Tata 1612 TC 709 1109 Slack Adjuster Manufacture in India

All Tata trucks including 1612 TC 709 1109 1516 are popular in India and since India has rough conditions, one must take care of their tata slack adjusters in order to keep the brakes working at all times. When one talks about slack adjusters, the brand KDST comes to mind. The company has been making these ratchets from past one decade and is one of the few Indian slack adjuster manufacturer to make them in India. Most of the Indian retailers are selling Chinese parts which harm the economy of India. So make sure you get the Tata slack adjusters from here.

Tata 1612 TC 709 1109 Slack Adjuster Manufacture in India

The company KDST has been manufacturing slack adjusters for other companies too. This includes slack adjusters for Leyland trucks, Fuwa KKTC trailer and York trailers. 

Slack adjusters are very vital components as they are responsible for good braking. If these ratches do not work well, one will have a hard time stopping a speeding truck. Our technically advanced Ashok Leyland slack adjuster parts are made up of excellent quality raw materials. They are tested by our automotive engineers that makes truck driver life safe and of others as well. We cater these parts in every nook and corner of Indian as well as international markets. 

Tata Automatic Slack Adjuster Function Test guide

If the maximum stroke, with a 90 psi brake application is less than the distance shown in the chart on the left, the automatic KDST tata slack adjuster is functioning properly.

Slack adjuster for Tata truck

1. The KDST automatic tata slack adjuster should not require manual readjustment. If the maximum chamber stroke is within the range for the size chamber used (See fig. 1), the tata slack adjuster should not be manually readjusted.

If the chamber stroke exceeds the limit, measure the free stroke. If the free stroke is good, but the applied stroke is too long, there is a problem with the foundation brake. Check the foundation brake for missing or worn components, cracked brake drums, or improper lining to drum contact.

If the free stroke is greater than the recommended distance (3/8" - 5/8"), a function test of the automatic tata slack adjuster should be performed. To test the function of the automatic tata slack adjuster, place a 7/16" box wrench on the hex extension and rotate it 3/4 of a turn counter clockwise. A ratcheting sound will be heard. Mark the 7/16" hex to rotate clockwise.

The hex extension must rotate clockwise. The adjustment is intentionally made in small increments so it will take several cycles to bring the slack adjuster within the stroke limit shown in the chart. If the free stroke is less than 3/8", a dragging brake can occur. Check to see that the manual adjustment procedure was followed correctly. Manually readjust the brake following the “Brake Adjustment After Installation” procedure.

2. Check the torque by attaching a torque wrench to the hex extension and turning it in a counter clockwise direction and record the measurement.

3. If the hex extension did not rotate clockwise or there is less than 15 ft lb. of torque required to rotate the hex extension in the counter clockwise direction, the automatic slack must be replaced. If immediate replacement is not possible, proper brake adjustment must be maintained by manual adjustment.

4. If the hex extension rotates clockwise and has a torque of greater than 15 ft. lb. when rotated counter clockwise, the slack is functioning properly. Check the foundation brake for proper function, worn cam bushing, pins and rollers, broken springs, worn quick connect clevis, worn clevis bushings and clevis pins. Repair as necessary and repeat the function test.

5. Readjust the brake after the function test. 

How to adjust automatic Tata slack adjusters

KDST tata slack adjusters should not be manually adjusted in an effort to correct excessive push rod stroke. Excessive push rod stroke indicates that a problem exists with the automatic slack adjuster, installation, or with related foundation brake components, which manual adjustment will not fix. Manual adjustment of KDST automatic tata slack adjusters is a dangerous practice that could have serious consequences, because it gives the operator a false sense of security about the effectiveness of brakes which are likely to go out of adjustment again soon.

1. Rotate the hex extension clockwise until the brake linings contact the brake drum. Back off the automatic slack by rotating the hex counter clockwise 1/2 turn.
2. Backing off the slack will require more than 15 ft. lb. of torque. When backing off the slack, a ratcheting sound will be heard.
3. Using a ruler, measure the distance from the face of the air chamber to the center
of the large pin in the clevis (A) (see picture shown below).

Adjusting automatic slack adjuster

4. Make a 90 psi brake application and allow the chamber push rod to travel its maximum
stroke. Measure to the center of the large pin (B). The difference between (A) and (B) is
the push rod stroke. Check the chart on the second page for proper maximum stroke after
adjustment of the brakes.

5. Free stroke is the amount of movement of the slack arm required to move the brake shoes against the drum. With brakes released, measure from the face of the chamber to the center of the clevis pin. Use a lever to measure the movement of the slack adjuster until the
brake shoes contact the drum (See picture below). The difference between the released and applied measurements is the free stroke. The free stroke should be 3/8" - 5/8".

Adjusting automatic tata slack adjuster

If the free stroke is good, but the applied stroke is too long, there is a problem with the foundation brake. Check the foundation brake for missing or worn components, cracked brake drums, or improper lining to drum contact. If the free stroke is greater than the recommended
distance (3/8" - 5/8"), a function test of the automatic tata slack adjuster should be performed.

If the free stroke is less than 3/8", a dragging brake can occur. Check to see that the manual
adjustment procedure was followed correctly. Manually readjust the brake following the “Brake
Adjustment After Installation” procedure in this pocket guide.