L20696 Power Steering Troubleshooting Guide 6-11

L20696 Power Steering Troubleshooting Guide 6-11
Power Steering Pumps & Gears
(troubleshooting & installation tips)
Keep Your System Clean!
We recommend when replacing a power steering pump or gear
• Inspect all hoses and fittings • Flush and replace fluid • Change filter
Symptom
Potential Causes
Solution
Oil leaking from gear box output
shaft
Damaged shaft seal
Replace seal and shaft if necessary
Fluid is leaking out of reservoir or
foaming
Clogged oil filter
Change fluid and filter
Air in system
Bleed system, inspect suction side
of supply pump for air leak
Poppetts of steering gear not
adjusted properly causing high
temperatures
Adjust poppetts
Pump cavitating
Inspect pump supply line for
restriction
Fluid overheating
Inspect steering gear return line for
restriction
Hard turning in one or both
directions
Bind in steering column
Inspect column drag
Dirt or debris trapped in piston relief
Inspect piston relief
Bent or damaged king pins and tie
rods
Repair or replace king pins and
tie rods
Front end load too great
Lighten load
Low fluid level in steering system
Fill reservoir as needed
Air in system
Bleed system and inspect for cause
Steering radius restricted
Poppetts not adjusted properly
Adjust poppetts
Hard steering
Defective supply pump
Inspect pump flow
Steering out of alignment
Align front end
Fluid overheating
Find and correct overheating cause
High operating temperature
Fluid flow restriction
Inspect back pressure
Check maximum oil flow
Road wander/over steering
L20696 US 6/11 5M CM
Oil flow too high
Pump not to specifications
Air trapped in gear
Bleed system
Looseness worn front end parts
Inspect and repair as required
Front end alignment not correct
Align front end
Overloaded
Reduce loads
Rear axle not parallel
Inspect and repair as needed
Tight tie rod ends and drag link
sockets
Inspect rotational torque and
replace as needed
Initial Poppets / Plunger Setting Procedure
Note: This procedure is for new and remanufactured gears from Haldex or your vehicle manufacturer. All steering gears
from Haldex have had their poppett/plunger seats replaced and reset.
Caution: System must be flushed prior to installing new gear. This will ensure any debris or foreign matter that is in system
does not damage your new gear.
•
•
•
•
•
•
Inspect axle stop bolts to ensure they are set to vehicle manufacturer’s wheel cut or clearance specifications.
Jack up front end so tires are off the ground.
Start engine and let it die.
Turn steering wheel to full left until you contact axle stop; pull hard on the steering wheel.
Turn steering wheel to full right until you contact axle stops; pull hard on the steering wheel.
Turn vehicle off.
Flushing Instructions - Pump
When replacing PUMP only:
•
•
•
•
•
•
Lift front axle off the ground and support with axle stands. Be sure and block rear tires.
Install pump. Do not reconnect return hose from gear to reservoir. Place hose into a five gallon container. Use a
plug on reservoir to contain fluid.
Select proper fluid as recommended for steering gear or linkage system. Note: A good rule of thumb is to use
twice the amount of fluid as the capacity of the entire system.
When possible, disconnect the ignition so the engine won’t start. An assistant is required to crank over the
engine and to rotate steering wheel at the same time. Caution: Avoid hitting or holding against axle stop
or damage will occur. At the same time fill reservoir with fluid and make attempt at not letting the pump run
dry. This can be difficult at best. This allows the valve to open and the piston to force clean fluid through the
pressure hose, valve, piston area and out of the return hose into five gallon container. Flush until clean fluid
comes out.
Now re-attach return line to reservoir, top off reservoir, re-connect ignition system start engine and move wheel
to one side. Stop engine and re-inspect fluid. Caution: Do not over fill!
Start engine and turn steering wheel stop to stop approximately 6 times. Let run until system at running temp and
repeat turning steering wheel stop to stop six times. Caution: Do not hold against axle stops. Note: Many steering
systems use a manual bleed procedure. Determine gear type to see if it has a manual bleed screw to remove residual
air from the system.
Flushing Instructions - Gear Box
When replacing GEAR only:
•
•
•
•
•
•
•
•
Lift front axle off the ground and support with axle stands. Be sure and block rear tires.
Install gear. Do not reconnect pressure and return hoses from gear to reservoir. Place hose into five gallon
container. Use plug on reservoir to contain fluid.
Select proper fluid as recommended for steering gear or linkage system. Note: A good rule of thumb is to use
twice the amount of fluid as the capacity of entire system.
When possible, disconnect the ignition so the engine won’t start. An assistant is required to crank over the
engine and to rotate steering wheel at same time. Caution: Avoid hitting or holding against axle stop or
damage will occur. At the same time fill reservoir with fluid and make attempt at not letting the pump run dry.
This can be difficult at best. This will allow the valve to open and the piston to force clean fluid through the
pressure hose. Flush until clean fluid comes out.
Remove return hose from reservoir, clean with solvent and air blow dry. Reinstall.
After re-connecting hoses, fill reservoir and crank over engine 5 seconds. Now turn steering wheel stop to stop
without cranking engine. Top off reservoir.
Start engine and turn steering wheel stop to stop approximately 6 times. Let run until system at running temp and
repeat turning steering wheel stop to stop six times. Caution: Do not hold against axle stops. Note: Many steering
systems use a manual bleed procedure. Determine gear type to see if it has a manual bleed screw to remove residual
air from the system.
Lower to ground and inspect fluid level
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement