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Page Title:
Table 5-1. Direct Support and General Support Maintenance Troubleshooting -Continued |
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 TM 5-5420-205-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
CONTINUED
Step 4. Check pilot operated check valve (end bay).
Replace defective pilot operated check valve (para 4-15b).
Step 5. Check curbing hydraulic cylinders.
Replace defective cylinder (para 4-18).
8. SUPERSTRUCTURE WILL NOT ROTATE (SUPERSTRUCTURE MODEL NOS. 2195-1 AND 2195-2).
Step 1. Check continuity of switch S29.
Replace defective switch (TM 5-5420-204-34).
Step 2. Trace lead 652 to plug P63 and lea 652A to plug P118.
d
Tighten loose lead or connector.
Step 3. Test for continuity.
Repair or replace defective lead (TM 5-5420-204-34).
Step 4. Test solenoid L22 and L23 receptacle for continuity. Operate manual control on end of solenoid; if the
solenoid valve does not operate, it must be replaced.
Replace defective solenoid valve (TM 5-5420-204-341.
Step 5. Check flow control valve.
Replace defective valve 2639-5 or 2639-6 (TM 5-5420-204-34).
Step 6. Check double relief valve.
Replace defective valve 2327 (TM 5-5420-204-34).
Step 7. Check rotation cylinder.
Replace defective cylinder (para 4-19).
Step 8. Check quick-disconnect coupling.
Replace defective coupling (figs. 4-19(1) and 4-19(2)1.
9. SUPERSTRUCTURE WILL NOT ROTATE (SUPERSTRUCTURE MODEL NOS. 2271 AND 22721.
Step 1. Check flow regulation valves.
Repair or replace defective valve 8516 or 8517 (TM 5-5420-210-34).
Step 2. Check manual rotation valve.
Repair or replace valve 7105 (TM 5-5420-210-34).
Step 3. Check quick-disconnect couplings.
Replace defective coupling (figs. 4-19(1) and 4-19(2)).
Step 4. Check rotation cylinder.
Replace defective cylinder (para 4-19).
10. SUPERSTRUCTURE WILL NOT ELEVATE (SUPERSTRUCTURE MODEL NOS. 2195-1 AND 2195-21.
Step 1. Check continuity of switch S30.
Replace defective switch (TM 5-5420-204-34).
Step 2. Trace lead 650 to lead 606A, and trace lead 650A to plug P122.
Tighten loose lead or connector.
Step 3. Test for continuity.
Repair or replace defective lead (TM 5-5420-204-34).
Step 4. Test solenoid L20 and L21 receptacle for continuity. Operate manual control on end of solenoid; if the
solenoid valve does not operate, it must be replaced.
Replace defective solenoid valve (TM 5-5420-204-34).
Step 5. Check pilot-operated holding valve.
Replace defective valve 2640 (TM 5-5420-204-34).
Step 6. Check flow control valve.
Replace defective flow control valve 2639-4 (TM 5-5420-204-34).
Step 7. Check superstructure elevating cylinder.
Replace defective cylinder (TM 5-5420-204-34).
11. SUPERSTRUCTURE WILL NOT ELEVATE, (SUPERSTRUCTURE MODEL NOS. 2271 AND 22721.
Step 1. Check flow regulator valve.
Repair or replace valve 8613 (TM 5-5420-210-34).
Step 2. Check manual elevating valve.
Repair or replace defective valve 7103 (TM 5-5420-210-34).
Step 3. Check elevating cylinder.
Repair or replace cylinder 2880 (TM 5-5420-210-34).
5-3
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