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MAINTENANCE AND LUBRICATION
Caging the Power Spring
1. Chock the trailer wheels.
2. Remove dust cap from spring brake chamber.
3. Remove the release bolt from it's holding brackets
and insert it into the spring brake chamber. DO NOT
USE AN IMPACT WRENCH TO CAGE THE SPRING
BRAKE.
4. Turn the bolt until the spring brake is caged. This
should be 2-1/4 to 2-1/2 inches of release bolt
extension.
5. The brakes should now be totally released. Do not
operate loaded trailer with brake manually released.
6. To reset the spring brake, turn the release bolt until
the spring is released. Remove the release bolt and
store it in its brackets.
7. Snap the dust cap back in place on the chamber.
Removal
1. Chock all tractor and trailer wheels and drain the air
system.
2. Mark the brake chamber for proper air line port
alignment for reassembly.
3. CAGE THE POWER SPRING following the steps
outlined in "Caging the Power Spring" on
page 4-20.
4. Disconnect the slack adjuster from the connecting
rod by removing the clevis pin (See Figure 4-16.)
5. Mark all air service lines for proper reinstallation and
disconnect from the brake chamber.
6. Remove the brake chamber from the axle brackets.
4-20
Installation
1. CAGE THE POWER SPRING following the steps
outlined in "Caging the Power Spring" on
page 4-20.
2. Position the inlet ports by loosening the service
chamber clamp bands and rotating center housing
such that ports are located according to alignment
marks made during disassembly, then retighten the
clamp bands.
3. Position the breather hole in the downward facing
position by loosening the clamp bands on the spring
brake chamber and rotating the chamber housing
until the breather hold faces downward. Retighten
the clamp bands.
4. Remount the brake chamber on the axle brackets
and reconnect the air service hoses and the slack
adjuster connecting rod (See Figure 4-16.)
IMPORTANT
Be sure the service line is on the service chamber
port and the emergency line is on the spring brake
port.
5. Check for leakage by charging the air system to a
minimum of 90 psi and applying soap suds to the
brake chamber and connections. If a growing bubble
is detected or bubbles are blown away, locate the
source of the leak and repair.
6. Insure that the clamp band is properly seated and
tight before uncaging the power spring.
Emergency Relay Valve Maintenance
Every 3600 operating hours, 100,000 miles, or yearly, the
Emergency Relay Valve should be disassembled,
cleaned, and lubricated by a trained technician.
Repair or replacement of the relay/emergency
valve is a complex operation and should be
performed by trained service personnel. Contact
a landoll authorized service center or the landoll
factory for servicing.
WARNING
F-618-0911 Edition
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