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Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA
HY13-1524-002-M1/US
Option Disassembly and Assembly
Service Manual
HTG Series Integrated Hydrostatic Transmission
Warning Data
Before disassembly of the HTG Transmission or any of its components, read this entire manual. It provides im-
portant information on parts and procedures you will need to know to service the HTG Transmission unit. Be sure
that you know and understand the equipment and any hazards associated with performing these procedures.
Thoroughly clean off all outside dirt and grass, especially from around fittings and hose connections before dis-
connecting and removing the HTG Transmission. Remove belt connections and immediately plug port holes and
any fluid lines.
Depending on how the HTG is mounted to vehicle, the nut, brake hub and/or brake back plate may need to be
removed prior to removing the HTG for inspection and/or repair. Refer to exploded view illustrations for removal
and replacement of the brake assembly and torque specifications.
Remove the HTG Transmission from the chassis, drain it of fluid and take it to a clean work surface. Clean and
dry the exterior surfaces of the HTG Transmission before you start to disassemble it.
As you disassemble the HTG Transmission, clean all parts, except seals, in a clean container/tank, using a clean
OSHA approved solvent and use low pressure air to blow them dry.
WARNING
Be extremely careful when using any solvent. Even a small explosion or fire could cause injury or death.
WARNING
Wear eye protection and be sure to comply with OSHA or other maximum air pressure requirements.
WARNING
Never steam or high pressure wash hydraulic components. Do not force or abuse closely fitted parts.
WARNING
Do not tow, push, or pull faster than 5 mph. Towing may cause hydraulic transmission further damage. If
equipment needs to be moved, make sure both transmission bypass valves are open and push by hand.
Keep parts separate to avoid nicks and burrs.
Replace all seal rings and any damaged or worn parts with genuine Parker or OEM approved service parts.
