Service Manual
HTG Series Integrated Hydrostatic Transmission
6
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA
HY13-1524-002-M1/US
General Information
Troubleshooting Checklist
(page 1 of 3)
General Cautions
Caution: Do not pressure wash the transmission to remove debris. Use a power blower to remove built up debris.
Caution: Use of Foam/ Liquid filled tires is not recommended. Filling the tires will void the transmission warranty.
Problem/ Symptom
What to Check/ Look For/ Look At
Potential Repair Fix
Dealer Fix
If In Warranty
Replace
Transmission
Fluid Leakage
Expansion tank overfilled
Refer to OEM owners manual- Remove fluid
and adjust to proper level
X
NOTE: Identify fluid leak
location
Expansion tank overflowing (tank com-
pletely filled when transmission is run)
Check for broken fan blades, debris build
up, contaminated oil/ milky oil
X
NOTE: Refer to owners manual
for proper transmission fluid
and fill volume.
Shaft seal leaking (Trunnion, Input, Motor
Output Seal)
Replace shaft seal
X
Filter cap- Check proper torque, inspect
for seal damage, inspect for cap damage
If loose, torque to proper torque specifica-
tion, if seal damage replace filter assem-
bly, if cap cracked replace filter assembly
X
Static seals leaking (Side/ bottom cover) Remove covers, install new seal, re-torque
to proper torque spec
X
Motor static seals leaking (motor section
seals, motor top housing interface seals)
Dis-assemble transmission, remove pump
section from motor, replace seals as
necessary
X
Drain plug is leaking
Torque to proper spec. If leak continues,
remove drain plug, install new plug and
washer, torque to proper spec, refill oil
X
SAE plug/ hose barb
Check torque of fitting, if leak continues
replace fitting assembly
X
No Power
Proper fluid level
Refer to OEM owners manual- Check trans-
mission fluid level, adjust as necessary
X
NOTE: Verify Engine is run-
ning / operating properly
Bypass lever position
Ensure lever is in the proper operating
position
X
NOTE: Refer to owners manual
for proper transmission fluid
and fill volume.
Drive belt broken or lack of proper tension Inspect belt and tensioner pulley and
spring, repair as necessary
X
Trunnion lever/ control linkage discon-
nected/ damaged
Inspect linkage and repair as necessary
X
Internal components of transmission are
damaged
Remove transmission, dis-assemble,
repair/ replace as necessary
X
