Pressure Control Calibration - Graco GM5000 Instructions-Parts List Manual

PRESSURE CONTROL CALIBRATION
1.
Follow the Pressure Relief Procedure Warning on
page 17.
2. Install the new
50
ft (15.2 m) spray hose to the
the gun and a new ,025 to 0.29 size tip. Install the
sprayer outlet. On the other end of the hose, install
fluid-filled pressure gauge in the top port (6
-
See
trol cover.
Fig 19-1) of the fluid filter. Remove thepressurecon-
3. With the gun safety latch engaged, start the engine
(only). Using a 318" ignition wrench, turn the pressure
adjustment nut (E) clockwise two full turns. See Fig
21-1. With the pressure control knob (D) turned to
the minimum setting, turn the sprayer switch ON.
THE DISPLACEMENT PUMP SHOULD NOT CYCLE
If it does cycle, shut the sprayer switch
OFF,
disen-
gage the gun safety latch, trigger the gun into a
grounded waste container until pressure is relieved,
and enQaae the latch again. Turn the nut (E) a little
further cl6ckwise. Turnthe sprayer on again to be
sure THE PUMP DOES NOT CYCLE.
4. Increase the throttle setting and then the pressure
control setting to the maximum while triggering the
gun. Keep the gun triggered while observing the
pressure at which the pump stalls, which should be
approximately
3000
psi (21 0 bar).
NOTE: When the gun trigger is released, it is normal for
the stall pressure to be 31
00
to 3400 psi (217 to
238 bar), during this procedure.
justing nut (E) clockwise to reduce pressure and
If thepressure is not3000psi(210 bar), turn the ad-
counterclockwise to increase pressure to obtain
exactly 3000 psi (21 0 bar) pressure.
Then note the pressure to which the gauge drops be-
fore the pressure starts to rise again.
If
the pressure drops to below 2600 psi (182 bar),
turn the differential wheel (A) clockwise to bring the
pressure to 2600 psi
(1
82 bar).
bar), turn the differential wheel (A) counterclock-
If the pressure stops dropping before 2600 psi (1 82
wise to decrease the pressure.
5. Follow the Pressure Relief Procedure Warning on
water out with mineral spirits, relieve pressure again,
page 17. Install the pressure control cover. Flush the
and then remove all
the
test equipment.
Fig 21-1
W
307-847 21