Graco LineLazer II 3900 Quick Start Guide

Graco LineLazer II 3900

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308941

Rev. B

First choice when

quality counts.t

INSTRUCTIONS–PARTS LIST

INSTRUCTIONS

This manual contains important

warnings and information.

READ AND KEEP FOR REFERENCE.

Kits, Line Guide

For LineLazert 3500 & 5000 and LineLazer II 3900 & 5900

Model 241101, Series A

Short, for parking lot striping and road striping

Model 241102, Series A

Long, for road striping only

Installation

NOTE: Steps 1 and 2 apply to

LineLazer 3500 & 5000 only.

1. Drill two holes on both sides of chassis frame,

as shown in Fig. 1.

Fig. 1

8851A

1.0 in.

1.0 in.

A = 5.55 in. — LineLazer 3900 & 5900 (already drilled)

Front

4X Ĭ .330

through both walls

A = 6.55 in. — LineLazer 3500 & 5000 (must be drilled)

A

2. Mount one bracket (6) on right side of chassis

(viewed from front) with two flange screws (7) and

two lock nuts (8), as shown in Fig. 2.

Fig. 2

6, 7, 8

7

8

6

1

8850A

Right-side bracket is

already mounted on

LineLazer 3900 & 5900.

NOTE: Steps 3 and 4 apply to all LineLazers.

3. Slide left-side bracket (6) onto rod (1). Note

bracket orientation. Insert rod in right-side bracket.

4. Mount left-side bracket (6) on chassis with two

flange screws (7) and two lock nuts (8).

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

ECOPYRIGHT 1999, GRACO INC.

Graco Inc. is registered to I.S. EN ISO 9001

Other manuals for Graco LineLazer II 3900

Instructions30 pages

Instructions-Repair28 pages

Questions and Answers:

S
Samuel SmithAug 17, 2025
How to troubleshoot a Graco LineLazer II 3900 Paint Sprayer engine that won't start?
- J
  John JeffersonAug 17, 2025
  If your Graco Paint Sprayer engine won't start, first ensure the engine switch is in the ON position. If that doesn't work, check if the engine is out of gas and refill the tank. Also, verify the engine oil level and replenish if low. Inspect the spark plug cable for disconnections or damage, and connect or replace it as needed. For a cold engine, use the choke. Confirm that the fuel shutoff lever is in the ON position. If oil is seeping into the combustion chamber, remove the spark plug, pull the starter rope several times, clean or replace the spark plug, and keep the sprayer upright.
R
Richard FrenchAug 20, 2025
Why won't my Graco Paint Sprayer engine start?
- M
  Misty ClayAug 20, 2025
  Your Graco Paint Sprayer engine may not start due to several reasons. Ensure the engine switch is ON. Check if the engine is out of gas and refill if needed. Verify the engine oil level and replenish if low. Make sure the spark plug cable is connected and not damaged; replace the spark plug if necessary. If the engine is cold, use the choke. Also, confirm the fuel shutoff lever is in the ON position. If oil is seeping into the combustion chamber, remove the spark plug, pull the starter rope a few times, clean or replace the spark plug, and keep the sprayer upright.
M
Matthew BurkeAug 22, 2025
How to prime Graco Paint Sprayer if it is difficult?
- J
  Julie CoxAug 23, 2025
  If your Graco Paint Sprayer is difficult to prime, check for air in the pump or hose by tightening all fluid connections. Reduce engine speed and cycle the pump slowly during priming. Inspect the intake valve for leaks, ensuring the ball seat isn't damaged and the ball seats well after cleaning and reassembling the valve. Also, if the paint is too thick, thin it according to the supplier’s recommendations. Decreasing the throttle setting before priming the pump can also help.
C
Cristina HarrisAug 25, 2025
Why is fluid spitting from the gun of my Graco LineLazer II 3900?
- I
  iriceAug 26, 2025
  If fluid is spitting from the gun of your Graco Paint Sprayer, it could be due to air in the pump or hose. Check and tighten all fluid connections and reprime the pump. Another reason could be a partially clogged tip, so clear the tip. Also, ensure the fluid supply isn't low or empty, and refill if necessary, priming the pump afterward. Check the fluid supply often to prevent the pump from running dry.
J
Joshua MirandaAug 28, 2025
What to do if paint leaks into the wetcup of my Graco Paint Sprayer?
- M
  Mike BarberAug 28, 2025
  If paint leaks into the wetcup of your Graco Paint Sprayer, first try tightening the wetcup just enough to stop the leakage. If the leak persists, the throat packings may be worn or damaged, or the displacement rod may be worn or damaged.
C
Crystal BoyerAug 30, 2025
What to do if fluid delivery is low on my Graco Paint Sprayer?
- J
  Jennifer MckenzieAug 30, 2025
  If the fluid delivery is low on your Graco Paint Sprayer, check the following: * Ensure the inlet screen isn't clogged and clean it if necessary. * Increase the pressure setting. * Increase the engine throttle setting. * Check the fluid filter, tip filter, and tip for clogs or dirt and clean them. * If you're using heavy materials, a larger diameter hose and/or shorter hose length might be needed. Avoid using more than 100 ft of 1/4 in. hose; use 3/8 in. hose for best performance (minimum 50 ft).
C
Cynthia ChapmanSep 2, 2025
What causes low pump output on upstroke of my Graco Paint Sprayer?
- J
  jenniferfrancoSep 2, 2025
  Low pump output on the upstroke of your Graco Paint Sprayer could be due to a clogged hose inlet screen, so clean the inlet screen. It could also be that the piston ball is not seating. Another potential cause is worn or damaged piston packings, or a worn or damaged O-ring in the displacement pump.
E
Evan RobertsSep 5, 2025
What to do if the Graco LineLazer II 3900 Paint Sprayer engine runs but the displacement pump doesn't operate?
- R
  raymondryanSep 5, 2025
  If the Graco Paint Sprayer engine operates but the displacement pump does not, first ensure that the pressure control switch is turned ON. Then, check the pressure setting and increase it by turning the pressure adjusting knob clockwise. Inspect the fluid filter for dirt and clean if necessary. Also, verify that the tip or tip filter isn't clogged and clean it if needed.
R
robert17Sep 7, 2025
What to do if the engine of my Graco Paint Sprayer operates, but the displacement pump does not operate?
- A
  Aimee LopezSep 8, 2025
  If your Graco Paint Sprayer's engine runs but the displacement pump doesn't, first ensure the pressure control switch is ON. Then, check if the pressure setting is too low and increase it by turning the pressure adjusting knob clockwise. Also, check the fluid filter and tip/tip filter for any clogs. The displacement pump piston rod may be stuck due to dried paint.

Graco LineLazer II 3900 Specifications

General

Brand	Graco
Model	LineLazer II 3900
Category	Paint Sprayer
Language	English

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