TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
Step 5.
Refer to the lubrication order (LO 9-23220-280-12) and
lubricate the steering linkage and check it for damage. Replace any
damaged components.
Step 6.
Check the power steering system using the power steering
analyzer and analyzer adapter.
(a) Disconnect the high pressure hose from the hydro-boost
leading to the power steering pump and connect the analyzer to the
hydro-boost and the high pressure hose.
Open the valve on the
analyzer.
(b) Disconnect the harness connector at the fan drive solenoid.
Check the fluid level in the power steering pump, and add fluid if
necessary.
(c) Connect the simplified test equipment/internal combustion
engine (STE/ICE) for the purpose of recording the engine rpm in 8.
(d) Start the engine and allow it to idle.
Check for leaks at
connections.
(e) Record the pump pressure and flow. The pressure should be
140-170 psi and the flow should be 2.5-2.75 gallons per minute (gpm).
If the pressure and flow is too low, check for restrictions in the
pressure line from the power steering pump. If the pressure is too
high, check for a restriction in the pressure line from the hydro-
boost to the steering gear.
If no restrictions are found, replace
the power steering pump following the procedures contained in
paragraph 8-18, page 8-42 of the TM.
(f) Partially close the valve on the analyzer so that the
pressure increases to 200 psi and record the flow.
Subtract this
flow rate from the flow rate recorded in 5. If there is more than 1
gpm difference in flow rates, replace the power steering pump.
To
replace the power steering pump, follow the procedures contained in
paragraph 8-18, page 8-42 of the TM.
CAUTION
Do not leave the valve fully closed for more than
five seconds or pump damage will result.
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