For automatic adjustment, the push rod is threaded on which the gear sits. Rotating, the gear changes the position of the push rod. After pressing the brake pedal once, a gap is provided between the brake drum and the brake shoes.
If the movement of the brake pads, as a result of wear of the brake linings, is greater than the specified clearance, then the gear, under the influence of the adjusting lever and spring, scrolls further by one tooth. The position of the push rod changes - the brake pads adjust automatically.
Attention! To remove the springs, special brake spring pliers, such as HA2ET 797, are best suited. You can also use a gas wrench.
Removing
Spring removal procedure
1. Remove brake drum.
2. Remove return spring (1). Remove spring (2) adjustment lever. Push rod adjusting gear (3) using a screwdriver, unscrew completely back. Remove return spring (4) - see fig. Removal of springs.
3. Press firmly with a gas wrench on the pressure spring plate and turn 90° (1/4 turn). While pressing, hold the pin on the back of the brake caliper.
4. Remove the second spring plate.
5. Separate the brake pads from above with your hands and remove.
6. Remove lower return springs.
7. Disconnect the handbrake cable.
Installation
Spring installation procedure
1. Install brake linings of only one quality. Clean the brake pads and brake carrier. Do not depress the brake pedal when the brake pads are removed, otherwise the piston will slip out of the brake cylinder. If the brake cylinder is damp, sort it out. Clean pressure rod threads and lubricate. Clean drums with traces of furrows. Always grind both axle drums.
2. Lubricate with a thin layer of Malykote G6 paste the threads of the pressure rod, the contact surfaces of the brake pads to the brake mount, the ribs of the brake pads in the mounts and the brake lever to the brake lever.
3. Install the handbrake cable on the brake shoe.
4. Install the lower return spring and install the brake pads on the lower support.
5. Install the pressure rod with the adjusting gear between the brake pads from above.
Attention! The push rod of the left rear wheel has a right-hand thread, the right rear wheel has a left-hand thread. The bevel of the sleeve and the long trunnion on the pressure rod point to the brake mount shield.
6. Install the brake pads on the brake piston.
7. Insert pressure spring pins from rear through brake pads.
8. Install compression springs. Install the spring plates with combination pliers and compress the spring while holding the pin at the back (see fig. Spring installation procedure).
9. Turn the spring plate 90° (1/4 turn) and stop.
10. Put on the return springs in sequence 4, 2, 1.
11. Make a basic adjustment of the rear wheel brakes.
12. Install brake drum (see subsection 7.7).
13. Press the foot brake repeatedly and strongly. This achieves adjustment of the rear wheel brakes.
14. Install the wheel, while paying attention to the markings. Remove the machine from the gantry and tighten the bolts crosswise to 160 Nm.
15. Adjust handbrake.
16. Check braking at medium speed. If the car pulls to the side during braking, find the cause and eliminate (see subsection 7.19).
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