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9.4
Material feed pump
Type of malfunction
A.
A sufficient amount of coating
material is ejected only with an
upward stroke, or upward motion
of the piston rod is slow and
downward motion is fast
B.
A sufficient amount of coating
material is ejected only with a
downward stroke, or downward
motion of the piston rod is slow
and upward motion is fast.
C.
Piston rod moves up and down
quickly.
D.
Piston rod moves up and down
slowly when the spray gun is
closed.
E.
Not enough pressure to the spray
gun.
F.
Piston rod sputters when stroking
upward or downward.
HC 950 • HC 970
GB
Possible cause
1.
Inlet valve is leaky due to impurities or
wear.
2.
Coating material viscosity is too high,
preventing it from being sucked up.
1.
Outlet valve leaky.
2.
Lower packing is worn.
1.
Suction tube projects over the fluid
level and sucks in air.
2.
Coating material viscosity is too high,
preventing it from being sucked up.
3.
Ball in inlet valve housing is stuck.
1.
Loose connections.
2.
Relief valve is not closed completely.
3.
Relief valve worn.
4.
Lower packing worn.
5.
Ball in inlet valve housing and ball
in outlet valve seat are not sealing
properly.
1.
Tip is worn.
2.
Filter cartridge in high-pressure filter
is clogged.
3.
High-pressure hose is too long.
1.
Solvent has made the upper packing
expand.
Measures for eliminating the malfunction
1.
Clean and check the inlet valve housing. Insert ball and fill
with water; if leaky, replace ball.
2.
Thin out according to the manufacturer's instructions.
1.
Dismantle and check outlet valve seat. Insert ball and fill
with water; if leaky, replace ball.
2.
Replace.
1.
Refill the coating material
2.
Thin out the coating material according to manufacturer's
instructions.
3.
Vent air from material feed pump and turn the relief valve
knob to the left (k Circulation).
1.
Dismantle inlet valve housing, clean ball and valve seat.
Check all connections between the material feed pump
and spray gun.
2.
Turn relief valve handle (3) fully clockwise (p spray).
3.
Replace
4.
If the measures described above do not help, replace
lower packing.
5.
Dismantle inlet valve housing and outlet valve seat. Clean
balls and valve seats.
1.
Replace
2.
Clean or replace the filter cartridge.
3.
Reduce length.
1.
Replace upper packing.
41
Remedy in case of faults
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