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Spraying Systems GunJet PW4000A User manual

PW4000A GunJet
®
Spray Gun
USER GUIDE
spray.com
MI-PW4000A
2
CONTENTS
INTRODUCTION ..........................................................................................2
WARNINGS & PRECAUTIONS ...................................................................... 3
INSTALLATION ............................................................................................ 5
MAINTENANCE...........................................................................................6
PARTS LIST..................................................................................................8
INTRODUCTION
The Model PW4000A- GunJet is a high-pressure spray gun that offers exceptional
operator control, even at maximum flow and pressure conditions. A bottom pivot
trigger reduces operator fatigue by making trigger pull easier. The shut-off valve is
located in the base of the handle, concentrating heat away from the operator’s hand
and slowing heat build-up. A special trigger lock feature locks in the “off” position to
prevent accidental discharge and retracts flush into the handle when the gun is in use.
The Model PW4000AW- incorporates a continuous “Weep” feature to minimize the
chance of freezing and, with the exception of the valve seat sub-assembly, the
PW4000A- and PW4000AW- GunJet spray guns are identical and require the same
installation and operating procedures. The Model PW4000A- and PW4000AW-
GunJet spray guns with the “S” option have a built-in swivel to reduce operator
fatigue and prolong hose life.
FEATURES OF THE MODEL PW4000A - GUNJET SPRAY GUNS:
•Operating pressure range — up to 4000 psi (275 bar).
•Maximum recommended temperature — 300° F (150° C).
•Forged Brass Inlet Body.
•Stainless Steel shut-off.
•TEFLON®Back-Up Rings.*
•Viton®O-rings.*
•Handle design helps to control reactionary force during trigger actuation.
•Teflon is a registered trademark of DuPont Company
* Viton is a registered trademark of DuPont Performance Elastomers
3
WARNINGS & PRECAUTIONS
IMPORTANT: READ ALL INSTRUCTIONS BEFORE USING SPRAY GUN
THIS IS A HIGH-PRESSURE DEVICE WHICH SHOULD ONLY BE USED IN A
PROPERLY ENGINEERED SYSTEM. THIS SPRAY GUN SHOULD BE OPERATED
ONLY BY TRAINED OPERATORS AND KEPT OUT OF REACH OF CHILDREN.
PLEASE READ THE FOLLOWING INSTRUCTION SHEETS BEFORE ATTEMPTING
TO OPERATE THE PW4000A- OR PW4000AW- HIGH PRESSURE GUNJET SPRAY
GUNS.
HEED ALL THESE WARNINGS or serious and permanent injury may result.
GENERAL WARNING FOR HIGH PRESSURE SPRAY GUNS: IF THE OPERATING
PRESSURE IS BETWEEN 100 PSIG (0.69 MPA) AND 3200 PSIG (22.06 MPA),
THEN AN EXTENSION OR WAND SHOULD BE USED THAT SEPARATES THE
DISCHARGE NOZZLE A MINIMUM OF 29.5 INCHES (750 MM) FROM THE
TRIGGER MECHANISM. DO NOT ASSEMBLE DISCHARGE NOZZLE DIRECTLY
INTO THE SPRAY GUN.
IF THE OPERATING PRESSURE IS BETWEEN 3200 PSIG (22.06 MPA) AND 5000
PSIG (34.48 MPA), THEN AN EXTENSION OR WAND SHOULD BE USED THAT
SEPARATES THE DISCHARGE NOZZLE A MINIMUM OF 4.0 FEET (1.22 M) FROM
THE TRIGGER MECHANISM. DO NOT ASSEMBLE DISCHARGE NOZZLE DIRECTLY
INTO THE SPRAY GUN.
1. DO NOT aim gun at any person or any part of the body. Fluids under
high pressure can penetrate the human skin and can cause severe
injury, possibly resulting in amputation or death. Hot liquids and
chemicals can also cause burns or injury. If any part of the body comes
in contact with the spray stream, immediately consult a physician.
2. DO NOT at any time place hands or any other part of the body in front
of spray nozzle or tip.
3. DO NOT alter equipment in any manner; if repairs are necessary, use
only genuine factory repair parts supplied by Spraying Systems Co.
4. DO NOT exceed maximum operating pressure of the lowest rated
accessory item within the spray system even though some of the
accessories have a higher maximum pressure rating.
5. DO NOT leave equipment under pressure unattended at any time.
Relieve pressure by shutting off power to pump, turning off the liquid
supply to the pump, and actuating Trigger until all fluid ceases to flow;
then position Trigger Lock to the locked position.
4
6. DO NOT use damaged, perforated, or weakened fluid hose.
7. DO NOT use a GunJet® with a faulty or damaged Trigger Lock.
8. DO NOT operate a spray gun if there are any leaks from the packings,
fittings, hoses, etc. Fluids that are under high pressure can penetrate
skin, cloth, etc., and cause serious injury.
9. DO NOT touch any metal parts of the gun or accessories when spraying
hot liquids or severe injury can occur.
10. DO NOT handle a spray gun without a tip or nozzle any differently than
one with a tip or nozzle. Even with the tip or nozzle removed, the spray
gun can discharge a large volume of liquid at a high velocity.
SAFETY SHOULD ALWAYS BE OBSERVED:
1. DO use a two-handed control of PW4000A GunJet at all times. Grasp
spray gun firmly with both hands. If an extension is used, grasp the
extension. (Insulated extension if spraying hot liquids.)
2. DO adopt a secure body stance prior to and during spray operation to
safely control the high reactionary force of this unit.
3. DO impress on other people in the spraying area the importance of
obeying strict safety precautions for everyone’s safety.
4. DO develop a habit of shutting off the power to the pump, relieving
fluid pressure from gun and hose by actuating trigger until all fluid
ceases to flow, and setting the Trigger Lock in the locked position,
before attempting to remove the tip, nozzle, gun or any part of the
gun, or when gun is not in use.
5. DO check operation of Trigger Lock before each spray period. Trigger
Lock must hold the Trigger to its forward position. (Adjust if necessary;
see section Trigger Adjustment Procedure.)
6. DO carefully check and tighten threaded connections regularly. Make
them secure and leak proof.
7. DO flush gun after each spray period using the same safety precautions
as used during spraying operations. Always use the lowest possible
pressure for flushing.
8. DO keep gun clean and dry to allow for positive grip.
5
9. DO use GunJet® in a well-ventilated area and make sure spray gun is
grounded properly when used in a possibly explosive or inflammable
environment. A grounded-type hose should be used.
IMPORTANT: In case of the slightest appearance of skin penetration from
spray, CONSULT A PHYSICIAN IMMEDIATELY!
INSTALLATION
1. Before installing GunJet®to hose, select WashJet®tip or, if desired, an
appropriate extension and WashJet nozzle for your application. Install
on gun with nozzle positioned for your particular spraying needs and
tighten.
2. Make sure all power is turned off to the pump. Attach GunJet to
high-pressure hose with rating to meet or exceed the maximum
operating pressure to be used. When spray gun is being used in a
possible explosive or flammable environment, a grounded-type hose
should be used.
3. Follow your pump and component parts manufacturer’s
recommendations for operation, but in any case, do not exceed
the pressure or temperature of the lowest rated component within the
system.
4. Make sure all power to the pump is turned off and there is no pressure
in any part of the system. Examine all connections, making sure they
are of the proper type and are secure.
5. Before turning on the pump and holding the GunJet in downward
vertical position pointed away from body, familiarize yourself with the
operation of the Trigger Lock (17)
6. Make sure Trigger Lock (17) is in “locked” position. Do not turn on the
pump power or operate spray gun if Trigger Lock is not operating
properly.
6
MAINTENANCE
With proper care, your PW4000A GunJet®will give you reliable service. To
maintain this performance, parts should be inspected regularly and replaced
when necessary with genuine Spraying Systems Co. parts.
DISASSEMBLY PROCEDURE:
(SEE FIGURES 1 & 2 ON PAGE 9)
If it becomes necessary to rebuild the Valve Assembly (3 - 13) order Spare Parts
Kit ABPW4000A-KIT or ABPW4000AW-KIT, follow these steps:
1. Make sure all air, electrical and liquid lines to the pump are turned off.
2. Release all the pressure and liquid (from the hose to GunJet) by
operating Trigger until fluid ceases to flow.
3. Set Trigger Lock (17) in locked position.
4. Remove spray gun from hose.
5. Remove the five Screws (19) and Housing (18). See Figure 1, Page 9.
6. Lift out all internal parts, leaving all parts assembled. Trigger Lock (17)
should remain in Housing (18).
7. Clamp the Valve Body (2) and remove Retaining Screw (4) containing
Gasket (5), Back-Up Ring (6) and O-ring (7). See Figure 2, Page 9.
8. Remove Stem (9), Valve Seat (8) with Back-Up Ring (11) and O-ring (12),
as well as Ball (10) and Spring (13).
PARTS REPLACEMENT/ASSEMBLY PROCEDURE:
(SEE FIGURES 1 & 2 ON PAGE 8)
1. Install new Back-Up Ring (11) and O-ring (12) on new Valve Seat (8).
2. Clamping Valve Body (2) insert the following new parts: Spring (13), Ball
(10) and Valve Seat Sub-Assembly (8, 11 & 12) into Valve Body.
3. NOTE: Cross-drilled holes in Valve Seat (8) should be in line with inlet
of valve body to minimize pressure loss. See “Figure 2”.
4. Remove Gasket (5), O-ring (7), and Back-up Ring (6), from Retaining
Screw (4) and replace with new parts.
7
IMPORTANT: O-RINGS (7 & 12) AND BACK-UP RINGS (6 & 11) MUST BE
INSTALLED IN THE CORRECT POSITION AS SHOWN OR THE SPRAY GUN WILL
LEAK AND PERMANENTLY DAMAGE THE O-RINGS. SEE “FIGURE 2”.
5. Insert new Stem (9) through Retaining Screw Sub-Assembly (4 thru 7),
inserting rounded end through O-ring (7).
6. Install and tighten Retaining Screw Sub-Assembly and Stem into
Valve Body (2) with new Gasket (5).
7. Insert new Spring (3) over Stem (9).
8. Re-assemble into Housing (18).
NOTE: Be careful not to lose Trigger Spring (3).
8
Figure 1
Figure 2
9
PARTS LIST
10
11
12
North Avenue and Schmale Road, P.O. Box 7900,
Wheaton, IL 60187
-7901
Tel: 1.800.95.SPRAY
Intl. Tel: 1.630.665.5000
Fax: 1.888.95.SPRAY
Intl. Fax: 1.630.260.0842
www.spray.com
MI-PW4000A © Spraying Systems Co. 2019

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