Troubleshooting; Malfunctions And Remedies - JLG T500J Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE

Troubleshooting

Malfunction
Insufficient braking effect
Brake reacts by jerks
Trailer is braked unilaterally
Trailer is already braked when the accelerator
pedal is released.
Reverse driving hard to accomplish or even
impossible
Braking action of handbrake insufficient
Wheel brakes get hot
Ball coupling does not rest on ball
3-10
Table 3-1. Malfunctions and Remedies
Cause
Excessive backlash in brake system
Brake linings not run in
Brake linings glazed, oily or damaged
Overrunning hitch hard to operate
Brake linkage is jammed or deformed
Brake Bowden cables rusty or kinked
Excessive backlash in brake system
Shock absorber of overrunning hitch defective
Backmat brake shoe is jammed in the brake shoe holder Service at qualified workshop
Wheel brakes are actuated unilaterally
Shock absorber of overrunning hitch defective
Brake system adjusted too tightly
Bowden cables pre-loaded
See "Brake reacts by jerks"
Incorrect setting
Brake system incorrectly set
Wheel brakes dirty
Reversing lever of overrunning hitch is jammed
Spring type actuator is pre-loaded in zero position; nuts
are turned in too far
Handbrake lever not or only partially released
Coupling dirty on the inside
Ball of towing vehicle too big
Remedy
Service at qualified workshop
Actuate hand-brake lever slightly; drive 1-2 miles (2-3 km)
Service at qualified workshop
Grease overrunning hitch
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Actuate handbrake lever as far as possible
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Service at qualified workshop
Set handbrake lever into zero position
Clean and grease properly
Check ball diameter: According to DIN 74058 the ball on the tow vehicle
must not exceed 50 mm in diameter when new and it must be Ø 49.5
mm. If the ball diameter decreases to less than 49.0 mm, the ball has to
be replaced. The ball must be perfectly spherical.
3121200