Flush - Graco Merkur series Instructions-Parts List Manual

Flush

To avoid fire and explosion, always ground equipment
and waste container. To avoid static sparking and
injury from splashing, always flush at the lowest
possible pressure.
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 Flush on page 11.
Flush the pump:
• Before first use
• When changing colors or fluids
• Before repairing equipment
• Before fluid dries or settles out in a dormant pump
(check the pot life of catalyzed fluids)
• At the end of the day
• Before storing the pump.
Flush at the lowest pressure possible. Flush with a fluid
that is compatible with the fluid you are pumping and
with the wetted parts in your system. Check with your
fluid manufacturer or supplier for recommended flushing
fluids and flushing frequency.
1. Follow Pressure Relief Procedure, page 10.
2. See F . 1. Lock gun trigger. Remove tip guard and
IG
spray tip from gun (H). Refer to gun manual.
3. Place suction tube in a compatible solvent.
NOTE: Do not stretch hose tight; let it hang to assist
fluid flow into pump.
332245G
4. Turn regulator adjustment knob (E) counterclock-
wise until it stops, and gauge (D) reads zero.
C
5. Open bleed type master air valve (C).
6. Flush hose and gun:
a. Disengage gun trigger lock. Hold gun against a
grounded metal pail.
b. Trigger gun. Slowly open regulator adjustment
knob (E) until pump begins to cycle and a
steady stream comes from gun. Trigger gun for
10-15 seconds.
c. After solvent is running clean, stop pump by
turning the regulator adjustment knob (E)
counter-clockwise until it stops and the gauge
(D) reads zero. Once the material stops flowing,
release the trigger and engage the trigger lock.
Stop pump with rod buried in the pump.
d. Close bleed type master air valve (C).
Operation
D
E
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