WAGNER HC 920 Operating Manual - page 48
46
HC920•HC940•HC960
GB
Remedy in case of faults
9.
Remedy in case of faults
9.1
Gasoline engine
9.2
Electric Motor
9.3
Hydraulic motor
Type of malfunction
A. Gasoline engine does not start up
Type of malfunction
A. Unit does not start
B. HC 960 units:
Piston rod in the material feed
pump is not moving up and down.
Type of malfunction
A. Hydraulic motor stuck in the lower
position.
B. Hydraulic motor stuck in the upper
position.
C. Low pressure. The piston rod
moves correctly in the downward
stroke, but the upward stroke
is sluggish. The outside of the
hydraulic motor is very hot.
D. Low pressure. The outside of the
hydrau lic motor becomes very
hot when stroking upward and
downward.
Possible cause
1. No gasoline.
2. ON/OFF switch to OFF.
3. Gasoline cock closed.
4. Engine problem.
5. Engine defective.
6. Oillevelinsufficient.
Possible cause
1. Indicator light does not indicate unit
has power.
2. The unit has switched off
automatically because of an
overload.
1. Direction of the rotation of the
electric motor is incorrect
Possible cause
1. Outlet valve seat in the material
feed pump is loose.
2. Reversing valve in the hydraulic
motor is stuck or the upper or lower
hexagonal nut on the valve rod has
become loose.
1. Reversing valve is stuck.
2. Pressure spring on valve rod is
broken.
3. Pressure spring stop on valve rod is
broken.
4. Air in the hydraulic motor.
5. Air in the material feed pump.
1. Faulty piston packing in hydraulic
motor.
2. Piston rod is broken.
1. Middle O-ring on reversing valve is
faulty.
2. Packings in the material feed pump
are worn.
Measures for eliminating the malfunction
1. Fill the gasoline tank.
2. Move the switch to ON.
3. Open the gasoline cock.
4. Please refer to the engine instructions.
5. Bring to the Honda service point.
6. Top off oil.
Measures for eliminating the malfunction
1. Check power supply.
2. Wait 2 – 3 minutes, then turn the unit back on.
1. Turn the polarity changer in the power plug 180º.
Measures for eliminating the malfunction
1. Ball valve on the material feed pump – lever position
vertical. Screw out sealing screw on hydraulic motor.
Press down reversing valve on hydraulic motor.
Remount sealing screw. Start unit. The piston rod
moves upward and then gets stuck in the lower
position. The cause is a loose outlet valve seat.
2. Take unit to a Wagner authorized service center.
1. Take unit to a Wagner authorized service center.
2. Take unit to a Wagner authorized service center.
3. Take unit to a Wagner authorized service center.
4. Turn back pressure control knob.
Vent air at low pressure during a 5 – 10 minute
endurance run. Do not let the material feed pump
run dry.
Check for leaks:
•Looseconnectionsonhydraulicoiltank
•Looseconnectionsonthehydraulicoilpump
•Loosehydraulicoilhoseconnections
•Levelofoilinhydraulictankistoolow
5. Ball valve on the material feed pump – lever position
vertical. Screw out sealing screw on hydraulic
motor. Press down reversing valve on hydraulic
motor. Remount sealing screw. Start unit. Prevent
the material feed pump from sucking up air.
1. Take unit to a Wagner authorized service center.
2. Take unit to a Wagner authorized service center.
1. Take unit to a Wagner authorized service center.
2. Replace