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GMAX

II

3900/5900/5900HD/7900

SETUP

Connect hose to sprayer and gun.
Tighten hose connections with wrench.

Unscrew tip 
& guard from gun.

Fill throat packing nut 
with TSL to prevent 
premature packing wear.

Make sure 
power switch 
is set to OFF.

Check oil level of
motor and pump.

Cold engine starts.

Turn prime valve 
to Prime position (down).

Place siphon tube in pail
partially filled with water.

Turn pressure control knob 
to lowest pressure, and 
set power switch to ON.

Increase pressure until sprayer
starts and water runs out of
prime tube.
Let water run out of prime
tube for 15 seconds.

Decrease pressure
until sprayer stops.

Turn prime valve 
to Spray position 
(horizontal).

Make sure safety lever of
gun is OFF.

Aim gun at inside 
wall of water pail 
and squeeze trigger.

Increase pressure until
sprayer starts. Keep gun 
triggered into water pail 
for 1 minute. Release trigger.

Turn prime 
valve to Prime 
position (down).

Place siphon tube in paint
pail, but leave drain tube in
water pail.

Aim gun at inside wall of
water pail, and squeeze
trigger.

Transfer drain 
tube to paint pail.

Increase pressure until
sprayer starts and paint
comes out of drain tube.

Keeping gun triggered into water
pail, turn prime valve to Spray
position (horizontal).

When paint comes out of gun,
release trigger and turn safety
lever of gun to ON.

Screw tip & guard onto gun, making sure 
arrow-shaped handle of tip is pointing forward. You
can reverse this tip to quickly clear clogs 
without taking it apart.

This procedure is for water-base paints and flushing fluids. For solvent-base paints and flushing 
fluids (i.e. mineral spirits), you must read Fire and Explosion Hazard in the Operating Instructions.

* check the Graco operations manual delivered with the unit for more details.

CHOOSE THE RIGHT TIP & FILTER 

WARNING

1

3

2

4

Quick Operator’s Guide

207

307

109

209

309

409

509

609

111

211

311

411

511

611

113

213

313

413

513

613

115

215

315

415

515

615

815

217

317

417

517

617

817

917

119

219

319

419

519

619

819

121

221

321

421

521

621

721

821

223

323

423

523

623

723

225

325

425

525

625

725

327

427

527

627

827

429

529

629

729

331

531

631

831

433

533

633

833

235

435

535

635

735

835

935

439

443

543

645

451

551

455

555

655

5 cm

10 cm

15 cm

20 cm

25 cm

30 cm

35 cm

40 cm

45 cm

3 cm

7 cm

10 cm

15 cm

20 cm

25 cm

30 cm

35 cm

40 cm

pump filter

gun filter

200 mesh

100 mesh

100 mesh

100 mesh

60 mesh

60 mesh

none

none

30 mesh

* at 30 cm spraying distance

Ink

St

ains

Lacquers Enamels Ur

ethanes

Acrylics Emulsions Lat

ex

Block fi

ller

Intumesc

ents

Texture material 

for spray applications

1

st

 digit X5

=

fan width

*

Time to

change!

NEW

WORN

All manuals and user guides at all-guides.com

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