Multiquip AP6 Series - Manual (Page 58)

PAGE 58 — AP6/AP8 SERIES TRASH PUMPS • OPERATION AND PARTS MANUAL — REV. #0 (06/11/14)
MAINTENANCE (TRAILER)
The following trailer maintenance guidelines are intended
to assist the operator in preventive maintenance.
TRAILER BRAKES
Properly functioning brake shoes and drums are essential
to ensure safety. The brakes should be inspected the first
200 miles of operation. This will allow the brake shoes and
drums to seat properly. After the first 200 mile interval,
inspect the brakes every 3,000 miles. If driving over rough
terrain, inspect the brakes more frequently.
ELECTRIC BRAKES
Electrically actuated brake (Figure 55) are similar to
hydraulic brakes. The basic difference is that hydraulic
brakes are actuated by an electromagnet. Listed below
are some of the advantages that electric brakes have over
hydraulic brakes:
„ Brake system can be manually adjusted to provide the
corrected braking capability for varying road and load
conditions.
„ Brake system can be modulated to provide more or less
braking force, thus easing the brake load on the towing
vehicle.
„ Brake system has very little lag time between the time
the vehicle’s brakes are actuated and the trailer’s brakes
are actuated.
„ Brake system can provide an independent emergency
brake system.
Remember in order to properly synchronize the tow vehicle’s
braking to the trailer’s braking, can only be accomplished
by road testing. Brake lockup, grabbiness or harshness is
due to lack of synchronization between the tow vehicle and
the trailer being towed or under-adjusted brakes.
Before any brake synchronizations adjustments can be
made, the trailer brakes should be burnished-in by applying
the brakes 20-30 times with approximately a 20 mph
decrease in speed, e.g. 40 mph to 20 mph.
Allow ample time for brakes to cool between application.
This allows the brake shoes to slightly be seated into the
brake drum surface.
Figure 55 displays the major electric brake components that
will require inspection and maintenance. Please inspect
Figure 55. Electric Brake Component
BREAKAWAY BRAKE
Breakaway Battery
This battery supplies the power to operate the trailer brakes
if the trailer uncouples from the tow vehicle. Be sure to
check, maintain and replace the battery according to the
battery manufacturer instructions.
Breakaway Switch
This switch causes the breakaway battery to operate the
electric brakes if the trailer uncouples from the tow vehicle.
The pull cable for the pull pin is connected to the tow vehicle,
and the switch is connected to the trailer.
To check for proper functioning of the switch, battery and
brakes, you must pull the pin from the switch and confirm
that the brakes apply to each wheel. You can do this by
trying to pull the trailer with the tow vehicle, after pulling
the pin. The trailer brakes may not lock, but you will notice
that a greater force is needed to pull the trailer.
Secondary Shoe
Hold Down
Washer
Self-Adjusting
Cable
Adjuster Spring
Adjuster Lever
Adjuster Assembly
Magnet
Primary Shoe
Backing Plate
Actuating Lever
Retractor Spring
WARNING
If electric breakaway brakes do not operate when trailer
is uncoupled from the tow vehicle, death or serious
injury can occur.
Check emergency breakaway brake system
BEFORE
each tow.