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Remedy in case of faults
Type of malfunction
material is ejected only with an
upward stroke, or upward motion
of the piston rod is slow and
downward motion is fast
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
D. Piston rod moves up and down
slowly when the spray gun is
closed.
gun.
F. Piston rod sputters when stroking
upward or downward.
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.
2. Lower packing is worn.
1. Suction tube projects over the uid
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.
2. Filter cartridge in high-pressure lter
is clogged.
3. High-pressure hose is too long.
1. Solvent has made the upper packing
Measures for eliminating the malfunction
1. Clean and check the inlet valve housing. Insert ball and ll
1. Dismantle and check outlet valve seat. Insert ball and ll
2. Replace.
1. Rell the coating material
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.
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 lter cartridge.
3. Reduce length.
1. Replace upper packing.
9.4 Material feed pump