7308330
Operation
Pressure Relief Procedure
WARNING
SKIN INJECTION HAZARD
Fluid under high pressure can be in-
jected through the skin and cause seri-
ous injury. To reduce the risk of an injury
from injection, splashing fluid, or moving parts, fol-
low the Pressure Relief Procedure whenever you:
Dare instructed to relieve the pressure,
Dstop spraying,
Dcheck or service any of the system equipment,
Dor install or clean the spray tips.
1. Lock the spray gun/dispensing valve safety latch.
2. Close the supply line shutoff valve(s) first, then the
return line shutoff valve(s). In a multi-pump sys-
tem, do this at each pump to isolate the pumps.
3. Unlock the gun/valve safety latch.
4. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun/valve to
relieve pressure.
5. Lock the gun/valve safety latch.
6. Open the pump outlet drain valve(s), having a
container ready to catch the drainage.
7. Leave the drain valve(s) open until you are ready
to spray/dispense again.
If you suspect that the tip/nozzle or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
tip guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Now clear
the obstruction.
Startup
Before each use, check the hydraulic fluid level and
add fluid as necessary to fill the lines.
To start the pump, turn on the hydraulic power supply.
Open the return line shutoff valve first,then open the
supply line shutoff valve.
WARNING
Hydraulic Oil Temperature
If hydraulic oil becomes too hot, it can reach its
flash point and cause a fire. Operating at too high
an oil temperature can also cause faster motor seal
wear and leakage. The recommended hydraulic oil
operating temperature is 80–115_F (27–45_C). If
the oil temperature approaches 130_F (54_C), shut
off the motor and check the hydraulic oil supply
cooling system, filters, etc. Clean or repair as
needed.
Always use Graco-approved Hydraulic Oil or
equivalent. Order Part No. 169236, 5 gal. (19 liter)
or 207428, 1 gal. (3.8 liter). Do not substitute a
lower grade oil or one with a lower flash point.
The equivalent is 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 equipment,
contact your Graco distributor. Unauthorized use
of lesser grade oil or substitutes will void the
warranty.
Shutdown & Care
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure at left.
Relieve the pressure. Always shut off the supply line
shutoff valve first,and then the return line shutoff
valve. This is to prevent overpressurizing the motor or
its seals. When starting the hydraulic system, open the
return line shutoff valve first.
