Zoomlion QY30V, Manual

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09 - 13 09 - 13
D i a g n o s t i c s D i a g n o s t i c s
9.2 9.2.6 Brake syst .6 Brake syst em em
Problem Causes Remedy Problem Causes Remedy
Brake bias Brake bias
Uneven brake force. Uneven brake force.
Check and adjust Check and adjust
brake. The
brake. The
clearance
clearance
between brake
between brake
drum and brake
drum and brake
shoe is about 0.3
shoe is about 0.3
to 0.5mm.
to 0.5mm.
The air pressures inflated to the tires are not The air pressures inflated to the tires are not
same.
same.
Check and inflate Check and inflate
pressure.
pressure.
Brake shoe is not wear to the same extent. Brake shoe is not wear to the same extent.
Check and Check and
replace brake
replace brake
shoe.
shoe.
Brake locked Brake locked
The clearance between brake shoe and brake The clearance between brake shoe and brake
wheel hub is too small. wheel hub is too small.
Check and adjust Check and adjust
brake. The
brake. The
clearance
clearance
between brake
between brake
drum and brake
drum and brake
shoe is about 0.3
shoe is about 0.3
to 0.5mm.
to 0.5mm.
Br Brak ake c e cha hamb mber er pu push sh ro rod r d ret etur urns ns un un-s -smo moot othl hly y.. Re Repa pair ir or or re repl plac ace e
Brake main valve and relay Brake main valve and relay valve are cross valve are cross
connected inside. connected inside.
Repair or replace Repair or replace
Parking brake is unreleased. Parking brake is unreleased.
Check and Check and
release parking
release parking
brake.
brake.
Brake is invalid Brake is invalid
and responses
and responses
lag
lag
Inner Inner leakage leakage occurs occurs in in brake brake chamber. chamber. Repair Repair or or replace replace
Air leakage occurs in pipe line and valve. Air leakage occurs in pipe line and valve. Repair or replace Repair or replace
Air drier invalid. Air drier invalid. Repair or replace Repair or replace
Four-circuit Four-circuit protection protection valve valve invalid. invalid. Repair Repair or or replace replace
Differential lock Differential lock
does not work.
does not work.
Coil of transversal and longitudinal solenoid valve Coil of transversal and longitudinal solenoid valve
damaged.
damaged.
Repair or replace Repair or replace
Spool of transversal and longitudinal solenoid Spool of transversal and longitudinal solenoid
valve blocked.
valve blocked.
Repair or replace Repair or replace
Air leakage occurs in end cover and pipe line of Air leakage occurs in end cover and pipe line of
transversal and longitudinal solenoid valve. transversal and longitudinal solenoid valve.
Repair or replace Repair or replace
Actuating cylinder of differential lock invalid. Actuating cylinder of differential lock invalid. Repair or replace Repair or replace