Landoll Axle Trailer 455

Remove lock valve as described in step 2 of “Leg” on page 4-33

Remove retaining plug (See Figure 4-22)

Remove o-ring plug opposite retaining plug on rectangular block

Using a drift small enough to fit through the port opened in the previous step, tap out the lock valve cartridges

Install new lock valve cartridges back to back (as illustrated). Grease o-rings

Install two new o-rings and two back-up washers on retaining plug

Thread retaining plug into body (tap gently to engage threads). Torque plug to 15 ft.lbs

Install new o-ring on plug, opposite retaining plug. Thread plug into body. Torque to 70 in.lbs

Replace spring and poppet. Replace the o-ring on plug and reinstall

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 disassembled and cleaned

The diaphragm and any marginal parts replaced

When replacing the service diaphragm, replaced 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.

Before adjusting, the vehicle must be empty with the kingpin at operating height and have air supplied to the trailer.

Disconnect linkage at all three control arms and raise the center axle control arm to the “up” position

Raise the trailer until a spacer block can be placed between axle tube and undercarriage frame

Lower the trailer by exhausting air from the air springs by moving the control arm to the “down” position until the axle tube is resting on the block

Return the control arms slowly to the center position

Insert wood locating pins into the adjusting block and bracket on the height control valves

Loosen the 1/4” adjusting lock nuts located on the adjusting blocks

Reconnect the linkages and torque to 24-48 inch lbs

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

FASTENERS Tighten/Adjust Torque

For detailed maintenance, contact a Service Center or refer to the SERVICE MANUAL.

Clean carbon more frequently when running under continuous light load and/or on leaded fuel. Use of carburetor and combustion cleaner is recommended every 200 hours to help reduce carbon buildup.

Sign off on the 200 Hourly Axle Trailer Maintenance