Operation
8
308390N
Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Shut off the hydraulic power supply.
2. Close the supply line shutoff valve (H).
3. Open the dispensing valve to relieve pressure.
4. Open the pump outlet drain valve (C) and have a
container ready to catch the drainage.
5. Close the return line shutoff valve (F).
6. Leave the drain valve open until you are ready to
dispense again.
NOTE:
If you suspect that the nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above,
very slowly
loosen the hose end coupling to relieve pressure, then
clear the obstruction.
Before Starting the Pump
1.
Check all hydraulic fluid level in the hydraulic power
supply
before each use, and add fluid as necessary
to fill the lines.
2.
Flush the pump before using it for the first time
to
remove the light oil which was left in after factory
testing to protect the pump from corrosion. Be sure
the solvent used is compatible with the fluid to be
pumped and the pump wetted parts. See Technical
Data, page 20. Flush until clean solvent comes from
the outlet hose.
Starting the Pump
1. Turn on the hydraulic power supply.
2. Open the return line shutoff valve (F) and slowly
open the hydraulic supply line shutoff valve (H).
3. Adjust the flow control valve (L) to limit the hydraulic
flow to no more than 3 gpm (11 lpm), which is
approximately 60 cycles per minute.
NOTE:
If Graco Part No. 236864 hydraulic fluid control
is used, no adjustment is necessary.
4. By adjusting the pressure reducing valve control
adjustment (K), increase the hydraulic inlet pressure
from 500-1500 psi (3.4-10 MPa, 34-102 bar).
Increasing the inlet pressure increases the outlet
pressure. Decreasing the inlet pressure decreases
the outlet pressure.
5. Always use the lowest pressure possible to obtain
the desired results. This reduces pump wear.
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 Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
Be sure you
always
shut off the hydraulic supply line
shutoff valve (H) before you close the return shutoff
valve (F). This is to prevent over pressurizing the
motor or its seals. When starting up the hydraulic
system, open the return line shutoff valve first.
NOTICE
Never allow a pump to run dry of the fluid being
pumped. A dry pump quickly speeds up and can
damage itself. If it speeds up, shut off the power sup-
ply to the reciprocator immediately. Refill the supply
container, and prime the pump to eliminate air. To
prevent the pump from running dry, use a low-level
cutoff valve.
