Table 4-4. Unit Troubleshooting. - Continued
TM 5-5420-209-12
Malfunction
Test or Inspection
Corrective Action
11.
BAY DOES NOT OPEN PROPERLY - Continued
Step 2.
Check cable adjustment.
Adjust cables.
12.
RAMP DOES NOT ACTIVATE WHEN PUMP HANDLE IS PUMPED
Step 1.
Check position of control and vent valves.
Position valves correctly.
Step 2.
Inspect reservoir for proper oil level.
Service reservoir.
Step 3.
Check for crimped, ruptured, pinched or hydraulic lines.
Replace damaged lines and tighten loose fittings.
Step 4.
Test cylinder and pump for internal damage.
a.
Disconnect line at lower end of cylinder, operate pump in PUMP mode, and check for oil
flow.
b.
If no oil flow is present, replace pump.
c.
If oil flow is present, reconnect lower line, disconnect upper line, and operate pump again.
d.
If oil flow is present, and cylinder extends, replace pump.
e.
If no oil flows from the cylinder, cylinder is defective.
13.
BAY LOWER LOCK DRIVE SCREW DOES NOT MOVE FREELY
WARNING
Dry cleaning solvent, PD-680, used to clean parts is potentiality dangerous to personnel and property.
Avoid repeated and prolonged skin contact. Do not use near open flame or excessive heat. Flash point
of solvent is 100-138‘F (39-59 °C).
Step 1.
Check drive screw for freedom of movement and binding.
Apply grease per MIL-G-21164 to screw threads.
Step 2.
Check condition of threads and adjustment of lower lock drive.
Replace damaged lower lock drive.
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