H E A D A S S E M B L Y O F W H E E L B R A KE

CONTROL VALVE FOR EMERGENCY AND PARKING BRAKE

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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TM 5-3805-258-24-1 A I R S Y S T E M A N D B R A K E S 3. Leakage around seals (4) and (5) in the wheel brake head assembly. This leakage can be caused by incorrect installation or a cut or damaged seal. H E A D A S S E M B L Y O F W H E E L B R A KE 4. Seal. 5. Seal. Test Use the tests that follow to find the cause for brake fluid leakage. 1. 2. For large amounts of brake fluid leakage, in- spect all hoses, tubes and fittings in the brake system for an indication of leakage. If any leakage is found, it must be corrected before going to the next step. Check the brake fluid level in the reservoirs. Measure the distance from top edge (6) to the fluid level. The correct distance is 13 mm (.5 in.). If the reservoir is too full, remove fluid until it is at the correct level. If the fluid level is too low, add fluid until it is at the correct level. Install the diaphragm and cover on the reservoir. CAUTION Use only DOT 3 brake fluid. C H E C K O F B R A K E F L U I D L E V E L I N R E S E R V O IR 6. Top edge of reservoir. 7. Reservoir for rear axle (rear w h e e l b r a k e s ) . 8 . R e s e r v o i r f o r f r o n t a x l e ( f r o n t w h e e l b r a k e s ) . 3. 4. TESTING AND ADJUSTING Put a clean metal oil pan under the master cylinders to catch brake fluid drops from the master cylinders. Start the engine and let the air pressure and oil temperature go up to normal pressure and temperature for operation. Keep the engine in operation during this procedure to make sure of correct air pressure. Make 100 complete brake applications and releases. Stop (pause) ten seconds between applications. NOTE: Do not move the machine for this test. 5. 6. Check the brake fluid level in the reservoirs again. If a loss of brake fluid can be measured, check the oil pan for drops of brake fluid. Make a comparison of the amount of fluid in the oil pan with the amount of fluid loss from the reservoir. If the amounts of fluid are ap- proximately the same, the problem is in the master cylinder. If the amounts are different, go to the next step. If brake fluid loss from the reservoir is more than the leakage from the master cylinder, the probable location of the leakage is at seals (4) and (5) in the wheel brake head assembly. The leakage can be from either or both wheel brakes on the axle. To find the location of the leakage (if only one brake is leaking), do the procedure that follows: NOTE: Reservoir (7) is for the rear axle (rear wheel brakes). Reservoir (8) is for the front axle (front wheel brakes). a. Find which axle has the problem (leakage). b. On this axle, disconnect tube (9) from the head assembly on one of the wheel brakes. c. R I G H T F R O N T W H E E L B R A K E 9. Tube. Connect a 9S7692 Inverted Flare Connector to the fitting on tube (9). Install a 1/8 in. pipe plug in the connector. One wheel brake 4-62

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