Graco Mark VII Max User Manual

Troubleshooting
3A2244A 11
Pump output is low Pump rod damage Repair pump. See pump manual.
Low stall pressure Turn pressure knob fully clockwise. Make sure
pressure control knob is properly installed to
allow full clockwise position. If problem per-
sists, replace pressure transducer.
Piston packings are worn or dam-
aged
Replace packings; see pump manual.
O-ring in pump is worn or damaged Replace o-ring; see pump manual.
Intake valve ball is packed with mate-
rial
Clean intake valve; see pump manual.
Pressure setting is too low Increase pressure; see pump manual.
Large pressure drop in hose with
heavy materials
Use larger diameter hose and/or reduce overall
length of hose.
Check to see if 10/16 Amp switch is
on 10A setting. Make sure circuit is
able to provide 16A.
Switch to 16A setting. Change to circuit that
provides 16A. Change to less loaded circuit.
Motor runs but pump does
not stroke
Displacement pump pin damaged or
missing; see pump manual.
Replace pump pin if missing. Be sure retainer
spring is fully in groove all around connecting
rod; see pump manual.
Connecting rod assembly damaged;
see pump manual.
Replace connecting rod assembly; see pump
manual.
Gears or drive housing damaged,
page 26.
Inspect drive housing assembly and gears for
damage and replace if necessary; see pump
manual.
Excessive paint leakage
into throat packing nut
Throat packing nut is loose Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
Throat packings are worn or dam-
aged
Replace packings; see pump manual.
Displacement rod is worn or dam-
aged
Replace rod; see pump manual.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections. Cycle
pump as slowly as possible during priming.
Tip is partially clogged Clear tip; see Operation manual.
Fluid supply is low or empty Refill fluid supply. Prime pump; see pump man-
ual. Check fluid supply often to prevent running
pump dry.
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column

Graco Mark VII Max Specifications

General

Brand	Graco
Model	Mark VII Max
Category	Paint Sprayer
Language	English