Specifications

66
Transaxle Troubleshooting
In-Line Shift Models (i.e. 800, 820, 915,
920, 930, MST)
Transaxle troubleshooting can be a mystery to many
technicians, but by using a common sense approach
that most technicians use for engine troubleshooting, the
mystery will disappear and be replaced with confidence,
skill and eventually, mastery of transaxle service.
Before you begin to take off the wheels (the hardest part
of transaxle repair) check the associated equipment.
A. Check belts for proper adjustment.
B. Check for proper adjustment of brake, clutch, shifter
and related linkages, etc.
C. Check pulleys for sheared keys and proper belt
disengagement.
D. Check for proper shifting by removing drive belt. If
transaxle does not shift freely it would indicate an
internal transaxle problem.
After you have made all preliminary checks it may now
become necessary to remove the transaxle from the
equipment.
The first area to check after removing the transaxle
cover is the shifting keys. The keys are the safety link
to protect against serious gear damage. Check keys for
breaks, cracks, stress marks, worn shift key ends and
proper spring tension (diag. 122).
Check input bevel gears for excessive wear. If gears
are damaged, the cover should be checked for distortion
(diag. 123).
To properly troubleshoot and inspect the transaxle
further, it is necessary to clean grease from parts during
disassembly.
During disassembly check shifting gears and washers
for proper assembly.
Check countershaft splines and splines on inner
diameter of countershaft gears (diag. 124).
Check reverse sprockets for damaged teeth and if
applicable, inner diameter spline area. Check chain for
damage or excessive stretching.
Check differential ring gear and bevel gears for
excessive wear. Bevel gears should be replaced as a
set if any gear is damaged. When replacing snap rings,
put flat side of snap ring against the thrust side of gear.
Do not over stretch the snap rings when removing and
installing (diag. 125).
Check axles and as applicable, axle bearings or
transaxle case/cover for wear or damage.
122
123
124
125
ROUNDED OR CHIPPED
CHIPPED
CHIPPED
CHIPPED
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