Spraying Systems GunJet AA27H User manual

AA27H GunJet
®
Spray Gun
USER GUIDE
spray.com
MI-AA27H

2
CONTENTS
CONTENTS............................................................................................................ 2
INTRODUCTION.................................................................................................... 2
WARNINGS & PRECAUTIONS ............................................................................... 3
INSTALLATION...................................................................................................... 5
MAINTENANCE..................................................................................................... 6
PARTS LIST.......................................................................................................... 10
RECORDS / NOTES.............................................................................................. 11
INTRODUCTION
The Model AA27H-- GunJet® Spray Gun is a high-pressure spray gun which
features a heat resistant aluminum alloy handle that remains comfortable even
while spraying high temperature liquids. The comfortable trigger grip remains
responsive and easy to operate even at maximum flow and capacity conditions.
As a safety feature, a Trigger Guard and special Safety Lock, which locks the
trigger in the “off” position, help to prevent accidental discharges. The Model
AA27H-- GunJet will accommodate standard Spraying Systems Co. accessories
for both the inlet and the outlet connections, within the accessories pressure
and temperature limitations. For additional information, see our Industrial
Catalog or your nearest Spraying Systems Co. representative.
Features of the Model 27H GunJet Spray Guns:
•Operating pressure range - up to 1000 psi (69 bar)
•Flow capacities to 5 GPM (19 I/min)
•Maximum recommended temperature – 200° F (93° C)
•Inlet body - single piece, forged brass-nickel plated (for AA27H)
- stainless steel (for AA27H-SS)
•Shut-off needle assembly - stainless steel and brass (for AA27H--)
- stainless steel (for AAM27H-SS)
•Valve seat - brass and carbon-filled PTFE (for AA27H--)
stainless steel and carbon-filled PTFE (for AA27H-SS)
bronze-filled PTFE valve seat
•Buna-N stem seal
•Safety lock ... secures trigger in “Off” position

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 AA27-- HIGH PRESSURE GUNJET SPRAY GUN.
SPRAYING SYSTEMS CO. STRONGLY RECOMMENDS THE USE OF APPROPRIATE
SAFETY EQUIPMENT WHEN WORKING WITH POTENTIALLY HAZARDOUS
CHEMICALS. THIS EQUIPMENT INCLUDES, BUT IS NOT LIMITED TO, A
PROTECTIVE HAT, SAFETY GLASSES OR FACE SHIELD, CHEMICAL RESISTANT
GLOVES, LONG-SLEEVED SHIRT, LONG PANTS, AND A CHEMICAL RESISTANT
APRON. REMEMBER TO READ THE CHEMICAL MANUFACTURER'S LABEL AND
FOLLOW ALL DIRECTIONS.
HEED ALL THESE WARNINGS or serious and permanent injury may result.
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 hand or any other part of the body in front
of a 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 exceeds 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 leaves equipment under pressure unattended at any time. If a
pump is used, relieve line pressure by shutting off power to pump,
turning off the liquid supply to the pump, and actuating the trigger
until all fluid ceases to flow. If gun assembly is equipped with trigger
lock ring; then position trigger lock to the “locked” position.
6. DO NOT use a GunJet® with a faulty or damaged Safety Lock.
7. DO NOT use damaged, perforated, or weakened fluid hose.

4
8. DO NOT operate a spray gun if there are any leaks from the packings,
fittings. hoses. etc. Fluids which 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 AA27H-- GunJet® at all times. Grasp
spray gun firmly with both hands.
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 Safety Lock before each spray period. Safety
Trigger Lock must hold the Trigger to its forward position. (Adjust if
necessary - see section, “Safety Lock Adjustment” on page 7.)
6. DO keep gun clean and dry to allow for positive grip.
7. DO carefully check and tighten threaded connections regularly. Make
them secure and leak proof.
8. DO flush fun after each spray period, using the same safety
precautions as used during spraying operations. Always use the lowest
possible pressure of flushing.
9. DO use spray gun 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!!

5
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 tip or 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 is turned off to the pump, 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 Safety Lock (14).
6. Make sure Safety Lock (14) is in "locked" position. Do not turn on the
pump power or operate spray gun if Safety Lock is not operating
properly.

6
MAINTENANCE
With proper care, your AA27H-- 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. (Parts Kit #AB27H-
Kit-Spare (for 27H) and # AB27H-SS-Kit-Spare (for 27H-SS)).
DISASSEMBLY PROCEDURE: (See Fig. 1 and Parts List PL27H)
If it becomes necessary to disassemble this unit, follow these steps:
1. Make sure all air, electrical and liquid lines 10 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 Safety Lock (14) in locked position.
4. Remove gun from hose.
5. Unlock trigger and pull back slightly. Remove Cap (1), Spray Tip (2) and
Valve Seat (3).
6. Remove Locknut (18) and Washer (19).
7. Carefully pull Inlet Body Sub-assembly (4 thru 10) out of Body (17). Do
not lose Key (6). To disconnect Trigger Guide (10) from Trigger Rivet
(22), tilt Inlet Body Subassembly slightly.
8. Remove Collar (11) from Body (17).
9. Using flats on Inlet Body (5), place Inlet Body Sub-assembly
(4 thru 10) in vise.
10. With a wrench on Stem Nut (9) and Trigger Guide (10), remove Trigger
Guide. Remove Stem Nut (9).
11. To remove Main Stem Assembly (4), push threaded end of Main Stem
Assembly (4) forward. Gently pull Main Stem Assembly out of Inlet
Body (5) being careful not to damage Cup Packing (7).
12. Remove Packing Screw (8) and Cup Packing (7) from Inlet Body (5).

7
To remove item 12 thru 16:
13. Remove Trigger Guard (21).
14. Loosen, but do not remove, Set Screw (15).
15. Pull Trigger (20) forward and remove Safety Lock Screw (13) with
Spring Stud (12) and Safety Lock Cam (14). Remove Spring (16).
ASSEMBLY PROCEDURE: (See Figure 1 and Parts List PL27H)
If item 12 thru 16 were removed:
1. Pull Trigger (20) forward and install Spring (16) into Body (17). Install
Safety Lock Screw (13) with Spring Stud (12) and Safety Lock Cam (14).
2. Tighten Set Screw (15).
3. Install Trigger Guard (21).
4. See "Safety Lock Adjustment" on page 7 after gun
is fully assembled.
FIGURE 1

8
MAIN ASSEMBLY:
1. Insert Main Stem Assembly (4) through Inlet Body (5).
2. Apply a thin coat of light oil on Cup Packing (7). Carefully
"screw" Cup Packing over threads of Main Stem Assembly
(4) and slide onto stem.
IMPORTANT: Cup Packing (7) must be installed in correct direction
(see Fig. 1a).
3. Thread Packing Screw (8) into Inlet Body (5). Hold Inlet Body in vise
and tighten Packing Screw (8) with wrench. Remove from vise.
4. Thread Stem Nut (9) all the way onto Main Stem Assembly (4). Be sure
to install Stem Nut with recess facing away from Inlet Body.
5. Screw Trigger Guide (10) onto Main Stem Assembly (4) until Stem
thread is flush with end of Trigger Guide. While holding Trigger Guide
(10) with wrench, tighten Stem Nut (9) against Trigger Guide. Rotate
Stem Assembly so that opening Trigger Guide faces down. Pull Stem
out until stop.
6. Install Collar (11) into Body (17).
7. Install Key (6) onto Inlet Body Sub-assembly (4 thru 10).
8. While holding Washer (19) and Locknut (18) in place at Body (17),
insert Inlet Body Sub-assembly (4 thru 10) thru hole in Body (17),
Washer (19) and Locknut (18). Tilt Inlet Body Sub-assembly slightly and
engage Trigger Guide (10) over Trigger Rivet (22). Finish inserting Inlet
Body Sub-assembly into Body (17).
9. Install Washer (19) over Inlet Body. Attach and tighten Locknut (18).
10. With Safety Lock (14) in "open" position, pull back on Trigger (20).
Install Valve Seat (3), Spry Tip (2) and Cap (1). Release Trigger.
11. Rotate Safety Lock (14) into "locked" position. There should be no
stem movement. If stem movement occurs, re-adjust Safety Lock: See
"Safety Lock Adjustment".
REPLACEMENT OF CUP PACKING (7):
Steps 1 thru 12 of Disassembly procedure and steps 1 thru 11 of
Assembly Procedure.

9
SAFETY LOCK ADJUSTMENT:
The operation of the safety lock should be checked before each spray period
or after a disassembly/reassembly procedure has been performed. Under no
circumstances should this spray gun be operated with an incorrectly adjusted
safety lock.
The Safety Lock (14) is correctly adjusted when there is no stem travel with
Safety Lock is in the "locked" position and trigger operation is attempted. A
visual check can be made by detecting no Stem Nut (9) movement while pulling
Trigger. If movement occurs, follow steps below:
1. Loosen Set Screw (15) in Safety Lock Cam (14).
2. Take a half turn on Safety Lock Screw (13) in a clockwise direction so
that the flat sides are parallel to the sides of the Trigger (20).
3. Rotate Safety Lock Cam (14) counter-clockwise (in the "open"
position) as far as it will go. Tighten Set Screw (15).
4. Rotate Safety Lock clockwise (to the "locked" position) and test Trigger
(20). If no movement occurs, Safety Lock is properly adjusted. If
Trigger moves, repeat steps 1, 2 and 3 above.

10
PARTS LIST

11
RECORDS / NOTES
DATE:
DESCRIPTIONS

12
North Avenue and Schmale Road,
P.O. Box 7900,
Wheaton, IL 60187
-7901
Tel: 1.800.95.SPRAY
Intl. Tel: [phone]
Fax:
1.888.95.SPRAY Intl. Fax: [phone]
www.spray.com
MI
-AA27 © Spraying Systems Co. 2019