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|Item:||Hydraulic Steering Unit||Model No.:||101, 102, 103, 109, BZZ, 060 Series|
|Displacement Range:||8 Cc - 1000 Cc||Check Valve:||Available|
|Safety Valve:||Available||Integrate Valve:||Available|
|Function:||ON, OR, CN, LS||Application:||Any Hydraulic Direction Control Systems|
hydraulic orbitrol steering unit,
1000 cc orbitrol steering unit,
ce orbitrol steering unit
Troubleshooting and solution of hydraulic steering unit
|Heavy turning of wheel.||1. Insufficient oil pressure or no oil
pressure at all.
a. Pump not operating.
b. Pump defective.
C. Incorrect pump rotation.
d. Pump worn.
2. Relief valve sticking when open or
the valve pressure is too low.
3. Blocked LS orifice or dirt particles
delaying spool movement in flow
4. Very high implement system
pressures acting on EF port.
5. Misplaced anti-cavitation ball in
a. Make the pump operate.
b. Repair or replace the pump.
C. Alter direction of pump rotation.
d. Replace the pump.
2. Repair, clean and reset the relief
3. Remove and clean the whole system.
Change all filter elements.
4. Contact your dealer for help under
these special circumstances.
5. Dismantle steering unit and reposition
or replace anti-cavitation ball.
|"Motoring" - steering
wheel turning by itself.
|1. Leaf springs have sagged and thus
have reduced elasticity or no
elasticity at all (broken springs or
2. Squeezed spool/sleeve. Possible
insufficient spool/sleeve clearance.
1. Replace leaf springs in control unit.
|Repeated steering wheel
Impossible to make
steering go to neutral
position. Steering to left
or right on own accord.
|1. Leaf springs without elasticity or
2. Steering column out of alignment
with steering unit.
3. Insufficient clearance between
steering column and coupling.
|1. Replace leaf springs in control unit.
2. Align steering column with steering
3. Adjust the clearance.
|Backlash.||1. Splines of cardan shaft worn or
2. Leaf springs without elasticity or
|1. Replace cardan shaft.
Replace leaf springs in steering unit.
|Shimmy - abnormal
vibration of steering (tire
pattern can cause
|1. Air accumulation in steering
2. Worn mechanical connections and
3. Leaky dual shock valves and
suction valves or broken springs.
|1. Bleed the cylinders and find the source
of the air accumulation and have it
2. Replace worn parts.
3. Repair or replace dual shock valves,
suction valves or the springs.
|The steering wheel can
be turned continuously
without turning the
|1. No oil in the tank.
Steering cylinder piston seals
Shock valve failure.
|1. Fill system with clean oil and bleed the
2. Repair or replace cylinder(s).
3. Remove shock valves and repair or
replace, then reset pressure level.
|The operator cannot feel
resistance when the
steered wheels turn to
|1. Shock valves are set to
approximately the same setting as
2. Dirt particles causing shock valve
|1. Adjust shock valve settings to at least
500 psi (34 bar) higher than steering
Clean system and fill with clean oil.
|Heavy impacts in
steering wheel in both
Incorrect setting of cardan shaft
and gear wheel setting (timing).
|1. Adjust setting (timing).|
|Kickback from system.||1.
Dirt particles delaying spool
movement in flow amplifier.
|Remove and overhaul flow amplifier.
Sample test oil to determine
contamination source. Clean system,
change filter elements and fill with
|Slow steering.||1. Insufficient oil to the steering unit
due to defective or worn pump.
Weak or damaged priority valve
spool bias spring.
Replace the pump. .
Check or replace spring.
|The steering wheel does
not pass to neutral
position - tendency to
|1. Dirt particles between spool and
2. Squeezing between spool and
sleeve caused by a too-high systen
3. Leaf spring broken or without
4. Mechanical binding in steering
|1. Clean spool and sleeve, or replace
steering unit. Clean entire system.
2. Adjust pump pressure to the correct
value at steering PRV.
3. Replace with new springs.
4. Correct and adjust where necessary.
|When turning the
steering wheel, the
steered wheels are
activated in the opposite
|1. The hydraulic hoses to the steering
cylinders have been reversed.
Incorrect mounting and setting of
cardan shaft and gear wheel set.
|1. Correctly connect the hoses.
Correct the setting.
|Steering power too low
(possibly to one side
|. 1. . Pump pressure too low.
Malfunctioning shock valve.
|1. Correct the pump pressure or adjust
the steering PRV in the flow amplifier
Remove and repair or replace shock
|Leakage at input shaft,
end cover on gear wheel
|1. Defective shaft seal.
2. Screws have come loose.
Defective discs or 0-rings.
|1. Replace shaft seal.
Tighten the screws to 266 in-lb (3 N-
Replace discs or O-rings.
Contact Person: Alyssa Lee