Instruction Manual

74
Voiding of hydraulic oil in suction line or foaming of hydraulic
oil
1. Hydraulic oil level is too low
2. Filter is blocked
3. Damaged oil pump
4. Air leakage in oil suction lines or
damaged pump seals
5. Contaminated and/or deteriorated
hydraulic oil
1. Fill oil to the required level
2. Clean the filter
3. Repair or replace the pump
4. Repair or replace the damaged parts
5. Replace with recommended new
hydraulic oil
Hydraulic oil temperature is too high
1. Excessive time running the machine at
high loads
2. Hydraulic system pressure is too low
3. Hydraulic oil level is too low
4. Damaged oil pumps
5. Blocked hydraulic lines and/or filter screen
6. Insufficient engine fan cooling
1. Stop the machine to cool it down
2. Adjust to the required pressure
3. Fill oil to the required level
4. Repair or replace the pump
5. Repair, clean, or replace the hydraulic
lines and/or filter screen
6. Adjust the engine fan belt to meet the
engineering requirement
Failure in resetting
1. Deformation of the multi-way valve reset
spring
2. Dirt between multi-way valve rods
1. Replace
2. Clean the parts
Steering System
Heavy Steering
Normal steering when the steering is slow, heavy steering when the steering is fast
1. Insufficient oil supply from the pump
2. Inflexible operation of the priority valve
spool
3. Priority valve control pressure is too low
4. Air present in the oil lines between the
priority valve and steering gear
1. Repair and replace oil pump
2. Identify potential solutions and/or replace
the priority valve
3. Adjust the control pressure
4. Turn the steering wheel until the tires are
at its maximum steering position, then
continue to turn the steering wheel, forcing
the safety valve open, thereby venting the air
out of the steering system