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Braking System
Frequently Asked Questions Handy Hints and Tips Instruction Manuals & DIY
Operation of brake overun
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)
Visual checks
Before adjusting the wheel brakes always rotate the wheel(s) in the forward direction
adjustment
bearings
inspection hole
 
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.

triangleAlways replace brake shoes as a pair.
  • Check that the expander clutch,adjuster nut and transmission lever are lubricated and running smoothly (use Molybdenum Disulphide grease).
  • Check the tension on the leaf spring and that the adjusting nut is engaged onto the brakeshoe.
  • Check the pressure of the brakeshoe retaining springs.
transmission lever
Expanding clutch.
  • Lubricate expander pivot points.
  • Replace corroded expanders.
  • triangleN.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).
fig 15 and 16

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
triangleAll METAL friction points, NOT BRAKE PADS, on the wheel brake must be lubricated with Molybdenum Disulphide Grease ( AL-KO Part No. 800098 )
Al-ko footer
Frequently Asked Questions Handy Hints and Tips Instruction Manuals & DIY
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