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#Slack adjuster on semi how to
#Slack adjuster on semi manual
#Slack adjuster on semi full

On cam-type brakes, clearance adjusters are mechanical connectors between the chamber pressure rod and the camshaft. A grease screw on the adjusters enables lubrication during normal chassis maintenance. Lubricate the idler pulley with an approved lubricant every six months or 50,000 miles. Frequently Asked Questions How often should the adjusters be greased? Eliminate the wheel chocks from the rear of the wheels.

Pull the air brake lever to re-adjust the air brakes, and then switch off the engine. The identification should be no less than two inches away from the compressed air brake chamber’s back. Turn to the adjusters and locate the connecting rod pin mark. Move to the truck’s front and depress the air brake lever. Return to the truck and paint the connecting rod that connects to the air brake chamber’s rear. Wait for the air pressure to restore to at least 120 psi before turning the cart up.

Return to the air tank and shut the handle after the new adjusters are in position.

Also, remove the old adjuster on the S-cam rod and replace it with the new one. Using a rubber mallet, tap the side of the trailer tensioner toward the end of the cam rod S until the tensioner is released. The cam bar S is held in the play adjuster by this circlip. Remove the circlip on the clearance adjuster side with a flat-blade screwdriver. Then, using a rubber mallet, tap the connecting rod’s end. Begin by removing the pin from the rod’s end using pliers. The suspension adjustment is now free of the S-cam.ĭisconnect the connecting rod between the backlash adjuster and the air brake chamber by removing the pin. Turn the adjustment screw head on the back of the suspension adjuster counterclockwise to loosen it. Maintain the open position of the lever.Ĭrawl beneath the truck’s bed to locate a turnbuckle. This clears the braking system of all air and frees the moveable adjustments. Locate the air tank on the truck’s side and slowly release the valve to let extra air out of the system. Get back inside the truck and depress the air brake lever to release the air brakes. Place the wedges under both back tries to keep the vehicle from rolling away.

#Slack adjuster on semi how to

How to Replace the Brake Air Clearance Adjuster?Īdjust the air brakes and park the truck in a safe location. You should not have more than a tenth of an inch between the brake lining and the drum, and the pushrod travel should be no more than 2 inches.

Pressurize the system and brake with normal pressure. Turn the clearance adjuster a quarter to a half turn so that there is a small gap between the drum and the liner. Follow the s-cam to see which direction it moves to make sure you set it up correctly once the push rod is pushed out of the air chamber, you are wrongly adjusting it.Ĭontinue to tighten until you feel resistance, which indicates that the brake pads have been drawn near the drum. Turn the slack adjuster with an appropriate wrench. It links the cam and the pushrod to the axle box’s air chamber.

#Slack adjuster on semi manual

Mark the push rod’s departure point from the air chamber with a piece of chalk.Īdjust the manual clearance screw.

Listen for air leaks, as this can reduce your braking performance.

#Slack adjuster on semi full

Release the brake system at full pressure, release the emergency brake and press the air valve to release the brakes. The best way to prevent movement is to lift the vehicle on the jack stands while adjusting. It is important to lock the tires before the inspection so that the trailer cannot move.