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/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual | Next
TRANSFER CASE |
TM 9-2320-289-34
Table 2-1. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
45. POWER STEERING SYSTEM DOES NOT OPERATE PROPERLY
NOTE
Use suitable container to catch hydraulic fluid.
Step 1.
Disconnect power steering pump-to-power steering gear line at power steering
gear. Install power steering system analyzer with valve on power steering gear
side. Open valve. Start engine and run at idle. Check for leaks at fittings.
Tighten any leaking fittings.
Step 2.
Bleed power steering system. (See TM 9-2320-289-20)
Step 3.
Start engine and run at idle. Record flow rate and pressure.
If pressure is over 150 psi (1034 kPa), perform step 4.
If pressure is 150 psi (1034 kPa) or less, perform step 5.
Step 4.
Shut off engine. Check for restrictions in power steering lines. Disconnect power
steering pump-to-power steering gear line at power steering gear. Inspect check
valve for free operation. (See paragraph 8-4)
Clear any restrictions. Reposition or replace check valve if not operating
freely.
Step 5.
Partially close system analyzer valve to build pressure up to 700 psi (4827 kPa).
Subtract current flow rate from flow rate in step 3.
If flow rate has dropped 1 gal. (3.785 1) per minute or more, repair power
steering pump. (See paragraph 8-5)
If flow rate has dropped less than 1 gal. (3.785 1) per minute, perform
step 8.
CAUTION
DO NOT leave system analyzer valve fully closed for more than 5 seconds.
Failure to follow this caution may result in damage to power steering
pump.
Step 6.
Close and partially open system analyzer valve three times. Note highest pressure
each time valve is closed. All three readings must be 1350-1450 psi
(9308-9998 kPa).
If all readings are within specifications, perform step 7.
If any reading is not within specifications, replace power steering pump
control valve. (See paragraph 8-5)
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