Rothenberger ROWELD E Series - Hydraulic Unit Malfunctions

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6.3 Frequent malfunction analyses and solutions
During the using, electrical units may appear some problems. Frequent malfunction is listed
as follows:
Please use tools attached, spare parts or other tools with a safety certificate while maintain or
replace parts. Tools and spare parts without safety certificate are forbidden to be used.
Malfunctions of hydraulic unit
No
malfunction
malfunction analyzes
Solutions
1
The pump
motor does not
work
9. switch is fault.
10. Power source is not connected
well.
11. The socket inside connection is
loosen
12. The machine is not grounded
correctly
9. Check the switch
10. Connect the power well
11. Check the connection
12. Check the earthing connection
2
The pump
motor rotate too
slowly with
abnormality
noise
9. The motor is overloaded
10. The motor is fault
11. The oil filter is blocked
12. The working voltage is instable
9. Make sure the motor load is
less that 3 MPa
10. Repair or replace the pump
11. Clean the filter
12. Check the instability of power
3
The cylinder
works
abnormally
11. The direction valve is damaged
12. There is air in system
13. The system pressure is too low
14. The quick coupler is blocked
15. The pressure relief valve is not
locked
11. Replace the direction valve.
12. Move the cylinder several times
to outgo the air.
13. Adjust the system pressure
14. Replace the quick coupler
15. Lock the valve
4
Cylinder leak
5. The oil ring is fault
6. The cylinder or piston is damaged
badly
5. Replace the oil ring
6. Replace the cylinder
5
The pressure
can not be
increased or the
fluctuation is too
big
9. The core of overflow valve is
blocked.
10. The pump is leak.
11. The joint slack of pump is loosened
or key groove is skid.
12. 4. The pressure relief valve is not
locked
9. Clean or replace the core of
over-flow valve
10. Replace the pump
11. Replace the joint slack
12. 4. Lock the valve
Malfunctions of electrical units