Mechanical Brakes - Motrec E-242HD Operator And Maintenance Manual

Maintenance
Revision 2008-02-06
REPLACING THE BRAKE SHOES ON SELF ADJUSTING DRUM BRAKES:
raise the vehicle until the rear tires lift-off the floor and install two jack stands on rear;
remove drums;
replace brakes shoes and springs if linings are 1/16" (2mm) thick or less
disassemble and clean the adjusting screw assembly;
check brake lever and replace lever and pin if there is wear in the pivot;
replace all spring parts;
apply Hi-Temp grease on mechanisms and install the adjusting screw assembly;
check pulling rods, make sure that they are of the same length;
install drums and make sure that there is no contact with brake shoes;
depress and release the brake pedal until the brakes are adjusted;
drive the vehicle to check brakes.
ADDITIONAL INORMATION FOR MANUALLY ADJUSTED DRUM BRAKES.
Before any brake adjustment, check the brake levers on the inboard side of the backing plates. The
levers must be equally pulled . Adjust pulling rods if necessary. The shoes are adjusted by turning the
stud (17mm key) located on the inboard side of the backing plate. Turning the stud clockwise will
reduce the drum to shoe clearance. Properly adjusted shoes will equally brake the rear wheels. Avoid
Shoe contact with drum when the pedal is released.
PARKING BRAKE
Replace cables and stoppers if cable play exceeds 1/8" (4mm).
To install new cables and stoppers:
-insert the new cable through the hand lever end;
-pull the cable out from the brake assembly or brake pedal end;
-insert the stopper on the cable and leave a maximum play of 1mm;
-for a two-cable system, make sure that cable length is the same at hand lever end;
-tighten ¼-ncx3/4 grade-5 bolt in stopper at 8 LbFt (11NM) torque;
-cable must extend 1.5" (4cm) out of the cable stopper, cut cable excess.
Once cable play has been checked and/or adjusted, turn the knob on the brake lever until a force of 75 Lbs
or 34 kg is required on the handle to set the parking brake.

MECHANICAL BRAKES

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