Group 25, Steering Column and Gear
25-4-2 • Stering System Relief Pressure Check and Adjustment SM 765, Dec ’06
2. Clean the port opening and connect the pressure
gauge (also cleaned) to the gauge port on the main
pump.
3. Start the engine and let it warm up until it runs
smoothly.
4. Check steering system relief pressure setting at full
throttle. Accelerate engine to full throttle and hold at
this speed while taking the pressure readings.
IMP
RTANT
Do not operate system over relief any longer
than required to read the pressure gauge.
Prolonged time at relief pressure can result in
a damaged pump and valve.
5. Turn the steering handwheel in one direction until
steering cylinder reaches its stop (relief bypass).
Hold steering handwheel in relief position until pres-
sure reading is taken, and then release. Turn off
engine. Pressure should read between 10000 kPa
(1450 psi).
6. To adjust the steering pressure relief to 10000 kPa
(1450 psi).
a. Carefully remove the core plug of the steering
pressure relief valve on the main pump by prying
the plug out.
b. Clockwise adjustment of the relief valve seat
raises the pressure setting at which the valve
relieves pressure ; counterclockwise adjustments
lowers the pressure setting at which the valve
relieves pressure.
7. Restart engine and repeat steps to read and adjust the
relief pressure setting until correct relief pressure is
set.
• Once you adjust to the correct relief pressure set-
ting, reset the core plug in the valve bore.
• If the correct relief pressure cannot be gained, con-
sider overhauling or replacing both the priority
valve and the pressure relief valve. See Group 29,
“Hydraulic Pump Overhaul” for instruction to
remove, overhaul, and replace the valves on the
pump.
8. Disconnect the pressure gauge and close the engine
compartment.
To increase
To decrease
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