Landoll Drexel SLT30 AC, Руководство по обслуживанию

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TIRES, BRAKES AND DRIVETRAIN
2-5
Brake System Service
NOTE
Landoll SLT30/35 AC truck braking is accomplished by
using the drive motor to restrain the truck, or by applying
pressure to the brake pedal. When the accelerator pedal
is released, the moving motion of the truck is restrained
by the drive motor in both the forward and reverse
direction. Stopping the truck can also be done by the
normal applied pressure to the brake pedal.
Check Service Drum Brakes
• The service brakes are hydraulically-actuated
drum brakes, similar to an automotive drum
brake system. The brake drums are installed on
the two front load wheels only and are self
adjusting.
• The brakes should be checked every 200 hours of
operation. Normal brake shoes can last 3,000
hours of operation, but that figure can vary
widely as determined by the operator and driving
conditions. If you are near or beyond this time
frame, you must thoroughly inspect the brakes.
• New brake shoes are approximately 0.265” (6.7
mm) thick. Replace them when the shoe
thickness is 0.0625” (1.588 mm) or less.
NOTE
A few indications of possible brake shoe replacement
are:
• Excess travel of the service brake pedal.
• The truck pulling to one side or the other when the
brakes are applied.
• Squealing or grinding is heard when brakes are
applied.
Drive the truck at creep speed and apply brakes lightly, to
determine if brakes pads are contacting the drum. You
should feel pedal resistance as the shoes contact the
drum.
If any of the above occurs during brake inspection, see
“Checking/Changing Brake Shoes,” beginning on
page 2-6.
The service brake pedal must also have about 1/2” (12.7
mm) of the travel remaining when the brakes are fully
applied. If less than 1/2” (12.7 mm) is available, adjust or
check the shoes for wear and replace as needed.
Brake Adjustment
1. Remove the ignition key and place in a secure area
2. Perform a Lock Out/Tag Out procedure.
3. Jack up and block the truck so the load wheel being
serviced is just clear of the floor and free to rotate.
Make sure other wheels are securely blocked so the
truck cannot move.
4. Rotate the tire until you can see the front cylinder
shaft and star wheel adjuster through the access
hole.
NOTE
Unlike an automobile that has “one” star wheel to adjust
the brake shoes, SLT trucks use a dual star wheel
design. Each brake shoe half, front and back, is adjusted
separately by its own star wheel.
5. Note the amount of cylinder shaft visible, then rotate
the wheel to expose the back brake shoe. Again
check the amount of visible cylinder shaft. The lesser
of the two is where you want to start.
6. Using the brake adjusting tool or flat blade screw
driver, adjust the brake shoe until light pressure is
applied to the drum.
NOTE
The star wheel adjusters use a right-handed thread
(clockwise rotation). A soft click is also heard as you
tighten the brake.

CAUTION
7. Adjust the shoe until it touches the drum. Rotating
the wheel should require only light force.
8. Rotate the wheel to place the plug hole over the
other brake shoe star wheel adjuster.
• Adjust the brake slowly and carefully. You
cannot release the adjustment (rotate the star
wheel in the opposite direction) without
dislodging the locking spring clip. Forcing
the adjusters in this direction will render the
self-adjusters inoperable and/or require
complete dis-assembly of the wheel to
prevent further damage to the brake system.
• Do not overtighten the brakes. Brake shoes
that are too tight generate excessive heat
causing premature brake shoe and tire wear,
that could eventually damage an electric
motor.
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