Haulotte Group 3522A, Operator'S Maintenance Manual

Page: 114 / 142

HAULOTTE GROUP 9 AXLE AND RELATED COMPONENTS
114
SET UP AND ADJUSTMENT (CONTINUED)
GENERAL MAINTENANCE – HYDRAULIC BRAKES
Drum Brake Adjustment - Manual
Most Dexter 12 1/4” hydraulic brakes have a self adjusting feature. If manual adjusting is required,
use the following procedure:
Brakes should be adjusted (1) after the first 200 miles (322 Kilometers), of operation when the brake
shoes and drums have “seated”, (2) at 3,000 mile (4,828 Kilometers) intervals, (3) or as use and
performance requires. The brakes should be adjusted in the following manner:
1. Jack up trailer and secure on adequate capacity jack stands. Follow trailer manufacturer’s
recommendations for lifting and supporting the unit. Maker sure the wheel and drum rotates
freely.
2. Remove the adjusting hole cover from the adjusting slot on the bottom of the brake backing plate.
3. With a screwdriver or standard adjusting tool, rotate the star wheel of the adjuster assembly to
expand the brake shoes. Adjust the brake shoes out until the pressure of the linings against the
drum makes the wheel very difficult to turn.
NOTE
: For drop spindle axles, a modified adjusting tool may be necessary.
4. Then rotate the star wheel in the opposite direction until the wheel turns freely with a slight lining
drag.
5. Replace the adjusting hole cover and lower the wheel to the ground.
6. Repeat the above procedure on all brakes. For best results, the brakes should be set at the same
clearance.
Synchronizing Your Trailer Brakes
To insure safe brake performance and synchronization, read the brake controller manufacturer’s
instructions completely before attempting any synchronization procedure.
Make several hard stops from 20 mph (32 Km/hr) on a dry paved road free of sand and gravel. If the
trailer brakes lock and slide, decrease the gain setting on the controller. If they do not slide, slightly
increase the gain setting. Adjust the controller just to the point of impending brake lockup and wheel
skid.
CAUTION
DO NOT lift or support the trailer on any part of the axle or
suspension system. NEVER go under any trailer unless it
is properly supported on jack stands which have been
rated for the load. Improperly supported vehicles can fall
unexpectedly and cause serious injury or death.
CAUTION
Before road testing, maker sure the area is clear of
vehicular and pedestrian traffic. Failure to brake safely
could result in an accident and personal injury to your self
and / or others.