TM 5-2420-231-23-1
0066
Table 1. Loader Clamshell Does Not Operate Correctly - Continued.
066
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Loader Clamshell Does Not
Test Step 5. Test and Adjust Loader
Operate Correctly -
Relief Valve.
Continued
1. Perform loader relief valve pres-
Loader Relief Valve Pressure Within
sure check (WP 0086).
Specification of 3,000 to 3,200 psi -
Proceed to Test Step 6.
Loader Relief Valve Pressure Not
Within Specification - Proceed to
step 2.
2. Adjust loader relief valve to specifi- Loader Relief Valve Adjusts to
cation of 3,000 to 3,200 psi (WP
Specification of 3,000 to 3,200 psi -
Disconnect pressure gauge and hose.
Proceed to Test Step 7.
Loader Relief Valve Will Not Adjust
to Specification or Loader Relief
Valve Opening Pressure Is Less
Than 2,600 psi (17,926 kPa) -
Disconnect pressure gauge and hose.
Replace loader control valve assembly
(WP 0261).
Proceed to Test Step 7.
Test Step 6. Test Loader Control
Valve Leakage.
Perform loader test (WP 0086).
While Attempting to Open and Close
Loader Clamshell, Flow Low and
Remains Low (Less Than 1 gpm) -
Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace loader control valve assembly
(WP 0261).
Proceed to Test Step 7.
While Attempting to Open and Close
Loader Clamshell, Initial Flow High
Then Goes Low (Less Than 1 gpm) -
Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace both loader clamshell cylinders
(WP 0271).
Proceed to Test Step 7.
Test Step 7. Verify That Symptom Is
Resolved.
Operate loader clamshell (TM 5-2420-
Loader Clamshell Cylinders Operate
231-10) and observe operation.
Normally - Troubleshooting complete.
Loader Clamshell Cylinders Operate
Slowly - Repeat troubleshooting from
the beginning.
Loader Clamshell Will Not Operate -
Repeat troubleshooting from the
beginning.
END OF WORK PACKAGE
0066-7/(8 blank)
