Pentech MG1003 Guide

Operation and Parts Manual
October 2016, Issue 3
PENTECH MG Gun
Plural Component, Impingement Mix,
Mechanical Purge Spray Gun
Maximum Fluid Pressure –3500 psi (24.5 MPa, 245 Bar)
Air Inlet Pressure Range –80-130 psi. (0.56-0.9 MPa, 5.6-9.0 Bar)
Maximum Fluid Temperature –200ºF (94º C)
Pentech , Inc .
P.O. Box 274, Tallevast, FL 34243 Serial # __________

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Contents
Contents 2
MG Gun Technical Data 3
General Description 4
MG Gun Package Contents 5
Safety Information & Warnings 6
General Operation 7
Whip Hose Attachment 8
Operating Tips –Important 9
Initial Gun Start Up 10
Normal Gun Start Up 11
Module & Pattern Control Disc Details 12
Module and PCD Chart 13
Spraying and Normal Operation 14
Gun Shutdown and Cleaning 15
Troubleshooting 16
Parts Identification Section 17
Main Assemblies 18
Handle Assembly, Exploded View 19
Page Left Blank 20
Handle Assembly Parts List 21
Module & PCD Chart 22
Air Cylinder Assembly, Exploded View 23
Air Cylinder Assembly, Parts List 24
Coupling Block / Whip Hose Assembly 25
Check Valve Assembly, Exploded View & Parts 26
Repair Kits & Tool Kit List 27
Options List 28
Options List Continued 29
Pentech, Inc. Warranty Information 30

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MG Spray Gun
Technical Data
Pressures & Temperatures:
Maximum Fluid Working Pressure 3500 psi (24.5 MPa, 245 Bar)
Minimum Air Inlet Pressure 100 psi. (0.69 MPa, 6.9 Bar)
Maximum Air Inlet Pressure 130 psi. (0.9 MPa, 9.0 Bar)
Minimum Material Output 1 Lbs. /Min. (.4536 kg)
Maximum Material Output 23 Lbs. /Min. (10.43 kg)
Maximum Fluid Temperature 200° F (94ºC)
Hose Connections:
Air Inlet Size ¼”npt Quick Disconnect Nipple
A Component (ISO) Inlet Size ¼” mpt
B Component (Poly) Inlet Size ¼” mpt
Dimensions: Height –6 1/2” (16.51 cm)
Width –2” (5.08 cm)
Length –2 3/4” (6.985 cm)
Weight 1.9Lbs. (.8618 kg)
Wetted Parts: Aluminum, Stainless Steel, Carbon Steel, Teflon, Chemically
Resistant Plastic and O-Rings
Plural Component
Air Operated
Impingement Mixing
Mechanical Purge

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MG Gun
General Description
Item Name
A Trigger Guard
B Air Cap
C Pattern Control Disc (PCD)
D Manual on/off Valve
E Check Valve
F Whip Hose, Resin
G Whip Hose, ISO
H Whip Hose, Air
I Air Safety Valve
J Air Needle Valve
K Trigger Paddle

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The MG Spray Gun Package
Includes
MG1003 MG Spray Gun Package
Includes:
MG2100 MG Gun Assembly Complete
MG5300 Coupling Block / Whip Hose Assembly
MG9000 Tool Kit
Includes: 1 BD9054 Flush Bottle
1 PSG9012 Drill Bit, 7/64” x 6” Long
1 PSG9010 Combination Wrench, 5/16”
1 PSG9009 Nut Driver, 5/16”
1 PSG9011 Pin Vise
1 MG9014 Drill Bit, 1/16”
4 MG4003 O-Ring, Coupling Block
3 PSG2008 O-Ring
MG100 Manual, Operation and Parts Identification
Note: MG Gun package comes ready to spray with:
MG9001-24 –(Module, Mix, Round Pattern, .024)
MG9003-24 –(PCD, Round Pattern, .024)

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Safety Information & Warnings
Before operating The MG Spray Gun, personnel should fully
understand the contents, recommendations, and safety notes
contained in this manual.
Failure to follow these guidelines may result in severe bodily injury
or damage to equipment and property.
The safety guidelines outlined in this manual are not intended to be
all inclusive. A certain degree of knowledge of general industrial
safety practices as used in the spray applied coatings and foam
industry are required to insure operator safety.
Aluminum Parts Hazard
Do Not Use 1,1,1-Trichloroethane, Methylene Chloride, or other
halogenated hydrocarbon solvents, or fluids containing these
solvents in the MG Gun. These solvents are capable of causing a
serious chemical reaction, and possible rupture when used in
pressurized aluminum equipment.
Personal Protection
The operator and personnel in the vicinity of this equipment must
ensure their personal safety by wearing:
Protective eyewear
Protective clothing and gloves
Protective breathing apparatus, supplied fresh air system, or
approved respirator.
Injection Hazard:
This equipment operates at high fluid pressure and is capable of
injecting chemicals into skin.
Do not place hands or fingers in area of spray pattern.
Never point spray gun in the direction of other personnel.
Close material supply valves before leaving spray gun
unattended.
Relieve all pressure before servicing or cleaning this
equipment. If chemicals have pierced skin, get immediate
medical attention.
Chemical Materials and Fumes: Read and understand Material
Safety Data Sheet (MSDS) provided by chemical manufacturer.
Store and dispose of chemicals in accordance with manufactures
guidelines.

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GENERAL OPERATION OVERVIEW
GUN SAFETY DEVICES:
The MG Gun has two methods of putting the gun in the safe mode.
# 1. Air Valve:
Gun will not trigger without air pressure to the air cylinder.
To engage air valve safety, turn air valve handle clockwise.
Air needle valve will vent air contained in gun handle and air
cylinder.
# 2. Material Shut Off Valves:
Gun will not dispense material with A & B manual valves
closed.
To engage manual valve safety, turn manual valves
clockwise until closed.
Hose Orientation:
With gun pointing away from operator, Acomponent hose and
manual valve is on operators left. Bcomponent hose and manual
valve is on operator’s right.
Air Hose Connection:
Insure that air valve at rear of air Cylinder is in the closed/safe
position.
Air hose is connected by inserting male quick disconnect fitting
located at end of air whip hose into female quick disconnect air
fitting located in heated hose bundle. When gun is not in use, keep
air fitting free of debris.
Coupling Block:
The A & B material whip hoses are connected to the gun head by
the coupling block bolt.
Insure that the two coupling block o-rings are in place.
Material Shut Off Valves:
The A & B manual valves control the on/off flow of material to the
gun. Open valves 2 turns when spraying.
Do not open manual valve unless the gun is connected, or the
coupling block material ports are directed into a suitable container.

8

9
Important Tips for Operation
Air cap and mating front face of gun must be very clean and free of
nicks.
Air cap bolts must be greased and tightened with wrench until tight.
Consult your material supplier for the proper cleaning and flushing
solvent to use.
Ensure that cleaning solvents do not cause swelling of o-rings.
Do not soak o-rings or mix module in solvent. Solvent may be used
for cleaning, and then dried off.
Air cap clean off air should remain on whenever manual valves are
open.
Do not submerge entire gun in cleaning solvent. O-Ring damage
will result.
Lubricate air line inlet daily, 2-3 drops of air tool oil only.
Apply light coat of grease or wax to exterior of gun daily to prevent
overspray build up.

10
Initial Gun Start Up
Install Coupling block / Whip hose assembly to heated hose set:
1. Attach Coupling block / whip hose assembly to existing hose
assembly using either adapter fittings, or adapter blocks. See page
8. Check to see that A & B material shut off valves are closed.
2. Turn on hose heat and machine heaters. Set temperature, and
allow machine to reach spray temperature.
3. Pressurize equipment, bleed air from coupling block/ whip hose
assembly into suitable waste container. Equalize A and B
component pressure gauges at correct spray pressure.
Assemble MG spray gun:
1. Check to see that basket filters and coupling block o-rings are in
place.
2. Apply light coat of grease or wax to gun to prevent overspray from
sticking.
3. Attach gun to coupling block using 5/16” nut driver.
4. Plug in air supply whip hose, open air / safety valve at rear of gun.
5. Open pattern air valve ¼ - ½ turn.
6. Slowly open A & B material shutoff valves 1 ½ turns. Check for
material mist in pattern or leakage at air cap.
Gun is now ready to spray. Aim off target, spray off target until good
pattern develops.

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Normal Gun Start Up
Assemble MG spray gun:
1. With air cap, PCD, and mix module removed, use solvent squeeze
bottle to ensure that basket filter ports and ports to mix module seat
are clean and open. A drill of the proper diameter can be used to
clear build-up that may be present.
2. Check ports in mix module to ensure they are clean. See Page 13
for details on drilling the mix module.
3. Wipe grease around module seat area. Use excess to apply a light
coat to the outside of the mix module.
4. Push small end of module over end of valving rod. Carefully align
module locating pin with groove in module seat ring. Push module
fully into seat area. Recheck alignment of pin in slot.
5. Check to see that the orifice in the PCD is clean. Orifice may be
cleaned with proper drill size. See page 13. Apply light coat of
grease to PCD. Put PCD into place over large end of mix module.
6. Install air cap and 2 lightly greased bolts over PCD. Tighten until
very snug using 5/16” combination wrench. Apply light coat of
grease to front of air cap.
7. Plug in air supply whip hose, open air / safety valve at rear of gun.
8. Open pattern air valve ¼ - ½ turn. Trigger gun to check for proper
operation.
9. Slowly open A & B material shutoff valves 1 ½ turns. Check for mist
in pattern or leakage at air cap.
10. Check for leakage at rear seal packing nut. Nut should be only tight
enough to prevent leakage. Do not over tighten.
Gun is now ready to spray. Aim off target, spray off target until good
pattern develops.

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13
Module / PCD Chart
PART Approx. Output Number Cleanout
Item # NUMBER DESCRIPTION Pattern At 24" Drill Size Drill Size
20 MG9001-16 Module, Mix Rnd Pattern, 016 1.0 - 2.0 Lbs/Min 78 .016
13 MG9003-20 PCD, Round Pattern, .020 4-6" 76 .020
20 MG9001-16 Module, Mix, Rnd Pattern, .016 1.25-2.0 Lbs./Min. 78 .016
13 MG9003-24 PCD, Round Pattern, .024 4-6" 73 .024
20 MG9001-24 Module, Mix, Rnd Pattern, .024 2.5 - 4.0 Lbs./Min. 73 .024
13 MG9003-24 PCD, Round Pattern, .024 4-6" 73 .024
20 MG9001-24 Module, Mix, Rnd Pattern, .024 2.5 - 4.0 Lbs./Min. 73 .024
13 MG9003-36 PCD, Round Pattern, .036 5-8" 64 .036
20 MG9001-37 Module, Mix, Rnd Pattern, .037 10 - 18 Lbs./Min. 63 .037
13 MG9003-47 PCD, Round Pattern, .047 12-16" 3/64 .0469
20 MG9001-52 Module, Mix, Rnd Pattern, .052 18 - 25 Lbs./Min. 55 .052
13 MG9003--60 PCD, Round Pattern, .060 14-21" 53 .0595

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Spraying and Normal Operation
Note: The MG Gun comes standard with 24” unheated whip
hoses. Their purpose is to limit operator fatigue by providing more
flexibility, as well as saving the wear and tear on the more
expensive heated whip hose assembly.
Due to the small amount of unheated material in the whip hoses, it
may take a moment for the spray pattern to fully develop when first
triggered. Subsequent triggering will yield a good pattern instantly.
If this delay is an issue, heated whip hoses may be attached
directly to the MG coupling block with fittings listed on page 8.
Start by spraying off target to check pattern.
Hold spray gun perpendicular to work surface whenever possible.
Overlap round pattern by approximately 1/3 for even application of
coatings or foam.
Due to the direct impingement mixing of the MG gun; it may be
triggered while aiming at the project surface without producing an
Iso spit, or off ratio material condition.

15
Gun Shutdown and Cleaning
Removing MG gun from coupling block:
1. Close A & B material shutoff valves.
2. With pattern air still on, trigger gun into waste bucket
repeatedly to relieve pressure in material ports.
3. Turn off Pattern air valve.
4. Remove gun from coupling block.
Cleaning:
1. Remove 2 bolts and air cap.
2. Remove PCD from air cap. Trigger gun to push out
module. Air Safety valve can now be closed, and air
hose disconnected from gun.
3. Using flush bottle, clean module ports by blocking one
end of module with finger, and squirting solvent in
open end until it comes out both ports. Clean outside
of module. Store dry.
4. Remove 2 coupling block o-rings, clean and store dry.
Remove basket filters from gun and clean in solvent.
Using flush bottle, flush solvent thru each basket filter
port until solvent comes out of material port in module
seat area. Repeat for other side. Gun should be held
at an angle to prevent solvent from flooding the trigger
area.
5. Clean exterior of gun with solvent rag.
Note: To clean overspray from gun, a rag may be wrapped around
gun which has been soaked in suitable solvent, to soften overspray.
Do not immerse gun in solvent to clean.
O-rings in trigger spool valve and air cylinder will be
damaged.

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Troubleshooting
PROBLEM
CAUSE
SOLUTION
Very slight air leakage at sides of air
cap.
This is normal.
No action required.
Valving rod does not actuate.
No air pressure.
Low air pressure.
Rear seal packing nut to
tight.
Connect air, open air safety valve.
Set air pressure to 80-130 psi.
Loosen packing nut slightly.
Mist from PCD when not triggered.
Air cap bolts loose.
Rear surface of air cap
dirty.
Module bore worn out.
Tighten air cap bolts with wrench.
Clean, check for nicks.
Replace worn module.
Excessive overspray.
Excessive air flow to air
cap.
Fluid pressure set to high.
Reduce air flow with needle valve.
Reduce fluid pressure.
Round pattern has fingers, or is
misshaped.
PCD orifice dirty.
PCD orifice worn.
Material pressure too low.
Clean PCD orifice with proper clean
out drill.
Replace PCD.
Increase material pressure.
Pressure imbalance.
Module ports dirty.
Module ports worn.
A & B viscosities not equal.
Basket filters dirty.
Check valves dirty.
Clean module ports using proper
drill size.
Re drill module ports to next larger
drill size.
Adjust temperatures of A & B.
Clean basket filters.
Clean or replace check valve.
Gelled, or hardened material in air
passages feeding air cap.
Material crossover, air in
hoses.
Clean, or replace check valves.
Clean material ports with drill.
Material leakage at rear seal.
Rear seal packing nut
loose.
Rear seal worn or
damaged.
Tighten packing nut slightly.
Replace rear seal.
Rapid material buildup on PCD or air
cap.
Insufficient air flow to air
cap.
Increase air flow to air cap.
Gun triggers slowly.
O-rings dry, or worn.
Lubricate gun with air tool oil in air
inlet, or replace and lubricate o-
rings.
Air Leakage from exhaust under
Trigger paddle.
Damaged spool valve o-
rings.
Damaged piston o-ring.
Replace spool valve o-rings.
Replace piston o-ring.

17
Parts Identification
Section

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Page Intentionaly Left Blank

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MG2000
Handle Assembly Complete