All Pumps; Shutdown - Graco L500CM Instructions-Parts List Manual

All Pumps

To reduce the risk of fluid injection, do not use your
hand or fingers to cover the bleed hole on the under-
side of the bleed valve body (N) when priming the
pump. Use the handle or a crescent wrench to open
and close the bleed plug. Keep your hands away from
the bleed hole.
If the pump fails to prime properly, open the pump bleed
valve (N) slightly. See F
IG
underside of the valve, as a priming valve until the fluid
appears at the hole. Close the plug.
NOTE: Always use lowest possible fluid pressure to
bleed air out of pump.
F . 6. Pump Bleed Valve
IG
NOTICE
Do not allow the pump to run dry. It will quickly accel-
erate to a high speed, causing damage. If your pump
is running too fast, stop it immediately and check the
fluid supply. If the container is empty and air has been
pumped into the lines, refill the container and prime
the pump and the lines, or flush and leave it filled with
a compatible solvent. Eliminate all air from the fluid
system.
3A0096B
. 6. Use the bleed hole, on the
ti14668a
NOTE: When changing fluid containers with the hose
and valve already primed, open the pump bleed valve
(N), to help prime the pump and vent air before it enters
the hose. Close the valve when all air is eliminated.
With the pump and lines primed, and with adequate
input pressure and volume supplied, the pump will start
and stop as you open and close the valve. In a circulat-
ing system, the pump will speed up or slow down on
demand until it is shut off.

Shutdown

Never leave water or water-based fluid in a carbon
N steel pump overnight. If you are pumping water-based
fluid, flush with water first, then with a rust inhibitor,
such as mineral spirits. Relieve pressure, but leave
rust inhibitor in pump to protect parts from corrosion.
1. Stop the pump at the bottom of the stroke to prevent
fluid from drying on the exposed displacement rod
and damaging the throat packings.
2. Follow Pressure Relief Procedure, page 13.
3. Always flush the pump before the fluid dries on the
displacement rod. See Prime/Flush on page 13.
Shutdown
NOTICE
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