DRIVE GP-FINAL 3530586 - Caterpillar

To prevent possible personal injury, do not disconnect any air lines until the air pressure in the system is zero.
1. Drain the air from the air reservoirs. The two tractor air reservoirs are located under the left front of the machine. The scraper air reservoir is located at the right rear of the machine. 2. Disconnect air hose assemblies (1) and (2) from the brake actuator. 3. Loosen adjusting screw (8). Loosen worm shaft (9) until pin (7) that holds yoke assembly (5) of the brake actuator to slack adjuster (6) can be removed.4. Remove the cotter pin and pin (7).5. Remove two nuts (4) and the washers that hold brake actuator (3) in position. Remove the brake actuator. The following steps are for the installation of the brake actuator.6. Position brake actuator (3) on the mounting bracket. Install the washers and nuts (4) that hold it. Tighten the nuts to a torque of 118 17 N m (87 13 lb ft).7. Connect air hose assemblies (1) and (2) to the brake actuator.8. Put slack adjuster (6) in position on yoke assembly (5) of the brake actuator. Install pin (7) and the cotter pin that holds it.9. Adjust the brakes. See the topic "Adjustment Of Brakes" in this module.Disassemble & Assemble Brake Actuators (Scraper)
Start By:a. remove brake actuators (scraper) 1. Remove yoke assembly (1), nut (19), dust boot (3) and boot retainer (4). Remove clamp assembly (12), pressure plate (11) and diaphragm (9).
There is spring force against flanged nut (2). When the flanged nut is loosened, the spring force will be released. To prevent possible personal injury, slowly remove flanged nut (2) until all of the pressure on the service brake spring is released.
2. Remove the locknut for flanged nut (2). Slowly remove flanged nut (2) to release the pressure on service brake spring (7). Remove rod (10), spring retainer (15), service brake spring (7) and the guide.
Spring (6) is under compression. When eight bolts (13) are removed, the spring force will be released. Do not use eight bolts (13) to release the compression on spring (6), use Tool (A). To remove spring (6) from the cylinder assembly, it must be compressed further to allow removal of eight bolts (13). To prevent possible personal injury, use Tool (A) properly to compress spring (6). After eight bolts (13) have been removed, slowly release the compressed spring with Tool (A).
3. Install Tool (A) on the brake actuator as shown. Slightly compress spring (6) with Tool (A). Remove eight bolts (13). Slowly loosen nut (22) [part of Tool (A)] to release the compression on spring (6).4. Remove Tool (A). Remove spring (6). Remove seal and wiper (17) from piston (5). 5. Remove wiper (23) and seal (24) from cylinder assembly (14). The following steps are for the assembly of the brake actuator.6. Check the condition of all parts of the brake actuator. If any of the parts are worn or damaged, use new parts for replacement.7. Install seal (24)