Instruction Manual

Caterpillar: Non-Confidential
Rapid air storage tank pressure loss after the machine is
parked
1. Brake inlet valve is blocked or damaged
2. Pipe connectors are loose or lines are
damaged
3. Relief valve is not sealed
1. Brake continuously several times to
remove dirt, or replace with a new valve
2. Tighten the connectors or replace the
lines
3. Investigate and replace the valve if
necessary
Slow pressure rise after the engine is started
1. Abnormal working condition of the air
compressor
2. Loose connectors
3. Unsealed brake or relief valve
1. Inspect the operating condition of the air
compressor
2. Tighten the connectors
3. Repair or replace
Machine turns when brakes are applied
1. The brake force for the right and left tires
are different
2. Air pressure in the right and left tires are
different
1. Check and repair the brake pliers and
pipe lines
2. Ensure all tires are filled to the correct
pressures
Insufficient parking brake force
1. Excessive clearance between the brake
hubs and brake discs
2. Oil on brake discs
1. Re-adjust to meet the recommended
clearance
2. Clean the oil off
Work Tool and Hydraulic System
Boom raise and bucket tilt functions are slow or dysfunctional
1. Damaged cylinder oil seals
2. Oil leakage in hydraulic lines
3. Severe inner leakage of the pump
4. Improper adjustment of the safety valve,
resulting in low system pressure
5. Air enters into the oil suction lines of the
hydraulic pump, or the oil filter is blocked
6. Excessive hydraulic valve fitting
clearance
1. Replace with new seals
2. Check and repair
3. Repair or replace the pump
4. Adjust the system pressure to the
required specification
5. Clean the filter and/or replace the oil
suction pipe
6. Repair or replace the valve