TM-9-2320-260-20

TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)

TECHNICAL MANUAL; UNIT MAINTENANCE

APRIL 1995

TM-9-2320-260-20 - Page 1057 of 1337

TM 9-2320-260-20

13-35. WRECKER HYDRAULIC PRESSURE TEST AND ADJUSTMENT

THIS TASK COVERS:

a. Testing

b. Adjustment

INITIAL SETUP

APPLICABLE MODELS

EQUIPMENT CONDITION

M816

●

Parking brake set (TM 9-2320-260-10).

REFERENCES (TM)

●

Boom fully retracted (TM 9-2320-260-10).

TM 9-2320-260-10

TM 9-2320-260-20P

1. Remove plug (6) from elbow (7).

2. Install hydraulic pressure gage fitting (5) on elbow (7).

3. Start engine (TM 9-2320-260-10).

4. Lower cable hook (1) enough to provide travel for pressure testing hydraulic system.

5. Hold boom crowd control lever (4) in retracted position and hoist control lever (3) in up position.

Record reading on hydraulic pressure gage (2).

6. Reading on hydraulic pressure gage (2) should be 1200 psi (8274 kpa). If reading is not 1200 psi

(8274 kpa), adjustment is required.

CAUTION

Never adjust relief valve without using pressure gage. Equipment

failure will occur.

1. Remove capnut (11) from relief valve (8) and loosen nut (9).

2. Turn setscrew (10) clockwise to increase hydraulic pressure, or counterclockwise to decrease

hydraulic pressure.

3. Hold setscrew (10) and tighten nut (9) on relief valve (8).

4. Install capnut (11) on relief valve (8).

5. Retest hydraulic pressure system.

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