Toro 20330 Service Manual - Page 80
Test for Function, Quick Test, Rear Height-of-Cut and Wheel Pinion Clutch, Disassembly
UPC - 021038203300
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WHEEL PINION CLUTCH 17. Compression Spring - provides the light, constant, inward force necessary for proper clutch washer and friction ring engagement. It is extremely important that the wheel pinion clutch be maintained according to the instructions in the operator's manual, which is greasing every 25 hours with one or two pumps of grease. Greasing regularly will prevent contaminants from damaging or wearing the system. Note: Over-greasing will also cause the system to malfunction. To operate this system, practice the following. Walk along at a normal pace. When you stop walking, keep your elbows at your sides. The mower will continue forward for a few inches due to its momentum. As the mower rolls away, the drive will disengage as the personal pace/ easy stride handle extends and disengages the transmission. From the point where the transmission is no longer turning the axle, the mower must roll about 1-1/2" forward. This causes the pinions to rock the drive keys to the disengage position. At this time the mower can be pulled backward with minimal effort. When the drive is engaged and the axle begins to turn the keys should re-engage. Test for Function Function The rocking keys provide a differential action by engaging and disengaging each drive wheel individually. When the drive is engaged and the axle begins to turn, friction between the friction ring and clutch washer cause them to rotate the tail on the key. This results in the main part of the key engaging the teeth on the inside of the pinion gear. Should one or both wheels turn faster than the axle, the pinion rotates and pushes the key back down into the groove. The pinion can now roll freely over the key. When turning the inside wheel will drive the mower. The outside wheel must turn faster and overrides the key. When the mower is straightened out the pinion is no longer turning faster than the axle so the key re-engages the pinion. Quick Test If you are unsure that the keys are disengaging properly, stop 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 both engage they are ok. If one or the other do not engage or disengage properly try greasing the pivot arm. Use #2 lithium grease and only one or two pumps from a hand grease gun. If grease does not help disassembly is necessary. Rear Height-of-Cut and Wheel Pinion Clutch - Disassembly The rear height-of-cut system and the wheel pinion clutch can be serviced with the transmission in or out of the unit. For information on removing the transmission from the unit, see Transmission - Removal, page 2-3, 4-5 or 4-6 depending on mower type. 1. Remove the shoulder bolt securing the wheel and tire assembly to the pivot arm and remove the wheel and tire assembly complete with shoulder bolt, spacers, wheel cover, and nylon locknut. 5-4 WPM Drive Systems Manual