Landoll Axle Trailer 455-50’CA

Vehicle is empty with the kingpin at operating height and have air supplied to the trailer

Linkage disconnected at all three control arms and center axle control arm raised to the “up” position

Trailer raised until a spacer block can be placed between axle tube and undercarriage frame

Trailer lowered by exhausting air from the air springs until the axle tube is resting on the block

Control arms returned to the center position and wood locating pins inserted into the adjusting block and bracket on the height control valves

1/4” adjusting lock nuts located on the adjusting blocks loosened and control arms allowed to oscillate approximately 1”

Linkages reconnected and torqued to 24-48 inch lbs

1/4” adjusting lock nuts at the adjusting blocks retightened to 24-48 in. lbs

Remove dust cap from spring brake chamber

Remove the release bolt from its holding brackets and insert it into the spring brake chamber

DO NOT USE AN IMPACT WRENCH TO CAGE THE SPRING BRAKE

Measure the release bolt extension

The brakes should now be totally released

Do not operate loaded trailer with brake manually released

Reset the spring brake, turn the release bolt until the spring is released

Remove the release bolt and store it in its brackets

WIRING AND CONNECTIONS Inspected

See Table 2-1 and Table 2-2 for correct torque specifications.

See Table 4-1 for recommended lubricant.

FASTENERS Tighten/Adjust Torque

Warning: The spring brake chamber employs a spring with high forces. Service should not be attempted. Serious injury or death may result.

Check the condensation holes on the underside of the brake chambers to make sure they are open

The spring brake has two brake chambers, a service chamber and an emergency chamber or spring chamber.

Service brake chambers should be disassembled and cleaned per interval described in Table 4-2.

The diaphragm and any marginal parts should be replaced.

When replacing the service diaphragm, replace the corresponding parts for the other chamber on the same axle (to aid in even brake application and release).

Examine yoke pin for wear and replace as necessary.

The spring chamber should not be serviced.