Grizzly G0943, G0942 User guide

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MODEL G0942/G0943

EXTREME-SERIES AIR

COMPRESSORS

OWNER'S MANUAL

(For models manufactured since 03/21)

WARNING : NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE

OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.

#CS22467 PRINTED IN USA

***Keep for Future Reference***

V1.12 . 2 2

This manual provides critical safety instructions on the proper setup, operation, maintenance, and service of this machine/tool. Save this document, refer to it often, and use it to instruct other operators.

Failure to read, understand and follow the instructions in this manual may result in fire or serious personal injury—including amputation, electrocution, or death.

The owner of this machine/tool is solely responsible for its safe use. This responsibility includes but is not limited to proper installation in a safe environment, personnel training and usage authorization, proper inspection and maintenance, manual availability and comprehension, application of safety devices, cutting/sanding/grinding tool integrity, and the usage of personal protective equipment.

The manufacturer will not be held liable for injury or property damage from negligence, improper training, machine modifications or misuse.

Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

• Lead from lead-based paints.

• Crystalline silica from bricks, cement and other masonry products.

• Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: Work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

Table of Contents

INTRODUCTION ............................................... 2

Contact Info.................................................... 2

Manual Accuracy Identification Controls & Components Model G0942 Machine Data Sheet Model G0943 Machine Data Sheet

SECTION 1: SAFETY

Safety Instructions for Machinery Additional Safety for Air Compressors

SECTION 2: POWER SUPPLY

SECTION 3: SETUP

Unpacking Needed for Setup Inventory Site Considerations Lifting & Placing Anchoring to Floor

Power Connection........................................ 19

Test Run

SECTION 4: OPERATIONS

Operation Overview Distribution System Design Distribution System Components Choosing Air Hoses Connecting Air Tools

.................................................... 16

...................................................... 16

...................................................... 21

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................................................... 3

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................ 10

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SECTION 5: ACCESSORIES

SECTION 6: MAINTENANCE

Schedule

Draining Tank............................................... 33

Lubrication Checking Air Filters Adjusting Belt Tension/Pulley Alignment Checking for Leaks Machine Storage

SECTION 7: SERVICE

Troubleshooting Adjusting Cut-In/Cut-Out Settings

SECTION 8: WIRING

Wiring Safety Instructions G0942 Wiring Diagram

G0942 Electrical Component Photos........... 48

G0943 230V Wiring Diagram G0943 460V Wiring Diagram

G0943 Electrical Component Photos........... 51

SECTION 9: PARTS

G0942 Pump G0943 Pump G0942 Tank & Motor G0943 Tank & Motor G0942 Labels & Cosmetics G0943 Labels & Cosmetics

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We are proud to provide a high-quality owner’s manual with your new machine!

instructions, specifications, drawings, and photographs in this manual. Sometimes we make mistakes, but our policy of continuous improvement also means that

you receive is

slightly different than shown in the manual

If you find this to be the case, and the difference between the manual and machine leaves you confused or unsure about something

check our

website for an updated version. W

current

manuals and

on our web-

site at

Alternatively, you can call our Technical Support for help. Before calling, make sure you write down the

serial number from the machine ID label (see below). This information is required for us to provide proper tech support, and it helps us determine if updated documentation is available for your machine.

INTRODUCTION

Contact Info

If you have questions, need help, need warranty information, or need to order parts, contact MEGA with the information below. Before contacting, make sure you get the serial number and manu- facture date from the machine ID label.

MEGA Compressor Technical Support

Phone: (832) 415-6995

Email: cs@megacompressor.com

We want your feedback on this manual. What did you like about it? Where could it be improved? Please take a few minutes to give us feedback.

Like all machinery there is potential danger when operating this machine. Accidents are frequently caused by lack of familiarity or failure to pay attention. Use this machine with respect and caution to decrease the risk of operator injury. If normal safety precautions are overlooked or ignored, serious personal injury may occur.

Grizzly Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Email: manuals@grizzly.com

Manual Accuracy

made every effort to be exact with the

sometimes the machine

e post

manual updates for free

www.grizzly.com.

manufacture date and

No list of safety guidelines can be complete. Every shop environment is different. Always consider safety first, as it applies to your individual working conditions. Use this and other machinery with caution and respect. Failure to do so could result in serious personal injury, damage to equipment, or poor work results.

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Manufacture Date

Serial Number

Model G0942/G0943 (Mfd. Since 03/21)

Identification

To reduce your risk of serious injury, read this entire manual BEFORE

Become familiar with the names and locations of the controls and features shown below to better understand the instructions in this manual.

Tank

Motor

Safety

Relief Valve

Oil Sight

Glass

Exhaust

Tube

Magnetic

Switch Box

Output

Port

Compressor

Pump

Pressure

Switch

Air Filter

Tank Pressure

Gauge

Belt Guard

G0942 Shown

Discharge

Line

Model G0942/G0943 (Mfd. Since 03/21)

G0942 Shown

Drain Valve

using machine.

G0943 Shown

Drain Valve

-3-

Controls &

To reduce your risk of serious injury, read this entire manual BEFORE

Components

using machine.

Refer to the following figures and descriptions to become familiar with the basic controls and components of this machine. Understanding these items and how they work will help you understand the rest of the manual and minimize your risk of injury when operating this machine.

Air Input

G0942 G0943

Figure 2. Location of drain valve handle.

F. Drain Valve: Drains built-up moisture from

tank when ball valve is opened.

Automatic Pressurization

Figure 1. Front air input components (Model

G0943 shown).

A. Air Filters: Clean air entering compressor

pump.

B. Tank: Holds pressurized air.

C. Tank Pressure Gauge: Indicates pressure

of air in tank.

D. Exhaust Tube: Transfers compressed air

from pump to tank.

E. Compressor Pump: Uses pistons to draw in

and compress air before transferring air into tank.

-4-

Figure 3. Pressurization components (Model

G0942 shown).

G. Pressure Switch Lever: Toggles pressure

switch between OFF and AUTO/ON modes. Machine is OFF in OFF mode, and will continue to pressurize when in AUTO/ON mode.

H. Discharge Line: Releases air from compres-

sor pump and outlet line when tank pressure exceeds 175 PSI (cut-out pressure).

I. Pressure Switch: Turns motor ON when

tank pressure drops below 145 PSI (cut-in pressure) and switch is in AUTO/ON position. Switch contains pressure relief valve that will activate discharge line when tank pressure exceeds 175 PSI (cut-out pressure) or pressure switch is turned OFF.

Model G0942/G0943 (Mfd. Since 03/21)

L. Crankcase Breather (G0943 Only):

Releases air from crankcase in the event that piston gaskets wear and air passes into oil compartment.

Figure 4. Location of tank safety relief valve

(Model G0942 shown).

J. Tank Safety Relief Valve: Pops open to

release tank pressure in the event that pressure switch fails to stop motor at cut-out pressure.

Air Output/Delivery

Figure 7. Location of outlet port.

M. Outlet Port: Delivers air from tank to air

delivery system. Shut-off valve stops air from entering system.

Magnetic Switch Box

Figure 5. Location of pump safety relief valve.

K. Pump Safety Relief Valve (G0942 Only):

Pops open to release pump pressure in the event of overpressurization during 2nd stage of pressurization.

Figure 6. Location of crankcase breather.

Figure 8. Location of magnetic switch (Model

G0943 shown).

N. Magnetic Switch: Controls motor operation

with thermally protected magnetic switch.

O. Reset Button: Restores power to motor

when pressed after thermal overload relay has been tripped. To reset, place pressure switch lever in OFF position, wait a few minutes for motor to cool, then press reset button. If motor does not reset, allow motor to cool longer, than try again.

Model G0942/G0943 (Mfd. Since 03/21)

-5-

Model G0942 Machine Data Sheet

Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901

MODEL G0942

80-GALLON 7.5 HP EXTREME-SERIES AIR COMPRESSOR

Product Dimensions:

Weight ..............................................................................................................................................................565 lbs.

Width (side-to-side) x Depth (front-to-back) x Height ......................................................................... 40 x 32 x 73 in.

Footprint (Length x Width) .......................................................................................................................... 19 x 19 in.

Shipping Dimensions:

Type ..........................................................................................................................................................Wood Crate

Content ............................................................................................................................................................ Machine

Weight ..............................................................................................................................................................620 lbs.

Length x Width x Height ...................................................................................................................... 44 x 35 x 76 in.

Must Ship Upright .................................................................................................................................................. Yes

Electrical:

Power Requirement ..........................................................................................................230V, Single-Phase, 60 Hz

Full-Load Current Rating ........................................................................................................................................ 31A

Minimum Circuit Size .............................................................................................................................................40A

Connection Type ...........................................................................................Permanent (Hardwire to Shutoff Switch)

Switch Type ....................................................................................................Magnetic Switch w/Overload Protection

Motors:

Main

Horsepower ............................................................................................................................................. 7.5 HP

Phase ............................................................................................................................................ Single-Phase

Amps ............................................................................................................................................................ 31A

Speed ................................................................................................................................................ 1725 RPM

Type .................................................................................................................TEFC Capacitor-Start Induction

Power Transfer ............................................................................................................................................. Belt

Bearings .....................................................................................................Shielded & Permanently Lubricated

Centrifugal Switch/Contacts Type .......................................................................................................... Internal

Main Specifications:

Operation Information

Compressor Style ................................................................................................................................... Vertical

Pump Type ........................................................................................................................................ Two-Stage

Max. Airflow/Delivery (at 40 PSI) ........................................................................................................28 SCFM

Max. Airflow/Delivery (at 90 PSI) ........................................................................................................23 SCFM

Max. Pressure ....................................................................................................................................... 175 PSI

Cut-Out Pressure .................................................................................................................................. 175 PSI

Cut-In Pressure ..................................................................................................................................... 145 PSI

Duty Cycle ................................................................................................................................................. 60/40

Tank Size ..........................................................................................................................................80 Gallons

Number of Cylinders ........................................................................................................................................ 1

Pump Lubrication .............Grizzly Model T28041 or 100% Fully Synthetic Non-Detergent Air Compressor Oil

Drain Valve Type ................................................................................................................................ Ball Valve

Regulator ........................................................................................................................................................No

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Model G0942/G0943 (Mfd. Since 03/21)

Output Port Information

Connection Type ..........................................................................................................Female Threaded Valve

Connection Size ...................................................................................................................................3/4" NPT

Number of Connections ................................................................................................................................... 1

Hose Included ................................................................................................................................................No

Construction Information

Tank ........................................................................................................................................................... Steel

Valves ........................................................................................................................ Brass/Brass-Coated Steel

Paint Type/Finish ................................................................................................................................... Enamel

Other Specifications:

Country of Origin ................................................................................................................................................... USA

Warranty .............................................................................................................................................................1 Year

Approximate Assembly & Setup Time ........................................................................................................30 Minutes

Serial Number Location ...................................................................................................................................ID Label

Sound Rating ......................................................................................................................................................79 dB

Features:

80-Gallon Tank with Maximum Airflow of 23 CFM at 90 PSI Ball-Valve Drain Control Fan Pulley and Cooling Fin Design to Keep Compressor Cool Oil Sight Glass 2-Stage Compressor for Optimum Output W-Cylinder Cast-Iron Air Compressor Pump

Model G0942/G0943 (Mfd. Since 03/21)

-7-

Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901

MODEL G0943

120-GALLON 10 HP EXTREME-SERIES AIR COMPRESSOR

Product Dimensions:

Weight ..............................................................................................................................................................950 lbs.

Width (side-to-side) x Depth (front-to-back) x Height ......................................................................... 42 x 31 x 75 in.

Footprint (Length x Width) .......................................................................................................................... 24 x 24 in.

Shipping Dimensions:

Type ..........................................................................................................................................................Wood Crate

Content ............................................................................................................................................................ Machine

Weight ..............................................................................................................................................................980 lbs.

Length x Width x Height ...................................................................................................................... 39 x 54 x 82 in.

Must Ship Upright .................................................................................................................................................. Yes

Electrical:

Power Requirement .................................................................................................... 230V or 460V, 3-Phase, 60 Hz

Prewired Voltage .................................................................................................................................................. 230V

Full-Load Current Rating .................................................................................................... 24A at 230V, 12A at 460V

Minimum Circuit Size ......................................................................................................... 30A at 230V, 15A at 460V

Connection Type ...........................................................................................Permanent (Hardwire to Shutoff Switch)

Switch Type ....................................................................................................Magnetic Switch w/Overload Protection

Motors:

Main

Horsepower .............................................................................................................................................. 10 HP

Phase .................................................................................................................................................... 3-Phase

Amps ........................................................................................................................ 24A at 230V, 12A at 460V

Speed ................................................................................................................................................ 1760 RPM

Type .......................................................................................................................................... TEFC Induction

Power Transfer ............................................................................................................................................. Belt

Bearings .....................................................................................................Shielded & Permanently Lubricated

Main Specifications:

Operation Information

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Compressor Style ................................................................................................................................... Vertical

Pump Type ........................................................................................................................................ Two-Stage

Max. Airflow/Delivery (at 40 PSI) ........................................................................................................45 SCFM

Max. Airflow/Delivery (at 90 PSI) ........................................................................................................40 SCFM

Max. Pressure ....................................................................................................................................... 175 PSI

Cut-Out Pressure .................................................................................................................................. 175 PSI

Cut-In Pressure ..................................................................................................................................... 145 PSI

Duty Cycle ................................................................................................................................................. 70/30

Tank Size ........................................................................................................................................120 Gallons

Number of Cylinders ........................................................................................................................................ 1

Pump Lubrication .............Grizzly Model T28041 or 100% Fully Synthetic Non-Detergent Air Compressor Oil

Drain Valve Type ................................................................................................................................ Ball Valve

Regulator ........................................................................................................................................................No

Model G0942/G0943 (Mfd. Since 03/21)

Output Port Information

Connection Type ..........................................................................................................Female Threaded Valve

Connection Size ...................................................................................................................................3/4" NPT

Number of Connections ................................................................................................................................... 1

Hose Included ................................................................................................................................................No

Construction Information

Tank ........................................................................................................................................................... Steel

Valves ........................................................................................................................ Brass/Brass-Coated Steel

Paint Type/Finish ................................................................................................................................... Enamel

Other Specifications:

Country of Origin ................................................................................................................................................... USA

Warranty .............................................................................................................................................................1 Year

Approximate Assembly & Setup Time ........................................................................................................30 Minutes

Serial Number Location ...................................................................................................................................ID Label

Sound Rating ......................................................................................................................................................79 dB

Features:

120-Gallon Tank with Maximum Airflow of 40 CFM at 90 PSI Ball-Valve Drain Control Fan Pulley and Cooling Fin Design to Keep Compressor Cool Oil Sight Glass 2-Stage Compressor for Optimum Output W-Cylinder Cast-Iron Air Compressor Pump

Model G0942/G0943 (Mfd. Since 03/21)

-9-

SECTION 1: SAFETY

For Your Own Safety, Read Instruction

Manual Before Operating This Machine

The purpose of safety symbols is to attract your attention to possible hazardous conditions.

This manual uses a series of symbols and signal words intended to convey the level of importance of the safety messages. The progression of symbols is described below. Remember that safety messages by themselves do not eliminate danger and are not a substitute for proper accident prevention measures. Always use common sense and good judgment.

Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, MAY result in minor or moderate injury. It may also be used to alert against unsafe practices.

Alerts the user to useful information about proper operation of the

NOTICE

machine to avoid machine damage.

Safety Instructions for Machinery

OWNER’S MANUAL. Read and understand this

owner’s manual BEFORE using machine.

TRAINED OPERATORS ONLY. Untrained operators have a higher risk of being hurt or killed. Only allow trained/supervised people to use this machine. When machine is not being used, disconnect power, remove switch keys, or lock-out machine to prevent unauthorized use—especially around children. Make your workshop kid proof!

DANGEROUS ENVIRONMENTS. Do not use machinery in areas that are wet, cluttered, or have poor lighting. Operating machinery in these areas greatly increases the risk of accidents and injury.

MENTAL ALERTNESS REQUIRED. Full mental alertness is required for safe operation of machinery. Never operate under the influence of drugs or alcohol, when tired, or when distracted.

ELECTRICAL EQUIPMENT INJURY RISKS. You can be shocked, burned, or killed by touching live electrical components or improperly grounded machinery. To reduce this risk, only allow qualified service personnel to do electrical installation or repair work, and always disconnect power before accessing or exposing electrical equipment.

DISCONNECT POWER FIRST. nect machine from power supply BEFORE making adjustments, changing tooling, or servicing machine. This prevents an injury risk from unintended startup or contact with live electrical components.

EYE PROTECTION. Always wear ANSI-approved safety glasses or a face shield when operating or observing machinery to reduce the risk of eye injury or blindness from flying particles. Everyday eyeglasses are NOT approved safety glasses.

Always discon-

-10 -

Model G0942/G0943 (Mfd. Since 03/21)

WEARING PROPER APPAREL. Do not wear clothing, apparel or jewelry that can become entangled in moving parts. Always tie back or cover long hair. Wear non-slip footwear to reduce risk of slipping and losing control or accidentally contacting cutting tool or moving parts.

HAZARDOUS DUST. Dust created by machinery operations may cause cancer, birth defects, or long-term respiratory damage. Be aware of dust hazards associated with each workpiece material. Always wear a NIOSH-approved respirator to reduce your risk.

HEARING PROTECTION. Always wear hearing protection when operating or observing loud machinery. Extended exposure to this noise without hearing protection can cause permanent hearing loss.

REMOVE ADJUSTING TOOLS. Tools left on machinery can become dangerous projectiles upon startup. Never leave chuck keys, wrenches, or any other tools on machine. Always verify removal before starting!

USE CORRECT TOOL FOR THE JOB. Only use this tool for its intended purpose—do not force it or an attachment to do a job for which it was not designed. Never make unapproved modifications—modifying tool or using it differently than intended may result in malfunction or mechanical failure that can lead to personal injury or death!

AWKWARD POSITIONS. Keep proper footing and balance at all times when operating machine. Do not overreach! Avoid awkward hand positions that make workpiece control difficult or increase the risk of accidental injury.

CHILDREN & BYSTANDERS. Keep children and bystanders at a safe distance from the work area. Stop using machine if they become a distraction.

GUARDS & COVERS. Guards and covers reduce accidental contact with moving parts or flying debris. Make sure they are properly installed, undamaged, and working correctly BEFORE operating machine.

FORCING MACHINERY. Do not force machine. It will do the job safer and better at the rate for which it was designed.

NEVER STAND ON MACHINE. Serious injury may occur if machine is tipped or if the cutting tool is unintentionally contacted.

STABLE MACHINE. Unexpected movement during operation greatly increases risk of injury or loss of control. Before starting, verify machine is stable and mobile base (if used) is locked.

USE RECOMMENDED ACCESSORIES. Consult this owner’s manual or the manufacturer for recommended accessories. Using improper accessories will increase the risk of serious injury.

UNATTENDED OPERATION. To reduce the risk of accidental injury, turn machine OFF and ensure all moving parts completely stop before walking away. Never leave machine running while unattended.

MAINTAIN WITH CARE. Follow all maintenance instructions and lubrication schedules to keep machine in good working condition. A machine that is improperly maintained could malfunction, leading to serious personal injury or death.

DAMAGED PARTS. Regularly inspect machine for damaged, loose, or mis-adjusted parts—or any condition that could affect safe operation. Immediately repair/replace BEFORE operating machine. For your own safety, DO NOT operate machine with damaged parts!

MAINTAIN POWER CORDS. When disconnecting cord-connected machines from power, grab and pull the plug—NOT the cord. Pulling the cord may damage the wires inside. Do not handle cord/plug with wet hands. Avoid cord damage by keeping it away from heated surfaces, high traffic areas, harsh chemicals, and wet/damp locations.

EXPERIENCING DIFFICULTIES. If at any time you experience difficulties performing the intended operation, stop using the machine! Contact our Technical Support at (570) 546-9663.

Model G0942/G0943 (Mfd. Since 03/21)

-11-

Additional Safety for Air Compressors

Serious impact injury or death can occur from bursting tank, attachment tool, distribution line, or hose. Contact with hot compressor parts can result in burns. Operating this tool in an environment without proper ventilation or near combustible materials can lead to explosions or fires. Eyes and other soft tissues can be easily injured by air streams and debris projected by compressed air or attachment tools. To reduce the risk of these hazards, operator and bystanders MUST completely heed hazards and warnings below.

TANK INTEGRITY. Inspect tank, attachment

tools, pump, air lines, and valves for rust, damage, weakness, leaks, looseness, or excessive wear and repair/replace damaged components before operating. Replace a damaged tank immediately. DO NOT attempt to weld on, modify, or repair tank. Modifying tank can affect tank integrity and cause tank to burst.

ATTACHM ENT TOOL S. Always wear ANSIapproved eye protection and any additional personal protective equipment required by attachment tools. Pneumatic tools can propel objects and debris at high speeds or even explode. Never use damaged tools—they are even more likely to rupture. DO NOT exceed pressure ratings of tools or attachments as lines and seals may burst. Use proper air hose for tool and confirm air hose is long enough to reach work area without stretching. Do not carry attachment tool with hand on trigger to reduce risk of accidental firing. Always relieve outlet air line and hose before attaching/removing tools. Disconnect hose or tool from compressor when not in use.

MODIFICATIONS. DO NOT adjust or remove safety relief valve, pressure switch, or otherwise modify machine. Do not install shut-off valve between compressor pump and tank. Check, safety, and pressure valves are adjusted at factory for correct tolerances and abilities of compressor and are designed to keep tank and other components from bursting.

INTENDED USE. DO NOT use compressed air as breathable air supply and DO NOT aim compressed air or air tools at body parts or people. Compressed air can injure or propel debris into eyes or other soft tissues. Do not use compressor to inflate low-pressure objects that are likely to burst (like children’s toys).

DAILY MAINTENANCE. Test safety relief valve daily to dislodge any blockages and confirm it is working correctly. Drain moisture from tank daily to prevent internal corrosion that could weaken tank.

DISTRIBUTION LINES. Use only stainless steel, copper, or aluminum for air delivery/distribution lines. NEVER use PVC because it cannot withstand the pressure, heat, condensation, and oils of compressed air and may shatter, creating dangerous shrapnel.

VENTILATION. Only operate in well-ventilated environment that is less than 100°F and keep compressor at least 18 inches from nearest wall. DO NOT obstruct airflow to air filters and ventilation openings. Regularly check and change air filters to avoid buildup of impurities and reduce risk of fire.

COMBUSTION. Compressor motor, pressure switch, and some pneumatic attachment tools often produce sparks. Only operate compressor in area free of combustible materials to prevent fires and explosions. When spraying, locate air compressor at least 20 feet from spray area, do not smoke, and do not spray flammable material in confined area near flame/compressor. Turn compressor OFF when unattended. Motor could overheat and create fire hazard.

HOT PARTS. Discharge line and other compressor pump parts heat up during operation. Do not touch these parts during or immediately following operation to prevent burns.

MOVING AND SERVICING. Disconnect power, allow compressor to cool, bleed air from system, and disconnect attachment tools and hoses before moving or servicing to prevent impact injuries, soft tissue injuries, and burns.

-12-

Model G0942/G0943 (Mfd. Since 03/21)

SECTION 2: POWER SUPPLY

Before installing the machine, consider the availability and proximity of the required power supply circuit. If an existing circuit does not meet the requirements for this machine, a new circuit must be installed. To minimize the risk of electrocution, fire, or equipment damage, installation work and electrical wiring must be done by an electrician or qualified service personnel in accordance with all applicable codes and standards.

or equipment damage may occur if machine is not properly grounded and connected to power

The full-load current rating is the amperage a machine draws at 100% of the rated output power. On machines with multiple motors, this is the amperage drawn by the largest motor or sum of all motors and electrical devices that might operate at one time during normal operations.

The full-load current is not the maximum amount of amps that the machine will draw. If the machine is overloaded, it will draw additional amps beyond the full-load rating.

If the machine is overloaded for a sufficient length of time, damage, overheating, or fire may result— especially if connected to an undersized circuit. To reduce the risk of these hazards, avoid overloading the machine during operation and make sure it is connected to a power supply circuit that meets the specified circuit requirements.

For your own safety and protection of

Note: Circuit requirements in this manual apply to

a dedicated circuit—where only one machine will be running on the circuit at a time. If machine will be connected to a shared circuit where multiple machines may be running at the same time, consult an electrician or qualified service personnel to ensure circuit is properly sized for safe operation.

A power supply circuit includes all electrical equipment between the breaker box or fuse panel in the building and the machine. The power supply circuit used for this machine must be sized to safely handle the full-load current drawn from the machine for an extended period of time. (If this machine is connected to a circuit protected by fuses, use a time delay fuse marked D.)

Availability

Electrocution, fire, shock,

supply.

Full-Load Current Rating

Circuit Information

property, consult an electrician if you are unsure about wiring practices or electrical codes in your area.

G0942 Full-Load Current Rating at 230V .. 31A G0943 Full-Load Current Rating at 230V ..24A G0943 Full-Load Current Rating at 460V

Model G0942/G0943 (Mfd. Since 03/21)

..12A

Circuit Requirements for 230V

Models G0942/G0943 are both prewired to operate on a power supply circuit that has a verified ground and meets the following requirements:

Nominal Voltage .........20 8V, 2 20V, 2 3 0V, 24 0V

..........................................................60 Hz

Cycle Phase G0942 G0943 Power Supply Circuit G0942 G0943

...................................... Single-Phase

............................................... 3-Phase

.............................................. 40 Amps

.............................................. 30 Amps

Circuit Requirements for 460V

Model G0943 can be converted to operate on a power supply circuit that has a verified ground and meets the requirements listed below. (Refer to Voltage Conversion instructions for details.)

Nominal Voltage ................... 440V, 460V, 480V

..........................................................60 Hz

Cycle Phase Power Supply Circuit

.................................................... 3-Phase

......................... 15 Amps

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Since this machine must be permanently connected to the power supply, an extension cord cannot be used.

Connection Type

A permanently connected (hardwired) power supply is typically installed with wires running through mounted and secured conduit. A disconnecting means, such as a locking switch (see following figure), must be provided to allow the machine to be disconnected (isolated) from the power supply when required. This installation must be performed by an electrician in accordance with all applicable electrical codes and ordinances.

process. DO NOT connect to power until

In the event of a malfunction or breakdown, grounding provides a path of least resistance for electrical current to reduce the risk of electric shock. A permanently connected machine must be connected to a grounded metal permanent wiring system; or to a system having an equipmentgrounding conductor. All grounds must be verified and rated for the electrical requirements of the machine. Improper grounding can increase the risk of electric shock!

Locking

Disconnect Switch

Power

Source

Ground

Model G0943 Voltage Conversion

The Model G0943 can be converted to 460V operation. This conversion consists of: 1) Disconnecting the machine from power, 2) replacing the magnetic switch, and 3) rewiring the motor for 460V operation.

All wiring changes must be inspected by a qualified electrician or service personnel before the machine is connected to the power source. If, at any time during this procedure you need assistan ce, c all Griz zly Te ch S upp or t at (570) 546-9663.

Items Needed Qty

Machine

ConduitConduit

Ground

Flat Head Screwdriver 1⁄4" .................................. 1

Phillips Head Screwdriver #2 Wrench or Socket 13mm Open or Closed-End Wrench 13mm Magnetic Switch 460V (#118 on Page 58) Wire Nuts Electrical Tape

........................................................... 3

................................... As Needed

............................ 1

................................... 1

................. 1

........ 1

Figure 9. Typical setup of a permanently

connected machine.

Grounding Instructions

Serious injury could occur if you connect machine to power before completing setup

instructed later in this manual.

Extension Cords

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To convert Model G0943 to 460V operation:

1. DISCONNECT MACHINE FROM POWER!

2. Turn lock screw shown in Figure 10 90˚

counterclockwise to remove magnetic switch cover.

Magnetic

Switch

Cover

Lock Screw

Figure 10. Location of magnetic switch cover

and lock screw.

Model G0942/G0943 (Mfd. Since 03/21)

3. Remove (2) screws on each strain relief

process. DO NOT connect to power until

clamp to remove clamps (see Figure 11).

Strain Relief

Clamp Screw

(1 of 4)

Strain Relief

Clamp

(1 of 2)

Figure 11. Location of strain relief clamps and

screws.

6. Remove cover on 460V magnetic switch box, and install box on saddle.

Insert motor and pressure switch cords

through 460V magnetic switch box strain relief holes, then attach wires to terminals according to wiring diagram on Page 50.

Install 460V magnetic switch cover.

9. Remove (4) bolts shown in Figure 13 to

remove motor junction box cover.

Motor

Junction Box

Cover

4. Disconnect all wires from contactor, overload relay, and ground terminals inside 230V magnetic switch box, then remove motor and pressure switch cords from strain relief holes.

5. Remove (2) hex nuts, (2) lock washers, (4) flat washers, and (2) hex bolts shown in Figure 12 to remove 230V magnetic switch box from machine saddle.

x 2

x 4

Figure 13. Location of motor junction box cover

and bolts.

10.

Rewire motor for 460V operation (refer to wir-

ing diagram on Page 50).

Note: If there is a diagram on motor/inside

junction box that conflicts with the one in this manual, motor may have changed since manual was printed. Use diagram provided on motor/in junction box.

Install motor junction box cover with bolts

11.

removed in Step 9.

Figure 12. Location of magnetic switch box

fasteners.

Model G0942/G0943 (Mfd. Since 03/21)

Serious injury could occur if you connect machine to power before completing setup

instructed later in this manual.

-15-

SECTION 3: SETUP

The following is a list of items shipped with your machine. Before beginning setup, lay these items out and inventory them.

If any non-proprietary parts are missing (e.g. a nut or a washer), we will gladly replace them; or for the sake of expediency, replacements can be obtained at your local hardware store.

This machine was carefully packaged for safe transport. When unpacking, separate all enclosed items from packaging materials and inspect them for shipping damage.

please

at (570) 546-9663.

IMPORTANT:

you are completely satisfied with the machine and have resolved any issues between Grizzly or the shipping agent. You MUST have the original pack-

aging to file a freight claim. It is also extremely helpful if you need to return your machine later.

Unpacking

If items are damaged

call us immediately

Save all packaging materials until

Needed for Setup

The following items are needed, but not included, for the setup/assembly of this machine.

Inventory

Inventory (Figure 14) Qty

A. Air Compressor .......................................... 1

Description Qty

• Additional People ....................................... 1

• Safety Glasses (for each person) ............... 1

• Open-End Wrench

• Lifting Equipment (rated for 1200 lbs.) ....... 1

• Mounting Hardware .................... As Needed

• Flat Head Screwdriver 1⁄4" ........................... 1

• Phillips Head Screwdriver #2 ..................... 1

• Air Compressor Oil SAE 30........ As Needed

• Hearing Protection ...................................... 1

-16 -

⁄16" ............................... 1

Machine presents serious injury hazards to untrained users. Read entire manual to become familiar with controls and operations before starting machine!

Wear safety glasses during the entire setup process!

Figure 14. Inventory (G0942 shown).

NOTICE

If you cannot find an item on this list, carefully check around/inside the machine and packaging materials. Often, these items get lost in packaging materials while unpacking or they are pre-installed at the factory.

Model G0942/G0943 (Mfd. Since 03/21)

Site Considerations

Weight Load

Refer to the of your machine. Make sure that the surface upon which the machine is placed will bear the weight of the machine, additional equipment that may be installed on the machine, and the heaviest workpiece that will be used. Additionally, consider the weight of the operator and any dynamic loading that may occur when operating the machine.

Space Allocation

Consider the largest size of workpiece that will be processed through this machine and provide enough space around the machine for adequate operator material handling or the installation of auxiliary equipment. With permanent installations, leave enough space around the machine to open or remove doors/covers as required by the maintenance and service described in this manual.

See below for required space allocation.

Physical Environment

Extreme conditions for this type of machinery are

Place this machine near an existing power source.

other hazards. Make sure to leave enough space

Shadows, glare, or strobe effects that may distract

Machine Data Sheet for the weight

Children or untrained people may be seriously injured by this machine. Only install in an access restricted location.

Min. 18" from

Obstructions

The physical environment where the machine is operated is important for safe operation and longevity of machine components. For best results, operate this machine in a dry environment that is free from excessive moisture, hazardous chemicals, airborne abrasives, or extreme conditions.

generally those where the ambient temperature range exceeds 41°–104°F; the relative humidity range exceeds 20%–95% (non-condensing); or the environment is subject to vibration, shocks, or bumps.

Electrical Installation

Make sure all power cords are protected from traffic, material handling, moisture, chemicals, or

around machine to disconnect power supply or apply a lockout/tagout device, if required.

Lighting

Lighting around the machine must be adequate enough that operations can be performed safely.

or impede the operator must be eliminated.

Wall

Min. 18" from

Obstructions

Model G0942/G0943 (Mfd. Since 03/21)

32"

40"

G0942

Figure 15. Minimum working clearances.

31"

Electrical Connection

42"

G0943

-17-

Lifting & Placing

HEAVY LIF T! Straining or crushing injury may occur from improperly lifting machine or some of its parts. To reduce this risk, get help from other people and use a forklift (or other lifting equipment) rated for weight of this machine.

Use lifting equipment rated for at least 1200 lbs. to lift machine off the pallet and onto a suitable location, then secure the machine to the shop ﬂoor.

The air compressor must be located at least 18 inches from the nearest wall as described in Additional Safety for Air Compressors on Page 12.

Remove top and sides of crate from shipping

pallet.

Unbolt machine from pallet.

4. Place lifting sling under machine saddle (see Figure 16), then attach sling securely to fork-

lift (or other power lifting equipment).

Note: Be sure sling does not put pressure on

exhaust tube, discharge line, motor, pump, or belt guard or they can become damaged from force while lifting.

Lifting

Sling

Before anchoring the machine to the ﬂoor, you should also consider how you plan to design the air delivery system (see Distribution System

Design on Page 26).

To lift and place machine:

1. Place pallet near final machine mounting

location.

Machine Saddle

Figure 16. Example of lifting sling placed under

machine saddle.

With another person to help steady machine,

lift machine just enough to clear pallet and any floor obstacles, then place machine in its final position on shop floor.

-18-

Model G0942/G0943 (Mfd. Since 03/21)

Anchoring to Floor

Lag shield anchors with lag screws (see below) are a popular way to anchor machinery to a concrete floor, because the anchors sit flush with the floor surface, making it easy to unbolt and move the machine later, if needed. However, anytime local codes apply, you MUST follow the anchoring methodology specified by the code.

Before the machine can be connected to the power source, an electrical circuit and connection device must be prepared per the POWER

SUPPLY

setup instructions in this manual must be complete to ensure that the machine has been assembled and installed properly. The disconnect switch installed by the electrician (as recommended) is the primary means for disconnecting or connecting the machine to the power source.

Number of Mounting Holes ............................ 4

Diameter of Mounting Hardware

.................5⁄8"

Power Connection

Anchoring machinery to the floor prevents tipping or shifting and reduces vibration that may occur during operation, resulting in a machine that runs slightly quieter and feels more solid. Since this machine is extremely top heavy, anchoring it to the floor will also prevent injury and property damage.

If the machine will be installed in a commercial or workplace setting, or if it is permanently connected (hardwired) to the power supply, local codes may also require that it be anchored to the floor.

Anchoring to Concrete Floors

section in this manual; and all previous

Connecting power supply wires to machine without first disconnecting power supply may result in serious injury or death.

Connecting Incoming Power Wires

Tools Needed Qty

Flat Head Screwdriver 1⁄4" .................................. 1

Phillips Head Screwdriver #2

To connect incoming power wires:

............................ 1

Lag Screw

Flat Washer

Machine Base

Concrete

Figure 17. Popular method for anchoring

machinery to a concrete floor.

IMPORTANT: DO NOT tighten lag screws so much that they may cause stress to the tank.

Tip: Install vibration pads between the lag screws and floor to further cut down on vibration and noise.

Model G0942/G0943 (Mfd. Since 03/21)

Lag Shield Anchor

Drilled Hole

1. DISCONNECT POWER SUPPLY WIRES OR LOCK DISCONNECT SWITCH BOX IN OFF POSITION!

Turn lock screw shown in Figure 18 90˚

counterclockwise to remove magnetic switch cover.

Magnetic

Switch

Cover

Lock Screw

Figure 18. Location of magnetic switch cover

and lock screw (Model G0942 shown).

-19-

Ground

3. Remove (2) screws shown in Figure 19 to remove strain relief clamp, then insert incoming power conduit through strain relief.

G0943 230V Only: Connect incoming power

wires to 1/L1, 3/L2, 5/L3, and ground terminals shown in Figure 21.

Strain Relief

Clamp Screw

(1 of 2)

Figure 19. Location of magnetic switch box

strain relief and clamp screws (Model G0942

shown).

During next step, make sure incoming ground wire is connected to correct terminal to ensure machine will be properly grounded (see "Ground" in Figure 20). An ungrounded or improperly grounded machine can cause electrocution if live electrical wires make contact with parts touched by operator.

Incoming Power

Wires

1/L1 3/L2 5/L3

208-240V

CONTACTOR

EATON

A27SNE30 D1

2/T1 4/T2 6/T3

Figure 21. Incoming power wires connected to

1/L1, 3/L2, 5/L3, and ground terminals for Model

G0943 wired for 230V.

G0943 460V Only: Connect incoming power

wires to 1/L1, 3/L2, 5/L3, and ground terminals shown in Figure 22.

4. G0942 Only: Connect incoming power wires to 1L1, 3L2, and ground terminals shown in Figure 20.

Incoming Power Wires

1L1

3L2

A113NO

Figure 20. Incoming power wires connected to

1L1, 3L2, and ground terminals for Model G0942.

Incoming Power

Wires

1/L1 3/L2 5/L3

460V

CONTACTOR

EATON

C25DNC325 E1

2/T1 4/T2 6/T3

Figure 22. Incoming power wires connected to

1/L1, 3/L2, 5/L3, and ground terminals for Model

G0943 wired for 460V.

-20-

Model G0942/G0943 (Mfd. Since 03/21)

5. Install strain relief clamp with screws removed

Once assembly is complete, test run the machine to ensure it is properly connected to power and safety components are functioning correctly.

If you find an unusual problem during the test run, immediately stop the machine, disconnect it from power, and fix the problem BEFORE operating the machine again. The

table in the

SERVICE section of this manual can help.

DO NOT start machine until all preceding setup instructions have been performed. Operating an improperly set up machine

Move the disconnect switch handle to the ON position, as illustrated below. The machine is now connected to the power source.

Move the disconnect switch handle to the OFF position, as illustrated below. The machine is now disconnected from the power source.

Note:

Lock the switch in the OFF position to

restrict others from starting the machine.

Serious injury or death can result from

in Step 3 to clamp incoming power conduit in place.

Install magnetic switch cover.

We do not recommend connecting G0943 to a phase converter to supply 3-phase power as it could damage or decrease life of sensitive electrical components.

Test Run

Troubleshooting

Connecting to Power Source

Figure 23. Connecting power to machine.

Disconnecting from Power Source

The Test Run consists of verifying the following: 1) The compressor oil level is sufficient, 2) the motor powers up and runs correctly, 3) the 3-phase power supply polarity is correct (Model G0943 only), 4) the pump safety relief valve works correctly (Model G0942 only), 5) the motor and pump turn OFF when the cut-out pressure is reached, and 6) the tank safety relief valve works correctly.

using this machine BEFORE understanding its controls and related safety information. DO NOT operate, or allow others to operate, machine until the information is understood.

Figure 24. Disconnecting power from machine.

Model G0942/G0943 (Mfd. Since 03/21)

may result in malfunction or unexpected results that can lead to serious injury, death, or machine/property damage.

Eye injury hazard! Always wear safety glasses when handling pressurized air system.

-21-

To test run machine:

Check oil level (refer to Lubrication begin-

ning on Page 33 for instructions).

Clear all setup tools away from machine.

3. Move pressure switch lever to OFF position

(see Figure 25).

G0942 G0943

Pressure

Switch

Lever

Pressure

Switch

Lever

Turn output port shut-off valve handle all

the way counterclockwise to open (see Figure 27).

Shut-Off

Valve Handle

Figure 27. Shut-off valve handle in

open position.

6. Connect machine to power supply.

Figure 25. Location of pressure switch controls.

4. Turn drain valve handle to open position to

open drain valve (see Figure 26).

Drain Valve

Handle

Drain Valve

Handle

G0942 G0943

Figure 26. Drain valve handle in open position.

7. Move pressure switch lever to AUTO/ON

position to turn machine ON and verify motor operation.

Motor should run smoothly and without

unusual problems or noises.

— For G0942: Proceed to Step 13.

— For G0943: Verify that motor pulley, pump

flywheel, and V-belt rotate clockwise when viewed from front of machine. If they rotate clockwise, power supply polarity is correct, proceed to Step 14. If they rotate counterclockwise, proceed to Step 8.

Move pressure switch lever to OFF position.

9. DISCONNECT MACHINE FROM POWER!

-22-

Model G0942/G0943 (Mfd. Since 03/21)

10. Turn lock screw shown in Figure 28 90˚

counterclockwise to remove magnetic switch cover.

Magnetic

Switch

Cover

Lock Screw

G0943 460V Only: Swap black wire connect-

ed to 1/L1 terminal with red wire connected to 3/L2 terminal on contactor (see Figure 30).

Red 3/L2

Wire

Connection

1/L1 3/L2 5/L3

Figure 28. Location of magnetic switch cover

and lock screw.

11. G0943 230V Only: Swap black wire connected to 1/L1 terminal with white wire connected to 3/L2 terminal on contactor (see Figure 29).

White 3/L2

Wire

Connection

1/L1 3/L2 5/L3

Black 1/L1

208-240V

Wire

Connection

CONTACTOR

EATON

A27SNE30 D1

2/T1 4/T2 6/T3

Figure 29. Location of black 1/L1 and white 3/L2

wire (wired for 230V operation).

Black 1/L1

460V

Wire

Connection

CONTACTOR

EATON

C25DNC325 E1

2/T1 4/T2 6/T3

Figure 30. Location of black 1/L1 and red 3/L2

wire (wired for 460V operation).

12.

Install magnetic switch cover and reconnect

machine to power, then repeat Step 7.

Do not touch compressor head or discharge line during use or immediately after compressor is active. These hot parts may cause burns.

Releasing air through safety relief valve can be loud. Protect hearing with ANSIapproved ear protection in following step.

Model G0942/G0943 (Mfd. Since 03/21)

-23-

13. G0942 Only: While pump is running, slowly pull pump safety relief valve ring to bleed pressure from pump (see Figure 31).

— If machine turns OFF when tank pressure

reaches cut-out pressure (175 PSI), then safety feature of check valve is working correctly. Proceed to Step 17.

Pump Safety

Relief Valve

Figure 31. Location of G0942 pump safety relief

valve.

— If pump safety relief valve bleeds pres-

sure, and air stops leaking when ring is released, then safety relief valve is working correctly. Proceed to Step 14.

— If safety relief valve is stuck or leaks

after releasing ring, immediately turn OFF machine and disconnect it from power. Safety relief valve must be replaced before using machine.

— If machine does not turn OFF when tank

pressure reaches cut-out pressure, then immediately turn OFF machine and disconnect it from power. Safety feature of check valve is NOT working properly and must be replaced before using machine.

Releasing air through safety relief valve can be loud. Protect hearing with ANSIapproved ear protection in following step.

17. Turn machine OFF and slowly pull tank safety

relief valve ring to bleed pressure from tank (see Figure 33).

Tank Safety Relief Valve

Ring

After running compressor for 20 minutes,

14.

move pressure switch lever to OFF position to turn machine OFF.

Turn drain valve handle and shut-off valve

15.

handle to closed position.

Turn machine ON and observe tank pressure

16.

gauge (see Figure 32) while tank fills.

G0942 G0943

Tank

Pressure Gauge

Tank

Pressure Gauge

Figure 32. Location of tank pressure gauge.

Figure 33. Location of tank safety relief valve

ring (Model G0942 shown).

— If tank safety relief valve bleeds pres-

sure, and air stops leaking when ring is released, then safety relief valve is working correctly. Proceed to Step 18.

— If safety relief valve is stuck or leaks

after releasing ring, immediately turn OFF machine and disconnect it from power. Safety relief valve must be replaced before using machine.

Open drain valve to drain moisture from tank.

18.

19. Recheck oil level before proceeding with

operations.

-24-

Model G0942/G0943 (Mfd. Since 03/21)

SECTION 4: OPERATIONS

The purpose of this overview is to provide the novice machine operator with a basic understanding of how the machine is used during operation, so the

discussed later

in this manual

Due to the generic nature of this overview, it is not intended to be an instructional guide. To learn more about specific operations, read this entire manual,

training from experienced machine operators outside of this manual by reading "how-to" books, trade magazines, or websites.

To reduce your risk of serious injury, read this entire manual BEFORE

Eye injury hazard! Always wear safety glasses when

Operation Overview

machine controls/components

are easier to understand.

seek additional

, and do additional research

3. Puts on any additional personal protective equipment required by operation and attachment tool.

Connects machine to power and turns it ON.

Allows machine to run until cut-out pressure

has been reached and tank is full.

Adjusts in-line regulator in air supply line to 0

PSI.

Connects air hose to quick-connect coupler

in air delivery system.

Connects attachment air tool to air hose.

9. Opens output port shut-off valve to release

air into distribution system.

using machine.

using this machine.

Do not touch compressor head or discharge line during use or immediately after compressor is active. These hot parts may cause

To complete a typical operation, the operator does the following:

Puts on safety glasses.

2. Pulls safety valve ring(s) to test valve(s) and

clear any obstructions.

Model G0942/G0943 (Mfd. Since 03/21)

burns.

Adjusts in-line regulator so line pressure at

10.

hose is lower than or equal to air tool rating.

While being careful not to create a tripping

11.

hazard with hose, performs operation.

Closes output port shut-off valve and bleeds

12.

air from delivery system.

Turns compressor power OFF and discon-

13.

nects it from power.

Uses tank safety relief valve to reduce tank

14.

pressure to less than 10 PSI.

Opens drain valves to drain any condensa-

15.

tion from tank and delivery system, then closes drain valves.

If you are not experienced with this type of machine, WE STRONGLY RECOMMEND that you seek additional training outside of this manual. Read books/magazines or get formal training before beginning any projects. Regardless of the content in this section, Grizzly Industrial will not be held liable for accidents caused by lack of training.

-25-

Distribution System

Design

Once you know how large your system will be, and what components you will install, choose a material for the distribution lines. Stainless steel, copper, and aluminum can withstand the force and heat of compressed air.

When designing your air distribution system, consider how many and what types of tools you intend to use, and what requirements those tools will have (see Connecting Air Tools on Page 29). The length of hose you use to connect tools to the system may affect how far the system needs to reach (see Choosing Air Hoses on Page 28).

Determine what methods you will use to remove moisture, oil, and dirt from the compressor air (see Distribution System Components on Page 27).

Plan to add a regulator for each supply line, and determine if you will need to add a lubricator. Installing quick-connect couplers will allow you to easily connect and disconnect air tools.

The compressor must be anchored at least 18 inches away from the nearest wall and 20 inches away from any combustible spraying operations.

Air Supply Line

Air Flow

Shut-Off

Valve

Decide how you will route the distribution lines. Forcing air flow up, against gravity, after it leaves the compressor, will naturally prevent moisture from proceeding through the line and reaching your tool.

Build your system using your desired pipes, fittings, filters, drains, and regulators, then use a flexible conduit or coupling to connect your air compressor. This will decrease any structural pressure on the tank and distribution pipes that could stress and damage the components. The Model G0942/G0943 has a shut-off valve to stop the airflow when attaching tools or servicing individual components.

Further information about air distribution systems is out of the scope of this manual. Consult outside resources and books for more suggestions.

Air Tool

Lubricator

(For Lubricated

Air Tool

In-Line

Air/Moisture

Filter

Lines Only)

-26-

Air Compressor

Flexible

Coupling

Drain Leg

Figure 34. Typical air distribution system.

Regulator

Model G0942/G0943 (Mfd. Since 03/21)

Hose

w/Plug

Quick-Connect

Coupler

Distribution System

Components

The distribution system is what delivers the air from your compressor to the tool you wish to use. Air delivery components can be damaged if dirt, oil, or water enter the air supply line. An air distribution system allows you to clean the air, remove moisture and heat, and regulate the pressure, all after the air leaves the compressor tank and before it enters the air tool.

Air Dryer

Before the air reaches an air tool, it must be dried by some method or another. One option is to install a moisture trap, which provides a place for moisture to collect where it can be easily drained (see Figure 34 on Page 26).

Another option is to install a moisture filter (see Figure 35). The filter can be cleaned and replaced, while any accumulated moisture is drained from a drain valve. Many of these can filter dirt, oil, and moisture at the same time.

Air In

Air Out

Filter

Element

Air Filter

Ensuring clean air reaches your air tools will also extend tool life. If your method of moisture removal does not also filter out oil, dirt, and debris, we recommend also adding an in-line air filter (see Figure 36).

Regulator (Optional)

Air In Air Out

Filter

Element

Drain Valve

Figure 36. Example of an air filter.

Regulator

A regulator (see Figure 37) is what adjusts the air supply line to your desired operating pressure. The operating pressure should always be equal to or less than the pressure that your air tool is rated for. An air tool recommended for 70 PSI should never be connected to a hose or system set to higher than that operating pressure, as the tool or valves could burst. A regulator allows tools with a lower rating than the system to still be attached, because the line can be adjusted to a safe level.

Drain Valve

Figure 35. Example of a moisture filter.

The last option is to install an actual air dryer. These are better suited for large industrial applications.

Model G0942/G0943 (Mfd. Since 03/21)

Air In

Outgoing Air

PSI Gauge

Air Out

Figure 37. Example of a regulator.

Regulator

Knob

-27-

Lubricator

After water, debris, and oil from the compressor and environment have been removed, some air tools require lubrication be added back into the system to perform their job properly. Air line oil can be added directly to the tool before and during use, or an in-line lubricator (see Figure 38) can be added to the air supply line so oil is added automatically. Only use a lubricator for tools that require it. Adding lubrication to a paint sprayer, for instance, can contaminate the tool and paint and prevent a proper application.

Filter/Regulator

(Optional)

Fill Cap

Lubrication

Rate

Control Knob

Choosing Air Hoses

There are many options when it comes to hoses. The most important aspects for an air compressor are going to be length, diameter, and fittings. The material of the hose is also an important consideration, but this will depend more on your application and preference.

Length

Consider your applications before deciding on a hose length. Longer hoses, or hose connections to extend hose length, can increase your mobility, but will probably result in some pressure loss.

If your work area will be small, you may be able to use a shorter hose without stretching the hose. Never put any unnecessary stress on the hose, valves, fittings, or air delivery system.

Air In

Figure 38. Example of an in-line lubricator.

Air Out

Lubrication

Reservoir

An air compressor becomes very hot during operation, and the pressure switch and motor often produce sparks. Some applications, like spraying or sanding, involve flammable material that create a fire or combustion hazard when they are performed too close to a compressor. The hose length must allow for the air compressor to remain at least 20 feet away from the operation.

Diameter

A larger inner diameter will allow for higher airflow delivery. Refer to Airflow Delivery (CFM) for more information. The higher CFM a tool requires, the larger the inner diameter of the hose will need to be (see Figure 39).

Airflow Delivery Required ID

0–3 CFM

3.1–5.9 CFM

6+ CFM

Figure 39. Recommended hose inner diameters.

⁄4" (3mm)

⁄4"–3⁄8" (3mm–10mm)

⁄8"+ (10mm+)

-28-

Model G0942/G0943 (Mfd. Since 03/21)

Fittings

Many hoses come with fittings installed (see Figure 40). The simplest option is to find a hose with two fittings: one that matches the air line output port, and one that matches your intended attachment tool. If the hose does not match the port, a coupler may be needed.

Fitting

Figure 40. Air hose with fitting installed.

You will need to determine the size of the fittings and whether they are male or female (see Figure 41). A male fitting can only attach to a female fitting, and vice versa. There are also a number of coupler/plug styles on the market, so be sure the two match or you will likely not have an airtight connection.

Male

Coupler

Figure 41. Example of male and female fittings.

Male Plug

Female

Coupler

Female

Plug

Connecting Air Tools

There are various air tools that can be connected to your air compressor by means of the air distribution system, and the setup will vary little across tools, but there are a couple things to keep in mind before connecting a tool or hose.

Airflow Delivery (CFM)

The first consideration when choosing an air tool is whether or not the air delivery is compatible with your compressor. Smaller compressors, capable of less than 5 CFM, only supply enough pressure for smaller air tools like nailers, staplers, chippers, chisels, grinders, sanders, tire inflators, and paint sprayers. Air hammers, impact wrenches, impact hammers, and blow guns will probably require a larger compressor capable of 10-110 CFM.

Duty Cycle

The duty cycle of your compressor will also have an effect on how efficient the airflow delivery is. Refer to Figure 42 for some common duty cycles and what they mean.

Compressor can be used for up to half

50/50

60/40

75/25

85/15

100

Compressing air produces a lot of heat, so the pump and motor require some resting time in order to cool down. The "cycle" of an air compressor refers to how long it takes for the compressor to be used and subsequently cooled. The duty cycle dictates what percentage of the cycle you can spend using air before it must rest.

of its cycle (spends same amount of time resting as it does working).

Compressor can be used for up to 60% of its cycle; spends 40% of time resting.

Compressor can be used for up to 75% of its cycle; spends 25% of time resting.

Compressor can be used for up to 85% of its cycle; spends 15% of time resting.

Compressor does not need to rest. Engine/motor has a cooling component allowing for constant air delivery.

Figure 42. Common duty cycles.

Model G0942/G0943 (Mfd. Since 03/21)

-29-

Connecting Air Tool

Use the following steps as a guide for attaching an air tool. As there are a wide variety of tool and hose options, your connections may differ slightly from this simple outline.

Items Needed Qty

Air Too l .............................................................. 1

Air Hose Additional Connection Fittings

............................................................. 1

........... As Needed

Eye injury hazard! Always wear safety glasses when handling pressurized air system.

Disconnecting Air Tool

Eye injury hazard! Always wear safety glasses when handling pressurized air system.

Pressurized air escaping through valves/ fittings can be extremely loud. Protect hearing with ANSI-approved hearing protection in following steps.

To disconnect air tool:

Adjust in-line regulator in air supply line to 0

PSI.

Always wear personal protective equipment required by air tool you are using. Pneumatic grinders, sanders, paint sprayers, etc., require respirator to protect against longterm respiratory damage. Prolonged exposure to loud tools can result in hearing loss without the use of hearing protection.

To connect air tool:

Adjust in-line regulator in air supply line to 0

PSI.

Insert air hose male plug into quick-connect

coupler.

Connect other end of hose to air tool.

Note: Refer to air tool instructions for speci-

fications, method of connection, and proper use of tool.

Disconnect air tool from hose.

3. Push coupler sleeve away from plug to

release hose plug.

Note: Air will escape when connection is bro-

ken if air supply line is still pressurized.

-30-

Model G0942/G0943 (Mfd. Since 03/21)

ACCESSORIES

Installing unapproved accessories may

order online at www.grizzly.com or call 1-800-523-4777

SECTION 5: ACCESSORIES

cause machine to malfunction, resulting in serious personal injury or machine damage. To reduce this risk, only install accessories recommended for this machine by Grizzly.

NOTICE

Refer to our website or latest catalog for additional recommended accessories.

Basic Eye Protection

T32323—Woodturners Face Shield T32401—EDGE Brazeau Safety Glasses, Clear T32402—EDGE Khor G2 Safety Glasses, Tint T32404—EDGE Mazeno Safety Glasses, Clear

T32323 T32401

T32079—Paint & Body Respirator Kit - Medium T32080—Paint & Body Respirator Kit - Large

This kit includes (1) silicone rubber half mask respirator, (2) T32088 organic vapor cartridges, (2) P100 pancake filters with organic vapor/AG nuisance odor relief, and (4) P95 particulate filter pads and filter retainers.

T32402

Figure 44. Assortment of basic eye protection.

T28041—Primrose Air Compressor Oil

This oil is a blend of the highest quality solvent refined, paraffinic, and naphthenic petroleum mineral oils and additives which prevent rust and oxidation. It's formulated for clean, trouble-free air compressor lubrication and effective control of carbon deposits for longer life. 1 quart size.

T32404

Figure 43. Paint & Body Respirator Kit.

Figure 45. T28041 236 Primrose Plus Air

Compressor Oil.

Model G0942/G0943 (Mfd. Since 03/21)

-31-

SECTION 6: MAINTENANCE

Schedule

Compressor will turn ON automatically when pressure switch is set to ON or AUTO. To reduce risk of shock/accidental startup, always disconnect machine from power before adjustments, maintenance, or service.

Eye injury hazard! Always wear safety glasses when maintaining pressurized air system.

For optimum performance from this machine, this maintenance schedule must be strictly followed.

Ongoing

To minimize your risk of injury and maintain proper machine operation, shut down the machine immediately if you ever observe any of the items below, and fix the problem before continuing operations:

• Low oil level.

• Damaged safety relief valve, pressure switch, or drain valve.

Worn or damaged wires, cords, and plugs.

•

Tank rust/corrosion.

•

Any other unsafe condition.

•

Do not touch compressor head or discharge line during use or immediately after compressor is active. These hot parts may cause burns. Allow compressor to cool before handling.

Do not use flammable cleanser to clean machine. Compressor components often produce sparks that could ignite once machine is connected to power and turned ON.

Daily Maintenance

• Open drain valve to drain any condensation.

• Check oil level.

• Test function of safety relief valve(s) and clear any obstructions.

Releasing air through safety relief valve or drain valve can be extremely loud. Protect hearing with ANSI-approved hearing protection when testing/draining valves.

Weekly Maintenance

• Check air filters.

• Clean/vacuum dust buildup off compressor.

Monthly Maintenance

• Check V-belt tension, damage, or wear.

Quarterly (3 Month/300 Hour) Maintenance

• Change compressor oil.

-32-

Semi-Annual (6 Month) Maintenance

• Check hoses/connections for leaks. If soapy water at suspected leak creates bubbles, air is escaping. Repair or replace affected parts.

Model G0942/G0943 (Mfd. Since 03/21)

Draining Tank

Lubrication

Some water may accumulate in the tank and air delivery system depending on usage and humidity. Drain water from the tank, and any attached delivery system, daily to increase the lifespan of the compressor and air tools and to prevent tank and pipe corrosion.

To drain tank:

DISCONNECT MACHINE FROM POWER!

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection in following step.

2. Use tank safety relief valve to reduce tank

pressure to less than 10 PSI.

Move drain valve handle to open position

(see Figure 46) to open drain valve.

The oil level in the Model G0942/G0943 should be checked daily to prevent overheating and damage to the compressor. Change the oil every 300 hours of use.

Checking Oil Level

Item Needed Qty

Model T28041 or SAE 30 Equiv. ....... As Needed

To check oil level:

Check oil sight glass (see Figure 47). Oil

level should be kept between bottom and top of red circle.

Oil Fill

Plug

Oil Sight

Glass

Drain Valve

Handle

Drain Valve

Handle

G0942 G0943

Figure 46. Drain valve handle in open position.

Figure 47. Location of oil sight glass and oil fill

plug (Model G0942 shown).

— If oil level is between top and bottom of red

circle, no additional oil is needed.

— If oil level is below bottom of red circle,

proceed to Step 2.

DISCONNECT MACHINE FROM POWER!

3. Remove oil fill plug (see Figure 47).

Add compressor oil until oil level is between

bottom and top of red circle, then install fill plug.

Model G0942/G0943 (Mfd. Since 03/21)

-33-

Changing Oil

Items Needed Qty

Drain Pan ........................................................... 1

Shop Rags Wrench or Socket Wrench or Socket 14mm (G0943 Only) Wire Brush Thread Sealing Tape Model T28041 or SAE 30 Equivalent

G0942 .................................................1.5 Qt.

G0943 ................................................... 4 Qt.

......................................... As Needed

......................................................... 1

⁄16" (G0942 Only) ................ 1

............ 1

......................... As Needed

Checking Air Filters

The air filters help prevent impurities and dust from entering the compressor and reduce noise. A dirty filter will result in a less efficient system and could become a fire hazard.

Items Needed Qty

Replacement Filters........................... As Needed

To change oil:

DISCONNECT MACHINE FROM POWER!

2. Remove oil fill plug (see Figure 48).

Place drain pan under oil drain plug, then

remove oil drain plug (see Figure 48).

Oil Fill

Plug

Oil Sight

Glass

Oil Drain

Plug

To check air filters:

DISCONNECT MACHINE FROM POWER!

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection in following step.

2. Use tank safety relief valve to reduce tank

pressure to less than 10 PSI.

G0942 Only: Rotate filter cap shown in

3. Figure 49 counterclockwise to remove filter

cap and access filter.

Cap

Figure 48. Location of oil fill plug, oil drain plug,

and oil sight glass (Model G0942 shown).

Clean drain plug threads.

5. When oil is fully drained, wrap drain plug threads with thread sealing tape, then install drain plug.

Add compressor oil until oil level is between

bottom and top of red circle on oil sight glass (see Figure 48), then install fill plug.

-34-

Figure 49. Location of Model G0942 filter cap.

Model G0942/G0943 (Mfd. Since 03/21)

— If filter is fairly clean and there has not

been a drop in efficiency of compressor, replace cap. No replacement is required.

Adjusting

Belt Tension/

— If filter is dirty or clogged, or there has

been a drop in efficiency of compressor, replace cap. Proceed to Step 4.

G0943 Only: Remove wing nut shown in

Figure 50 to remove filter cap and access

filter.

Cap

Figure 50. Location of Model G0943 filter cap

and wing nut.

— If filter is fairly clean and there has not

been a drop in efficiency of compressor, replace cap. No replacement is required.

— If filter is dirty or clogged, or there has

been a drop in efficiency of compressor, replace cap. Proceed to Step 4.

G0942 Only: Replace old filter with

new filter element (refer to Part #64 on

Page 52), then install filter cap.

G0943 Only: Replace old filter with

new filter element (refer to Part #63 on

Page 54), then install filter cap.

Pulley Alignment

The V-belt transfers power from the motor to the compressor pump. To ensure efficient transfer of power, make sure the V-belt is always properly tensioned and in good condition. If the V-belt is worn, cracked, or damaged, replace it.

Pulley alignment is another important factor in power transmission and belt life. The motor pulley should be parallel to the pump flywheel and they should be in the same plane (coplanar) for optimum performance.

The belt tension and motor pulley alignment are both adjusted by repositioning the motor on the saddle. Be advised that these items cannot be adjusted independently.

Items Needed Qty

Wrenches or Sockets 13, 14mm, 9⁄16" ..........1 Ea.

Open or Closed-End Wrench 13mm Replacement Belt Another Person Straightedge 36" Measuring Tape

To adjust belt tension/pulley alignment:

DISCONNECT MACHINE FROM POWER!

Remove hex nut, lock washer, and hex bolt

shown in Figure 51.

Note: Model G0942 has an additional (2)

fender washers on hex bolt.

.............................. As Needed

.................................................. 1

................................................ 1

................................................. 1

................. 1

Repeat Step 3 for remaining filter(s).

Model G0942/G0943 (Mfd. Since 03/21)

-35-

Pulley

Flywheel

⁄4"

Deflection

Figure 51. Location of belt guard bracket

fasteners.

Remove (4) hex bolts and flat washers shown

in Figure 52 to remove belt guard.

Belt Guard

x 4

Figure 52. Location of belt guard and

fasteners (Model G0943 shown).

Figure 53. Checking V-belt tension.

— If V-belt is not cracked, torn, excessively

worn, or damaged, and there is

⁄4" of deflection, belt does not need to be adjusted or replaced. Proceed to Step 10.

— If V-belt is cracked, torn, excessively worn,

damaged, or there is not

⁄4" of deflection,

proceed to Step 5.

Loosen (4) hex nuts on hex bolts shown in

Figure 54, then push motor towards pump to

release belt tension.

— If V-belt is damaged, replace belt (refer to

Part #126 on Page 56 for G0942 or Page

58 for G0943).

Belt, pulley, and flywheel will be hot after operation. Allow them to cool before handling.

4. Press belt in center to check belt tension. Belt

is correctly tensioned when there is approxi-

mately

⁄4" deflection when it is pushed with

moderate pressure, as shown in Figure 53.

-36-

x 4

V-Belt

Figure 54. Location of belt tension components

(Model G0943 shown).

Model G0942/G0943 (Mfd. Since 03/21)

6. Have another person push motor away from pump so there is approximately 1⁄4" deflection,

then tighten hex nuts from Step 5.

Place straightedge so it is flush against pump

flywheel and it extends over motor pulley (see Figure 55).

Pump Flywheel

Loosen (4) hex nuts from Step 5 and, while

maintaining correct belt tension, have assistant adjust motor until pulley and flywheel are coplanar, then tighten hex nuts to secure.

Install belt guard with flat washers and hex

10.

bolts removed in Step 3.

Install hex nut, washer(s), and hex bolt

11.

removed in Step 2.

Motor

Pulley

Figure 55. Example of using straightedge to

8. Measure distance between straightedge and V-belt at "A", "B", and "C" locations shown in Figure 56.

Motor Pulley

Straightedge

check pulley alignment.

Pump

Flywheel

Checking for Leaks

Air leaks will cause low air output and increase the time the compressor must run. Use the following method to check the valves and fittings on your compressor and air delivery system.

Checking for Leaks

1. Close output port shut-off valve (see Figure 57).

Shut-Off

Valve

Figure 56. Distances to measure.

— If measurements are all within 1⁄16" of each

other, pulley and flywheel are coplanar and do not need to be adjusted. Proceed to Step 10.

— If measurements are not all within 1⁄16" of

each other, pulley and flywheel are not coplanar. Proceed to Step 9.

Model G0942/G0943 (Mfd. Since 03/21)

B C

Figure 57. Location of shut-off valve.

2. Turn ON compressor and allow tank to fill

until cut-out pressure is reached.

DISCONNECT MACHINE FROM POWER!

4. Listen for sound of air to find possible leak at

compressor.

— If you do not hear air escaping, and pres-

sure in tank does not change, there is no leak at compressor.

-37-

— If you do hear air escaping, or pressure in

tank drops even with safety relief valve(s) and drain valve closed, proceed to Step 5.

Spray suspected air leak with soap and water

solution and look for air bubbles.

Fixing Leaks

Items Needed Qty

Wire Brush ......................................................... 1

Thread Sealing Tape or Pipe Dope

To fix leaks:

... As Needed

— If bubbles do not form, repeat at different

location.

— If bubbles do form, refer to Fixing

Leaks to stop compressor leak before proceeding to check delivery system.

Disconnect any tools and hoses from quick-

connect couplers of delivery system.

Open compressor output port shut-off valve.

Connect compressor to power, turn it ON,

and allow tank and air delivery system to fill until cut-out pressure of compressor is reached.

DISCONNECT MACHINE FROM POWER!

10. Listen for sound of air to find possible leak.

— If you do not hear air escaping, and pres-

sure in tank does not change, there is no leak at delivery system.

— If you do hear air escaping, or pressure in

tank drops even with safety relief valve(s) and all drain valves closed, proceed to Step 11.

DISCONNECT MACHINE FROM POWER!

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection while performing following step.

2. Use tank safety relief valve to reduce tank

pressure to less than 10 PSI.

Open drain valve(s) to relieve any remaining

air.

Remove fitting, valve, conduit, or filter that is

leaking.

Clean threads, apply thread sealing tape or

pipe dope to threads, then re-install part.

Note: If a fitting, valve, conduit, or filter con-

tinues to leak after preceding steps, replace part.

Spray suspected air leak with soap and water

11.

solution and look for air bubbles.

— If bubbles do not form, repeat at different

location.

— If bubbles do form, refer to Fixing Leaks.

-38-

Model G0942/G0943 (Mfd. Since 03/21)

Machine Storage

All machinery will develop serious rust problems and corrosion damage if it is not properly prepared for storage. Use the steps in this section to ensure that your machine remains in good condition.

To bring machine out of storage, perform the Tes t

Run beginning on Page 21.

2. Use tank safety relief valve to reduce tank

pressure to less than 10 PSI.

Open drain valve to drain any condensation

from tank.

Close output port shut-off valve.

5. Disconnect conduits from output port.

6. Clean machine.

Eye injury hazard! Always wear safety glasses when handling pressurized air system.

Items Needed Qty

Cleaner/Degreaser ............................ As Needed

.................................................. As Needed

Rags Tarp or Plastic Sheet

To prepare machine for storage:

1. DISCONNECT MACHINE FROM POWER!

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection while performing following step.

......................................... 1

Do not use a flammable cleanser to clean machine. Compressor components often produce sparks that could ignite once machine is connected to power and turned ON.

7. Close drain valve.

8. Cover machine with tarp or plastic sheet that

will keep out dust and resist liquid or moisture. If machine will be stored in/near direct sunlight, use cover that will block UV rays.

Model G0942/G0943 (Mfd. Since 03/21)

-39-

Review the troubleshooting procedures in this section if a problem develops with your machine. If you need

the

serial number and manufacture date of your machine before calling.

SECTION 7: SERVICE

replacement parts or additional help with a procedure, call our Technical Support. Note: Please gather

Troubleshooting

Motor & Electrical

Symptom Possible Cause Possible Solution

Machine does not start, or power supply breaker immediately trips after startup.

Machine stalls or is underpowered.

1. Tank already pressurized.

2. Incorrect power supply voltage or circuit size.

3. Incoming power wires wired incorrectly.

4. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

5. Power supply circuit breaker tripped or fuse blown.

6. Motor wires connected incorrectly.

7. Thermal overload relay has tripped/at fault.

8. Start capacitor at fault (G0942 only).

9. Centrifugal switch adjustment/contact points at fault (G0942 only).

10. Contactor not energized/at fault.

11. Wiring broken, disconnected, or corroded.

12. Tripped motor thermal overload; compressor is exceeding its duty cycle.

13. Check valve components are dirty/damaged.

14. Pressure switch at fault.

15. Motor or motor bearings at fault.

1. Air ﬁlter(s) dirty/clogged.

2. Pump/motor have restricted airﬂow.

3. Belt slipping/pulley misaligned.

4. Motor wires connected incorrectly.

5. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

6. Incoming power wires wired incorrectly.

7. Pulley/ﬂywheel slipping on shaft.

8. Tripped motor thermal overload; compressor is exceeding its duty cycle.

9. Crankcase oil is not correct type.

10. Run capacitor at fault (G0942 only).

11. Contactor not energized/at fault.

1. Motor will not start if tank is fully pressurized.

2. Ensure correct power supply voltage and circuit size (Page 13).

3. Test for good contacts/correct wiring (Page 46).

4. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

5. Ensure circuit is free of shorts. Reset circuit breaker or replace fuse.

6. Correct motor wiring connections (Page 46).

7. Reset. Adjust or replace if at fault.

8. Test/replace if at fault.

9. Adjust centrifugal switch/clean contact points. Replace either if at fault.

10. Test all legs for power; replace if necessary.

11. Fix broken wires or disconnected/corroded connections (Page 46).

12. Reduce load on compressor and allow longer cool down periods.

13. Clean/replace check valve components.

14. Turn compressor OFF, disconnect from power, and empty tank. DO NOT USE until switch is replaced.

15. Replace motor.

1. Replace air ﬁlter(s) (Page 34).

2. Clean cylinder ﬁns, motor fan, and vent area.

3. Clean/tension/replace belt (Page 35); ensure pulley is aligned to pump ﬂywheel (Page 35).

4. Correct motor wiring connections (Page 46).

5. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

6. Test for good contacts/correct wiring (Page 46).

7. Tighten/replace loose pulley/ﬂywheel/shaft.

8. Reduce load on compressor and allow longer cool down periods.

9. Drain and replace with correct oil (Page 34).

10. Test/repair/replace.

11. Test all legs for power; replace if necessary.

-40-

Model G0942/G0943 (Mfd. Since 03/21)

Motor & Electrical (Cont.)

Symptom Possible Cause Possible Solution

Machine stalls or is underpowered.

Machine has vibration or noisy operation.

Motor pulley and pump ﬂywheel do not rotate clockwise when viewed from front of machine (G0943 only).

Motor runs continuously.

Pressure relief valve stays open and motor will not stop running.

12. Check valve components are dirty/damaged.

13. Centrifugal switch/contact points at fault (G0942 only).

14. Motor or motor bearings at fault.

15. Worn valves or rings/compressor pump at fault.

1. Motor or component loose.

2. Loose mounting hardware/feet need shims or vibration pads.

3. V-belt worn, loose, pulley misaligned, or belt slapping guard.

4. Pulley/ﬂywheel loose.

5. Motor fan rubbing on fan cover.

6. Centrifugal switch needs adjustment/at fault (G0942 only).

7. Motor bearings at fault.

8. Compressor pump at fault.

1. Power connections wired out of phase. 1. Correct phase polarity (Page 22).

1. Machine is undersized.

2. In-line regulator(s) needs to be adjusted for lower airﬂow delivery.

3. Air leak in tank or delivery pipes.

4. Pressure switch at fault.

1. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

2. Pressure switch at fault, unit is trying to overpressurize tank.

3. Pressure relief valve at fault/relieving pressure too early.

12. Clean/replace check valve components.

13. Adjust centrifugal switch/clean contact points. Replace either if at fault.

14. Replace motor.

15. Rebuild/replace.

1. Replace damaged or missing bolts/nuts or tighten if loose.

2. Tighten fasteners/add shims or vibration pads.

3. Inspect/replace belt (Page 35). Realign pulley to pump ﬂywheel if necessary (Page 35).

4. Secure pulley/ﬂywheel on shaft.

5. Fix/replace fan cover; replace loose/damaged fan.

6. Adjust/replace if at fault.

7. Test by rotating shaft; rotational grinding/loose shaft requires bearing replacement.

8. Compressor piston rod/bearing/crankshaft is worn. Rebuild or replace pump.

1. Use smaller attachment tool(s) or larger air compressor.

2. Adjust regulator(s) to decrease line PSI.

3. Check air tank, pipes, and all connections for leaks (Page 37). Do not attempt to repair leaking/damaged tank, only replace.

4. Turn compressor OFF, disconnect from power, and empty tank. DO NOT USE until switch is replaced.

1. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

2. Turn compressor OFF, disconnect from power, and empty tank. DO NOT USE until switch is replaced.

3. Replace.

Operation

Symptom Possible Cause Possible Solution

Air leaks from pressure switch.

Model G0942/G0943 (Mfd. Since 03/21)

1. Check valve components are dirty/damaged.

2. Pressure switch at fault.

1. Clean/replace check valve components.

2. Turn compressor OFF, disconnect from power, and empty tank. DO NOT USE until switch is replaced.

-41-

Operation (Cont.)

Symptom Possible Cause Possible Solution

Low pressure in tank, or tank pressure drops after compressor is turned OFF.

Air leaks from air ﬁlter(s).

Compressor does not build pressure, or does not reach full pressure.

Air tools have oily discharge.

Air tools have watery discharge or get cold and freeze up with ice during use.

Air tool has low supply pressure but compressor has sufﬁcient air pressure.

1. Drain valve or output shut-off valve is open.

2. Air ﬁlter(s) dirty/clogged.

3. In-line regulator(s) needs to be adjusted for lower airﬂow delivery.

4. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

5. Air leak in tank or delivery pipes.

6. Check valve components are dirty/damaged.

7. Pressure relief valve releasing below cut-out pressure.

8. Gasket(s) leaking.

9. Worn pump piston rings.

1. Check valve components are dirty/damaged.

2. Reed valve(s) not sealing.

1. Drain valve or output shut-off valve is open.

2. Tank needs to be drained.

3. Air ﬁlter(s) dirty/clogged.

4. Air leak in tank or delivery pipes.

5. Check valve components are dirty/damaged.

6. Reed valve(s) not sealing.

7. Head gasket or valve body gasket leaking.

8. Worn pump piston rings.

9. Broken crankshaft or connecting rod.

1. Tank needs to be drained.

2. Air ﬁlter(s) dirty/clogged.

3. Too much oil in crankcase.

4. In-line oiler is out of adjustment (if used).

5. In-line ﬁlter(s) is damaged or missing (if used).

6. Crankcase oil is not correct type.

7. Crankcase breather clogged/obstructed (G0943 only).

8. Compressor pump at fault.

1. Tank needs to be drained.

2. In-line water separator(s) is full (if used).

3. Ambient environment has too much humidity.

1. Air hose is too long.

2. In-line regulator(s) needs to be adjusted for higher airﬂow delivery.

3. Machine is undersized.

1. Close valve.

2. Replace air ﬁlter(s) (Page 34).

3. Adjust regulator(s) to decrease line PSI.

4. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

5. Check air tank, pipes, and all connections for leaks (Page 37). Do not attempt to repair leaking/damaged tank, only replace.

6. Clean/replace check valve components.

7. Replace pressure relief valve.

8. Check gaskets on cylinder head assemblies, repair or replace as needed.

9. Inspect and replace pump piston rings.

1. Clean/replace check valve components.

2. Remove cylinder head and replace reed valve(s).

1. Close valve.

2. Open drain valve to drain condensation, then close.

3. Replace air ﬁlter(s) (Page 34).

4. Check air tank, pipes, and all connections for leaks (Page 37). Do not attempt to repair leaking/damaged tank, only replace.

5. Clean/replace check valve components.

6. Remove cylinder head and replace reed valve(s).

7. Remove cylinder head and replace gasket(s).

8. Inspect and replace pump piston rings.

9. Replace or rebuild compressor pump.

1. Open drain valve to drain condensation, then close.

2. Replace air ﬁlter(s) (Page 34).

3. Drain oil to proper level (Page 34).

4. Adjust in-line oiler drip ratio or use correct viscosity oil.

5. Replace ﬁlter(s) or in-line ﬁlter assembly.

6. Drain and replace with correct oil (Page 34).

7. Clear obstructions from crankcase breather.

8. Worn compressor piston, rings, or valves. Rebuild or replace pump.

1. Open drain valve to drain condensation, then close.

2. Drain water separator(s).

3. Install in-line air dryer(s) and water separator(s).

1. Use shorter hose.

2. Adjust regulator(s) to increase line PSI. DO NOT exceed pressure rating of attached tool.

3. Use smaller attachment tool(s) or larger air compressor.

-42-

Model G0942/G0943 (Mfd. Since 03/21)

Operation (Cont.)

Symptom Possible Cause Possible Solution

Air tool has low supply pressure but compressor has sufﬁcient air pressure.

Tank safety relief valve leaks.

Pump safety relief valve leaks (G0942 only).

Delivered air is dirty or has excessive moisture.

Compressor knocking.

Excessive noise while running.

Oil leaks onto compressor or ﬂoor.

Excessive air leaks from breather (G0943 only).

4. In-line ﬁlter(s) is damaged or clogged (if used).

5. In-line water separator(s) is full (if used).

6. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

7. Air leaks in hose or delivery system.

8. In-line regulator(s) at fault.

9. Pressure gauge(s) at fault.

1. Pressure switch cut-in/cut-out settings have been adjusted incorrectly.

2. Safety relief valve at fault.

3. Pressure switch at fault.

1. Check valve is stuck or obstructed.

2. Blockage or failure during 2nd stage of pressurization.

3. Safety relief valve at fault.

1. Tank needs to be drained.

2. In-line ﬁlter(s) or water separator(s) needed in air supply line.

3. Delivery pipes are dirty (if used).

1. Air ﬁlter(s) dirty/clogged.

2. Crankcase oil is low.

3. Pulley/ﬂywheel loose.

4. Excess carbon build-up on piston or valves.

5. Piston assembly loose.

1. Crankcase oil is not correct type. 1. Drain and replace with correct oil (Page 34).

1. Oil spilled when ﬁlling.

2. Air ﬁlter(s) dirty/clogged.

3. Too much oil in crankcase.

4. Crankcase oil is not correct type.

5. Oil ﬁll plug/gasket is worn or damaged.

6. Pump gasket(s) worn or damaged.

7. Cylinder head cap screws loose.

8. Valve, plate, or ring is loose/damaged.

9. Damaged crankcase seal.

10. Damaged crankshaft.

1. Some air leaking through breather during operation is normal. If breather is leaking enough air that ﬁll time is affected, piston ring may be damaged.

4. Replace ﬁlter(s) or in-line ﬁlter assembly.

5. Drain water separator(s).

6. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

7. Check air hoses and all connections for leaks (Page 37).

8. Inspect in-line regulator(s) for leaks. Replace if at fault.

9. Replace pressure gauge(s).

1. Adjust settings (Page 44). Do not exceed cut-in/cutout pressures listed on data sheet (Page 6) or inside pressure switch.

2. Test/replace.

3. Turn compressor OFF, disconnect from power, and empty tank. DO NOT USE until switch is replaced.

1. Clean/replace check valve components.

2. Inspect 2nd stage ﬁttings, cylinder head, and exhaust tube, and replace any failing 2nd stage components.

3. Test/replace.

1. Open drain valve to drain condensation, then close.

2. Install in-line air ﬁlter(s) and water separator(s).

3. Remove delivery pipes, clean out, and replace.

1. Replace air ﬁlter(s) (Page 34).

2. Add crankcase oil (Page 34).

3. Secure pulley/ﬂywheel on shaft.

4. Take compressor to authorized service center.

5. Inspect and repair piston and connecting rod.

1. Wipe unit clean with non-ﬂammable cleanser.

2. Replace air ﬁlter(s) (Page 34).

3. Drain oil to proper level (Page 34).

4. Drain and replace with correct oil (Page 34).

5. Replace gasket or ﬁll plug.

6. Replace gasket(s).

7. Install cap screws with thread sealing tape.

8. Tighten or replace valve/plate/ring.

9. Replace crankcase or seal.

10. Repair/replace crankshaft.

1. Replace piston ring.

Model G0942/G0943 (Mfd. Since 03/21)

-43-

Adjusting Cut-In/

Cut-Out Settings

The pressure switch ensures the compressor will turn ON when the tank pressure drops to the cut-in pressure, and will turn OFF when the pressure cut-out is reached. Should the pressure switch fail to turn OFF the machine, the tank safety relief valve will open shortly after the pressure exceeds the cut-out pressure and prevent over-pressurization.

Cut-in and cut-out settings have been factory set at proper PSI range. Only adjust pressure switch settings if compressor is cutting-in or cutting-out at incorrect pressures. Tank could burst if filled with more pressure than it is designed for.

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection while performing following step.

3. Use safety relief valve to reduce tank pres-

sure to less than 10 PSI.

G0942 Only: Remove Phillips head screw

shown in Figure 58 to remove pressure switch cover.

G0943 Only: Remove acorn nut shown in

Figure 58 to remove pressure switch cover.

Eye injury hazard! Always wear safety glasses when handling pressurized air system.

Adjusting Cut-In/Cut-Out Settings

If the minimum and maximum tank pressure settings both have to be raised or lowered at the same time, then follow these steps.

Tools Needed Qty

Phillips Head Screwdriver #2 (G0942 Only) ...... 1

Flat Head Screwdriver Wrench or Socket 8mm (G0943 Only)

To adjust cut-in/cut-out settings:

Operate compressor and record cut-in and

cut-out pressures.

DISCONNECT MACHINE FROM POWER!

⁄4" (G0942 Only) ........... 1

.............. 1

Pressure

Switch

Cover

G0942 G0943

Figure 58. Location of pressure switch cover

and fastener.

5. G0942 Only: Adjust screw shown in Figure 59 to change minimum and maximum tank

pressure settings.

Pressure

Switch

Cover

Cut-In/Cut-Out

Adjustment

Screw

-44-

Figure 59. Cut-in/cut-out adjustment screw

(Model G0942 shown).

Model G0942/G0943 (Mfd. Since 03/21)

G0943 Only: Adjust nut shown in Figure 60

to change minimum and maximum tank pressure settings.

Cut-In/Cut-Out

Adjustment Nut

To adjust cut-out setting:

Operate compressor and record cut-in and

cut-out pressures.

DISCONNECT MACHINE FROM POWER!

Releasing air through safety relief valve can be extremely loud. Protect hearing with ANSI-approved hearing protection while performing following step.

Figure 60. Cut-in/cut-out adjustment nut (Model

G0943 shown).

— Turn screw or nut half turn clockwise to

increase both settings.

— Turn screw or nut half turn counterclock-

wise to decrease both settings.

Install pressure switch cover.

7. Connect machine to power, start compres-

sor, and cycle compressor through cut-in/ cut-out pressures. If compressor does not automatically turn OFF at 175 PSI, turn machine OFF before pressure reaches 180 PSI. Adjust pressure switch settings until cutout pressure is 175 PSI or lower.

Adjusting Only Cut-Out Setting

The Model G0943 has a fixed differential of 30 PSI and therefore the cut-out setting cannot be adjusted separate from the cut-in setting.

For the Model G0942, if only the maximum tank pressure setting needs to be adjusted, then follow these steps. Keep in mind that the allowable pressure differential between cut-in pressure and cutout pressure must be kept between 30–40 PSI. Exceeding this range can cause the compressor to overheat.

Tool Needed Qty

Phillips Head Screwdriver #2 ............................ 1

3. Use safety relief valve to reduce tank pressure to less than 10 PSI.

Remove Phillips head screw shown in Figure

4. 58 on Page 44 to remove pressure switch

cover.

Adjust screw shown in Figure 61 to change

maximum tank pressure setting.

Cut-Out

Adjustment

Screw

Figure 61. Cut-out only adjustment screw.

— Turn screw half turn clockwise to increase

tank pressure.

— Turn screw half turn counterclockwise to

decrease tank pressure.

Install pressure switch cover.

7. Connect machine to power, start compres-

Model G0942/G0943 (Mfd. Since 03/21)

-45-

These pages are current at the time of printing. However, in the spirit of improvement, we may make changes to the electrical systems of future machines. Compare the manufacture date of your machine to the one

number and manufacture date of your

machine before calling. This information can be found on the main machine label.

machine

SECTION 8: WIRING

stated in this manual, and study this section carefully.

If there are differences between your machine and what is shown in this section, call Technical Support at (570) 546-9663 for assistance BEFORE making any changes to the wiring on your machine. An updated wiring diagram may be available. Note: Please gather the serial

Wiring Safety Instructions

SHOCK HAZARD. Working on wiring that is con-

nected to a power source is extremely dangerous. Touching electrified parts will result in personal injury including but not limited to severe burns, electrocution, or death. Disconnect the power from the machine before servicing electrical components!

MODIFICATIONS. Modifying the wiring beyond what is shown in the diagram may lead to unpredictable results, including serious injury or fire. This includes the installation of unapproved aftermarket parts.

WIRE CONNECTIONS. All connections must be tight to prevent wires from loosening during machine operation. Double-check all wires disconnected or connected during any wiring task to ensure tight connections.

CIRCUIT REQUIREMENTS. You MUST follow the requirements at the beginning of this manual when connecting your machine to a power source.

WIRE/COMPONENT DAMAGE. Damaged wires or components increase the risk of serious personal injury, fire, or machine damage. If you notice that any wires or components are damaged while performing a wiring task, replace those wires or components.

MOTOR WIRING. The motor wiring shown in these diagrams is current at the time of printing but may not match your machine. If you find this to be the case, use the wiring diagram inside the motor junction box.

CAPACITORS/INVERTERS. Some capacitors and power inverters store an electrical charge for up to 10 minutes after being disconnected from the power source. To reduce the risk of being shocked, wait at least this long before working on capacitors.

EXPERIENCING DIFFICULTIES. If you are experiencing difficulties understanding the information included in this section, contact our Technical Support at (570) 546-9663.

The photos and diagrams included in this section are best viewed in color. You can view these pages in color at www.grizzly.com.

-46-

Model G0942/G0943 (Mfd. Since 03/21)

Ground

MOTOR 230V

WEG ESWS-B38V24E-RM35

G0942 Wiring Diagram

Ground

START

CAPACITOR

270-324uF

250V

T1/U1

START

CAPACITOR

270-324uF

T4/U2

T8/V2

T3/V3

RUN

CAPACITOR

60uF 400V

250V

Ground

230

Hot

VAC

Hot

DISCONNECT

SWITCH

(as recommended

PRESSURE

SUNNY SP-205-25A

)

Ground

LINE

MOTOR

SWITCH

1L1

WEG

CWB38

3L2

A113NO

CONTACTOR

208-240V

A214NO

2T1 4T2

OL RELAY

WEG

RW27-2D

96NC 98NO 97NO 95NC

2T1

4T2

6T3

Model G0942/G0943 (Mfd. Since 03/21)

MAGNETIC SWITCH

READ ELECTRICAL SAFETY

ON PAGE 46!

-47-

G0942 Electrical Component Photos

Figure 62. Pressure switch wiring.

Figure 63. Motor junction box wiring.

Figure 64. Magnetic switch box wiring.

-48-

READ ELECTRICAL SAFETY

ON PAGE 46!

Model G0942/G0943 (Mfd. Since 03/21)

MOTOR

G0943 230V Wiring Diagram

Prewired 230V

T7/U3

T1/U1

T6/W2

T8/V3

T4/U2

T2/V1

T9/W3

T3/W1

T5/V2

Ground

PRESSURE

SWITCH

SQUARE D 9013 FHG54M1X

3-PHASE

230 VAC

Ground

Hot

1/L1 3/L2 5/L3

208-240V

CONTACTOR

EATON

A27SNE30 D1

2/T1 4/T2 6/T3

OL RELAY

EATON XTOB DP

TEST

95 96 97 98

NC NO

H A

RESET

4T2 6T32T1

Hot

DISCONNECT

SWITCH

(as recommended

Model G0942/G0943 (Mfd. Since 03/21)

)

MAGNETIC SWITCH

EATON A27SGE30B040

READ ELECTRICAL SAFETY

-49-

ON PAGE 46!

MOTOR

G0943 460V Wiring Diagram

Rewired 460V

T6/W2

T9/W3

Ground

PRESSURE

SWITCH

SQUARE D 9013 FHG54M1X

T1/U1

T7/U3 T4/U2

T5/V2

T8/V3

T2/V1

T3/W1

1/L1 3/L2 5/L3

460V

CONTACTOR

EATON

C25DNC325 E1

2/T1 4/T2 6/T3

-50-

3-PHASE

460 VAC

Ground

Hot

DISCONNECT

SWITCH

(as recommended

READ ELECTRICAL SAFETY

ON PAGE 46!

OL RELAY

EATON XTOB0320CC1 DP

TEST

95 96 97 98

NC NO

)

MAGNETIC SWITCH

H A

RESET

4T2 6T32T1

Model G0942/G0943 (Mfd. Since 03/21)

G0943 Electrical Component Photos

Figure 65. Pressure switch wiring.

Figure 66. Motor junction box wiring (230V).

Figure 67. Magnetic switch box wiring (230V).

Model G0942/G0943 (Mfd. Since 03/21)

READ ELECTRICAL SAFETY

ON PAGE 46!

-51-

SECTION 9: PARTS

To order parts, contact MEGA by phone at (832) 415-6995 or email at CS@megacompressor.com.

G0942 Pump

32 31

-52-

Model G0942/G0943 (Mfd. Since 03/21)

REF DE S CRIPTION QTY REF DE S CRIPTION QTY

G0942 Pump Parts List

1 CRANKCASE 1 34 VALVE PLATE ASSEMBLY (STAGE 1) 2 2 BALL BEARING 6304-OPEN 1 35 CYLINDER HEAD GASKET (STAGE 1) 2 3 BALL BEARING 6307-OPEN 1 36 CYLINDER HEAD (STAGE 1) 2 4 BEARING COVER GASKET 1 37 VALVE PLATE GASKET (UPPER) 1 5 CRANKSHAFT BEARING COVER 4MM 1 38 CYLINDER HEAD GASKET (STAGE 1) 1 6 BEARING SEAT GASKET 1 39 VALVE PLATE GASKET (LOWER) 1 7 CRANKSHAFT BEARING SEAT 1 40 VALVE PLATE 2 8 OIL SEAL 35 X 56 X 12 1 41 REED VALVE 2 9 PLATE 79.5 X 36 1 42 CYLINDER HEAD (STAGE 2) 1 10 CRANKSHAFT 1 43 HEX BOLT M8-1.25 X 55 4 11 CYLINDER GASKET (LOWER) 3 44 HEX BOLT M8-1.25 X 75 8 12 CYLINDER (STAGE 1) 2 45 ELBOW FITTING 90-DEG R 3/4" G 3/4" 4 13 CYLINDER (STAGE 2) 1 46 INTERCOOLER 1 14 PISTON (STAGE 1) 2 47 TEE FITTING 180-DEG R 3/4" 2 X G 3/4" 1 15 PISTON PIN (STAGE 1) 2 48 EXHAUST COPPER PIPE (LONG) 1 16 INT RETAI NING RI NG 15MM 6 49 EXHAUST COPPER PIPE (SHORT) 1 17 PISTON RING SET (STAGE 1) 3 PC 2 50 COPPER PIPE LINING 4 18 PISTON (STAGE 2) 1 51 EXHAUST NUT M27 4 19 PISTON PIN )STAGE 2) 1 52 COPPER PIPE FIN (LONG) 1 20 PISTON RING SET (STAGE 2) 3 PC 1 53 COPPER PIPE FIN (SHORT) 1 21 CONNECTI NG ROD (L EFT) 1 54 PUMP FLYWHEEL 1 23 CONNECTI NG ROD (RI GHT) 1 55 FLAT WASHER 10 X 52 X 5MM 1 24 CONNECTI NG ROD (CE NTER) 1 56 HEX BOLT M10-1.5 X 40 LH 1 25 EXT RETAI NING RI NG 30MM 1 57 FLAT WASHER 10MM 1 26 HEX BOLT M6-1 X 16 3 58 OIL DRAIN PLUG Z 3/8" 1 27 LOCK WASHER 6MM 3 59 OIL SIGHT GLASS G 3/4" ALUMINUM 1 28 HEX BOLT M8-1.25 X 25 6 60 ELBOW FITTING 90-DEG R 1/4" 1 29 LOCK WASHER 8MM 18 61 SAFETY RELIEF VALVE R 1/4" 1 30 STUD-SE M10-1.5 X 20, 15 12 62 AIR FILTER ASSEMBLY 2 31 LOCK WASHER 10MM 13 63 OIL FILL PLUG 1 32 HEX NUT M10-1. 5 12 64 FILTER ELEMENT 1 33 CYLINDER GASKET (UPPER) (STAGE 1) 2

Model G0942/G0943 (Mfd. Since 03/21)

-53-

G0943 Pump

14A

-54-

Model G0942/G0943 (Mfd. Since 03/21)

REF DES CRIPTION QTY RE F DESCRIP TI ON QTY

G0943 Pump Parts List

1 CRANK CASE 1 36 HEX BOLT M8-1.25 X 30 3 2 OIL DRAIN PLUG 1 38 HEX BOLT M10-1.5 X 45 18 3 OIL SI GHT GLASS 1 40 CYLINDER (STAGE 2) 1 4 OIL FILL PLUG 1 41 CONNECTI NG ROD (S TAGE 2) 1 5 CRANK SHAFT 1 42 NEEDLE ROLLER BEARING NK 20/20 1 6 BALL BEARING 6308-OPEN 1 44 PI STON (STAGE 2) 1 7 BEARING SEAT GASKET 1 46 PISTON PIN (STAGE 2) 1 7A BEARING COVER GASKET 1 47 COMPRESSOR OIL RING (STAGE 2) 1 8 BALL BEARING 6309-OPEN 1 48 PI STON RING SET (STAGE 2) 3 PC 3 9 CRANKSHAFT BEARING SEAT 1 50 VALVE SEAT ASSEMBLY (STAGE 2) 3 9A CRANKSHAFT BEARING COVER 1 51 VALVE SEAT ASSEMBLY (STAGE 1) 3 10 OIL SEAL 1 52 I NLET VALVE PLATE 3 11 FLAT WASHER 51 X 70 X 1.5MM 1 53 OUTLET VALVE PLATE (LOWER) 15 12 EXT RE TAI NI NG RI NG 50MM 1 54 OUTLET VALVE PLATE (UPPER) 15 13 WOODRUFF KEY 8 X 32MM 1 55 HEX BOLT M3-.5 X 13 36 14 HEX BOLT M10-1.5 X 25 6 60 AIR FILTER ASSEMBLY 2 14A HEX BOLT M8-1.25 X 25 4 61 FI L TER MOUNT 2 15 COMPRESSOR PULLEY 1 62 FILTER BASE 2 16 FLAT WASHER 12.5 X 75 X 7MM 1 63 FI LTER 2 17 LOCK WASHER 12M 1 64 FILTER COVER 2 18 HEX BOLT M12-1.75 X 45 1 65 WI NG NUT M6-1 2 19 BREA THER CAP 1 66 FILTER GASKET 2 20 ROD I NNER RI NG 3 71 ELBOW FITTING 90-DEG 1 21 CONNECTI NG ROD (S TAGE 1) 2 73 TE E FI TTI NG 1 22 OIL SPLASH PLATE 2 74 ELBOW FITTING 90-DEG 2 23 HEX BOLT M6-1 X 12 2 75 FIN PIPE ASSEMBLY (STAGE 1) 1 24 PISTON (FIRST STAGE) 2 76 STRAIGHT PIPE CONNECTOR PT 7/8"-14 2 25 I NT RE TAI NI NG RI NG 20MM 6 77 FIN PIPE ASSEMBLY (STAGE 2) 1 26 PISTON PIN (FIRST STAGE) 2 78 STRAIGHT PIPE CONNECTOR PT 1"-11 2 27 COMPRESSOR OIL RING (STAGE 1) 2 81 ELBOW FITTING 90-DEG 1 28 PISTON RING SET (STAGE 1) 3 PC 6 82 TEE FI TTING 2 29 CYLINDER GASKET (LOWER) 3 83 DISCHARGE PIPE 2 30 CYLINDER (STAGE 1) 2 84 STRAIGHT PIPE CONNECTOR PT 1/4"-19 5 31 HEX BOLT M10-1.5 X 30 12 85 UNLOADER VALVE 3 33 CYLINDER GASKET (UPPER) 3 86 UNLOADER VALVE SPRING 3 34 CYLINDER HEAD GASKET 3 87 OI L RI NG 3 35 CYLI NDER HEAD 3 88 STRAI GHT FI TTI NG 3

Model G0942/G0943 (Mfd. Since 03/21)

-55-

G0942 Tank & Motor

104

120

111

145

112

107

113

138

140

108

137

117

114

115

137

138

143

105

144

139

102

130

140

141

123

128

133

122

134

119

126

103

129

131

132

125

135

-56-

121

124

136

Model G0942/G0943 (Mfd. Since 03/21)

REF DESCRIP TION QTY REF DESCRIPTION QTY

G0942 Tank & Motor Parts List

102 TANK 1 126 V-BELT B74 1 103 MOTOR 7.5HP 230V 1-PH 1 128 BELT GUARD 1 104 PRESSURE SWITCH SUNNY SP-204 1 129 BELT GUARD MOUNTI NG BRACK ET 1 105 SAFETY RELIEF VALVE 1 130 REDUCING ADAPTER 3/4" X 1/4" 1 107 PIPE NIPPLE 1 131 FLA T WASHER 8MM 4 108 PRESSURE GAUGE 1 132 HEX BOLT M8-1.25 X 16 4 111 PUMP DI SCHARGE LI NE 1 133 HEX NUT M1 0-1 . 5 4 112 ELBOW FITTING 90-DEG 1 134 LOCK WASHER 10MM 4 113 THREADED CHECK VALVE 1 135 FLAT WASHER 10.5 X 38.3 X 1.2MM 8 114 DISCHARGE FITTI NG 1 136 HEX BOLT M10-1.5 X 38 4 115 DISCHARGE PIPE 1 137 HEX NUT M8 -1.25 4 117 MAG SWITCH EATON 1 138 LOCK WASHER 8MM 4 119 STRAIN RELIEF TYPE-1 3/4" 1 139 BEL T GUARD MOUNTI NG BRACKET 1 120 CHECK VALVE 3/4" 1 140 FENDER WAS HER 8MM 4 121 BALL DRAIN VALVE 1 141 HEX BOLT M8-1.25 X 12 1 122 OUTLET VALVE 1 143 FLAT WASHER 8.2 X 38 X 1MM 1 123 MAG SWITCH CORD 12G 3W 10" 1 144 HEX BOLT M8-1.25 X 8 1 124 MOTOR CORD 8G 3W 10" 1 145 HEX BOLT M8-1.25 X 30 2 125 MOTOR PULLEY ASSEMBLY 1

Model G0942/G0943 (Mfd. Since 03/21)

-57-

G0943 Tank & Motor

104

120

111

145

112

107

140

118

113

138

108

137

117

114

115

137

138

143

105

144

139

102

130

141

123

128

133

122

134

119

126

103

129

131

132

125

142

135

-58-

(460V Only)

121

124

136

Model G0942/G0943 (Mfd. Since 03/21)

REF DESCRIP TION QTY REF DESCRIPTION QTY

G0943 Tank & Motor Parts List

102 TA NK 1 126 V-BELT B90 1 103 MOTOR 10HP 230V/460V 3-PH 1 128 BELT GUARD 1 104 PRESSURE SWITCH SQUARE D4 PORT 1 129 B ELT G UARD MOUNTI NG BRACKET 1 105 SAFETY RELIEF VALVE 1 130 REDUCING ADAPTER 3/4" X 1/4" 1 107 PI PE NIPPLE 1 131 FLAT WASHER 8MM 4 108 PRESSURE GAUGE 1 132 HEX BOLT M8-1.25 X 16 4 111 P UMP DI SCHARGE LI NE 1 133 HEX NUT M1 0-1. 5 4 112 ELBOW FITTING 90-DEG 1 134 LOCK WASHER 10MM 4 113 THREADED CHECK VALVE 1 135 FLAT WASHER 10.5 X 38.3 X 1.2MM 8 114 DI SCHARGE FI TTING 1 136 HEX BOLT M10-1.5 X 38 4 115 DISCHARGE PIPE 1 137 HEX NUT M8-1.25 4 117 MAG SWITCH EATON 230V 1 138 LOCK WASHER 8MM 4 118 MAG SWITCH EATON 460V 1 139 B ELT GUARD MOUNTI NG BRA CKET 1 119 CO NNECTOR 3/ 4" 1 140 FENDE R WASHER 8MM 4 120 CO NNECTOR 3/ 8" 1 141 HEX BOLT M8-1.25 X 12 1 121 BALL DRAIN VALVE 1 142 SET SCREW 5/16-18 X 6 2 122 OUTLET VALVE 1 143 FLAT WASHER 8.2 X 38 X 1MM 1 123 MAG SWITCH CORD 12G 3W 12" 1 144 HEX BOLT M8-1.25 X 8 1 124 MOTOR CORD 8G 4W 12" 1 145 HEX BOLT M8-1.25 X 30 2 125 MOTOR PULLEY ASSEMBLY 1

Model G0942/G0943 (Mfd. Since 03/21)

-59-

G0942 Labels & Cosmetics

REF PART # DES CRIPTIO N REF PART # DES CRIPTI ON

209

208

SSEMBLED IN

WITH US & GLOBAL PARTS

207

WARNING!

DRAIN TANK

AFTER

EVERY USE!

206

205

Specifications

Motor: 7.5 HP, 230V, 1-Ph, 60 Hz Full-Load Current Rating: 31A Pump Type: Two-Stage Max. Airflow @ 90 PSI: 23 CFM Cut-Out Pressure: 175 PSI Cut-In Pressure: 145 PSI Duty Cycle: 60/40 Tank Size: 80 Gallons Connection Size: 3/4" NPT Weight: 565 lbs.

Mfd. for Grizzly in USA

80-GALLON 7.5 HP EXTREME-SERIES AIR COMPRESSOR

To reduce the risk of serious injury when using this machine:

1. Read and understand owner’s manual before operating.

2. Always wear ANSI-approved eye protection and any additional personal protective equipment required by attachment tools.

3. Properly ground machine—connect to permanently grounded metal wiring system or an equipment grounding conductor.

4. DO NOT use this air compressor for breathable air supply.

5. DO NOT touch compressor parts during or immediately following operation. These parts will be hot.

6. Disconnect power and drain tank before moving or servicing. DO NOT pull compressor by power conduit or air hose.

7. DO NOT adjust or remove safety valve or modify machine.

S/N

8. Only operate in well-ventilated area free of combustible materials. DO NOT smoke while spraying, and do not spray flammable material in confined area near flame/compressor.

Date

Locate compressor at least 20 feet from spray area.

9. Only operate with all guards, covers, and parts in place.

10. Never leave machine running unattended.

MODEL G0942

WARNING!

11. Avoid entanglement with moving parts—tie back long hair, roll up sleeves, and do not wear loose clothing, gloves, or jewelry.

12. DO NOT use if power supply wires, conduit, or any other

electrical equipment becomes damaged—promptly repair!

13. DO NOT stand on compressor or obstruct airflow to ventilation.

14. DO NOT exceed pressure rating of tools or attachments.

15. DO NOT aim compressed air at body parts or people.

16. Inspect compressor, air lines, valves, and tank for damage,

leaks, weakness, looseness, or excessive wear. Repair/replace

defective items before operating.

17. Drain moisture from tank after each use and promptly replace a damaged tank. DO NOT attempt to weld on, modify, or repair tank.

18. DO NOT expose to rain or use in wet locations.

19. DO NOT operate under influence of drugs or alcohol or when tired.

20. Prevent unauthorized use by children or untrained users.

G0942

204

201

202

grizzly.com

203

201 P0942201 ELECTRICITY LABEL 206 P0942206 EXTREME SERIES LABEL 202 P0942202 TOUCH-UP PAI NT, G RI ZZLY GREEN 207 P0942207 DRAIN TANK LABEL 203 P0942203 GRIZZLY.COM LABEL 208 P0942208 ASSEMBLED IN USA LABEL 204 P0942204 MODEL NUMBER LABEL 209 P0942209 TOUCH-UP P AI NT, GRI ZZLY BL ACK 205 P0942205 MACHINE ID LABEL

-60-

Model G0942/G0943 (Mfd. Since 03/21)

G0943 Labels & Cosmetics

209

Specifications

Motor: 10 HP, 230V or 460V, 3-Ph, 60 Hz Prewired Voltage: 230V Full-Load Current: 24A @ 230V, 12A @ 460V Pump Type: Two-Stage Max. Airflow @ 90 PSI: 40 CFM Cut-Out Pressure: 175 PSI Cut-In Pressure: 145 PSI Duty Cycle: 70/30 Tank Size: 120 Gallons Connection Size: 3/4" NPT Weight: 950 lbs.

S/N

Date

Mfd. for Grizzly in USA

120-GALLON 10 HP EXTREME-SERIES AIR COMPRESSOR

To reduce the risk of serious injury when using this machine:

1. Read and understand owner’s manual before operating.

2. Always wear ANSI-approved eye protection and any additional personal protective equipment required by attachment tools.

3. Properly ground machine—connect to permanently grounded metal wiring system or an equipment grounding conductor.

4. DO NOT use this air compressor for breathable air supply.

5. DO NOT touch compressor parts during or immediately following operation. These parts will be hot.

6. Disconnect power and drain tank before moving or servicing. DO NOT pull compressor by power conduit or air hose.

7. DO NOT adjust or remove safety valve or modify machine.

8. Only operate in well-ventilated area free of combustible materials. DO NOT smoke while spraying, and do not spray flammable material in confined area near flame/compressor. Locate compressor at least 20 feet from spray area.

9. Only operate with all guards, covers, and parts in place.

10. Never leave machine running unattended.

MODEL G0943

WARNING!

11. Avoid entanglement with moving parts—tie back long hair, roll up sleeves, and do not wear loose clothing, gloves, or jewelry.

12. DO NOT use if power supply wires, conduit, or any other

electrical equipment becomes damaged—promptly repair!

13. DO NOT stand on compressor or obstruct airflow to ventilation.

14. DO NOT exceed pressure rating of tools or attachments.

15. DO NOT aim compressed air at body parts or people.

16. Inspect compressor, air lines, valves, and tank for damage,

leaks, weakness, looseness, or excessive wear. Repair/replace

defective items before operating.

17. Drain moisture from tank after each use and promptly replace a damaged tank. DO NOT attempt to weld on, modify, or repair tank.

18. DO NOT expose to rain or use in wet locations.

19. DO NOT operate under influence of drugs or alcohol or when tired.

20. Prevent unauthorized use by children or untrained users.

201

208

SSEMBLED IN

WITH US & GLOBAL PARTS

207

206

G0943

205

grizzly.com

202

203

WARNING!

DRAIN TANK

AFTER

EVERY USE!

204

REF PART # DES CRIPTIO N REF PART # DES CRIPTI ON

201 P0943201 TOUCH-UP PAI NT, G RI ZZLY BLACK 206 P0943206 MODEL NUMBER LABEL 202 P0943202 ELECTRICITY LABEL 207 P0943207 EXTREME SERIES LABEL 203 P0943203 DRAIN TANK LABEL 208 P0943208 ASSEMBLED IN USA LABEL 204 P0943204 TOUCH-UP PAI NT, G RI ZZLY GREEN 209 P0943209 MACHINE ID LABEL 205 P0943205 GRIZZLY.COM LABEL

Safety labels help reduce the risk of serious injury caused by machine hazards. If any label comes off or becomes unreadable, the owner of this machine MUST replace it in the original location before resuming operations. For replacements, contact (800) 523-4777 or www.grizzly.com.

Model G0942/G0943 (Mfd. Since 03/21)

-61-

Grizzly G0943, G0942 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

INTRODUCTION

Contact Info

Manual Accuracy

Identification

Model G0942 Machine Data Sheet

SECTION 1: SAFETY

Safety Instructions for Machinery

Additional Safety for Air Compressors

SECTION 2: POWER SUPPLY

SECTION 3: SETUP

Unpacking

Needed for Setup

Inventory

Site Considerations

Lifting & Placing

Anchoring to Floor

Power Connection

Test Run

SECTION 4: OPERATIONS

Operation Overview

Choosing Air Hoses

Connecting Air Tools

SECTION 5: ACCESSORIES

SECTION 6: MAINTENANCE

Schedule

Draining Tank

Lubrication

Checking Air Filters

Checking for Leaks

Machine Storage

SECTION 7: SERVICE

Troubleshooting

Adjusting Cut-In/Cut-Out Settings

SECTION 8: WIRING

Wiring Safety Instructions

G0942 Wiring Diagram

G0942 Electrical Component Photos

G0943 230V Wiring Diagram

G0943 460V Wiring Diagram

G0943 Electrical Component Photos

SECTION 9: PARTS

G0942 Pump

G0943 Pump

G0942 Tank & Motor

G0943 Tank & Motor

G0942 Labels & Cosmetics

G0943 Labels & Cosmetics