SATA HKU, Operating Instructions Manual

Page: 11 / 27

SATA HKU | 11
8. Trouble-shooting
Malfunction Cause Corrective Action
Pump does not work No or low air pressure Check the air line valve, regulator and
quick coupling.
Defective air motor Check the air motor and the seals. Re -
place defective parts.
Foreign object jamming the movement of
the central bar.
Check for free movement and for foreign
objects inside the piston valve etc.
Clogging of material hose, shut-off valve,
spray gun or filter.
Remove clogging
Pump pressure regulator incorrectly set or
defective.
Check material pressure regulator.
Pump reciprocating but not delivering Barrel empty Replace barrel
Float valve jammed (if fitted). Check if float valve moves freely, as re -
quired.
Foot valve not functioning Check spring and ball for correct opera -
tion and seating. Check for foreign objects
jammed in the foot valve.
Piston valve or seals worn. Check for foreign objects in piston valve
seat. Check seals for wear and damage.
Pump runs irregularly Excessive air resistance on the suction
side.
Lower the air pressure in order to reduce
the speed of the pump or mount a speed
regulator.
Packings are chafed. Replace packings ( Attention: Repair must
be carried out by the manufacturer only.)
Suction hose or suction tube does not seal
properly, pump takes in air.
Seal with teflon band.
Oil/spraying medium is leaking from the
exhaust silencer
Packing between air motor and pump is
worn out or damaged.
See section "Service of the air motor"
Pump is running despite the outlet being
closed.
Packing on the lower piston assembly is
worn out or damaged.
See section "Service of the pump mecha -
nism"
Dirt in the bottom valve or in the lower
piston assembly.
Compressor performance drops during
operation of the material pump
Compressor performance insufficient Install larger compressor
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