TM-9-2510-247-13-P

FIFTH WHEEL TOWING DEVICE MODEL 250M

TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT MAINTENANCE MANUAL, REPAIR PARTS AND SPECIAL TOOLS LIST

JULY 2004

TM-9-2510-247-13-P - Page 143 of 522

TM 9-2510-247-13&P

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UNIT TROUBLESHOOTING - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM

1. HYDRAULIC FUNCTIONS SLOW OR INOPERATIVE

Step 1.

Is there minimum12VDC on batteries?

If no, go to step 2.

If yes, go to step 3.

Step 2.

Is NATO slave cable connected?

If no, install NATO cable in receptacle on prime mover and receptacle on 12/24

volt junction box.

If yes, go to step 3.

Step 3.

Is pressure gauge reading 300-800 psi when performing MAST RETRACT and

BOOM EXTEND functions during folding and unfolding (WP 0005 and WP 0021)?

If no, adjust flow control valves (WP 0003).

If yes, go to step 4.

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Step 4.

Is the temperature below 0°F (-18°C)?

If no, purge hydraulic oil (WP 0056 00-5) and fill with new hydraulic fluid.

If yes, purge hydraulic oil (WP 0056 00-5) and fill with 5606 Arctic oil (WP 0056 00-5).

2. BOOM HYDRAULIC CYLINDER LEAKS

Step 1.

Is pressure gauge reading 300-800psi when performing MAST RETRACT and

BOOM EXTEND functions during folding and unfolding (WP 0005 and WP 0021)?

If no, adjust flow control valves (WP 0003).

If yes, go to step 2.

Step 2.

Did adjusting the flow valves stop leak?

If no, replace hydraulic cylinder (WP 0064).

If yes, discontinue with troubleshooting.