Flushing; Pressure Relief Procedure - Graco GM3500 Instructions-Parts List Manual

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:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
install or clean the spray tip.
NOTE: Several flushes are often required to thoroughly clean the system and prepare it for the next fluid to be
sprayed, or to store the sprayer. Use this chart to determine the required flushing order for the fluid you are using,
and then follow the procedure below for flushing.
*Use this category for flushing a brand new sprayer and flushing after storage.
System has Next fluid to be
this fluid in it: this fluid in it: sprayed sprayed.
*Oil-based Oil-based paint –
solvent or paint new color
Oil-based Water-based paint Mineral spirits Warm soapy
solvent or paint
Oil-based Prepare for
solvent or paint storage
Water or water- Water-based paint
based paint – new color
Water or water- Oil-based paint
based paint
Water or water- Prepare for
based paint storage
1. Engage the gun safety latch.
2. Turn the engine switch to OFF.
3. Move the pressure control ON/OFF switch to OFF.
4. Disengage the gun safety latch. Hold a metal part
5. Engage the gun safety latch.
6. Open the pressure drain valve. Leave the pressure
7. Disconnect the spark plug cable.
If you suspect that the spray tip 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 the pressure gradually, then loosen com-
pletely. Now clear the tip or hose.

Flushing

Flushing order:
Flush 1 Flush 2
Mineral spirits none
water
Mineral spirits none
Warm soapy Clean water
water
Warm soapy Clean water
water
Warm soapy Clean water
water
of the gun firmly to a grounded metal pail. Trigger
the gun to relieve pressure.
drain valve open until you are ready to spray
again.
Before you spray or store
sprayer: sprayer:
Flush 3
none Prime with oil-based paint
Clean water Prime with water-based
paint
none Relieve pressure,
Leave drain valve open
none Prime with water
Mineral spirits Prime with oil
Mineral spirits Relieve pressure,
Leave drain valve open