LGMG MT86 - Page 126

MT86 Operation and Maintenance Manual
120
No.
Causes
Root causes
Troubleshooting methods
1
Service brake forc
e is insufficient or
brake cannot be
applied
System pressure is insuffici
ent
Start the truck without stalling until the
barometer indicates 0.85 MPa, make it stall
for 10 minutes. If the pressure drops by more
than 0.15MPa, the pipeline may leak or the air
chamber may be damaged. Check the pipeline
and the air chamber. If the pressure reaches up
to 0.85 M,Pa (due to accuracy of barometer),
the air dryer and the four-circuit protection
valve may have failed. Replace them.
Brake valve is out of work
When air exists in the brake valve inlet,
depress the brake valve. If no air is exhausted
from the air outlet, replace the brake valve.
Brake air chamber is damaged
If there is no problem with the above valves,
depress the brake pedal. If the brake air
chamber 11 opening is smooth but the brake
air chamber push rod cannot be pushed out,
replace the brake air chamber.
2
Parking brake can
not be release
System pressure is insuffici
ent
Start the truck without stalling until the
barometer indicates 0.85 MPa, make it stall
for 10 minutes. If the pressure drops by more
than 0.15MPa, the pipeline may leak or the air
chamber may be damaged. Check the pipeline
and the air chamber. If the pressure reaches up
to 0.85 M,Pa (due to accuracy of barometer),
the air dryer and the four-circuit protection
valve may have failed. Replace them.
Brake valve is out of work
When air exists in the brake valve inlet,
depress the brake valve. If no air is exhausted
from the air outlet, replace the brake valve.