Fig. 24 Section View of Slack Adjuster

Fig. 23 Brake Chamber (Cross Sectional View)

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
Page Navigation
197

SERVICE MANUAL 7. Install lock nut (11), yoke (14), pin (13) and cotter pins (12). 8. Assemble yoke and lock nut to push rod. Test To check for leaks, coat brake chamber around clamp with soapsuds and apply air pressure to port in pressure plate (4). No leakage allowed. Preventive Maintenance Every month, or every 6,000 km (4,000 miles), brake chamber push rod travel should be checked. Push rod travel should be kept at a minimum without brakes dragging. Excessive travel of brake chamber push rod shortens the life of the diaphragm. Over travel also slows braking response. Once each year, or every 160,000 (100,000 miles), brake chamber should be disassembled and cleaned. New diaphragms must be installed. Be sure to use correct diaphragm return springs when reassembling chamber or uneven braking may result. Adjustment After brake chamber is installed, the brakes must be adjusted and checks made to be sure linkage does not bind. Adjustment of push rod length may be accomplished by altering the location of yoke. With brakes applied, the angle formed by the push rod and slack adjuster must be 90 degrees and all slack adjusters should be set at the same angle. With brakes applied, after being adjusted, this angle should still be no greater than 90 degrees. In other words, slack adjuster should not go "over center" when brakes are applied (Fig. 2). SLACK ADJUSTERS Slack adjusters provide a method of adjusting brakes to compensate for brake lining wear and also serve as a lever during braking operation (Fig. 24). Slack adjusters were designed to conform to the development of heavy duty, two-shoe foundation brakes. During brake operation, the entire slack adjuster rotates bodily with camshaft. When adjusting brakes, the worm moves the gear so as to change position of lever arms in relation to brake camshaft. Information pertaining to automatic slack adjusters will be found elsewhere in the BRAKE section of the Service Manual. Remove 1. Remove cotter key and clevis pin from slack adjuster and push rod clevis Fig. 24 Section View of Slack Adjuster 2. Remove snap ring from camshaft. 3. Slide slack adjuster from end of brake camshaft. Install Slack adjuster installation is the reverse procedure of removal. Be sure that the spacer washers are installed to provide a maximum end play of 1.59 mm (.062") with retaining ring installed. Two variations of snap ring grooves will be found; namely a 1.5875 mm (1/16") and 3.1750 (1/8"). The correct thickness of the retaining ring must be used when installing the slack adjuster. CTS-4080W - Page 17

Privacy Statement
Press Release
Contact