DIFFERENTIAL LOCK PEDAL ADJUSTMENT

TM-5-3805-260-24 Scraper Tractor: Elevating Self-Propelled 11 Cubic Yard Sectionalized and Nonsectionalized Manual
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TM 5-3805-260-24 DIFFERENTIAL LOCK PEDAL ADJUSTMENT PEDAL ADJUSTMENT 1. Differential lock pedal. A. Distance .75 In. (19.00 mm). B. Valve stem movement .16 F .03 In. (4.1 i 0.8 mm). 1. Adjust the bolt on the bottom of pedal (I) so there is a distance (A) of approximately .75 in. (19.0 mm) between the bottom of the bolt head and the bottom of the shoulder on the pedals. 2. With the pedal pushed down, adjust the bolt to permit a valve stem movement (B) of. 16 + .03 in. (4.1 + 0.8 mm). BRAKE CONTROL VALVE (LEAKAGE CHECK) Start the engine and let the air pressure go up. Push down on the brake pedal and hold it down. Put soap suds on the air line connections at the air chambers and check for air leakage. Release the brake pedal. Put soap suds on the exhaust passage of the brake control valve. Leakage must not be more than 1.00 in. (25.4 mm) soap bubble in one minute. Correct any air leaks. BRAKE ADJUSTMENT Caliper disc hydraulic brakes need no adjustment. There is no return mechanism to force the pads away from the discs. The pads are in slight contact all the time with the discs to keep them clean. AIR IN THE HYDRAULIC BRAKE SYSTEM TRACTOR AIR CHAMBER AND MASTER CYLINDER 1. Air line. 2. Master cylinder. 3. Valve. 4. Oil line to tractor brakes. 5. Air chamber. 6. Stroke indicator. SCRAPER AIR CHAMBER AND MASTER CYLINDER 7. Master cylinder. 8. Air chamber. 9. Air line. 10. Oil line to scraper brakes. A1. Valve. 12. Stroke Indicator. 13. Quick release valve. Air in the hydraulic brake system cannot be detected by brake pedal "feel." However, a stroke indicator on each master cylinder will provide a means of detecting a "soft" pedal condition which will cause increased master cylinder piston movement. If the movement of stroke indicators (6) and (12) is too much, check for hydraulic leaks or air in the system. NOTE: If the leak results from a damaged cup or seal, the hydraulic brake system may be contaminated. Drain the brake fluid and flush the system with denatured alcohol. the system is free of leaks, check for air. Bleed each hydraulic brakes .system. See the topic, AIR REMOVAL FROM BRAKES (Bleeding the Brakes). 2-152

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