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Slowly open the pump air regulator (10b) until the
pump starts. Run the pump slowly until fluid comes
from the drain valve (6). Close the drain valve and
continue to run the pump until all the air is pushed out
of the fluid lines. Release the gun trigger and lock the
safety latch; the pump will stall against the pressure.
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun is triggered and released.
Relieve the pressure, then install the spray tip in the
gun.
Use the pump air regulator (10b) to control the pump
speed and fluid pressure. On models with a fluid
pressure regulator (29), use it for more precise control
of pressure at the gun. Always use the lowest pressure
necessary to achieve the desired results. Higher
pressures waste fluid and cause premature wear of the
pump packings and spray tip.
Keep the packing nut/wet-cup filled with Graco Throat
Seal Liquid (TSL) to help prolong the packing life.
Check the tightness of the packing nut weekly. The
packing nut should be tight enough to prevent leakage
– no tighter. Always relieve the pressure before
adjusting the packing nut.
Wall Mount Pumps
(Model 236–065)
29
10a
16
6
Fig. 4
Operation
10b
34
21
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump acceler-
ates quickly, or is running too fast, stop it immediately
and check the fluid supply. If the supply container is
empty and air has been pumped into the lines, refill the
supply container and prime the pump and lines with
fluid, being sure to eliminate all air from the fluid sys-
tem, or flush the pump as described in Shutdown and
Care, at right.
Shutdown and Care
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Relieve the pressure whenever you shut off the
pump. Stop the pump at the bottom of its stroke to
keep fluid from drying on the exposed displacement
rod and damaging the throat packings.
Always flush the pump with a compatible solvent
before the fluid can dry on the displacement rod, and
at the end of each day. Relieve pressure after flushing.
Pail Mount Pumps
(Model 236–069)
16
10b
29
40
10a
1
42
6
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