Index revision : D - March 2018
52
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12. Common malfunctions and repairs
Defaults
Possible Causes
Remedies
Uneven paint flow
Presence of air in the paint cir-
cuit
Dump the paint circuit
Paint flow rate too slow
Increase pressure at the pump
or pressurised tank.
Impurities in the circuit
Verify the filters, then dump the
circuit.
Lack of paint in the
paint tank
Refill paint tank
Paint too viscous
Verify the paint viscosity
The paint is not flow-
ing or only barely
flowing upon exiting
the gun.
Nozzle clogged
Clean the nozzle
The nozzle needle does not
retract
Verify the nozzle needle line
Clogged filters
Clean the filters
No pump pressure
Verify the pump
Paint too viscous
Verify the paint viscosity
Obstructed paint hose
Unclog or change the paint
hose
The paint is con-
stantly flowing.
Foreign body preventing the
nozzle needle from closing.
Disassemble the seat casing,
clean it along with the seat.
Clean the nozzle needle tip
Worn nozzle needle
Replace needle and, if neces-
sary, the nozzle/tip holder
Damaged seat casing
Change the seat casing
The paint exits by the
head air holes.
Damaged cartridge
Change the cartridge
Damaged paint joint
Change the seal
Poor spray
Nozzle partially clogged
Clean the nozzle
Insufficient paint pressure
Increase the paint flow rate
Excessive viscosity
Dilute the paint
Lack of air in the spray
Increase the air pressure
Excessive paint flow rate
Decrease the paint flow rate
Nozzle damaged or worn
Change the nozzle
Orange peel effect
Evaporation of solvents too fast
Use heavier solvents
Paint droplets too large
Increase the spraying distance
Dilute the paint
Increase the paint pressure
Reduce the nozzle size
Increase the electrostatic effect