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FIGURE 1 FIGURE 2 FIGURE 3
QUALITY FOR LIFE
4. Servicing and Cleaning
4.1 Replacing friction pads (lateral friction pads)
This should be done when the arrow on the pressure plate has reached or
passed the “replace” marking on the housing (Figure 15/3).
Uncouple AKS 2004/AKS 3004.
Remove protective caps (Figure 16/1) with the aid of a screwdriver.
Press out the worn out friction pads (fig. 16/2) inwards and remove (use
punch and hammer).
Insert new friction pads from below with the pin in the sleeve and press in
as far as they will go. (Pin will engage no tools necessary). Re-insert shim
rings, if present.
4.2 How to check the wear of the brake lining of the friction pads
The brake lining of the AKS 2004/AKS 3004 friction pads are subject to a
certain degree of mechanical wear after high mileage. To show when the
friction pads are worn, a wear indica-tor is built into the handle (Figure
17/1).
Couple the AKS 2004/AKS 3004 onto the towing vehicle (do not activate
stabilizer unit). If a green indicator is visible (figure 18/2) then the AKS
2004/AKS 3004 is in a new condition or the wear of the ball and the AKS
2004/AKS 3004 is within permissible limits.
If only a red indicator is visible (Figure 19/3) then this can have the
following causes:
AKS 2004/AKS 3004 is not worn but the tow ball has reached its lowest
limit of wear ( 49 mm or smaller)
AKS 2004/AKS 3004 and the tow ball show signs of wear
Tow ball is in a new condition (50 mm) but the brake lining of the AKS
2004/AKS 3004 friction pads (Figure 14/2 and 3) show a high degree of
wear.
Establish the diameter of the tow ball so that conclusions may be drawn as to the wear of the
brake lining of the AKS 2004/AKS 3004 friction pads (ball diameter must not be less than 49 mm)
PLEASE NOTE: All maintenance work should be carried out by specialist workshops authorized
by AL-KO (Service Centers) or in accordance with the AL-KO Operating Instructions.
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