18 Owner Service
MAN1192 (1/13/2017)
HYDROSTATIC TRANSMISSION SERVICE
NOTE: Hydrostatic system should require no servicing
or oil additions between regularly scheduled mainte-
nance. Opening expansion tank excessively may intro-
duce dirt and foreign particles shortening hydrostatic
life.
External Maintenance
Regular external maintenance of the transaxle should
include the following:
1. Check the vehicle operator's manual for the
recommended load ratings. Insure that the current
application does not exceed load rating.
2. Check oil level in accordance with "Fluid Change
Procedure," step 12, page 19.
3. Inspect the vehicle drive belt, idler pulley(s), and
idler spring(s). Insure that no belt slippage can
occur. Slippage can cause low input speed to the
transaxle.
4. Inspect the vehicle control linkage to the directional
control arm on the transaxle. Also insure that the
control arm is securely fastened to the trunnion
arm of the transaxle.
5. Inspect the bypass mechanism on the transaxle
and the vehicle linkage to insure that both actuate
and release fully.
Service and Maintenance Procedures
Some of the service procedures presented on the fol-
lowing pages can be performed while the transaxle is
mounted on the vehicle. Any repair procedures as
mentioned in the repair section of this manual must be
performed after the unit has been removed from the
vehicle.
Fluids
The fluids used in Hydro-Gear
®
products have been
carefully selected, and only equivalent, or better prod-
ucts should be substituted.
Typically, an engine oil with a minimum rating of 9.0 cSt
(55 SUS) at 230° F (110° C) and an API classification
of SL is recommended. A 20W50 engine oil has been
selected for use by the factory and is recommended for
normal operating procedures.
Fluid Volume and Level
Certain situations may require additional fluid to be
added or even replaced.
Purging will be required if oil has been changed. Refer
to the purging procedures on page 19.
Figure 6. Hydrostat Filter and Guard
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