 44 HC920•HC940•HC960
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 lter on HC 920
i
A clean suction lter always guarantees maximum
feed quantity, constant spraying pressure and
problem-free functioning of the unit.
 – Screwoffthelter(g.15)fromsuctionpipe.
 – Cleanorreplacethelter.
Carry out cleaning with a hard brush and an appropriate
cleaning agent.
8.3 Cleaning the high-pressure lter
Cleantheltercartridgeregularly.
Asoiledorcloggedhigh-pressurelter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(g.16,item1).
 5. Pullltercartridge(3)outofhousing(8).
 6. Cleanthepressurespring(2)andltercartridge(3)with
an appropriate cleaning agent, clean the inside of the
housing (8) and housing cover (1).
 7. Checkballintheltercartridge(3)forwearandreplace
ltercartridge,ifnecessary.
 8. Ifballinlter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.
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