a. 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.
b. 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
Section 4-8.2a.
4.
Disconnect the slack adjuster from the
connecting rod by removing the clevis pin
(See Figure 4-13)
.
5.
Mark all air service lines for proper
reinstallation and disconnect from the
brake chamber.
6.
Remove the brake chamber from the axle
brackets.
c. Installation
1.
CAGE THE POWER SPRING following the
steps outlined in
Section 4-8.2a.
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 4-13).
IMPORTANT
BE SURE THE SERVICE LINE IS ON THE SERV-
ICE 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.
4-8.3
Emergency Relay Valve Maintenance
Every 3600 operating hours, 100,000 miles, or
yearly, the Emergency Relay Valve should be dis-
assembled, cleaned, and lubricated by a trained
technician.
WARNING
REPAIR OR REPLACEMENT OF THE
RELAY/EMERGENCY VALVE IS A COM-
PLEX OPERATION AND SHOULD BE
PERFORMED BY TRAINED SERVICE
PERSONNEL. CONTACT A LANDOLL
AUTHORIZED SERVICE CENTER OR
THE LANDOLL FACTORY FOR SERVIC-
ING.
4-16
Summary of Contents for 825A
Page 8: ......
Page 12: ......
Page 14: ...3 2 Figure 3 1 Model 825 Trailer Terminology Figure 3 2 Service Hookups...
Page 18: ...3 6 Figure 3 3 Hydraulic Controls...
Page 22: ...3 10 Figure 3 5 Swingout Outrigger Platform Extension...
Page 24: ...3 12 Figure 3 6 Gooseneck Attachment to Frame...
Page 34: ......
Page 36: ...4 2 Figure 4 1 Lubrication Points...
Page 40: ...4 6 Figure 4 2 Model 825A Wiring Diagram...
Page 43: ...4 9 Figure 4 4 Tandem Axle Air Ride Suspension System...
Page 44: ...4 10 Figure 4 5 Tandem Axle W Flip Air Ride Suspension System...
Page 47: ...4 13 Figure 4 8 Checking Axle Alignment Figure 4 9 Examples of Camber...
Page 52: ...4 18 Figure 4 12 Axle and Brake Assembly...
Page 59: ...4 25 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence...
Page 69: ...NOTES 5 9...
Page 70: ......
