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How to trouble shooting Hydrostatic Steering System Designed for Large Vehicles

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How to trouble shooting Hydrostatic Steering System Designed for Large Vehicles
Latest company news about How to trouble shooting Hydrostatic Steering System Designed for Large Vehicles

Troubleshooting Chart



Today we are going to introduce how to Troubleshooting Hydrostatic Steering System


For a number of years produce and export hydrostatic steering unit, our hydrostatic steering unit (Hydraulic steering unit, hydrostatic steering, orbitrol steering valve, are terms for what we call orbitrol steering unit ) are designed for low speed vehicles to replace Danfoss, and more origional steering unit you may find on origional large equipment, such as forklifts, tractors, loaders, mowers, fishing boats, construction equipment, aircraft ground support vehicles, mining and earthmoving equipment.

These hydrostatic steering units allow vehicles to be steered without mechanical connections.
In built valve options such as relief valves, check valve, shock valves, plus load sensing circuits are available. Thus making a compact steering unit & reducing the need for additional hydraulic components in the system.


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



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Pub Time : 2019-12-16 11:32:38 >> News list
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