TM 5-3810-300-24&P2
1.
Indicates a delay in power application. (Can be caused by excessive free play in mechanical parts).
2.
Air in the oil (aeration) is the first thing to suspect.
3.
Loose joints or linkage connections.
4.
Lack of sufficient oil flow.
5.
Low oil supply.
"Jerks" or "Surges" in Steering Action.
1. Loose belt (slipping intermittently).
2. Insufficient oil flow.
Accompanied by Abnormal Noises (Growl).
1. Air in the circuit.
2. Mechanical trouble in pump.
3. Low oil supply.
Other Causes of Hard Steering.
1.
Valve spool sticking.
2.
Valve out of adjustment.
3.
Valve loose on mounting.
4.
Bind in power cylinder (bent rod, broken piston or piston rings).
5.
Lack of lubricant in valve actuator unit.
6.
Steering wheel tube bent or sprung.
7.
Bind in wheel tube bearing caused by tight clamp over bearing.
Hard Steering Remedies.
Belt Slippage.
1. Belt squeal is evidence of belt slippage.
2. Belt may be so loose that the pump output is very low.
3. Belt may be only semi-loose and only fails to turn pump when there is a heavy steering demand for hydraulic force.
(Belt and pump pulley can often be seen to stop momentarily, when someone steers).
4. A belt in good condition and properlt tensioned can be made to slip if the engine is accelerated rapidly while steering
pressure is maintained. This action very likely hastens belt stretching and glazing.
5. Belt glazing can cause slippage. An anti-glaze application may be helpful or slightly roughen pulley belt groove.
6. The remedy may be a replacement of the belt followed by regular checking of belt tension.
Lack of Sufficient Hydraulic Pressure.
Do not trust the pressure the pump is producing unless you check the pressure with a gage.
First make sure the oil supply in the reservoir is not low.
Install a pressure gage in the line from the pump to the control valve.
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