Transmission - Assembly - Toro 20330 - Low Wheel Walk Power Mower Service Manual

Walk behind power mower drive systems

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Parts catalog (12 pages)

Operator's manual (33 pages)

Table Of Contents

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Table of Contents

3. Removal of the input shaft and pulley assembly can

be difﬁ cult because the input pinion has a tendency

to turn as the pulley nut is loosened. This situation

can be addressed by using an impact wrench or by

removing the 20 (B) and 25 (A) tooth gears (Fig.

122) from the intermediate shaft and then putting

the intermediate shaft assembly back onto the

transmission. The hexagonal intermediate shaft

can then be held with a 7/16" end wrench while the

pulley nut is loosened.

Note: A cut-away transmission cover can be

fabricated to hold the intermediate shaft in

place to facilitate pulley nut removal.

A. 25-tooth gear

4. Remove the intermediate shaft from the transmission

and clean. Inspect all gears for wear, cracks, and/or

broken teeth. Inspect the bushings for excessive

wear. Replace any parts necessary. Be careful not to

lose the two spacers that ﬁ t between the bevel gear

and the bushing.

WPM Drive Systems Manual

B B

Fig 122

3428-0058

B. 20-tooth gear

THREE SPEED TRANSMISSION

5. Remove the cotter pin from the top of the shift fork

and remove the shift lever.

6. Carefully pull the output shaft from the transmission

case, clean, and inspect all components for wear

or damage. Check the input shaft ball bearing for

roughness 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 shaft gears, or the

gear selection system, is required, remove the left

pivot arm as described under "Rear Height-of-Cut

and Wheel Pinion Clutch – Disassembly" on page

5-4 and 5-5.

Note: It is possible to replace the shift keys and

spring clip without removing the pivot arm

if the roll pin securing the gear sleeve to the

output shaft is ﬁ rst driven out. However, it

is not recommended since inspection of the

inside of the output gears is not possible.

8. Pull the output shaft bushing, the spacer, the shift

collar, the shift keys and spring clip, and the shift key

sleeve from the output shaft.

9. Remove the three output shaft gears form the output

shaft.

10. Drive out the roll pin securing the gear sleeve to the

output shaft. Remove the gear sleeve and remaining

output shaft bushing. Inspect all parts for wear and

damage and replace if necessary.