HYDRAULICS
8O-52
3. Set the parking brake, start engine, and advance
engine speed to full throttle position.
4. Record the pressure gauge reading. The charge
pressure should be 54 to 66 psi (372 to 455 kPa).
Conclusion
• If charge pressure is within range, charge relief
setting is correct. Proceed with Steering Circuit Test.
• If charge is not within range the charge relief valve
may need cleaning or replacement.
5. Shut down engine and remove ignition key.
Relief Valve
NOTE:
The charge relief valve (Figure 8O-2) cannot be
repaired or adjusted. Replace if damaged or
faulty.
6. Remove charge relief valve plug, spring, and
cone. Inspect for sediment or debris and damage.
Clean or replace as necessary. If the relief valve is
not clogged or damaged:
• Charge pump is faulty
• Traction circuit has excessive internal leakage.
Figure 8O-2. Charge Pressure Test
Steering Unit Inlet
Relief Valve
0 to 200 psi (0 to
1379 kPa) Gauge
Tee
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