Graco Magnum ProX

3A3951A
EN
Repair Kit Instructions
Repair Kits for
Magnum ProX & GX Sprayers
Use these instructions when repairing the ProX or GX sprayers.
Contents
IMPORTANT SAFETY INSTRUCTIONS
Read all warnings and instructions in the repair kit instructions and in the Owners/Operation manual for the
sprayer.
Section Description Kit #
1 Drive
Front Cover Replacement page 3 17J866
Motor Replacement page 3 17F756, 17F757, 17F758,
17K684, 17L083
Fan Replacement page 4 16X980, 287770
Gear & Yoke Replacement page 5 17J863, 17J864, 17J869
2 Control Control Board Replacement page 7 17J867, 17J885
3 Pump
Pressure Control Replacement page 9 17J881, 17J927
Prime/Spray Valve and Knob Replacement page 10 17J925, 235014
Pump Outlet Valve Replacement page 11 17J880
Pump Inlet Valve Replacement page 12 17J876, 17J877, 17J924
PushPrime Button Replacement page 12 17J878
4 Accessories Magnum ProX Lacquer Conversion page 13 17J873, 17L305
Refer to the illustrations in this document and your
Owners/Operation manual for additional parts
information, wiring diagrams, and any additional
assembly torques that you may need.
Pressure Relief Procedure
Before servicing the sprayer, pump pressure must be
relieved.
1. Turn ON/OFF switch to the OFF position.
2. Engage the trigger lock. Always engage the trigger
lock when sprayer is stopped to prevent the gun
from being triggered accidentally.
3. Turn pressure control to lowest setting.
4. Put drain tube into a pail and place Prime/Spray
valve in PRIME position (drain) to relieve pressure.
5. Hold the gun firmly to a pail. Point gun into pail. Dis-
engage the trigger lock and trigger the gun to
relieve pressure.
6. Engage the trigger lock.
7. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved:
a. VERY SLOWLY loosen the spray tip guard
retaining nut or the hose end coupling to relieve
pressure gradually.
b. Loosen the nut or coupling completely.
c. Clear airless hose or spray tip obstruction.
SKIN INJECTION HAZARD: This sprayer builds up
an internal pressure of 3000 psi (20.7 MPa, 207
bar) during use. This equipment stays pressurized
until pressure is manually relieved. Follow this
Pressure Relief Procedure whenever you stop
spraying and before cleaning, checking, servicing,
or transporting equipment to prevent serious injury.

Graco Magnum ProX Specifications

General

Maximum Pressure	3000 PSI
Hose Length	50 ft
Power Source	Electric
Type	Airless
Nozzle/Tip Size	0.015 inches
Warranty	1 year

Summary

Magnum ProX & GX Sprayer Repair Kits

Important Safety Instructions

Essential safety warnings and instructions for sprayer repair.

Pressure Relief Procedure

Step-by-step guide to safely relieve pressure before servicing.

Drive Assembly Overview

Front Cover Replacement

Front Cover Disassembly

Procedure for taking apart the sprayer to access the front cover.

Front Cover Assembly

Procedure for reassembling the sprayer with the new front cover.

Motor Replacement

Fan Replacement

Gear & Yoke Replacement

Gear & Yoke Assembly

Control Board Replacement

Fuse Replacement

Pump Assembly Overview

Pressure Control Replacement

Pressure Control Disassembly

Procedure for removing the pressure control from the pump.

Pressure Control Assembly

Procedure for installing the new pressure control.

PrimeSpray Valve & Knob Replacement

PrimeSpray Valve Disassembly

Steps to remove the prime/spray valve and knob.

Pump Outlet Valve Replacement

Pump Inlet Valve Replacement

PushPrime Button Replacement

Lacquer Conversion for Magnum ProX

Pump Packing O-ring Replacement

Suction Tube Replacement