The following pages will assist you in answering questions you may have as you install your steering gear.
Filling and Bleeding System
Fluids
Poppet Adjustments
TAS Service Installation”
Filling and Bleeding System
The power steering system, by design, is self bleeding. However, in some installations where the gear is positioned at an old angle, or where the piston does not make a full stroke in the cylinder bore, air can be trapped in the steering gear. After re-installing the steering gear on the vehicle, but prior to connecting the drag link to the pitman arm, bleed the air from the system in the following manner.
- Check the power steering reservoir for the correct fluid level. Fill if necessary with he recommended power steering fluid. Leave reservoir cap OFF during the bleeding procedure.
- With the engine running, turn the steering wheel from full left to full right, make several complete cycles to remove the air from the steering system. Check steering fluid level as needed.
NOTICE: If fluid has air bubbles or foam, shut engine down and let sit for ten minutes and repeat step.
Fluids
The following are the fluids that should be used in each type of steering gear:
Ross HF
ATF “E” or “F”, ATF Dexron 2, Ford Spec. M2C138CJ
Mobile SAE 10W30,Mobile SAE 10W40, Ashland SAE 10W40
Shell Rotella T SAE 30, Union SAE 10W40, Texaco SAE 10W40
Ross HFB
ATF “E” or “F”, ATF Dexron 2, Ford Spec. M2C138CJ
Mobile SAE 10W30, Mobile SAE 10W40, Ashland SAE 10W40
Shell Rotella T SAE 30, Union SAE 10W40, Texaco SAE 10W40
Mack EO-K2 Engine Oil, Unical Gaurdol SAE 15W40, Unical Gaurdol SAE 30
Essolube SAE 15W40, Chevron SAE 10W40
Ross TAS
ATF “E” or “F”, ATF Dexron 2, Ford Spec. M2C138CJ
Mobile SAE 10W30, Mobile SAE 10W40, Ashland SAE 10W40
Shell Rotella T SAE 30, Union SAE 10W40, Texaco SAE 10W40
Mack EO-K2 Engine Oil, Unical Gaurdol SAE 15W40, Texaco TL-1833
Exxon Nuto H32, Chevron SAE 10W40
Poppet Adjustments
TRW/Ross and Sheppard
The relief valve plunger adjustment is provided to automatically reduce the steering pressure when the road wheels have reached the turn limits. This keeps the supply pump from operating at its maximum relief pressure and therefore reducing the steering system operating temperature stress loads
Adjustment Procedure
- Start engine and allow it to operate at idle speed.
- With full weight of the vehicle on all wheels, turn steering wheel in one direction until a high pressure hiss is heard or the axle stops contact.
- Adjust the relief valve plunger in or out until the high pressure hiss is heard when there is a clearance of 1/8 or 3/16 inches between the axle stops.
- Repeat this procedure at opposite axle stops.
Ross TAS Series
All TAS steering gears are equipped with self-adjusting poppets. These poppets are set once the unit is mounted on the vehicle.
Adjustment Procedure
- With the engine at idle, turn the steering wheel in one direction until the steering gear linkage contacts the axle stops. This will automatically position the poppet adjuster set and assembly.
- Repeat in opposite direction.
TAS Service Installation
WARNING: Automatic setting poppets do not bench test … do not rotate input shaft more than 1.5 revolutions unless gear is completely installed.
Bench rotating the input shaft more than 1.5 revolutions from center position when steering gear is not completely installed in he steering system could make the automatic poppets inoperative when the steering is installed. This would require disassembly of the steering gear to position poppet seat and sleeve assemblies.
NOTE: Poppets will automatically set when the steering gear is completely installed. As steering wheel is rotating full left or full right, poppets are set when axle stop contact is made.
Flush and bleed the power steering systems AFTER the gear is installed and all steering components are assembled.