PMC PX-7 User manual

Mechanical Purge
Spray & Pour Gun
PX-7
For use with non-flammable Foam and
Polyurea
For professional use only
Not for use in explosive atmospheres
Service Manual
Ref. # MN-04028
Revision2.3
March 2, 2021
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channel, “Polyurethane
Machinery Corporation
PMC”, for video
instructions.
Polyurethane Machinery Corp.
Corporate: 1 Komo Drive, Lakewood, NJ 08701
Manufacturing: 2 Komo Drive, Lakewood, NJ 08701
Phone: [phone]
Fax: [phone]
URL: http://www.polymacusa.com
Before installing the PX-7 Gun and start-up, carefully read all the
technical and safety documentation included in this manual. Pay
special attention to the information in order to know and understand
the operation and the conditions of use of the PX-7 Gun. All of the
information is aimed at improving user safety and avoiding possible
breakdowns from the incorrect use of the PX-7 Gun.

PX-7
TABLE OF CONTENTS
REV 2.3: March 2, 2021 i
Table of Contents
WARRANTY...............................................................................................................................1
SAFETY AND HANDLING .........................................................................................................3
TECHNICAL SPECIFICATIONS.................................................................................................5
GENERAL DESCRIPTION.........................................................................................................6
OPERATION ..............................................................................................................................7
Mixing Module and PCD Installation......................................................................................10
Valving Rod Adjustment........................................................................................................12
Rear Packing Nut Adjustment...............................................................................................13
Air Cap Valve Adjustment .....................................................................................................14
Shutdown Procedure.............................................................................................................14
MAINTENANCE .......................................................................................................................15
Daily Cleaning Procedure......................................................................................................16
TROUBLE SHOOTING GUIDE ................................................................................................18
REFERENCE GUIDE................................................................................................................19
Spray Module Kits.................................................................................................................19
Pour Module Kits...................................................................................................................19
Module Drills.........................................................................................................................19
PCD Sizes ............................................................................................................................19
Torque Specifications............................................................................................................20
Flush Tanks ..........................................................................................................................20
PARTS IDENTIFICATION ........................................................................................................21
Gun Assembly.......................................................................................................................21
Gun Block Assembly.............................................................................................................22
Air Cylinder Assembly...........................................................................................................23
Handle Assembly..................................................................................................................25
Coupling Block Assembly......................................................................................................26
Manual Valve Assembly........................................................................................................27
Spray Module Components...................................................................................................28
Pour Module Components.....................................................................................................29
SPARE PARTS & REBUILD KITS...........................................................................................30
PX-7 Tool Kit.........................................................................................................................30
Cylinder/Piston Rebuild Kit....................................................................................................32
Trigger Rebuild Kit ................................................................................................................32
Gun Block Rebuild Kit, PX-7 .................................................................................................32
Screen Screw Kit, A-Side, PX-7............................................................................................33
Screen Screw Kit, R-Side, PX-7............................................................................................33

PX-7
TABLE OF CONTENTS
REV 2.3: March 2, 2021 ii
1/4” Unheated Stainless Steel Hose Assy. ............................................................................33
PX-7 Spare Parts Kits...........................................................................................................34
Kit List...................................................................................................................................35
SLAB JACKING & CONCRETE POURING COMPONENTS...................................................36
PX-7 Slab Jack Starter Kit.....................................................................................................36
Plastic Packer w/ Sleeve –6 Pack........................................................................................36
Starter Pack, 3/8 Bang-In Pack.............................................................................................37
Table of Figures
Figure 1: PX-7 Dimensions........................................................................................................ 5
Figure 2: PX-7 Overview............................................................................................................ 6
Figure 3: PX-7 Side View........................................................................................................... 6
Figure 4: Safety Stop ................................................................................................................. 7
Figure 5: Closing Manual Valves................................................................................................ 7
Figure 6: Coupling Block Hose Installation................................................................................. 8
Figure 7: Coupling Block Gaskets.............................................................................................. 8
Figure 8: Air Inlet Configuration Options..................................................................................... 9
Figure 9: Turn Forward Stop Clockwise ....................................................................................10
Figure 10: Spray Configuration .................................................................................................11
Figure 11: Pour Configuration...................................................................................................11
Figure 12: Valving Rod Adjustment...........................................................................................12
Figure 13: Rear Packing Nut.....................................................................................................13
Figure 14: Air Cap Valve Adjustment ........................................................................................14
Figure 15: Flush Block Installation.............................................................................................16
Figure 16: Clean Parts..............................................................................................................17
Figure 17: 2.5 Gallon Flush Tank (200426)...............................................................................20
Figure 18: 1 QT Mini Flush Tank (200216)................................................................................20
Figure 19: Kit MA-41 Shown on PX-7........................................................................................33

PX-7
WARRANTY
REV 2.3 : March 2, 2021 1
WARRANTY
Polyurethane Machinery Corporation (hereinafter “PMC”) provides this LIMITED
WARRANTY (hereinafter “Warranty”) to the original purchaser (hereinafter “Customer”) covering
this equipment and the original PMC manufactured accessories delivered with the equipment
(hereinafter “Product”) against defects in material or workmanship of the Product (hereinafter
“Defect” or “Defective”) for a period of one (1) year from the date of first purchase as shown on
the original PMC invoice (hereinafter “Warranty Period”).
If during the Warranty Period under normal use, the Product is suspected by Customer to be
Defective in material or workmanship, it is Customer’s responsibility to contact PMC and return the
Product to PMC as directed by PMC, freight prepaid. If PMC determines that the Product is
Defective and that such Defect is covered by this Warranty, PMC will credit Customer for the
reasonablefreight charges incurred by Customer inreturningthe Defective Product toPMC, and
PMC (or its authorized agent) will, at PMC’s option, repair or replace the Product, subject to
the following:
Original Invoice: The original invoice must be kept as proof of the date of first sale and the
Product serial number. The Warranty does not cover any Product if the Original Invoice appears to
havebeenmodifiedor altered, or when theserialnumber on the Product appears tohave been
altered or defaced.
Product Maintenance: It is the Customer’s responsibility to maintain the Product properly. See
your maintenance schedule and owner’s manual for details. The Warranty does not cover an
improperly maintainedProduct.
Non-PMC ComponentsandAccessories: Non-PMCmanufactured components and accessories
thatareusedintheoperationoftheProductarenotcoveredbythisWarranty.Suchcomponentsand
accessories shall be subject to the warranty offered to the Customer, if any, by the original
manufacturer of such component or accessory.
Other Warranty Exclusions: The Warranty does not cover any Product that PMC determines has
been damaged or fails to operate properly due to misuse, negligence, abuse, carelessness,
neglect, or accident. By way of example only, this includes:
• Normal wear and tear.
• Improper or unauthorized installation, repair, alteration, adjustment or modification of
the Product.
• Use of heating devices, pumping equipment, dispensers, or other parts or accessories with
the Product that have not been approved or manufactured by PMC.
• Use of air tool oil for lubricating the product
• FailuretofollowtheoperatinginstructionsandrecommendationsprovidedbyPMCmaycause
lossordamagetopersonnel,equipment, or workarea.
• Fire, flood, “acts of God,” or other contingencies beyond the control of PMC.

PX-7
WARRANTY
REV 2.3 : March 2, 2021 2
THE WARRANTY DESCRIBED HEREIN IS THE EXCLUSIVE REMEDY FOR THE
CUSTOMER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS, IMPLIED,
STATUTORY OR OTHERWISE, AND THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL
OTHER WARRANTIES ARE HEREBY DISCLAIMED. TO THE FULLEST EXTENT PERMITTED
BY LAW, PMCSHALL NOT BE RESPONSIBLE, WHETHER BASED IN CONTRACT, TORT
(INCLUDING, WITHOUT LIMITATION, NEGLIGENCE), WARRANTY OR ANY OTHER
LEGAL OR EQUITABLE GROUNDS, FOR ANY CONSEQUENTIAL, INDIRECT,
INCIDENTAL, LOST PROFITS, SPECIAL, PUNITIVE OR EXEMPLARY DAMAGES,
WHETHER TO PERSON OR PROPERTY, ARISING FROM OR RELATING TO THE
PRODUCT, EVEN IF PMC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
LOSSES ORDAMAGES.
Non-Warranty Service by PMC: If PMC determines that the suspected Defect of the Product is not
covered by this Warranty, disposition of the Product will be made pursuant to the terms and
conditions of PMC’s written estimate on a time and materials bas is.
Continuing Warranty for Products Repaired or Replaced under Warranty: Following the repair
or replacement of a Product covered by this Warranty, such Product will continue to be subject
to the original Warranty for the remainder of original Warranty Period or for three (3) months from
the repair or replacement date, whichever is longer.
No Rights Implied: Nothing in the sale, lease or rental of any Product by PMC shall be construed
to grant any right, interest or license in or under any patent, trademark, copyright, trade secret or
other proprietary right or material owned by anyone; nor does PMC encourage the infringement
of same.
Exclusive Warranty: This writing is the final, complete, and exclusive expression of the Warranty
covering the Product. Any statements made by PMC, its employees or agents that differ from
the terms of this Warranty shall have no effect. It is expressly understood that Customer’s
acceptance of this Warranty, by performance or otherwise, is upon and subject solely to the
terms and conditions hereof, and any additional or different terms and conditions proposed or
expressed by Customer or anyone, whether in writing or otherwise, are null and void unless
specifically agreed to in writing by an Officer of PMC.

PX-7
SAFETY AND HANDLING
REV 2.3 : March 2, 2021 3
SAFETY AND HANDLING
This chapter contains important information on the safety, handling and use ofyourPX-7 Gun.
Before installing the PX-7 Gun and start-up, carefully read all the
technical and safety documentation included in this manual. Pay
special attention to the information in order to know and
understand the operation and the conditions of use of the PX-7
Gun. All of the information is aimed at improving user safety and
avoiding possible breakdowns from the incorrect use of the PX-
7 Gun.
WARNING! Presents information to alert of a situation that
might cause serious injuries if the instructions are not
followed.
CAUTION! Presents information that indicates how to avoid damage
to the equipment or how to avoid a situation that could cause injuries.
NOTE! Is relevant information of a procedure being carried out.
Careful study of this Manual will enable the operator to know the characteristics of the Gun and
the operating procedures. By following the instructions and recommendations contained, you will
reduce the potential risk of accidents in the installation, use or maintenance of the PX-7 Gun;
you will provide a better opportunity for incident-free operation for a longer time, greater
productivity and the possibility of detecting and resolving problems fast and simply.
Keep this Service Manual for future reference to useful information. If you lose this Manual, ask
for a new copy from your PMC Service Center or go to the company website
(www.polymacusa.com).
The PX-7 Gun has been designed and built for the application of polyurea chemical systems,
polyurethane foam chemical systems and some two-component epoxy systems.

PX-7
SAFETY AND HANDLING
REV 2.3 : March 2, 2021 4
WARNING! The design and configuration of the PX-7 Gun
does not allow its use in potentially explosive atmospheres
or exceeding the pressure and temperature limits described
in the Technical Specifications of this Manual to be
exceeded.
Always use liquids and solvents that are compatible with the PX-7 Gun. If in doubt, consult PMC
Technical Service.
When working with the PX-7 Gun, it is recommended that the operator wear suitable clothing and
elements of personal protection, including, without limitation, gloves, protective goggles,
safety footwear and face masks. Use breathing equipment when working with the Gun in
enclosed spaces or in areas with insufficient ventilation. The introduction and follow-up of safety
measures must not be limited to those described in this Manual. Before beginning to work with
the Gun, a comprehensive analysis must be made of the risks derived from the products to be
dispensed, the type of application and the working environment.
To prevent possible injury caused by incorrect handling of the
materials and solvents used in the process, carefully read the
Safety Data Sheet (SDS) provided by your supplier.
To avoid damage caused by the impact of pressurized fluids, do
not open any connection or perform maintenance work on
components subject to pressure until the pressure has been
completely eliminated.
Use suitable protection when operating, maintaining or being
present in the area where the equipment is functioning. This
includes, but is not limited to, the use of protective goggles,
gloves, shoes and safety clothing and breathing equipment.
The equipment includes components that reach high
temperatures and can cause burns. Hot parts of the equipment
must not be handled or touched until they have cooled
completely.
The equipment sprays high pressure fluids that can lead to fluid
being injected under the skin or eyes. Severe injury could be
incurred. Proper personal protective equipment should be used
in conjunction with training and situational awareness of all
personnel on the job.

PX-7
TECHNICAL SPECIFICATIONS
REV 2.3 : March 2, 2021 5
TECHNICAL SPECIFICATIONS
Maximum Working Pressure:....................................................................3,500 psi (245 Bar)
Required Incoming Air Pressure:........................................................................ 90-125 psi (6.2-8.6 Bar)
Weight (Not including Coupling Block): ................................................................. 4.3 lbs (2.0 kg)
Weight (Including Coupling Block):........................................................................ 5.0 lbs (2.3 kg)
Figure 1: PX-7 Dimensions
Flow Rates of Spray Modules
MODULE #
MODULE KIT
PART #
PRESSURE
(PSI)
OUTPUT
(LB/MIN)
PATTERN DIA.
(IN)
#1 Round
200547
1000
22
22
#3 Round
200549
1000
12
12
#5 Round
200551
1600
16
14

PX-7
GENERAL DESCRIPTION
REV 2.3 : March 2, 2021 6
GENERAL DESCRIPTION
Figure 2: PX-7 Overview
Figure 3: PX-7 Side View

PX-7
OPERATION
REV 2.3 : March 2, 2021 7
OPERATION
CAUTION! When working with the PX-7 Gun or performing
maintenance work, wear suitable safety protection in accordance with
the recommendations and specifications provided by the product
suppliers.
1. Set the Safety Stop to the LOCKED position (see Figure 4).
Figure 4: Safety Stop
2. Ensure the Manual Valves are CLOSED by turning them to the full clockwise position
using supplied 5/16” nut driver. (See Figure 5).
Figure 5: Closing Manual Valves

PX-7
OPERATION
REV 2.3 : March 2, 2021 8
3. Install hose to the Coupling Block (see Figure 6).
Figure 6: Coupling Block Hose Installation
NOTE! The material delivery hoses are color coded Red and Blue. The Red
corresponds to the Isocyanate (A) and the Blue to the Polyol (R). To avoid
connection errors, the (A) and (B) hoses have connections with different
sizes to avoid incorrect connections.
CAUTION! Excessive force closing or opening the Manual Valves may
result in damage to the Manual Valves and/or Coupling Block. Never
use a socket wrench to close the manual valves.
4. Ensure the Coupling Block Gaskets are installed in theGun Block. Replace if necessary
(see Figure 7).
Figure 7: Coupling Block Gaskets

PX-7
OPERATION
REV 2.3 : March 2, 2021 9
5. Connect the Coupling Block to the Gun Block using the Nut Driver provided. Tighten
the Coupling Block until there is a hand tight seal.
6. Connect the Air Hose to the Air Inlet at the back of the Gun, and then connect the Air
Hose to the Supply Air Hose.
Alternatively, remove the Pipe Plug from inside the Gun Handle and replace with the
supplied Pipe Extension. Connect the Air Hose and Adapter to the Pipe Extension,
and then connect the Air Hose to the Supply Air Hose (see Figure 8).
Figure 8: Air Inlet Configuration Options
7. Pull the Trigger several times to check for correct movement of the Valving Rod.
8. Ensure the Proportioner and supply system are in the ready position and all processing
parameters are satisfied per the chemical manufacturer’s specifications.
9. OPEN each Manual Valve by turning three (3) full turns counter clockwise.
10. Set the Safety Stop to the OPEN position.
11. Perform a test spray.

PX-7
OPERATION
REV 2.3 : March 2, 2021 10
Mixing Module and PCD Installation
1. Remove the Coupling Block from the Gun.
2. Flush the Gun Block per the Daily Cleaning Procedure on page 16
3. Remove the Air Cap,PCD Retainer,PCD,Front Packing Retainer with the Front
Packing,and the Mixing Module as applicable
4. Ensure the Air Hose is connected to the Supply Air Hose, and the gun is in the Unlocked
position
5. Push Mixing Module into Gun Block onto Valving Rod (See Figure 10 and Figure 11).
6. Pull and hold the Trigger until after step 8
7. Screw the Front Packing Retainer (with Front Packing for spray applications) onto the
Gun Block until it is hand tight
8. Tighten the Front Packing Retainer with a 5/8” Wrench and release the Trigger
9. If Module has been used previously, skip to step 12, for initial Module install, remove
Front Packing Retainer (with Front Packing if applicable) and Module (pull Trigger to
release Module)
10. Clean out orifices in Module using supplied Drills
11. Reinstall Module and Front Packing Retainer (with Front Packing if applicable)
12. Turn the Forward Stop clockwise (as viewed from the front of the gun) approximately 1-
2 turns (see Figure 9).
Figure 9: Turn Forward Stop Clockwise

PX-7
OPERATION
REV 2.3 : March 2, 2021 11
13. For pour applications, skip this step. For spray applications, install the PCD onto the
Front Packing Retainer and screw the PCD Retainer and Air Cap (See Figure 10).
Figure 10: Spray Configuration
Figure 11: Pour Configuration
14. Adjust Valving Rod per the procedure on page 12.

PX-7
OPERATION
REV 2.3 : March 2, 2021 12
Valving Rod Adjustment
CAUTION! Failure to perform Valving Rod Adjustment Procedure
properly may cause pattern deformation and damage to Valving rod
and/or PCD.
1. Set the Safety Stop to the LOCKED position.
2. Ensure the Manual Valves are CLOSED by turning them to the full clockwise position.
CAUTION! Excessive force closing or opening Manual Valves may
result in damage to the Manual Valves and/or Coupling Block.
3. Remove Coupling Block from Gun
4. Clean Gun per Daily Cleaning Procedure on page 16.
5. Connect the Air Hose to the Supply Air Hose.
6. Loosen the Rear Packing Nut.
7. Loosen Forward Stop Clamp Screw at top of Cylinder.
Figure 12: Valving Rod Adjustment
8. Turn Forward Stop fully counterclockwise to loosen.
9. Slowly tighten Forward Stop by turning clockwise until snug resistance is felt. Then,
loosen 1/6 of a turn (one wrench flat).
10. Hand-tighten Forward Stop Clamp Screw. If Forward Stop Clamp Screw bottoms out
before resistance is felt, replace the plastic pellet in the hole.
11. Tighten Rear Packing Nut until finger tight and turn with wrench one half turn, then adjust
as necessary.

PX-7
OPERATION
REV 2.3 : March 2, 2021 13
Rear Packing Nut Adjustment
1. Rear Packing Nut (see Figure 13)should be initially installed finger-tight, then turned with
a ½” wrench one half turn.
Figure 13: Rear Packing Nut
2. If excessive leaking occurs during operation, adjust Rear Packing Nut with a ½” wrench
as necessary to prevent leakage. Do not overtighten!
CAUTION! Overtightening the rear packing nut can damage the rear
packing and/or cause the Valving Rod to move slowly.
3. If leakage continues, replace Rear Packing (200396).

PX-7
OPERATION
REV 2.3 : March 2, 2021 14
Air Cap Valve Adjustment
1. Experiment with spraying.
2. If excessive overspray is observed and/or spray pattern is not satisfactory, decrease air
flow to Air Cap by turning Air Cap Adjustment Valve clockwise (see Figure 14).
3. If mixed material builds up on PCD, increase air flow to Air Cap by turning Air Cap
Adjustment Valve counter-clockwise.
Figure 14: Air Cap Valve Adjustment
Shutdown Procedure
1. Set the Safety Stop to the LOCKED position and CLOSE the Manual Valves by turning
them to the full clockwise position using the supplied 5/16” Nut Driver.
CAUTION! Excessive force closing or opening Manual Valves may
result in damage to the Manual Valves and/or Coupling Block.
2. Disconnect the air supply.
3. Remove the Coupling Block and clean the Gun per the Daily Cleaning Procedure (see
page 16).

PX-7
REV 2.3 : March 2, 2021 15
MAINTENANCE
To obtain maximum performance from your PX-7 Gun, it is necessary to periodically perform
certain maintenance operations
WARNING! Before proceeding with any maintenance work on
the PX-7 Gun, trigger the gun to remove internal material
pressure, ensure the Manual Valves are CLOSED, ensure the
Gun Lock is in the LOCKED position, and SHUT
OFF/DISCONNECT the air supply. It is recommended to
remove the Gun from the Coupling Block.
To prevent possible injury caused by incorrect handling of the
materials and solvents used in the process, carefully read the
Safety Data Sheet (SDS) provided by your supplier.
To avoid damage caused by the impact of pressurized fluids,
do not open any connection or perform maintenance work on
components subject to pressure until the pressure has been
completely eliminated.
Use suitable protection when operating, maintaining or being
present in the area where the equipment is functioning. This
includes, but is not limited to, the use of protective goggles,
gloves, shoes and safety clothing and breathing equipment.
The equipment includes components that reach high
temperatures and can cause burns. Hot parts of the equipment
must not be handled or touched until they have cooled
completely.
The equipment sprays high pressure fluids that can lead to
fluid being injected under the skin or eyes. Severe injury could
be incurred. Proper personal protective equipment should be
used in conjunction with training and situational awareness of
all personnel on the job.

PX-7
MAINTENANCE
REV 2.3 : March 2, 2021 16
Daily Cleaning Procedure
1. Remove the Coupling Block and install the Flush Block.
Figure 15: Flush Block Installation
2. Ensure the Flush Tank is pressurized (see Flush Tank manual for instructions).
3. Trigger the Gun into a waste container until the solvent or gun cleaner has completely
flushed the system.
4. Remove the Air Cap, PCD Retainer, and PCD.
5. Repeat Flush procedure.
6. Disconnect the Flush Block, lock Safety Stop, and disconnect Air Supply.
CAUTION! Never use air tool oil to lubricate gun. The use of air tool oil
can cause the O-rings to swell and will void the warranty.

PX-7
MAINTENANCE
REV 2.3 : March 2, 2021 17
7. Inspect and clean Gun Block, Air Cap, PCD Retainer, PCD, Mixing Module, Screen
Screws, Screens, and Check Valves.
Figure 16: Clean Parts
8. Use supplied PMC Lubriplate Grease on O-rings and threads.
CAUTION! Never use air tool oil to lubricate gun. The use of air tool oil
can cause the O-rings to swell and will void the warranty.