Clark TW20-40 Tri Wheel Overhaul Manual (OH334)

These Clark TW20-40 tri-wheel trucks spend their lives shuttling pallets in tight warehouse aisles and loading docks, so when a pump or drive motor fails, you can’t afford guesswork. This overhaul manual is what you use when you’re past simple checks and you’re ready to strip the pump or motor down, inspect every wear surface, and build it back up so it runs like it should. If you’ve got a drive motor that’s lost torque or a steer pump that’s whining and running hot, this book guides you through a controlled teardown and reassembly instead of trial and error.

Applications & Use Cases

Plan a full overhaul of pump and drive motors before teardown—tools, seals, and components you’ll need on the bench.
Trace internal wear patterns to decide what can be reused and what needs replacement during a major rebuild.
Verify alignment and fit of shafts, bearings, and housings before final sealing and installation.
Route and reconnect hydraulic lines correctly after motor or pump replacement to prevent cross-porting or binding.
Test and confirm operation after overhaul so the truck returns to service without leaks, noise, or loss of power.

FAQ

Q: Is this manual useful if I’m only replacing seals?

A: Yes, it helps you open the unit correctly, inspect components, and reassemble without damaging new seals.

Q: Can I use a printed copy in the shop?

A: Absolutely; most techs print the needed pages, put them in plastic sleeves, and keep them next to the truck during the job.

Safety Note

Always depressurize the hydraulic system and secure the truck against movement before opening any pump or motor assembly.

Clark TW20-40 Tri Wheel Index:

PUMP MOTOR OVERHAUL
DRIVE MOTOR OVERHAUL
MAIN PUMP MOTOR OVERHAUL
STEER PUMP MOTOR OVERHAUL
STEER PUMP MOTOR OVERHAUL
PUMP MOTOR OVERHAUL
HYDRAULIC PUMP MOTOR OVERHAUL
200 AMP CONTACTOR OVERHAUL
100 AMP CONTACTOR OVERHAUL
STEER PUMP CONTACTOR OVERHAUL
G.E. ELECTRICAL CONTACTOR OVERHAUL
G.E. ELECTRICAL CONTACTOR OVERHAUL
SCR CONTROL PANEL OVERHAUL
G.E. SCR PANEL OVERHAUL
DRIVE AXLE UNIT OVERHAUL
BRAKE MASTER CYLINDER OVERHAUL
WHEEL BRAKE OVERHAUL
WHEEL CYLINDER OVERHAUL
WHEEL BRAKE OVERHAUL
CHAR-LYNN POWER STEERING GEAR OVERHAUL
STEERING GEAR OVERHAUL
STEER PUMP OVERHAUL
POWER STEERING PUMP OVERHAUL
POWER STEERING CYLINDER OVERHAUL
HYDRAULIC PUMP OVERHAUL
RACINE SV-20 PUMP OVERHAUL
CESSNA “H” SERIES GEAR PUMP OVERHAUL
LIFT PUMP OVERHAUL
HYDRAULIC VALVE OVERHAUL
TILT CYLINDER OVERHAUL
TILT CYLINDER OVERHAUL
UPRIGHT LIFT CYLINDER OVERHAUL
LUBRICATION SPECIFICATIONS