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 TM 55-1905-217-12
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check setting of overcenter valve.
Reset overcenter valve (para 4-80).
Step 3. Check setting of counterbalance valves (Gunderson, Craft, and Rohr).
Reset counterbalance valves (para 4-81).
2. STEERING IS SLOW
Step 1. Inspect flow control valve.
Disassemble and clean valve. Repair or replace (para 4-81).
3. KICK BACK IN HELM
Step 1. Check for air in system.
Bleed air from system. Correct air leak and refill (para 4-82).
Step 2. Check for restriction in lines.
Clean lines (para 4-82).
Step 3. Check for air in system, low oil level.
Bleed air from system. Correct air leak and refill (para 4-82).
Step 4. Check overcenter valve or counterbalance.
Adjust or replace valve (para 4-80 or para 4-81).
4. WHEEL TURNS BUT RUDDER DOES NOT
Step 1. Check for ruptured line.
Replace ruptured line (para 4-82).
Step 2. Check for air in system.
Bleed air from system' Correct air leaks and refill (para 4-82).
5. NOISY OPERATION OF PUMPS
Step 1. Check for air in system
Bleed air from system. Correct air leak and refill (para 4-81).
6. OIL TOO HOT
Step 1. Check action of flow control valve.
Disassemble, inspect, and clean or replace valve (para 4-80 or para 4-81).
7. OVERFLOWING OF TANK
Step 1. Check for aeration of oil by air leaks in system.
Shut down system, allow air to escape. Repair air leak (para 4-81).
8. LOSS OF OIL
Step 1. Check for ruptured line
Repair ruptured line (para 4-81).
RAMP HOIST HYDRAULIC SYSTEM
1. CONTROL VALVE LEVER DOES NOT MOVE
Step 1. Check control valve.
Replace control valve (para 4-89).
2. CONTROL VALVE LEVER MOVES BUT WINCH DOES NOT TURN WHEN CABLE IS FREE TO MOVE
Step 1. Check hydraulic oil or system pressure.
Check quantity of oil in supply tank. Replenish if necessary (para 449).
Step 2. Check for ruptured hydraulic line.
Replace line (para 4-89).
Step 3. Check system relief valve to see if it is set at correct pressure (para 4-89).
Check system pressure. Adjust relief valve if required (para 4-89 or 4-90).
Step 4. Check foreign material in system.
Flush system completely and clean filter and strainer (para 4-87).
Step 5. Check counterbalance valve to see if it is correctly adjusted (hull numbers 8500 thru 8519 and 8540
thru 8560 and 8580 thru 8618).
Adjust counterbalance valve (para 4-96).
3. BRAKE DOES NOT RELEASE
Step 1. Check insufficient operating pressure.
If pressure is adequate (300 psi for hull numbers 8500 thru 8519, or 2,100 psi for hull num-
bers 8540 thru 8560 and 8580 .thru 8518), check counterbalance valve setting (hull num-
bers 8500 thru 8519, and 8540 thru 8560 and 8580 thru 8618 (para 4-96).
Step 2. Check for foreign material in system.
Flush system completely and clean strainer and filter (para 4-86).
4-12
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