24
308986
Operation
Hydraulic Pressure Relief Procedure
WARNING
INJECTION HAZARD
To reduce the risk of serious injury, in-
cluding fluid injection, splashing in the
eyes or on the skin, or moving parts,
always follow the
Pressure Relief Procedure
whenever you:
D
are instructed to relieve the pressure,
D
shut off the pump,
D
stop spraying,
D
check or service any of the system equipment,
D
or install or clean the spray tip/nozzle.
1.
Lock the gun trigger safety.
2.
Shut off power to the feed pumps.
3.
Shut off the hydraulic power supply.
4.
Close the supply line shutoff valve (P), then the
return line shutoff valve (R).
5.
Close the gun manifold needle valves. Unlock the
gun trigger safety.
6.
Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
7.
Lock the gun trigger safety.
8.
Open the drain valves (L, required in your system),
having a container ready to catch the drainage.
9.
Leave the drain valves open until you are ready to
dispense again.
If you suspect that the spray tip/nozzle or hose is
completely clogged, or that pressure has not been fully
relieved after following the steps above,
very slowly
loosen the hose end coupling and relieve pressure
gradually, then loosen completely. Now clear the
tip/nozzle or hose.
Check the Hydraulic Fluid
Before starting the hydraulic power supply, check the
hydraulic fluid level. Add fluid as necessary to fill lines
to replace the amount used. Use only Graco approved
hydraulic oil. Order Part No. 169236, 5 gallon (19 liter)
or 207428, 1 gallon (3.8 liter).
Flush the Pump Before First Use
The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent. See
Flushing
on page 22.
Fill Throat Packing Nuts
Keep each displacement pump throat packing nut (JJ)
filled with Graco ISO Pump Oil to help prevent fluid
from drying on the displacement rod and damaging the
pump packings. See Fig. 17.
Verify compatibility of the pump oil with the fluids being
used in the pumps. During operation very small
amounts of this fluid are dragged past the seals and
into the pump.
Fig. 17
JJ
02897
Summary of Contents for HYDRA-CAT FIXED RATIO
Page 38: ...38 308986 Notes...
Page 39: ...308986 39 Notes...
