HONDA MM60 - Manual (Page 50)

MAINTENANCE
GEARBOX MAINTENANCE
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.
Removing Gearbox from Mower
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.
Seal
Seal
Vent
gasket
Gear Box
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