![]() Easy as 1-2-3īegin by locating the ASA’s grease fitting. ![]() Lubrication is a simple process that generally takes less than one minute per adjuster. The American Trucking Associations’ Technology & Maintenance Council’s (TMC) recommended practice (RP) for greasing ASAs lines up with those interval numbers mentioned earlier: Every six months, 1,800 operating hours, or 50,000 miles, whichever comes first. In addition to impeding performance, by impacting the brake stroke, this condition can put a vehicle out of compliance with stroke regulations. Neglecting this simple bit of maintenance leads to the grease inside an ASA becoming clay-like as it accumulates contaminants and loses its ability to lubricate the slack. ![]() It’s not uncommon for Bendix technicians to encounter automatic slack adjusters that haven’t been greased regularly. Both support vehicle safety by maintaining the correct brake stroke and providing optimal stopping performance.” Second, the action of forcing new lubricant into the ASA purges the old grease, along with any contaminants or water that have found their way in. “First, it protects the adjuster’s internal gear sets, clutches, and other components from premature wear. “There are two vital purposes to greasing an automatic slack adjuster,” said Keith McComsey, director of marketing and customer solutions, Wheel-End. This installment of the Bendix Tech Tips series reviews greasing automatic slack adjusters (ASAs), the importance of keeping up with their regular lubrication schedule, and other related wheel-end practices to enhance uptime and safety. Consider six months, 1,800 operating hours, or 50,000 miles – for many working trucks and truck drivers, those aren’t long intervals: But they’re key markers for a piece of basic wheel-end preventive maintenance that’s too often overlooked. This will help increase their longevity by reducing wear.Time and miles: Both seem to roll by more quickly Make sure that after application, repeat the greasing procedure after every 25,000 miles have been driven using the same slack adjusters. Right after installation and adjusting the angles, apply generous amounts of grease to the slack adjuster mechanism. It is recommended that slack adjusters be well lubed up at all times. Set all the slack adjusters to this angle. This angle even on brake application should only be slightly higher than 90 degrees. Your friend must apply the brake while you check the angle that the slack adjuster arm and the actuator push rod are making. Now, after your installation is done, you have to check the adjustment of the slack adjuster. ![]() Line the yoke pin hole with the arm hole and install the yoke pin and the cotter pin into the mechanism. The adjustment screw on the slack adjuster can be rotated. These are parts of the assembly of the slack adjuster. Make sure that it is a tight fit as it has to hold the slack adjuster into place at all times during brake operation. Step 3 – Install Retaining MechanismĪfter you have installed the slack adjuster onto the brake cam shaft, re-install the retaining mechanism on the end of the brake cam shaft. Make sure that the adjustment screw of the slack adjuster is only so tight so that there’s room for you to add grease. This angle should be maintained when the brakes are not applied. The trick is to make sure that the slack adjuster arm and its actuator push rod that helps close the adjuster on application of brakes is at a 90 degree angle. When it has slid on completely, rotate the slack adjuster until it is secured into place. ![]() To install the slack adjuster, first slide the adjuster on to the spline end of the brake cam shaft. Use the mechanic’s kit for appropriate tools to remove the mechanism. To install the slack adjuster, first remove the retaining mechanism from the brake’s cam shaft. It is installed at the end of the brake cam shaft. Your vehicle’s brakes come with a retaining mechanism. ![]()
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