Spray Pattern Diagnostics - Graco 16H960 Operation, Parts, Repair

Problem
Paint leaks from bottom of pump
module.
Water or thin cleaning fluids drip from
bottom of pump module.
Cannot squeeze bag to extinguish air
out of liner with a new lid.
Sprayer shuts down after 1.5 seconds
of spraying and yellow light flashes.
Liquid is squirting out of accumulator.

Spray Pattern Diagnostics

Problem
Spray pattern is pulsating:
Spray pattern has tails:
ti15526a
Spray pattern has dripping:
Spray pattern is too narrow:
ti15523a
26
Piston seal failure.
Thin fluids commonly drip while
spraying at high pressure.
O-ring has set in check valve.
O-ring in check valve is enlarged from
solvents.
Check valve is frozen from cured
material.
Pressure is too high.
Accumulator is worn out.
Cause
Operator is moving too fast while spraying. Slow speed of movement.
Tip or tip filter is clogged.
Pressure control is too low.
Incorrect tip for application of
material.
Inlet or outlet valves are worn.
Sprayer is moving too slow for material.
Sprayer is too close to target surface.
Holding trigger while changing spray
direction.
Incorrect tip for application of
material.
Pressure control is too high.
Tip is worn or damaged.
Sprayer is too close to target surface.
Incorrect tip for application of material.
Tip is worn or damaged.
ti15523a
Cause
Unclog tip or clean tip filter, page 18.
Turn up pressure control.
Change tip.
See Repair manual.
Move sprayer faster while spraying.
Move sprayer away from surface 10 in.
(25 cm)
Release trigger when changing directions.
Replace tip.
Turn down pressure control.
Replace tip.
Move sprayer away from surface 10 in.
(25 cm)
Replace tip.
Replace tip.
Troubleshooting
Solution
Replace pump module. See Repair
manual.
Replace piston seals. See Repair
manual.
Continue spraying. Paints and epoxies
will not drip.
Lightly poke bottom of check valve on
underside of lid to release valve.
Replace lid.
Replace lid.
Turn pressure control knob counter-
clockwise.
Increase tip size.
Replace accumulator.
Solution
3A2308A