honda-automobiles mm60 User Manual

Read this complete section before starting any 
repair. Many steps are dependent on each other. 

1

. Gearbox bearings, gears and shafts have an 

interference press fit. Gearbox repair is limited 
to seal; gasket and vent plug replacement. 

2. Always maintain correct gear lube level in 

gearbox. Be sure proper vent plug is installed. 

3. 

Troubleshooting is an important part of gearbox 

maintenance. Check for leakage and bad 
bearings. 

4. Leakage is a very serious problem and must be 

corrected immediately or damage to gearbox 
and belt will result. Remove gearbox from 
mower to repair leakage problems. 

5. Leakage may be caused by a vent plug not 

venting. 

To check vent plug operation, remove 

plug and apply low air pressure 

to 

opening in 

side of plug. Check to make sure it is venting 
out 

of the top. 

6. 

Operating gearbox with improper lube level 

may 

also cause 

seals to leak. Also check for 

housing cracks. 

If any of these conditions exist, 

correct them, clean area where leakage was 
evident, return mower to service and check to 

make sure leakage has been stopped. 

7.

 Bearing maladjustment or failure is indicated by 

noise and excessive side and end play in gear 
shafts. 

If noted, replace the gearbox. 

1. Disconnect drive shaft and remove key. Re- 

move belt and remove gear stand from mower. 

2. Turn gear stand over. There are 

two set screws 

in the split taper bushing; remove them. Insert 
one set screw into the threaded bushing hole 
and tighten to force bushing and pulley apart. 

3. 

Remove gearbox from stand.