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The
overrun device can be described as the control device of
the overrun brake system. A draw-bar force is produced
at the coupling point by reducing the speed of the towing
vehicle. After the threshold level has been passed, the
draw shaft is pushed in, thus actuating the overrun lever,
the wheel brakes (1 & 2) are then applied via the expanding
clutch (3) (Fig 2) |
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| Before adjusting
the wheel brakes always rotate the wheel(s) in the
forward direction |
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Check the condition of the brake shoes.
The wear on the shoes is greatest where the inspection hole is located on the
backplate. The leading shoe usually wears faster than
the trailing shoe.
 Always
replace brake shoes as a pair.
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Check that
the expander clutch,adjuster nut and transmission
lever are lubricated and running smoothly (use
Molybdenum Disulphide grease).
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Check the tension
on the leaf spring and that the adjusting nut is
engaged onto the brakeshoe.
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Check the pressure
of the brakeshoe retaining springs.
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Expanding clutch.
- Lubricate expander pivot points.
- Replace corroded expanders.
- N.B Note
the correct position for fitting: Expander lever
pivot arm (2) to transmission lever pivot bolt (1).
These points must always be on the same side
(Fig 16).
Return springs.
- Replace relaxed or damaged
return (pull off) springs.
Transmission lever.
- Lubricate pivot points.
- Replace corroded or damaged levers and pivot bolts.
- If the lever does not abut the adjuster housing stop , replace extension spring
(Fig 14).
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Adjusting assembly.
- Lubricate adjusting nuts.
- Unscrew the adjuster screw and lubricate the thread.
- Replace corroded or damaged screws or nuts.
Leaf springs (adjuster housing).
- Replace corroded or relaxed leaf springs.
N.B The adjuster screw,nut and leaf spring are only supplied
as a complete assembly.
Part No.s are as follows:
- 1637 Brakes -387706
- 2051 Brakes -387323
- 2361 Brakes -387323
All
METAL friction points, NOT BRAKE PADS, on the wheel brake
must be lubricated with Molybdenum Disulphide Grease (
AL-KO Part No. 800098 )
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