OPERATION & MAINTENANCE MANUAL SWDE120B-3
8. TROUBLESHOOTING
If the machine has problem and could not be operated normally, stop the machine
immediately and analyze the problem to find reasons. There are many factors which would
result in hydraulic mechanical problems. Please maintain and repair the machine as per the
following guides once finding problems with your machine.
【IMPORTANT】
Regarding to the disassembling and repairing of all hydraulic parts in hydraulic
system, please contact with Hunan Sunward Intelligent Machinery Co., Ltd.
Disassembling or repairing by yourself is not allowed.
Attention: Please refer to Cummins Engine Problems Shooting Manual for the problems
of engine.
Problem Shooting
No action or slow action of
joysticks. Large noise from
hydraulic pump, shock of
pipes.
1． Hydraulic malfunction
2． Air in hydraulic system.
3． Hydraulic oil is aged, bad,
or brand mistakes.
4． Hydraulic oil temperature
is too low.
1． Contact with local distributor.
2． Check oil intake pipes of pump if
there is leakage.
3． Change new hydraulic oil.
4． Warm up machine by running at
low speed.
No action or slow action of
joysticks
1． Park machine too long.
2． No pressure or too high
pressure in pilot system.
3． Hydraulic oil temperature
is too low.
4． Hydraulic pump
malfunction.
5． Main relief valve
malfunction.
1． Repeat operating several times.
2． Check hydraulic operating system,
low pressure relief valve and gear
pumps.
3． Warm up machine by running at
low rev.
4． Contact with local distributor.
5． Contact with local distributor.
No action or slow action of
cylinder
1． Relevant pilot valve
malfunction.
2． Relevant direction control
valve malfunction
3． Relevant overload valve
malfunction.
4． Hydraulic cylinder staff
damaged
5． Hydraulic cylinder oil
sealer damaged
1． Repair
2． Contact with local distributor.
3． Contact with local distributor.
4． Contact with local distributor.
5． Change oil sealer.
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