User's Manual

307623H 9

Operation

Fill the displacement pump wet-cup (S) 1/3 full with

Graco Throat Seal Liquid or a compatible solvent, to

prevent fluid from drying on the displacement rod or

damaging the packings. See Fig. 3.

Fig. 3

Pump Startup

1. Turn on the hydraulic power supply.

WARNING

Be sure you always open the return line shutoff

valve (R) first, and then open the supply line valve

(E). This is to prevent overpressurizing the recipro-

cator or its seals. When starting up the hydraulic

system, open the return line shutoff valve first.

2. Open the return line shutoff valve (R) first, and

then open the supply line valve (E).

3. Slowly open the flow control valve.

4. Use the lowest pressure needed to get good fluid

flow or atomization. Higher pressures increase tip

wear and pump wear.

In a direct supply system, the pump will start when the

gun or valve is opened, and stall when it is closed.

In a circulating system, the pump will operate continu-

ously until the hydraulic power supply is turned off.

Shutdown and Care of the Pump

WARNING

To reduce the risk of serious injury whenever you

are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 8.

For overnight shutdown, relieve the pressure. Stop

the pump at the bottom of its stroke to prevent fluid

from drying on the exposed displacement rod and

damaging the throat packings.

Always flush the pump before the fluid dries on the

displacement rod. Never leave water or water-based

fluid in the pump overnight. First, flush with water or a

compatible solvent, then with mineral spirits. Relieve

the pressure, but leave the mineral spirits in the pump

to protect the parts from corrosion.