Operation; Pressure Relief Procedure - Graco GT 750 Instructions Manual

Operation

Operation
NOTE: The reference letters in the following instructions
refer to the Typical Installation illustration, page 4.
This pump is designed to be used only in pumping
non-corrosive and non-abrasive lubricants. Any
other use of the pump can cause unsafe operating
conditions and component rupture, which can result
in fluid injection or other serious injury or fire or
explosion.

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief Pro-
cedure when you stop dispensing and before clean-
ing, checking, or servicing the equipment.
1. Close the supply pump's bleed-type master air valve
(B) (required in the system).
2. Open the dispensing valve until the pressure is fully
relieved.
6
Priming and Pump Speed
Adjustment
1. Open the bleed-type master air valve (B).
2. Open the dispensing valve, and slowly open the air
regulator (E) until the pump is running smoothly.
3. After all the air is purged, close the dispensing
valve.
The pump will start and stop as the valve is opened
and closed.
4. Use the air regulator (E) to control the pump speed
and fluid pressure. Always use the lowest pressure
necessary to obtain the desired results.
5. If the pump accelerates 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:
a. Refill the supply container.
b. Prime the pump and fill the lines with fluid to
remove all the air from the fluid lines.
NOTICE
Never allow the pump to run dry of the fluid being
pumped. A dry pump quickly accelerates to a high
speed and may damage 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, prime
the pump and lines with fluid, or flush the pump and
leave it filled with a compatible solvent. Be sure to
eliminate all air from the fluid system.
3A5363B