Motrec E-322, Operator And Maintenance Manual

Page: 16 / 61

Maintenance
- 15 -
HYDRAULIC & PARKING BRAKES
FOR MODELS WITH TOWING CAPACITY UP TO 16,000 LB (7270 KG)
Revision 2012-01-23
DRUM BRAKES
Remove brake drums and check lining wear. Replace shoes and springs if the lining thickness is 1/16"
(2mm) or less. Turn the brake adjustment to reduce the clearance between lining and drum. Wheels must
turn free when the pedal is released.
DISC BRAKES
Check pad linings. Replace pads if lining thickness is 1/16" (2 mm) or less.
PARKING BRAKE
Replace cables and stoppers if cable play exceeds 1/8” (4mm).
Wheels and/or differential pinion must turn freely when the parking brake is released.
On pinion brake, use spacers at pad fixed ends to reduce space between pads and pulley to 1mm.
To install new cables and stoppers:
-insert the new cable through the hand lever end;
-pull the cable out from the brake assembly 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 Lb-Ft (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 30-40
Lbs or 14-18 kg is required on the handle to set the parking brake. Tighten the locking screw.
BRAKE PEDAL
If the brake pedal becomes soft or spongy, air may have entered the hydraulic system and the brake system
has to be bled:
1. fill the master cylinder with brake fluid (DOT-3);
2. bleed front calipers one at a time by having someone applying a steady pressure on the brake
pedal, and close the bleeder before allowing the brake pedal to return to up position;
3. fill the master cylinder with brake fluid (DOT-3);
4. bleed rear wheel brakes one at a time, following the same procedure;
5. fill the master cylinder with brake fluid (DOT-3);
6. clean every fitting and line, remove traces of oil;
7. apply a continuous pressure on the brake pedal for about five minutes ;
8. Finally, inspect brake lines and fittings for leaks ;