Shutdown And Care Of The System - Graco PRESIDENT HYDRA-CAT 231657 Instructions-Parts List Manual

Shutdown and Care of the System

Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
D are instructed to relieve the pressure,
D stop spraying,
D check or service any of the system equipment,
D or install or clean the spray tips.
1. Engage the dispensing valve safety latch.
2. Shut off the feed pump and proportioning pump air
regulators and bleed-type master air valves.
3. If the system has heaters, circulate the fluid for at
least 10 minutes to cool the heated fluid and
heater.
4. Disengage the dispensing valve safety latch.
5. Hold a metal part of the dispensing valve firmly to
the side of a grounded metal pail, and trigger the
dispensing valve to relieve pressure.
6. Engage the safety latch.
7. Open the mixer manifold drain valves (required in
your system), having a container ready to catch
the drainage. Close the valves immediately.
8. Use the solvent pump to flush the mixer manifold
valves.
If you suspect that the nozzle or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
nozzle or hose end coupling and relieve pressure
gradually, then loosen completely. Now clear the
nozzle or hose.
System Shutdown
To shut the system down, shut off the air to all pumps,
trigger the dispensing valve into a grounded metal
waste container. Close the mixer manifold valves.
Flush all the mixed fluid out of the mixer manifold,
hoses and dispensing equipment. See page 17. Then
follow the Pressure Relief Procedure.
Cleaning the Pump Inlet Strainer
If the fluid pressure from the feed pump to the propor-
tioning pump cannot be maintained on the propor-
tioning pump intake gauge (J), check and clean the
strainer (V).
Care of the Pump Throat Packing Nuts
Keep the throat packing nuts filled with appropriate
lubricant and check the tightness of the packing nut
weekly. See Fig. 19. The packing nut should be tight
enough to prevent leakage; no tighter. Too tight an
adjustment causes the packings to bind or wear pre-
maturely and leak. Always follow the Pressure Relief
Procedure before adjusting the packing nut.
Fig. 19
JJ
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