Specifications
55
Transaxle Troubleshooting
95
96
97
98
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. 95).
Check input bevel gears for excessive wear. If gears
are damaged, the cover should be checked for
distortion (diag. 96).
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. 97).
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. 98).
Check axles and as applicable, axle bearings or
transaxle case/cover for wear or damage.