Toro 20330 Service Manual - Page 25

Assembly - oil

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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 and any metal shavings from the case. 13. Worm and helical gears are sold as a set. Even after a short run time, they will develop a wear pattern. Replacing only one gear will result in rapid failure (Fig. 014). A 14. Remove the screw from the shift arm and remove the shift arm, dust cover, and wear plate (Fig. 015). If the ball bearing is to be replaced, press it out at this time. G A. Roll Pin B. Latch Plate C. Dust Filter D. Dust Cover A B C D E F Fig 015 E. Shift Arm F. Screw G. Shift Rod 3428-0165 A. Worm Shaft B 15. Remove the roll pin and pull shifter rod out of the cover. Clean the cover. Fig 014 3428-0157 B. Helical Gear Assembly 1. Use bushing installation tool P/N 27-0460, to press in new axle bushings. This tool helps keep the bushing straight and keeps the inner diameter of the bushing correctly sized. WPM Drive Systems Manual 1-7

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1-7
WPM Drive Systems Manual
Assembly
Fig 014
3428-0157
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 and any metal shavings from
the case.
13. Worm and helical gears are sold as a set. Even after
a short run time, they will develop a wear pattern.
Replacing only one gear will result in rapid failure
(Fig. 014).
14. Remove the screw from the shift arm and remove
the shift arm, dust cover, and wear plate (Fig. 015). If
the ball bearing is to be replaced, press it out at this
time.
Fig 015
3428-0165
15. Remove the roll pin and pull shifter rod out of the
cover. Clean the cover.
WORM DRIVE TRANSMISSION
1.
Use bushing installation tool P/N 27-0460, to press
in new axle bushings. This tool helps keep the
bushing straight and keeps the inner diameter of the
bushing correctly sized.
A. Worm Shaft
B. Helical Gear
A. Roll Pin
E. Shift Arm
B. Latch Plate
F.
Screw
C. Dust Filter
G. Shift Rod
D. Dust Cover
A
B
G
B
C
D
E
F
A