Correction

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

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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A I R S Y S T E M A N D B R A K E S TM 5-3805-258-24-1 T E S T I N G A N D A D J U S T I N G has now been removed from the system so that the other wheel brake on the axle can be checked for leakage. d. Do Steps 2 through 5 again. If brake fluid loss from the reservoir is the same as before, there is no leakage in the brake that has been removed from the system (blocked). e. Do Steps 6b through 6d again for the other brake on the same axle. This gives added proof to the location of the problem. Correction After the location of the leakage is found, use the procedure that follows to correct brake problems. 1. For hose, tube or fitting leaks; tighten, repair or replace connections as needed. 2. If the leakage is in a master cylinder, replace seals (1), (2) and (3) of the master cylinder. It is also possible that some other defect, that can be easily seen, will need correction. Also, rippling (roughness) may be found in the bore of the master cylinder. This condition is not desired. Correct any damage or problem that can be easily found. 3. If the leakage is in a wheel brake head assem- bly, replace seals (4) and (5) of the head assem- bly, or replace the complete head assembly. REMOVE AIR FROM THE WHEEL BRAKE HYDRAULIC CIRCUIT (BLEED THE BRAKES) WARNING Make reference to WARNING on first page of AIR SYSTEM AND BRAKES TESTING AND AD- JUSTING section. Air must not be in the hydraulic circuit. Air in the system can prevent complete brake application and it is possible that the wheels on the machine can not be stopped. NOTE: Keep both brake fluid reservoirs full of brake fluid during the air removal procedure. B L E E D E R S C R E W S F O R T H E M A S T E R C Y L I N D E R S 1. Bleeder screws for the master cylinders. 1. Start the engine and let the air pressure go up to normal pressure for operation. Keep the engine in operation during this procedure to make sure of correct air pressure. 2. Push and hold the right brake pedal down. 3. Loosen (open) bleeder screws (1) on the master cylinders. 4. Tighten (close) bleeder screws (1) and release the right brake pedal. 5. Do Steps 2 thru 4 again until there is a constant flow of brake fluid (all of the air is removed) from each bleeder screw on the master cylinders. B L E E D E R S C R E W S F O R T H E W H E E L B R A K E 2. Bleeder screws. 6. Push and hold the right brake pedal down. NOTE: Bleed only one wheel at a time. 7. Open bleeder screws (2) at a wheel brake. 8. Close bleeder screws (2) and release the right brake pedal. 9. Do Steps 6 thru 8 again until there is a constant flow of brake fluid from bleeder screw (2). 10. Do Steps 6 thru 9 again at each wheel brake until all of the air is removed from the system. 4-63

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