Rothenberger ROWELD E Series - Page 20

20
6.3 Frequent malfunction analyses and solutions
During the using, hydraulic unit and 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
1. switch is fault.
2. Power source is not connected
well.
3. The socket inside connection is
loosen
4. The machine is not grounded
correctly
1. Check the switch
2. Connect the power well
3. Check the connection
4. Check the earthing connection
2
The pump
motor rotate too
slowly with
abnormality
noise
1. The motor is overloaded
2. The motor is fault
3. The oil filter is blocked
4. The working voltage is instable
1. Make sure the motor load is
less that 3 MPa
2. Repair or replace the pump
3. Clean the filter
4. Check the instability of power
3
The cylinder
works
abnormally
1. The direction valve is damaged
2. There is air in system
3. The system pressure is too low
4. The quick coupler is blocked
5. The pressure relief valve is not
locked
1. Replace the direction valve.
2. Move the cylinder several times
to outgo the air.
3. Adjust the system pressure
4. Replace the quick coupler
5. Lock the valve
4
Cylinder leak
1. The oil ring is fault
2. The cylinder or piston is damaged
badly
1. Replace the oil ring
2. Replace the cylinder
5
The pressure
can not be
increased or the
fluctuation is too
big
1. The core of overflow valve is
blocked.
2. The pump is leak.
3. The joint slack of pump is loosened
or key groove is skid.
4. 4. The pressure relief valve is not
locked
1. Clean or replace the core of
over-flow valve
2. Replace the pump
3. Replace the joint slack
4. 4. Lock the valve