Service Manual
HTG Series Integrated Hydrostatic Transmission
5
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA
HY13-1524-002-M1/US
General Information
NOTE
Before troubleshooting any system problem, check
service literature published by the equipment and/or
component manufacturers. Follow their instructions, if
given, for checking any component other than the HTG
Transmission.
Preparation
Make your troubleshooting easier by preparing
as follows:
• work in a clean, well-lighted place;
• have proper tools and materials nearby;
• have an air pressure source
SINCE SOLVENTS ARE FLAMMABLE, BE
EXTREMELY CAREFUL WHEN USING ANY
SOLVENT, EVEN A SMALL EXPLOSION OR FIRE
COULD CAUSE INJURY OR DEATH.
WEAR EYE PROTECTION AND BE SURE TO
COMPLY WITH OSHA AND OTHER MAXIMUM
AIR PRESSURE REQUIREMENTS. KEEP HANDS
CLEAR OF FAN AND MOVING PARTS CAN CAUSE
PERSONAL INJURY. SHUT OFF ENGINE AND LET
ENTIRE SYSTEM COOL BEFORE REMOVING ANY
COMPONENT.
Preliminary Checks
Hydraulic systems are often trouble-free. Hence, the
problem an operator complains of could be caused by
something other than the hydraulic components. Thus,
once you have determined that a problem exists, start
with the easy-to-check items, such as:
• parts damaged from impact that were not properly
repaired, or that should have been replaced
• improper replacement parts used in previous ser-
vicing
• mechanical linkage problems such as binding, bro-
ken, or loose parts or slipping belts
Hydraulic Components
If you think the problem is caused by a hydraulic
component, start by checking the easy-to-reach items.
Check all belts for cracks, hardening, or other signs of
wear. Check all pulleys, fans and bolts to make sure
they are tightened to specified torque value. Look for
leaks, especially at the coupling shaft and plugs.
Visually check other components to see if they are
loosely mounted, show signs of leaks, or other dam-
age or wear.
Suspect Faulty Transmission
Before the HTG Transmission is disassembled for re-
pair, make sure all control arm adjustments and engine
speed requirements are per OEM specification. Also
make sure the parking brake is releasing fully on both
sides.
If there is a defect in the HTG Transmission, a right
to left side performance difference should be notice-
able. To test for this condition, run the vehicle at full
forward throttle and control levers. The vehicle should
track nearly straight both on flat ground and on uphill
grades.
WARNING
WARNING
Troubleshooting Guide
