Filter
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44 HC 920 • HC 940 • HC 960
GB
Interruption of work Cleaning the unit (shutting down)
9. Move the hydraulic ball valve on the material feed pump to
its horzontal position (closed).
10. Turn off the gasoline engine or electric motor.
8.1 Cleaning the unit from the outside
Danger
Gasoline units — Switch off the gasoline engine
and let it cool down.
Electric units — Unplug the mains plug from the
socket.
Danger
Danger of short-circuits through penetrating
water.
Never spray down the unit with high-pressure or
high-pressure steam cleaners.
Wipe the unit off with a cloth soaked in a suitable cleaning agent.
8.2 Suction filter on HC 920
i
A clean suction filter always guarantees maximum
feed quantity, constant spraying pressure and
problem-free functioning of the unit.
– Screw off the filter (fig. 15) from suction pipe.
– Clean or replace the filter.
Carry out cleaning with a hard brush and an appropriate
cleaning agent.
8.3 Cleaning the high-pressure filter
Clean the filter cartridge regularly.
A soiled or clogged high-pressure filter can cause a poor spray
pattern or a clogged tip.
Disassembly
1. Move the hydraulic ball valve on the material feed pump to
its horzontal position (closed).
Flow of hydraulic oil to hydraulic motor of material feed
pump is interrupted.
2. Turn the relief valve handle (3) fully counterclockwise (k
Circulation).
3. Turn off the gasoline engine or electric motor.
4. Unscrew the housing cover (fig. 16, item 1).
5. Pull filter cartridge (3) out of housing (8).
6. Clean the pressure spring (2) and filter cartridge (3) with
an appropriate cleaning agent, clean the inside of the
housing (8) and housing cover (1).
7. Check ball in the filter cartridge (3) for wear and replace
filter cartridge, if necessary.
8. If ball in filter cartridge (3) is thoroughly worn, aremove
O-ring (6) and valve seat (7). Replace worn valve seat, if
necessary.
9. Always replace O-ring (6) after removal.
10. Pull off pressure spring (2) from housing cover (1).
Measure length of pressure spring, and replace if shorter
than 19 mm.