Marco BLASTMASTER 123P User manual

Before using this equipment, read, understand and follow all instructions
in the Operator’s Manuals provided with this equipment. If the user and/
or assistants cannot read or understand the warnings and instructions,
the employer of the user and/or assistants must provide adequate and necessary training to
ensure proper operation and compliance with all safety procedures pertaining to this equipment. If
Operator’s Manuals have been lost, please visit www.marco.us, or contact Marco at 563.324.2519
for replacements. Failure to comply with the above warning could result in death or serious injury.
OPERATOR’S MANUAL
BLASTMASTER®123P
REMOTE CONTROL SYSTEM

Blastmaster®123P Remote Control System
1
Company Profile
Since 1944, Marco has developed a strong tradition of providing innovative and reliable products and services to the
surface preparation and protective coatings industries. We are the world's premier provider of Abrasives, Blasting
Equipment, Coating and Painting Equipment, Engineered Systems, Rental Equipment, Safety Equipment,
Service, and Repair.
Through innovative designs and a total commitment to quality, Marco manufactures products that increase production
rates, create a safer workplace, and reduce maintenance costs. Marco’s industry experience, manufacturing
capabilities, legendary customer service, product availability, logistics services, and technology leadership is your
assurance that we deliver high quality products and services, providing the best value to you, our customer.
The Marco Difference
• Industry Experience – With Marco on your team, you have access to expertise which can only come from over
65 years of industry leadership. We have organized our engineering department, production specialists, customer
operations, and safety support into a “Center of Competence.” As a Marco customer, you have access to hundreds
of years of cumulative experience related to your operations.
• Manufacturing Excellence – Marco is a U.S. based, ISO 9001:2008 certified manufacturer of equipment for the
Surface Preparation and Protective Coatings industries. Marco’s engineers benchmark the industry to ensure that
we design and manufacture superior products that set the “Gold Standard” for performance, safety, and quality.
• Legendary Customer Service – Marco’s legendary customer service team is staffed by friendly, highly-trained
individuals who are focused on providing the highest level of product support, order accuracy, and customer
satisfaction.
• Product Availability – We stock over 10,000 SKU’s and have over 45 shipping locations to serve North American
and International markets for all major brands of blasting and painting equipment. As the largest provider of surface
preparation and protective coatings equipment in the world, our inventory levels and product availability are
unmatched.
• Logistics Services – Marco’s in-house logistics team is dedicated to moving your shipment anywhere in the world.
We move over 14,000 truckloads every year, allowing you to save on freight costs by leveraging our buying power.
Lower your process costs with a single invoice, which includes product and freight.
• Technology Leadership – Our website provides: Operator’s Manuals, Part Numbers and Schematics Guides,
MSDS information, and Features, Advantages, and Benefits Guides, providing access to information 24/7. Our
Extranet application allows you to receive quotes and place orders online. Our Intranet maintains a complete record
of your purchase history to assist with ongoing support of your existing equipment and future purchasing decisions.
Vision Statement
Marco is the world’s premier provider of Abrasives, Blasting Equipment, Coating and Painting Equipment,
Engineered Systems, Rental Equipment, Safety Equipment, Service, and Repair.
Mission Statement
Marco provides strong leadership and innovation to the surface preparation and protective coatings industries We dedicate
our efforts to the continuous improvement of our products, services, processes, people, and most importantly, the quality of
our customer’s experience.
Quality Statement
Marco is committed to providing superior quality in the design, manufacturing, distribution, rental, service, and repair of our
products. Our ISO 9001:2008 certification extends throughout all operations in all locations. Continuous improvement of our
processes and supply chain Integration comprise the core of our business strategy for delivering exceptional quality and
value in all Marco products and services.
Management Philosophy
We are a company dedicated to the success of every customer and associate. We discuss, debate, challenge, measure,
and test our ideas. We will be boundless and limitless in our passion to improve. Through sound leadership and dedicated
associates, we will ensure a long term, profitable future for Marco, our associates, customers, and suppliers.

Blastmaster®123P Remote Control System 2
DEFINITION OF TERMS
This is an example of a warning. This indicates a
potentially hazardous situation which, if not avoided,
could result in death or serious injury.
This is an example of a notice. This indicates policy
or practice directly related to safety of personnel or
protection of property.
This is an example of danger. This indicates an
imminently hazardous situation which, if not
avoided, will result in death or serious injury.
This is an example of a caution. This indicates
a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It
can also be used to alert against unsafe practices.
Definition of Terms
Company Prole ........................1
Denition of Terms .....................2
Hazard Identications ................ 3-6
Air & Abrasive Consumption Chart ......6
Daily Pre-operation Checklist ......... 7-8
Blastmaster®123P Remote
Control System ......................9-18
Description ..........................9
Operating Requirements ................. 9
Operating Instructions .................9-10
Before Use........................... 9
During Use........................... 9
After Use ............................ 9
Installation .........................11-12
Maintenance ........................13-14
Disassemble and Assemble
Tandem Remote Control Valve .......13-14
Troubleshooting .....................15-16
Assembly Part Numbers & Schematics ...17-18
Blastmaster®123P Remote Control
System ............................ 17
Tandem Remote Control Valve .......... 18
Maintenance Notes.................19-21
Warranty...............................22
Disclaimer of Warranty .................22
Exclusive Remedies for Warranty Claims....22
Limitation of Remedies.................22

Blastmaster®123P Remote Control System
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HAZARD IDENTIFICATIONS
Breathing dust containing silica could cause silicosis, a fatal lung disease. Breathing dust during abrasive blasting
operations, post-blast cleaning operations, and/or servicing equipment within the abrasive blasting area may
expose an individual to conditions that could cause asbestosis, lead poisoning and/or other serious or fatal
diseases. Harmful dust containing toxic material from abrasives or surfaces being abrasive blasted can remain
suspended in the air for long periods of time after abrasive blasting has ceased. A NIOSH-approved,
well-maintained, respirator designed for the specific operation being performed must be used by anyone
abrasive blasting, handling or using the abrasive, and anyone in the area of the dust.
Contact NIOSH and OSHA offices to determine the proper respirator for your specific application. The air supplied
to the respirator must be at least Grade D quality as described in Compressed Gas Association Commodity
Specification G-7.1 and as specified by OSHA Regulation 1910.134. Ensure air filter and respirator system hoses
are not connected to non-air sources or in-plant lines that may contain nitrogen, oxygen, acetylene or other
non-breathable gases. Before removing respirator, use an air monitoring instrument to determine if the
atmosphere is safe to breathe.
You must comply with all OSHA, local, City, State, Province, Country and jurisdiction regulations, ordinances and
standards, related to your particular work area and environment. Keep unprotected individuals out of the work
area.
Abrasive blasting operators must receive thorough training on the use of abrasive resistant attire which includes:
supplied-air respirator, abrasive blasting suit, safety shoes, gloves, ear protection and eye protection. Protect the
operator and bystanders by complying with NIOSH and OSHA Safety Standards.
Inspect all equipment for wear or damage before and after each use. Failure to use Original Equipment
Manufacturer repair parts and failure to immediately replace worn or damaged components could void warranties
and cause malfunctions.
OSHA requires abrasive blasting nozzles be equipped with an operating valve, which shall be designed to be
held open only by continuous hand pressure and shall close immediately upon release of hand pressure (i.e., a
“deadman” control). The valve shall not be modified in any manner that would allow it to remain open without the
application of continuous hand pressure by the operator. Failure to comply with the above warning could result in
release of high speed abrasive and compressed air resulting in death or serious injury. OSHA 29CFR 1910.244(b)
Point the abrasive blasting nozzle only at the surface being abrasive blasted. Never point the abrasive blasting
nozzle or abrasive stream at yourself or others.
Unless otherwise specified, maximum working pressure of abrasive blasting pots and related components must
not exceed 125 psi. Exceeding maximum working pressure of 125 psi could cause the abrasive blasting pot and
components to burst. Failure to comply with the above warning could result in death or serious injury.
Never weld, grind or drill on the abrasive blasting pot (or any pressure vessel). Doing so will void ASME
certification and manufacturer’s warranty. Welding, grinding or drilling on the abrasive blasting pot (or any pressure
vessel) could weaken the vessel causing it to burst. Failure to comply with the above warning could result in death
or serious injury. (ASME Pressure Vessel Code, Section VIII, Division 1)
This equipment is not intended for use in any area that might be considered a hazardous location, as described
in the National Electric Code NFPA 70, Article 500. Use of this equipment in a hazardous location could cause an
explosion or electrocution.
Never hang objects from the abrasive blasting pot handle. Doing so may cause the abrasive blasting pot to
become unstable and tip over.
Never attempt to move an abrasive blasting pot containing abrasive. Never attempt to manually move abrasive
blasting pots greater than 6.5 cubic foot capacity. Always use at least two capable people to manually move an
abrasive blasting pot on flat, smooth surfaces. A mechanical lifting device must be used if an abrasive blasting pot
is moved in any other manner.
The use of this product for any purpose other than originally intended or altered from its original design is
prohibited.

Blastmaster®123P Remote Control System 4
HAZARD IDENTIFICATIONS
Failure to comply with ANY WARNING listed below could result in death or serious injury.
This product is not for use in wet environments. Always use a Ground Fault Interrupter Circuit (GFIC) for
all electrical power source connections. Use of this product in wet environments could create a shock or
electrocution hazard.
Frozen moisture could cause restrictions and obstructions in pneumatic control lines. Any restriction or
obstruction in the pneumatic control lines could prevent the proper activation and deactivation of the remote
control system, resulting in the release of high speed abrasive and compressed air. In conditions where moisture
may freeze in the control lines an antifreeze injection system approved for this application can be installed.
Do not cut, obstruct, restrict or pinch pneumatic control lines. Doing so could prevent the proper activation and
deactivation of the remote control system, resulting in the release of high speed abrasive and compressed air.
Use of Marco remote control switches with other manufacturer’s remote control systems could cause unintended
activation of remote control systems resulting in the release of high speed abrasive and compressed air. Only
Marco remote control switches should be used with Marco remote control systems.
Always be certain to have secure footing when abrasive blasting. There is a recoil hazard when abrasive blasting
starts that may cause user to fall and misdirect the abrasive stream at operator or bystander.
Never use an abrasive blasting pot or attachments as a climbing device. The person could slip and fall. The
abrasive blasting pot could become unstable and tip over.
For equipment manufactured by entities other than Marco, you must consult the Original Equipment Manufacturer
operator’s manuals, information, training, instructions and warnings, for the proper and intended use of all
equipment.
Flammable fumes, such as solvent and paint fumes in the work area can present an ignition or explosion hazard
if allowed to collect in adequate concentrations. To reduce conditions that could result in a fire or an explosion,
provide adequate ventilation, eliminate all ignition or spark sources, keep the work area free of debris, store
solvents and solvent contaminated rags in approved containers, follow proper grounding procedures, do not
plug/unplug power cord or turn on/off power switches when flammable fumes are present, keep a working fire
extinguisher or provide another fire suppression system in the work area. Cease all operations and correct
condition if a spark or ignition source is identified during operation.
Always depressurize the entire system, disconnect all power sources and lockout/tagout all components before
any maintenance or troubleshooting is attempted. Failure to comply with the above warning could cause electrical
shock and inadvertent activation of equipment resulting in death or serious injury.
Moving parts can present an area where crushing, pinching, entanglement or amputation may occur. Do not
place body parts or foreign objects in any area where there are moving parts.
Surfaces of heated supply tanks, drums and/or lines as well as the adjoining plumbing may become hot during
normal use. Do not touch these heated surfaces without proper protection. Deactivate and allow sufficient time for
all surfaces to cool before attempting any maintenance.
High-pressure fluid from gun, hose leaks, or ruptured components can pierce skin and can cause a serious injury
that may result in amputation. Do not point gun or spray tip at anyone or at any part of the body. Keep clear
of any leaks or ruptures. Depressurize the entire system before attempting cleaning, inspecting, or servicing
equipment.
Exposure to toxic fluids or fumes may occur during the normal operation of this system. Before attempting to fill,
use, or service this system, read MSDS’s to know the specific hazards of the fluids you are using. Always use
proper Personal Protective Equipment when attempting to fill, use, or service this system.

Blastmaster®123P Remote Control System
5
HAZARD IDENTIFICATIONS
Failure to comply with ANY CAUTION listed below may result in minor or moderate injury.
Static electricity can be generated by abrasive moving through the abrasive blasting hose causing a shock
hazard. Prior to use, ground the abrasive blasting pot and abrasive blasting nozzle to dissipate static electricity.
High decibel noise levels are generated during the abrasive blasting process which may cause loss of hearing.
Ensure appropriate Personal Protective Equipment and hearing protection is in use.
Failure to comply with ANY NOTICE listed below could pose a hazard to personnel or property.
See Air & Abrasive Chart for estimated abrasive consumption rates and required air flow (cubic feet per minute).
Your system must meet these minimum requirements to ensure proper function and performance.
Always use abrasive that is dry and properly screened. This will reduce the potential for obstructions to enter the
remote control system, abrasive metering valve and abrasive blasting nozzle.
Moisture build-up occurs when air is compressed. Any moisture within the abrasive blasting system will cause
abrasive to clump, clogging metering valves, hoses and nozzles. Install an appropriately sized moisture separator
at the inlet of the abrasive blasting system. Leave the moisture separator petcock slightly open to allow for
constant release of water. If insufficient volume of air exists and petcock is unable to be left open (at all times)
petcock should be opened frequently to release water.
To reduce abrasive intrusion in the air supply hose, depressurize the abrasive blasting pot before shutting off air
supply from compressor.
Inspect abrasive blasting nozzle before placing into service. Damage to abrasive blasting nozzle liner or
jacket may occur during shipping. If you receive a damaged abrasive blasting nozzle, contact your distributor
immediately for replacement. Abrasive blasting nozzles placed into service may not be returned. Abrasive blasting
nozzle liners are made of fragile materials and can be damaged by rough handling and striking against hard
surfaces. Never use a abrasive blasting nozzle.
Abrasive blasting at optimal pressure for the abrasive used is critical to productivity. Example: For an abrasive
with an optimal abrasive blasting pressure of 100 psi at the abrasive blasting nozzle, one pound per square inch
of pressure loss will reduce abrasive blasting efficiency by 1.5%. A 10 psi reduction in air pressure will cause a
15% loss of efficiency. Use a Needle Pressure Gauge to identify pressure drops in your system. Consult with your
abrasive supplier for the requirements of your abrasive.
Replace abrasive blasting nozzle if liner or jacket is cracked or damaged. Replace abrasive blasting nozzle if
original orifice size has worn 1/16” or more. Determine abrasive blasting nozzle wear by inserting a drill bit 1/16”
larger than original size of abrasive blasting nozzle orifice. If the drill bit passes through abrasive blasting nozzle,
replacement is needed.

Blastmaster®123P Remote Control System 6
AIR & ABRASIVE CONSUMPTION CHART
Failure to comply with ANY NOTICE listed below could pose a hazard to personnel or property.
See Air & Abrasive Chart for estimated abrasive consumption rates and required air flow (cubic feet per minute).
Your system must meet these minimum requirements to ensure proper function and performance.
When it comes to air & abrasive mixtures, more is not necessarily better. Optimum abrasive blasting efficiency
takes place when a lean air & abrasive mixture is used. To correctly set the abrasive metering valve, begin
with the valve fully closed and slowly increase the amount of abrasive entering the airstream. As you increase
the abrasive flow, watch for a “blue flame” at the exit of the abrasive blasting nozzle. Faster cutting, reduced
abrasive consumption and lower clean up costs, are benefits of the “blue flame”.
Abrasive blasting at optimal pressure for the abrasive used is critical to productivity. Example: For an abrasive
with an optimal abrasive blasting pressure of 100 psi at the abrasive blasting nozzle, one pound per square inch
of pressure loss will reduce abrasive blasting efficiency by 1.5%. A 10 psi reduction in air pressure will cause a
15% loss of efficiency. Use a Needle Pressure Gauge to identify pressure drops in your system. Consult with
your abrasive supplier for the requirements of your abrasive.
Figure 1
*Abrasive consumption is based on abrasive with a bulk density of 100 lbs per Cubic Foot
Air & Abrasive Consumption Chart*
Nozzle
Orifice
Pressure at the Nozzle (PSI) Air (in cfm), Abrasive &
Compressor
Requirements
50 60 70 80 90 100 125 140
No. 2
(1/8ˮ)
11
67
2.5
13
77
3
15
88
3.5
17
101
4
18
112
4.5
20
123
5
25
152
5.5
28
170
6.2
No. 3
(3/16ˮ)
26
150
6
30
171
7
33
196
8
38
216
9
41
238
10
45
264
10
55
319
12
62
357
13
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 4
(1/4ˮ)
47
268
11
54
312
12
61
354
14
68
408
16
74
448
17
81
494
18
98
608
22
110
681
25
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 5
(5/16ˮ)
77
468
18
89
534
20
101
604
23
113
672
26
126
740
28
137
812
31
168
982
37
188
1100
41
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 6
(3/8ˮ)
108
668
24
126
764
28
143
864
32
161
960
36
173
1052
39
196
1152
44
237
1393
52
265
1560
58
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 7
(7/16ˮ)
147
896
33
170
1032
38
194
1176
44
217
1312
49
240
1448
54
254
1584
57
314
1931
69
352
2163
77
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 8
(1/2ˮ)
195
1160
44
224
1336
50
252
1512
56
280
1680
63
309
1856
69
338
2024
75
409
2459
90
458
2754
101
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 10
(5/8ˮ)
308
1875
68.5
356
2140
79.5
404
2422
90
452
2690
100.5
504
2973
112
548
3250
122
663
3932
146
742
4405
165
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
No. 12
(3/4ˮ)
432
2672
96
504
3056
112
572
3456
127
644
3840
143
692
4208
154
784
4608
174.5
948
5570
209
1062
6238
236
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
Air (cfm)
Abrasive (lbs/hr)
Compressor Horsepower
Replace abrasive blasting
nozzle if liner or jacket
is cracked or damaged.
Replace abrasive blasting
nozzle if original orifice
size has worn 1/16” or
more. Determine abrasive
blasting nozzle wear by
inserting a drill bit 1/16”
larger than original size
of abrasive blasting
nozzle orifice. If the
drill bit passes through
abrasive blasting nozzle,
replacement is needed.
Inspect abrasive blasting
nozzle before placing
into service. Damage to
abrasive blasting nozzle
liner or jacket may occur
during shipping. If you
receive a damaged
abrasive blasting
nozzle, contact your
distributor immediately
for replacement. Abrasive
blasting nozzles placed
into service may not
be returned. Abrasive
blasting nozzle liners are
made of fragile materials
and can be damaged
by rough handling and
striking against hard
surfaces. Never use a
abrasive blasting nozzle.

Blastmaster®123P Remote Control System
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“THE BIG PICTURE”
3
5
7
4
4
3
21
8
9
17
14
1615
13
19
18
10
20
23
21
424
27
26
25
22
28
5
3
6
11
12

Blastmaster®123P Remote Control System 8
DAILY PRE-OPERATION CHECKLIST
Daily Pre-operation Checklist
1. Abrasive
2. Air Compressor
3. Air Hose Couplings & Gaskets
4. Air Hose
5. Safety Cable
6. Ambient Air Pump*
7. Breathing Air Filter
8. CO Monitor
9. Breathing Line
10. Climate Control Device
11. Abrasive Blasting Suit
12. Gloves
13. Abrasive Blasting Nozzle
14. Lighting System*
15. Abrasive Blasting Nozzle Holder
16. Remote Control Switch
17. Supplied-Air Respirator
18. Control Line
19. Abrasive Blasting Hose
20. Abrasive Blasting Hose
Couplings & Gaskets
21. Abrasive Metering Valve
22. Remote Control System
23. Moisture Separator
24. Abrasive Blasting Pot Exhaust
Muffler
25. Abrasive Blasting Pot
26. Abrasive Blasting Pot Screen
27. Abrasive Blasting Pot Lid
28. Aftercooler*
* Optional or alternative device.
Ask your Marco Representative
for more details.
Abrasive – Select the correct Abrasive (1) for the application. Review the MSDS
(Material Safety Data Sheet) to ensure the correct PPE (Personal Protective
Equipment) and Environmental Controls have been selected and are in place.
Air Compressor – Select an Air Compressor (2) of adequate size to support all
equipment requirements. Refer to “Air & Abrasive Consumption Chart” for
Abrasive Blasting Nozzle (13) air consumption requirements. Before connecting
Air Hose (4), sample the air being produced by the air compressor (2) to ensure
it is free of petroleum contaminants.
Air Hose, and Air Hose Couplings & Gaskets – Select Air Hoses (4) of
sufficient size to support all subsequent volumetric requirements and with a
sufficient PSI (pound per square inch) rating. Inspect all Air Hose (4), and Air
Hose Couplings & Gaskets (3) for damage or wear. Repair or replace damaged
or worn components.
Abrasive Blasting Hose, Abrasive Blasting Hose Couplings & Gaskets, and
Abrasive Blasting Nozzle Holder – Select an Abrasive Blasting Hose (19) that
has an inner diameter 3 to 4 times larger than your Abrasive Blasting Nozzle
(13). Inspect Abrasive Blasting Hose (19), Abrasive Blasting Hose Couplings
& Gaskets (20), and Abrasive Blasting Nozzle Holder (15) for damage or wear.
Repair or replace damaged or worn components.
Safety Cables – Install a Safety Cable (5) at each Abrasive Blasting Hose (19),
and Air Hose (4) connection points.
Aftercooler and Moisture Separator – Ensure Aftercooler (28) is positioned
on stable ground. Keep petcock drain of Moisture Separator (23) slightly open
during use. Drain both devices after each use.
Supplied-Air Respirator, Breathing Line, Breathing Air Filter, Climate
Control Device, CO Monitor, Ambient Air Pump – You MUST consult
the Operator’s Manual supplied with your Respiratory Equipment (6, 7, 8, 9,
10, 17) for ALL applicable instructions and warnings. Inspect all Respiratory
Equipment components for damage or wear. Repair or replace damaged or worn
components.
Abrasive Blasting Suit and Gloves – Select an abrasive-resistant Abrasive
Blasting Suit (11) that is slightly oversized to allow ease of movement and allows
air to flow around your body. Select abrasive-resistant Gloves (12) with a tight fit
and a long cuff that overlaps the sleeve of the Abrasive Blasting Suit (11).
Abrasive Metering Valve and Abrasive Blasting Pot – Confirm Abrasive
Blasting Pot (25) is positioned on stable ground. Inspect Abrasive Blasting Pot
(25) and Abrasive Metering Valve (21) for damage or wear. Repair or replace
damaged or worn components.
Abrasive Blasting Pot Screen and Abrasive Blasting Pot Lid – Always use
an Abrasive Blasting Pot Screen (26) when filling Abrasive Blasting Pot (25)
with Abrasive (1) to prevent debris from entering the Abrasive Blasting Pot (25).
Remove Abrasive Blasting Pot Lid (27) before operating the Abrasive Blasting
Pot (25). Install Abrasive Blasting Pot Lid (27) after use to protect the Abrasive
Blasting Pot’s (25) interior.
Remote Control System, Remote Control Switch, Control Line, – Inspect
Remote Control System (22) and Control Line (18) for damage or wear. Repair
or replace damaged or worn components. Ensure Control Line (18) fittings
connected to the Remote Control System (22) are tight and free of leaks. Ensure
Remote Control Switch (16) is functioning properly. Consult Remote Control
Switch Operator's Manual for applicable instructions.
Abrasive Blasting Pot Exhaust Muffler – Inspect Abrasive Blasting Pot
Exhaust Muffler (24) at start and end of daily use. Replace element of Abrasive
Blasting Pot Exhaust Muffler (24) per Operator's Manual instructions.
Lighting System – Ensure the Lighting System (14) is connected to a proper
power supply before use.

Blastmaster®123P Remote Control System
9
Description
Remote control systems give an operator the ability to remotely activate and deactivate
the flow of air and abrasive at the nozzle. Pressure-release remote control systems
pressurize and depressurize the abrasive blasting pot each time the operator activates
and deactivates the remote control switch, allowing for the abrasive blasting pot to be
filled between activation cycles. This increases productivity and eliminates the need for a
pot tender. The Blastmaster®123P Remote Control System is a pressure-release remote
control system that uses a pneumatic signal from the remote control switch to remotely
activate and deactivate an abrasive blasting pot. Typical applications include blast rooms,
blast yards, bridges, oil refineries, pipelines, railcar shops, shipyards, and storage tanks.
Operational Requirements
The following is required for proper installation of a Blastmaster®123P Remote
Control System:
• An abrasive blasting pot with an air inlet and air exhaust outlet of 1" I.D. or greater.
The following may cause safety hazards or reduced performance:
• Improper installation and/or maintenance of components
• Improper air supply pressure (operating pressure: 50–150 PSI)
• Use of pneumatic twinline hose greater than 100 feet in length
Operating Instructions
Fig. 2
Before using:
• Inspect Blastmaster®123P Remote Control System components for damage and air
leaks. Repair or replace damaged components before use.
• Test Pneumatic Remote Control Switch (5) for proper functioning. (See pneumatic
remote control switch Operator's Manual.)
• Ensure abrasive blasting pot is depressurized. (See abrasive blasting pot Operator's
Manual.)
• Connect air supply from compressor to Inlet Port (3).
• Connect Pneumatic Control Line (4) to Tandem Remote Control Valve (2).
• Connect Pneumatic Remote Control Switch (5) to Pneumatic Control Line (4).
During use:
• To begin abrasive blasting, activate the Pneumatic Remote Control Switch (5), this will
complete an air circuit to the Tandem Remote Control Valve (2), to begin pressurizing the
abrasive blasting pot.
• Monitor all components of the Blastmaster®123P Remote Control System for proper
functioning.
• To cease abrasive blasting, deactivate the Pneumatic Remote Control Switch (5), this will
interrupt the air circuit, allowing the abrasive blasting pot to depressurize.
• Inspect Blowdown Hose Assembly (1) at least twice daily for damage. Repair or replace
damaged components.
After use:
• Inspect components of the Blastmaster®123P Remote Control System for damage.
Repair or replace damaged components.
OSHA requires blast-
cleaning nozzles be
equipped with an
operating valve, which
shall be designed to
be held open only
by continuous hand
pressure and shall
close immediately upon
release of hand pressure
(i.e., a "deadman"
control). The valve
shall not be modified in
any manner that would
allow it to remain open
without the application
of continuous hand
pressure by the operator.
Failure to comply with
the above warning could
result in release of high
speed abrasive and
compressed air resulting
in death or serious injury.
OSHA 29CFR 1910.244(b)
For equipment
manufactured by entities
other than Marco,
you must consult the
Original Equipment
Manufacturer operator's
manuals, information,
training, instructions and
warnings, for the proper
and intended use of all
equipment. Failure to
comply with the above
warning could result in
death or serious injury.
Always depressurize
the entire system,
disconnect all power
sources and lockout/
tagout all components
before any maintenance
or troubleshooting is
attempted. Failure to
comply with the above
warning could cause
electrical shock and
inadvertent activation of
equipment resulting in
death or serious injury.

Blastmaster®123P Remote Control System 10
Figure 2
OPERATING INSTRUCTIONS
2
1
5
4
3
High decibel noise levels
are generated during the
abrasive blasting process
which may cause loss
of hearing. Ensure
appropriate Personal
Protective Equipment
and hearing protection is
in use. Failure to comply
with the above caution
may result in minor or
moderate injury.
Release of high speed
abrasive and compressed
air occurs during
depressurization of the
abrasive blasting pot.
Ensure appropriate
Personal Protective
Equipment is in use.
Failure to comply with
the above caution
may result in minor or
moderate injury.

Blastmaster®123P Remote Control System
11
INSTALLATION
Installation
Fig. 3
NOTE: Additional piping may be required to install the Blastmaster®123P Remote
Control System.
1) Install Air Outlet Port (7) of Tandem Remote Control Valve (5) on inlet piping of
abrasive blasting pot.
2) Insert Blowdown Hose Assembly (4) in Tandem Remote Control Valve (5).
3) Install Blowdown Hose Assembly (4) on outlet piping of abrasive blasting pot.
4) Connect Leg A (1) of Pneumatic Control Line (9) to Fitting (2).
5) Connect Leg B (8) of Pneumatic Control Line (9) to Fitting (3).
6) Connect Pneumatic Remote Control Switch (10) to Pneumatic Control Line (9).
(See pneumatic remote control switch Operator's Manual.)
8) Connect air inlet piping in Air Inlet Port (6) of Tandem Remote Control Valve (5).
Moving parts can present
an area where crushing,
pinching, entanglement
or amputation may occur.
Do not place body parts
or foreign objects in any
area where there are
moving parts. Failure to
comply with the above
warning could result in
death or serious injury.
Inspect all equipment
for wear or damage
before and after each
use. Failure to use
Original Equipment
Manufacturer repair
parts and failure to
immediately replace
worn or damaged
components could void
warranties and cause
malfunctions. Failure to
comply with the above
warning could result in
death or serious injury.

Blastmaster®123P Remote Control System 12
Figure 3
INSTALLATION
5
4
1
9
6
7
8
10
2 3
For equipment
manufactured by entities
other than Marco, you
must consult the
Original Equipment
Manufacturer operator's
manuals, information,
training, instructions and
warnings, for the proper
and intended use of all
equipment. Failure to
comply with the above
warning could result in
death or serious injury.
Apply pipe thread sealant
to all pipe threads to
ensure an airtight seal.
Pulling and dragging
abrasive blasting hose
may cause pneumatic
control line connections
to separate. Connect the
pneumatic control line
to the abrasive blasting
hose every 4 to 6 feet
and on each side of the
pneumatic control line
connections. Provide
adequate slack at each
connection.
Always depressurize
the entire system,
disconnect all power
sources and lockout/
tagout all components
before any maintenance
or troubleshooting is
attempted. Failure to
comply with the above
warning could cause
electrical shock and
inadvertent activation of
equipment resulting in
death or serious injury.

Blastmaster®123P Remote Control System
13
MAINTENANCE
Disassemble and Assemble Tandem Remote Control Valve
Maintenance of the Tandem Remote Control Valve is limited to the daily cleaning and the
immediate replacement of damaged or worn parts.
Disassemble:
Fig. 4
1) Remove Swivel Fittings (3 and 11).
2) Remove Breather Muffler (22).
3) Remove four Bolts (26), Washers (25), Nuts (12), and Washers (13) in a cross pattern.
4) Remove Base (14) and Cap (24). Note orientation of Cap when removing.
5) Remove Lower Rod O-ring (17).
6) Remove Nut (10), Washer (15), two O-rings (9), and Valve Plug (16) from Shaft (19).
7) Remove Lower Rod Guide (8) from Shaft (19).
8) Gently remove Pinch Ram (23) from Cylinder (21).
9) Insert a tool in Hole (D), and remove Spring (20) from Shaft (19) by grasping Pinch
Ram (23) and turning it counter-clockwise. Remove Pinch Ram (23) from Shaft. NOTE:
Spring is under tension. Do not remove Snap Ring (6) before Spring is removed.
10)Remove Upper Rod Guide (2) and Spring (20) from Shaft (19).
11)Remove Snap Ring (6), Piston (18) and O-ring (4) from Shaft (19).
12)Remove U-cup (5) from Piston (18).
13)Remove Seal (1) from Upper Rod Guide (2).
14)Remove U-cup (7) from Lower Rod Guide (8).
15)Clean and inspect all parts for damage. Replace damaged parts as necessary.
Assemble:
1) Install O-ring (4) in wide groove of Shaft (19).
2) Place Piston Seal (5) on Piston (18).
3) Apply white lithium grease to O-ring (4), and install Piston (18) onto Shaft (19). Install
Snap Ring (6). Ensure "flat" side of the Piston is facing the male threads on Shaft.
4) Install Upper Rod Guide Seal (1) into Upper Rod Guide (2) as shown. Apply white
lithium grease to inner diameter of Upper Rod Guide Seal.
5) Install Spring (20), and Upper Rod Guide (2) on Shaft (19).
6) Compress Spring (20) until Shaft (19) protrudes through Upper Rod Guide (2) and
install Pinch Ram (23) in Shaft.
7) Place Cylinder (21) on flat surface with tapered inner diameter facing up.
8) Lubricate outer surface of Piston Seal (5) using white lithium grease. Insert Shaft
Assembly into Cylinder (21) until Upper Rod Guide (2) fully seats in Cylinder.
9) Install Seal (7), as shown, in Lower Rod Guide (8). Place Lower Rod Guide on
Shaft (19) with flat side toward Piston (18).
10)Install Valve Plug (16) on Shaft (19). Install two O-rings (9) on Shaft and seat in recess
of Valve Plug. Install Washer (15) and Nut (10) on Shaft.
11)Place Cap (24) over Pinch Ram (23) and seat Cap against Cylinder (21). Ensure
Blow Down Assembly Port (A) is aligned with Control Line Port (B) on top of Cylinder.
and Pinch Ram (23) seats in internal grooves in Cap. Place Washer (25) on Bolt (26)
and install in Cap. Repeat for remaining three washers and bolts.
12)Place O-Ring (17) on Lower Rod Guide (8), and install Base (14) over Valve Plug (16).
Ensure Control Line Port (C) is aligned with Control Line Port (B).
13)Insert Bolt (26) through Base (14), and install Washer (13) and Nut (12) on Bolt. Repeat
for remaining three washers and nuts. Tighten Nuts in a cross pattern.
14)Install 1/8" Breather Vent (22), in port closest to Pinch Ram (23).
15)Install 1/4" Swivel Fitting (11) in Control Line Port (C) and 1/8" Swivel Fitting (3) in
Control Line Port (A).
Never use compressed
air to separate or remove
internal components
during maintenance.
Components could be
ejected at high speeds.
Failure to comply with
the above warning could
result in death or serious
injury.
Moving parts can present
an area where crushing,
pinching, entanglement
or amputation may occur.
Do not place body parts
or foreign objects in any
area where there are
moving parts. Failure to
comply with the above
warning could result in
death or serious injury.
The Tandem Remote
Control Valve base
(p/n) 1012321) has an
integrated restrictor
port to limit the volume
of supplied air to the
remote control switch.
Failure to use original
manufacturer repair parts
will void warranties,
cause malfunctions
and could result in
uncontrolled release of
high speed abrasive and
compressed air. Failure
to comply with the above
warning could result in
death or serious injury.
Always depressurize
the entire system,
disconnect all power
sources and lockout/
tagout all components
before any maintenance
or troubleshooting is
attempted. Failure to
comply with the above
warning could cause
electrical shock and
inadvertent activation of
equipment resulting in
death or serious injury.

Blastmaster®123P Remote Control System 14
MAINTENANCE
Figure 4
D
ABC
1
10 11
12
1314
15
1617
1819
2
20
21
22
23
2425
26
3456
7
8
9
23
6

Blastmaster®123P Remote Control System
15
TROUBLESHOOTING
If the Blastmaster®123P Remote Control System does not function properly, check the
following:
SYMPTOM (Cause) ACTION
Abrasive blasting pot will not
pressurize
(Damaged components, Pneumatic
control line, Improper air supply)
Inspect pneumatic control lines for correct
routing, air leaks, blockage or pinch points.
Tighten control line fittings if leaks are
present. Replace damaged pneumatic
control lines.
1/8" Breather Muffler. Remove 1/8" Breather
Muffler, and attempt to pressurize brasive
blasting pot. If abrasive blasting pot
pressurizes, replace 1/8" Breather Muffler.
Observe Pinch Ram clamping on Blowdown
Hose. If Pinch Ram does not fully clamp on
Blowdown Hose, inspect Tandem Remote
Control Valve for damage. Repair or replace
damaged components.
Inspect Blowdown Hose Assembly for leaks.
Replace Blow Down Assembly.
Insufficient air supply. Ensure minimum of
50 PSI is supplied to the Tandem Remote
Control Valve.
See Operator’s Manual for the remote
control switch, and abrasive blasting pot.
Inconsistent activation/
deactivation
(Improper air supply, Damaged
components, Pneumatic control lines)
Inspect pneumatic control lines for correct
routing, air leaks, blockage or pinch points.
Tighten control line fittings if leaks are
present. Replace damaged pneumatic
control lines.
Insufficient air supply. Ensure minimum of
50 PSI is supplied to the Tandem Remote
Control Valve.
Inspect Tandem Remote Control Valve for
damage. Repair or replace as necessary.
See Operator’s Manual for the remote
control switch, and abrasive blasting pot.
Frozen moisture could
cause restrictions
and obstructions in
pneumatic twinline or
single line hoses. Any
restriction or obstruction
in the pneumatic
twinline or sinlge line
hoses could prevent
the proper activation
and deactivation of the
remote control system,
resulting in the release
of high speed abrasive
and compressed air.
In conditions where
moisture may freeze in
the pneumatic twinline
or single line hoses
an antifreeze injection
system approved for
this application can be
installed. Failure to
comply with the above
warning could result in
death or serious injury.
Do not cut, obstruct,
restrict or pinch
pneumatic twinline
or single line hoses.
Doing so could prevent
the proper activation
and deactivation of the
remote control system,
resulting in the release of
high speed abrasive and
compressed air. Failure
to comply with the above
warning could result in
death or serious injury.
Always depressurize
the entire system,
disconnect all power
sources and lockout/
tagout all components
before any maintenance
or troubleshooting is
attempted. Failure to
comply with the above
warning could cause
electrical shock and
inadvertent activation of
equipment resulting in
death or serious injury.

Blastmaster®123P Remote Control System 16
TROUBLESHOOTING
If the Blastmaster®123P Remote Control System does not function properly, check the
following:
SYMPTOM (Cause) ACTION
Abrasive blasting pot will not
depressurize or
depressurizes slowly
(Damaged components, Pneumatic
control line, obstruction in system
exhaust)
Inspect pneumatic control lines for correct
routing, air leaks, blockage or pinch points.
Tighten control line fittings if leaks are
present. Replace damaged pneumatic
control lines.
1/8" Breather Muffler. Remove 1/8" Breather
Muffler, and attempt to depressurize
abrasive blasting pot. If abrasive blasting pot
depressurizes, replace 1/8" Breather Muffler.
Inspect Tandem Remote Control Valve for
damage. Repair or replace as necessary.
Inspect Blowdown Hose Assembly for
obstructions and damage. Replace
Blowdown Assembly.
See Operator’s Manual for the remote
control switch, and abrasive blasting pot.
Do not cut, obstruct,
restrict or pinch
pneumatic twinline
or single line hoses.
Doing so could prevent
the proper activation
and deactivation of the
remote control system,
resulting in the release of
high speed abrasive and
compressed air. Failure
to comply with the above
warning could result in
death or serious injury.
Always depressurize
the entire system,
disconnect all power
sources and lockout/
tagout all components
before any maintenance
or troubleshooting is
attempted. Failure to
comply with the above
warning could cause
electrical shock and
inadvertent activation of
equipment resulting in
death or serious injury.

Blastmaster®123P Remote Control System
17
ASSEMBLY PART NUMBERS AND SCHEMATIC
Figure 6: Blastmaster®123P Remote Control System
Item # Part # Description
Fig. 6
— 1012351 Blastmaster®123P Remote Control System – Complete
1 1012350 Blowdown Hose Assembly
(Includes Item #'s: 5 (Quantity of two feet) and 6)
2 1012300 Tandem Remote Control Valve – Complete (see Figure 7)
3 1015200 Blastmaster®152P Remote Control Switch
4 1016000 55 Feet of Coupled Control Line with 1/4" and 1/8" Fittings
5 10BH0342BR 3/4" I.D. Abrasive Blasting Hose (sold per foot)
6 10NHA1 1-1/4" Aluminum Nozzle Holder
— 106M007 Part Numbers & Schematics Guide – Blastmaster®123P Remote Control System
— 106M068 Part Numbers & Schematics Guide – Blastmaster®152P Remote Control Switch
— 1090007 Operator's Manual – Blastmaster®123P Remote Control System
— 1090068 Operator's Manual – Blastmaster® 152 Remote Control Switch
2
1
4
3
5
6

Blastmaster®123P Remote Control System 18
Figure 7: Tandem Remote Control Valve
ASSEMBLY PART NUMBERS AND SCHEMATIC
Item # Part # Description
Fig. 7
— 1012300 Tandem Remote Control Valve – Complete
1 1012308 Seal – Upper Rod Guide
2 1014239 1/8" 90oSwivel Fitting
3 1012312 O-ring – Shaft
4 1012317 Seal – Piston
5 1012313 13/16" External Snap Ring
6 1012314 Seal – Lower Rod Guide
7 1012322 Valve Plug Assembly (Includes Item #12)
8 1012326 1/4" 90oSwivel Fitting
9 1014241 3/8" Washer (Eight Required)
10 1012318 3/8-16 Nut (Four Required)
11 1012321 Base
12 1012320 O-ring – Lower Rod Guide
13 1012319 Lower Rod Guide
14 1012315 Piston
15 1012316 Shaft
16 1012309 Spring
17 1012311 Cylinder
18 1012905 1/8" Breather Muffler
19 1012307 Upper Rod Guide
20 1012306 Pinch Ram
21 1012305 Cap
22 1012310 3/8-16 x 6" Bolt (Four Required)
— 1012301 Tandem Remote Control Valve Repair Kit
(Includes Item #'s: 1,3–7, and 12)
— 106M007 Part Numbers and Schematics Guide – Blastmaster®123P Remote Control System
— 1090007 Operator's Manual – Blastmaster®123P Remote Control System
— 1091045 Hazard Identification Tag
654321 87
11
9 10
1213141516171819202122 9

Blastmaster®123P Remote Control System
19
MAINTENANCE NOTES
DATE TYPE OF SERVICE PART NUMBER