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Operation
8 308391J
Operation
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Close the supply line shutoff valve, and then the
return line shutoff valve.
2. Open the dispensing valve to relieve the pressure.
3. Place a container under the drain valve to catch any
drainage. Open the pump outlet drain valve.
4. Leave the drain valve open until you are ready to
dispense again.
NOTE: If you suspect that the dispensing valve, exten-
sion, or grease fitting coupler is clogged, or that the
pressure has not been fully relieved after following the
steps above, VERY SLOWLY loosen the coupler or
hose end coupling and relieve pressure gradually, then
loosen completely and clear the clog.
Before Starting the Pump
Recommended Hydraulic Oil
Use a Graco-approved Hydraulic Oil or a premium, ISO
grade 46 petroleum-based hydraulic oil containing rust
and oxidation inhibitors and anti-wear agents.
Before using any other type of oil in this motor contact
your Graco distributor. Unauthorized use of lesser grad
oil or substitutes may void the warranty.
1. Check the 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 that was left in after factory test-
ing to protect the pump from corrosion. Be sure the
solvent used is compatible with the fluid to be
pumped and the pump’s wetted parts. See Techni-
cal Data, page 18. Flush until clean solvent comes
from the outlet hose.
To Start the Pump
1. Turn on the hydraulic power supply.
2. Open the return line shutoff valve (H) first, and
slowly open the hydraulic supply line shutoff valve
(K). (F
IG. 2)
3. Adjust the hydraulic inlet pressure from 500 to 1500
psi (3.5 to 10.3 MPa, 35 to 103 bar) with the regula-
tor control adjustment (M) on the hydraulic fluid con-
trol (A). Increasing the inlet pressure increases the
outlet pressure. Decreasing the inlet pressure
decreases the outlet pressure.
4. 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.