9-8
5. BRAKE SYSTEM
5. BRAKE SYSTEM
Trouble symptom
Trouble symptom
1. Insufficient braking force
2. Brake acting unevenly.
(Machine is turned to one
side during braking.)
·
Hydraulic system leaks oil.
·
Hydraulic system sucks air.
·
Lining surface soiled with water or oil.
·
Lining surface roughened or in poor
contact with drum.
·
Lining worn.
·
Brake valve or wheel cylinder mal-
functioning.
·
Hydraulic system clogged.
·
Tires unequally inflated.
·
Brake out of adjustment.
·
Lining surface soiled with water or oil.
·
Earth intruding into brake drum.
·
Lining surface roughened.
·
Lining in poor contact with drum.
·
Lining worn.
·
Brake drum worn or damaged
(distortion or rusting).
·
Wheel cylinder malfunctioning.
·
Brake shoe poorly sliding.
·
Back plate mounting bolt loose.
·
Back plate deformed.
·
Wheel bearing out of adjustment.
·
Hydraulic system clogged.
·
Adjust tire pressure.
·
Adjust.
·
Clean or replace.
·
Clean.
·
Repair by polishing or replace.
·
Repair by polishing.
·
Replace.
·
Repair or replace.
·
Repair or replace.
·
Adjust.
·
Retighten or replace.
·
Replace.
·
Adjust or replace.
·
Clean.
·
Repair and add oil.
·
Bleed air.
·
Clean or replace.
·
Repair by polishing or replace.
·
Replace.
·
Repair or replace.
·
Clean.
Probable cause
Probable cause
Remedy
Remedy
3. Brake trailing.
4. Brake chirps
5. Brake squeaks
·
Pedal has no play.
·
Brake shoe poorly sliding.
·
Wheel cylinder mal-functioning.
·
Piston cup faulty.
·
Return spring fatigued or bent.
·
Parking brake fails to return or out of
adjustment.
·
Brake valve return port clogged.
·
Hydraulic system clogged.
·
Wheel bearing out of adjustment.
·
Brake trailing.
·
Piston fails to return.
·
Lining worn.
·
Lining surface roughened.
·
Lining surface roughened.
·
Lining worn.
·
Poor shoe to lining contact.
·
Excessively large friction between
shoe and back plate.
·
Foreign matter on drum sliding surfa-
ce.
·
Drum sliding surface damaged or di-
storted.
·
Brake shoe deformed or poorly insta-
lled.
·
Back plate mounting bolt loosening.
·
Worn anchor or other contact portion.
·
Adjust.
·
Adjust.
·
Repair or replace.
·
Replace.
·
Replace.
·
Repair or adjust.
·
Clean.
·
Clean.
·
Adjust or replace.
·
See 3. Brake trailing.
·
Replace.
·
Replace.
·
Repair by polishing or replace.
·
Repair by polishing or replace.
·
Replace.
·
Replace.
·
Clean and apply brake grease.
·
Clean
·
Replace.
·
Replace or repair.
·
Retighten.
·
Replace.