Mal function
Reason for caused malfunction
Solution
The pump can not be started
Un-suitable power source
Confirm if the power meets pump’s
need
The power is not connected
Check the power
The system has no pressure
The coupler is not connected
properly
Re-install
No oil in the tank
Fill oil
Not enough oil
Fill oil
Check if flow control valve, single-
direction valve in the system is open
Open the flow control valve to ensure
the system is connected
The system has no pressure
after reinstall the couplers
The couplers is not connected in
the properly position
Uninstall the couplers, check if the steel
roll is elastic with a rod, if it can not move
please knock it with hammer to elimina
te the mist hydraulic oil.
Leaking in the couplers
The o-ring, retaining ring worn
out in the couplers
Replace the couplers
The pressure for high-pressure
leaking valve is adjusted too low
Please check the gauge, adjust it to
rated value
Oil is mixed with water
Replace the oil, please
Ball steel in pressure relief valve
may be broken or the valve seat
may be frayed
Replace them,please
Air may be sucked into the system
Repeat operating the system with no
load for several times to eliminate air
The leaking valve may be frayed
Replace it, please
High-pressure leaking valve may
not be tightened
Tighten it, please
The o-ring for high-pressure leaking
valve may be broken
Replace it, please
There may be some inclusion into
the oil
Wash the power pack valve and
replace oil
The system pressure can
not reach to the rated
pressure
There is a strong noise
when the power pack is
operated
The bearing may be broken
Air may be mixed into this power
pack
Replace it, please
Exhaust the air from the system
When using under static
pressure, the pressure
reduces slowly
The seal is out of control,please
check all the seal
Replace the seal
Piston or spring may be broken
Change them, please
Leaking may be happened at
brushfire position
Tighten the couplers and replace
the seals
Oil lever may be too low
High-pressure system may not
eliminate the oil fully
Please try several times without load
before using
Too low oil temperature may make
lead to suck oil difficultly
Control the temperature at -10℃ to
60℃ ,please
Oil temperature may be too high
that cause the damage of pump
If so, the power pack need to be
replaced with new one
High-pressure flux is not
enough
Fill the oil,please
TROUBLE SHOOTING GUIDE OF HYDRAULIC PUMP
8
