47
TROUBLESHOOTING
https://www.agrotkindustrial.com
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Symptom
Possible causes
How to solve
The safety valve is set at low pressure or
stuck
Adjust to regular pressure. If it fails
to increase the pressure,
disassemble and wash. If the
spring is fatigued, ass a washer or
change the spring.
Oil suction pipe of main pump explodes
or comes off
Change with a new one
The unilateral crawler
fails to move
The main pump supplying fuel to
unilateral crawler is damaged.
Change
The main valve rod is stuck and the
spring is broken
Repair or change
Traveling motor is damaged
Change
The upper and lower chambers of swivel
joint are connected
Change the oil seal or clean
the assembly
Fuel pipe of traveling system explodes.
Change
The whole excavator
moves slowly or
powerless
Less oil in hydraulic oil tank.
Adjust to specified pressure
Low engine rpm.
Adjust engine rpm
Low system safety valve pressure
Adjust to specified pressure
Serious leak inside the main pump
Change or repair the pump
The traveling motor, rotation motor and
cylinder are worn of different degree,
which causes internal leak.
Change or repair the worn parts
The aged sealing components, worn
hydraulic elements, degraded oil of old
excavator cause the operation speed
becomes powerless along with the
increase of temperature.
Change hydraulic oil, change
sealing components of the whole
machine, adjust the fit clearance
and pressure of hydraulic
components.
The blocked engine filter causes serious
decrease of loaded rpm and even flames
out.
Change the element
The blocked hydraulic filter accelerates
abrasion of pump, motor and valve and
leads to internal leak.
Clean and change the element
according to the maintenance
schedule.
Serious between main valve rod and
valve hole causes serious internal leak.
Repair the valve rod
