Operation; Pressure Relief Procedure; Flush Before Using Equipment; Trigger Lock - Graco Merkur 313255F Instructions Manual

Operation

Pressure Relief Procedure

1. Engage the trigger lock.
2. See F . 1. Turn off the bleed-type master air valve
IG
(U).
3. Disengage the trigger lock.
4. Hold a metal part of the gun firmly to a grounded
metal waste container. Trigger the gun to relieve
fluid pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves in the system, having a
waste container ready to catch the drainage. Leave
the drain valve(s) open until you are ready to spray
again.
7. If you suspect that pressure has not been fully
relieved after following the steps above, check the
following:
a. The spray tip may be completely clogged. Very
slowly loosen the air cap retaining ring to relieve
pressure in the cavity between the ball/seat
shutoff and the plugged tip. Clear the tip orifice.
b. The gun fluid filter or the fluid hose may be com-
pletely clogged. Very slowly loosen the hose
end coupling at the gun and relieve pressure
gradually. Then loosen completely to clear the
obstruction.
c. After following the steps above, if the spray tip
or hose still seems completely clogged, very
slowly loosen the tip guard retaining nut or hose
end coupling and relieve pressure gradually,
then loosen completely. With tip removed, trig-
ger gun into waste container.
313255F

Flush Before Using Equipment

The equipment was tested with lightweight oil, which is
left in the fluid passages to protect parts. To avoid con-
taminating your fluid with oil, flush the equipment with a
compatible solvent before using the equipment. See
Flush the Pump, page 17.

Trigger Lock

See F . 4. Always engage gun trigger lock when you
IG
stop spraying to prevent gun from being triggered acci-
dentally by hand or if dropped or bumped.
Gun Trigger
Safety Locked
Gun Trigger
Safety Unlocked
F . 4. Trigger Lock
IG
Operation
TI6581A
TI6582A
13