BENDIX PIGGYBACK SPRING BRAKE Manuel - Sayfa 5

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Do not remove the Piggyback Spring Chamber

Clamps.

1. Mechanically release the old piggyback spring brake by

following the original manufacturer's instructions.

2. Ensure air pressure is removed from all air reservoirs

before removing the air hoses or working on the

spring brake.

3. Remove air hoses from the Piggyback spring brake

chamber. Be sure to mark both hoses to ensure

proper reinstallation.

4. Clamp a pair of vise grips around the service pushrod

touching the non-pressure housing. This cages the

service return spring.

5. Remove the clamp nuts and service clamp assembly

and carefully remove the old piggyback chamber.

INSTALLING THE BENDIX PIGGYBACK SPRING

BRAKE CHAMBER

1. Visually inspect the service diaphragm for excessive wear,

damage or cracks. Replace if needed. To replace the

service diaphragm, perform the steps outlined in

"Replacing the Service Diaphragm".

2. Line up the new piggyback spring brake chamber, the

service diaphragm, and the non-pressure housing,

ensuring that they are centered.

3. Reassemble the service clamp assembly. Ensure all

parts are seated properly and remain centered.

4. Torque the clamp nuts to 25 ft/lbs. Remove the vise grips

from the service push rod.

5. Reconnect the emergency air line to the emergency

porthole and reconnect the service air line to the

service porthole.

6. Pressurize the service half by putting air into the service

port. Do not exceed 120 psig. Test for leaks around the

clamps. No leaks are acceptable.

7. Uncage the main spring and return the release tool into

the release tool side pocket.

8. Replace the dust cap in the keyhole.

WARNING!

Check for proper service and emergency operation

after servicing any part of the brake chamber(s). Check

the brake adjustment if the combination spring brake

was removed/installed (Follow vehicle manufacturer's

instructions to adjust the brakes).

REMOVAL AND INSTALLATION OF THE

COMBINATION SPRING BRAKE

WARNING!

Do not mechanically release (cage) the spring if there

is any structural damage to the piggyback spring brake

FIGURE 5 - PIGGYBACK CHAMBER

chamber. Caging the spring in such a chamber may

cause serious injury or death. Replace the complete

assembly.

REMOVAL:

1. Mechanically release (cage) the old piggyback spring

brake chamber by following the original manufacturer's

instructions.

2. Ensure air pressure is removed from all air reservoirs

before removing the air hoses or working on the spring

brake.

3. Remove air hoses from the piggyback spring brake

chamber. Be sure to mark both hoses to ensure proper

reinstallation.

4. Remove the yoke pin, disconnect the yoke from the slack

adjuster, remove the mounting nuts, washer, and lock

washers and remove the combination spring brake. While

removing, use care to prevent the combination spring

brake from falling.

INSTALLATION:

1. Install the combination spring brake using the furnished

hardware. Torque the mounting nuts to 110 ft/lbs.

Connect the yoke to the slack adjuster and install the

yoke pin and the cotter pin.

2. Reconnect the emergency air line to the emergency

porthole and reconnect the service air line to the service

porthole.

3. Pressurize the service chamber by putting air into the

service port. Do not exceed 120 psig. Test for leaks

around the clamps. No leaks are acceptable.