TM 5-2420-231-23-1
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Table 1. Loader Clamshell Does Not Operate Correctly.
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MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Loader Clamshell Does Not
Test Step 1. Test Operation of Loader
Operate Correctly
Systems.
1. Ensure ride control switch (Figure
1, Item 1) is in off position (TM 5-
2420-231-10).
Figure 1. Ride Control Switch.
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2. Operate loader clamshell (TM 5-
Loader Clamshell Cylinders Operate
Slowly - Proceed to Test Step 2.
2420-231-10). Monitor and record
machine operation.
Loader Clamshell Will Not Operate -
Proceed to Test Step 4.
Test Step 2. Inspect Loader
Clamshell Cylinder Hydraulic Tubes
and Hoses.
1. Ensure hose connections are tight.
Start and run machine (TM 5-
2420-231-10).
2. Inspect left loader clamshell cylin-
Loader Clamshell Cylinder Hydraulic
der hydraulic hoses (Figure 2, Item
Hoses OK - Proceed to step 3.
8), and right loader clamshell cylin-
Loader Clamshell Cylinder Hydraulic
der hydraulic hoses (Figure 2, Item
Hoses, Leaking, Kinked or Damaged
2) (WP 0237) for kinks, damage,
- Replace loader clamshell cylinder
and Class III leaks between clam-
hydraulic hoses (WP 0237).
shell cylinders (Figure 2, Items 4
Proceed to Test Step 7.
and 7), and check valve (Figure 2,
Item 1).
3. Inspect loader clamshell cylinder
Loader Clamshell Cylinder Hydraulic
Hoses OK - Proceed to step 4.
hydraulic hoses (Figure 2, Item 3)
Loader Clamshell Cylinder Hydraulic
for kinks, damage, and Class III
Hoses Leaking, Kinked or Damaged
leaks between check valve (Figure
- Replace loader clamshell cylinder
2, Item 1), and quick-connect fit-
hydraulic hoses (WP 0237).
tings (Figure 2, Item 5).
Proceed to Test Step 7.
