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 144 of 522

TM 9-2510-247-13&P

0028 00

UNIT TROUBLESHOOTING - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

3. CANNOT RELIEVE HYDRAULIC PRESSURE FROM ONE OR MORE LEVERS

Step 1.

Is hydraulic breather valve in CLOSED position (WP 0021)?

If no, go to step 2.

If yes, move breather valve to OPEN position (WP 0021).

Step 2.

Is return line obstructed (WP 0056 00-5 steps 3 thru 5)?

If no, replace breather valve (WP 0065).

If yes, clean or replace return line.

4. CYLINDERS DO NOT EXTEND OR RETRACT WHEN PUSH SWITCH ON ELECTRIC CONTROL

BOX AND LEVERS ARE ACTIVATED

Step 1.

Are hydraulic motors running and hydraulic pressure being maintained?

If no, check to see if there is voltage at push button switch and solenoid.

If yes, adjust hydraulic flow control valves (WP 0003).

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5. HYDRAULIC FLUID COMING FROM BREATHER VALVE

Step 1.

Is oil at correct level (WP 0056)?

If no, adjust oil level (WP 0056) and ensure breather valve on top of reservoir is

open at all times.

If yes, adjust hydraulic flow valves (WP 0003).

Step 2.

Is hydraulic pressure gauge showing pressure?

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

If yes, go to step 2.