear Bagger) 1. Drain the fuel and oil. Remove the spark plug wire. Disassembly for the idler arm begins on top of the mower housing. Fig 184 3428- Fig. 187). 6-22 B C A A. Spring B. Screwdriver Fig 185 C. Wire loop 3428-0177-2 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 109
    mower on its side. Remove the blade and the BBC cover. Brush any grass removed, the idler arm can pivot away from the brake drum and the belt can be removed. BBC / BOS / BCS Slide the lever off the on. If they are to be replaced, press them out at this time (Fig. 189). A Fig 187
  • Toro 20330 | Service Manual - Page 110
    broken out or the bumps on the pulley are damaged, the pulley must be replaced. Usually this is caused by an error in assembly. Refer to "Idler Arm System Assembly (Recycler/Rear Bagger)" on page 6-25 for instructions to avoid this. Fig 190 3428-0187 A 7. Remove the hub assembly and brake drum
  • Toro 20330 | Service Manual - Page 111
    BCS Idler Arm System Assembly (Recycler/Rear Bagger) 1. Start by installing the key and self-propel pulley. The two bumps on the pulley should face you (Fig. 193). Slip the belt over the pulley. The fl the brake drum (Fig. 195). A WPM Drive Systems Manual A. Foam pad Fig 195 3428-0188 6-25
  • Toro 20330 | Service Manual - Page 112
    blade Start the nut on the crankshaft. As during disassembly, an impact wrench works best. Fig 197 3428-0187 6. Slip the BBC belt over the parts on the crankshaft. 7. Check the shaft of the idler/brake arm. Clean as necessary and apply a light coat of grease. 6-26 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 113
    shown. B C A. Idler/brake arm Fig 198 3428-0190 A 9. Start the shaft into the hole in the housing. Rotate the idler/brake arm Cable Removal (Recycler/Rear Bagger) 1. Loosen the cable clamp and pull cable out from under the screw (Fig. 201). Fig 199 3428-0192 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 114
    cable fig 36 BBC Cable Installation (Recycler/Rear Bagger) 1. Slide a new BBC cable into the BBC cable lever. Install the end of the cable sheath in recess provided in the left control housing half. 2. Before installing the right control housing half, make sure that the traction Drive Systems Manual
  • Toro 20330 | Service Manual - Page 115
    , including the steps necessary to replace the blade drive and self-propel belts. 1. Drain the fuel and oil and tip the mower on its side. We recommend carburetor side up to prevent any oil or gasoline from draining into the air filter and causing hard starting. 2. Remove the two locknuts securing
  • Toro 20330 | Service Manual - Page 116
    a second wrench to hold the bolt head (Fig. 209). Fig 207 MVC-198 Fig 209 MVC-200 5. Remove the 3 capscrews and lift off the belt cover (Fig. 208). 7. Unhook both springs from the slot in the brake arm (Fig. 210). Fig 208 MVC-199 Fig 210 MVC-203 6-30 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 117
    brake assembly and blade drive belt from the mower (Fig. 211). 10. The components of the idler assembly are shown here (Fig. 213). B A F E C D G H Fig 211 MVC-205 9. To replace the blade drive belt, remove the idler pulley bolt (Fig. 212). A. Belt B. Nut C. Brake arm D. Belt guard Fig 213
  • Toro 20330 | Service Manual - Page 118
    12. Rock the pulley half slightly and lift it off. The blade bolts will now drop out of their pockets (Fig. 215). crankshaft and this pulley half is also the drive pulley for the self-propel belt. Go to the transmission to continue replacing the self-propel belt (Fig. 216). 15. The anchor plate
  • Toro 20330 | Service Manual - Page 119
    Brake Arm Assembly 1. Place the spacer with the large diameter down on the brake arm (Fig. 220). Fig 221 MVC-213 3. Install the belt, belt guide, and carriage bolt on the brake arm and secure with the carriage bolt (Fig. 222). Fig 220 MVC-211 WPM Drive Systems Manual Fig 222 MVC-216 6-33
  • Toro 20330 | Service Manual - Page 120
    BBC / BOS / BCS BOS/BCS System Assembly Assemble all other parts in reverse order. Bolt torque as follows: Blade nuts: 350 - 400 in-lbs. (39.5 - 45.2 Nm) Crankshaft Bolt: 45 - 55 ft-lbs. (60.9 - 74.5 Nm) 6-34 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 121
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 7-1
  • Toro 20330 | Service Manual - Page 122
    and control assemblies on mowers not covered in other parts of this manual. This section will cover disassembly and repair of those types. Toro 2 Bail Handle The engine stop cable is not adjustable. If it fails to function, it must be replaced. The self propel cable is adjustable through a clamp
  • Toro 20330 | Service Manual - Page 123
    original Toro Personal Pace/ Lawn Boy Easy Stride system. The handle is telescoping and as it slides, it tensions the transmission drive belt. 1. Squeeze the ends of the control bail to disengage it from the handle. Disconnect the cable from the bail and set aside (Fig. 226). Operation The best
  • Toro 20330 | Service Manual - Page 124
    the traction lever (Fig. 230). Fig 228 DSC-4810 Fig 230 DSC-4815 4. Remove the traction rod retainer. Note the location of the traction control rod (Fig. 229). 6. Unhook the springs from each side of the handle (Fig. 231). Fig 229 DSC-4811 Fig 231 DSC-4814 7-4 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 125
    need to replace the traction control rod or either of the springs, one of the handle guides will need to be removed. The guides are held traction control rod. The springs apply pressure to the handle to hold it in the retracted, upper position (Fig. 235). Fig 233 DSC-4821a WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 126
    tightens the self propelled belt and drives the transmission. Handle Removal To ease removal of the Personal Pace handle from a 22" Recycler, make a tool 2 Fig 238 MVC-712 1. Disconnect the control cables and the key switch (electric start models) from the upper handle and Personal Pace handle
  • Toro 20330 | Service Manual - Page 127
    CABLES 2. Install the tool over the stop in the handle guides as shown, one on each side. Push the handle down. The tool will allow the handle to slide over the stop built into the handle guide (Fig. 242). A Fig 240 A. Traction Control Bar MVC-707a WPM Drive Systems Manual Fig 242 MVC-710 7-7
  • Toro 20330 | Service Manual - Page 128
    bail is the self propel bail. Squeeze it to tension the belt and drive the transmission. Fig 243 DSC-4829 Fig 244 3428-0049 The engine stop cable is not adjustable. If it does not function, it must be replaced. The self propel cable is adjustable through a clamp. It should be adjusted so that
  • Toro 20330 | Service Manual - Page 129
    stop control on zone start models and the blade control on blade clutch models. On a zone start model, pull the top bail down and hold to keep the engine running. The Sens-a-Speed handle telescopes and as it is depressed tensions the transmission drive belt. To operate this keep your elbows at
  • Toro 20330 | Service Manual - Page 130
    clean the top slides and the sleeves before assembling. Dirt and grit in the sliding part of the handle can cause a bind. Assemble in reverse order. When you install the Remove the shoulder bolt and the traction lever (Fig. 248). Fig 248 DSC-4880a Fig 249 DSC-4885a 7-10 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 131
    downward to remove all the slack (Fig. 250) then push the cable jacket up 1/8" (3.17cm) (Fig. 251) and secure with the cable clamp. 1. Cable clamp Fig 251 2. Cable G002634 1. Cable Fig 250 Handle Disassembly, Lawn-Boy Blade Clutch System (BCS) Models G002635 1. Remove the upper wire bail. On
  • Toro 20330 | Service Manual - Page 132
    handle upwards (Fig. 255). A. E-clip Fig 253 DSC-4896a 3. Slide the pivot assembly, bail and the brake cable to the right until the bail slides off the pin (Fig. 254). B A C A. Traction lever B. Pivot assembly Fig 254 C. Top slide DSC-4899a 7-12 Fig 255 DSC-4907a WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 133
    Fig 257 3428-0196 3 Speed Transmission Models Handles on 3 speed models are basic and easily disassembled. The traction control cable tilts the transmission backward to tighten the belt and engage the transmission (Fig. 258). It must tighten sufficiently to fully drive the transmission, yet allow
  • Toro 20330 | Service Manual - Page 134
    without releasing the bail (Fig. 261). 1" (25mm) A A. Clamp Fig 259 3428-0043-2 Fig 261 fig 20 To adjust, turn the knob or loosen the cable clamp and slide the cable jacket up or down. Secure with the clamp. Fig 260 A. Blade brake cable B. Jam nuts fig 69 7-14 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 135
    Cable Adjustment (Toro Vacu Power/ Lawn-Boy Medallion) 1. Remove the two flanged head self-tapping screws securing the screen panel to the housing and remove the screen panel (Fig. 262). 2. With the engine off and the spark plug wire disconnected, cock and lift the control bar to engage the blade
  • Toro 20330 | Service Manual - Page 136
    can be varied to accommodate a customer with small hands, etc. Toro BBC Cable Adjustment (Recycler/Rear Bagger) The cable adjustment is the clamp on top of the housing on the left side of the mower. Loosen the screw holding the cable clamp. Pull the cable to the rear just enough to remove the slack
  • Toro 20330 | Service Manual - Page 137
    On BBC models, the control bail also controls the transmission belt engagement. The adjustment point is a knob about halfway between the control panel and transmission. Ideally, the cable should be set so that the transmission drive will disengage when the bail is lowered about 1" (25mm). This
  • Toro 20330 | Service Manual - Page 138
    HANDLES AND CONTROL CABLES Toro BOS Control Cable Adjustment Lawn-Boy BCS Control Cable Adjustment The blade clutch control is adjusted by removing the cover between the engine and bag door. Loosen the cable clamp and draw the cable to the rear to remove the slack. Now push the cable outer jacket
  • Toro 20330 | Service Manual - Page 139
    AND CONTROL CABLES Lawn-Boy Insight Platimun: 1. Remove the gas and oil and tip the mower on its side with the air filter up. 2. Remove the BCS cover and belt cover. 3. Loosen the 2 cap-screws securing the bracket to the housing. Pull the cable to the rear to remove the slack. Push the cable forward
  • Toro 20330 | Service Manual - Page 140
    HANDLES AND CONTROL CABLES THIS PAGE INTENTIONALLY LEFT BLANK. 7-20 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 141
    Gear Transmission 3 Single Speed Bevel Gear Transmission 4 Three Speed Transmission 5 Wheel Pinion Clutch 6 Blade Brake Clutch Systems (BBC), Blade Override System (BOS), Blade Clutch Systems (BCS 7 Handles and Control Cables 8 Self-Propel Belt Replacement WPM Drive Systems Manual 8-1
  • Toro 20330 | Service Manual - Page 142
    and oil from the engine. Remove the belt cover, just behind the engine on top of the mower, to access the transmission. Loosen or remove the belt guides so the belt can be replaced without forcing. See the section on the three speed transmission starting on page 4-1. 8-2 WPM Drive Systems Manual
  • Toro 20330 | Service Manual - Page 143
    -PROPEL BELT REPLACEMENT 21" Toro and Lawn-Boy Mowers with Blade Brake Clutch Part of the blade clutch must be disassembled to access the self propel belt. See the BBC section starting on page 6-1 for more information. 21" Toro Mowers with Blade Override System and Lawn-Boy Mower with Blade Clutch
  • Toro 20330 | Service Manual - Page 144
    SELF-PROPEL BELT REPLACEMENT THIS PAGE INTENTIONALLY LEFT BLANK. 8-4 WPM Drive Systems Manual
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WALK BEHIND POWER
MOWER DRIVE SYSTEMS
SERVICE MANUAL