Grizzly T33858 User guide

MODEL T33858

6-GAL OIL-FREE QUIET SERIES

PANCAKE AIR COMPRESSOR

OWNER'S MANUAL

(For models manufactured since 03/23)

COPYRIGHT © APRIL, 2023 BY GRIZZLY INDUSTRIAL, INC.

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

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

#CS22673 PRINTED IN CHINA

***Keep for Future Reference***

V1.0 4.23

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
Manual Accuracy
Identification
Controls & Components
Machine Data Sheet

................................................................................................................................ 2

........................................................................................................................ 2

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

............................................................................................................. 4

................................................................................................................... 6

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
Assembly
Test Run

SECTION 4: OPERATIONS

Operation Overview.................................................................................................................. 17

Choosing Air Hose
Connecting Air Tool

SECTION 5: ACCESSORIES

SECTION 6: MAINTENANCE......................................................................................................... 22

Schedule
Lubrication
Draining Tank
Checking Air Filter
Checking for Leaks
Machine Storage

................................................................................................................................ 13

................................................................................................................................... 13

.................................................................................................................................. 14

................................................................................................................................... 15

.................................................................................................................................. 22

................................................................................................................................ 22

....................................................................................................................... 8

............................................................................................... 8

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

...................................................................................................... 11

....................................................................................................................... 13

..................................................................................................................... 13

.................................................................................................................. 14

........................................................................................................... 17

................................................................................................................... 18

.................................................................................................................. 19

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

........................................................................................................................... 23

.................................................................................................................... 23

.................................................................................................................. 24

...................................................................................................................... 25

SECTION 7: SERVICE

Troubleshooting
Inspecting Check Valve
Adjusting Cut-In/Cut-Out Settings

SECTION 8: WIRING

Wiring Safety Instructions
Wiring Diagram

SECTION 9: PARTS

.......................................................................................................................................... 35

Main
Labels & Cosmetics

................................................................................................................... 26

........................................................................................................................ 26

...................................................................................................................... 33

........................................................................................................................ 34

....................................................................................................................... 35

................................................................................................................. 37

............................................................................................................ 29

............................................................................................ 31

........................................................................................................ 33

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

We

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: [phone]

Email: [e-mail]

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.

Grizzly Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Email: [e-mail]

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

Manufacture Date

Serial Number

-2-

Model T33858 (Mfd. Since 03/23)

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

Identification

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

Pressure

Switch

Tank

Pressure Gauge

Air Filter

Safety

Relief Valve

Motor/Pump

Housing

Regulator

Pressure Gauge

Quick-Connect

Ports

Regulator

Drain

Valve

Machine Foot

(1 of 3)

Tank

using machine.

Model T33858 (Mfd. Since 03/23)

-3-

Controls &

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

Components

using machine.

Automatic Pressurization

A

B

D

C

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.

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.

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.

Figure 1. Pressurization components (shroud

and control panel removed for clarity).

A. Pressure Switch Knob: Toggles pressure

switch between OFF and ON modes. Machine
is OFF in OFF mode, and will continue to
pressurize until 150 PSI (cut-out pressure) is
reached when in ON mode.

B. Pressure Switch: Turns motor ON when

tank pressure drops below 120 PSI (cut­in pressure) and switch is in ON position.
Switch contains pressure relief valve that will
activate discharge line when tank pressure
exceeds 150 PSI (cut-out pressure) or pres­sure switch is turned OFF.

C. Safety Relief Valve: Pops open to release

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

D. Discharge Line: Releases air from compres-

sor pump and outlet line when tank pressure
exceeds 150 PSI (cut-out pressure).

-4-

Model T33858 (Mfd. Since 03/23)

Air Input

E

I. Dual Compressor Pump: Uses pistons to

draw in and compress air before transferring
air to tank.

F

J. Exhaust Tube: Transfers compressed air

from pump to tank.

Air Output/Delivery

G

K

H

Figure 2. Air input components.

E. Air Filter: Cleans air entering compressor

pump.

F. Tank Pressure Gauge: Indicates pressure

of air in tank.

G. Tank: Holds up to 6 gallons of pressurized

air.

H. Drain Valve: Drains built-up moisture from

tank when ball valve is opened.

I

L

M

Figure 4. Air output components.

K. Regulator Pressure Gauge: Indicates pres-

sure of air at quick-connect ports.

L. Quick-Connect Port (1 of 2): Secures and

releases air hose.

M. Regulator Knob: Adjusts pressure of air

delivered to quick-connect ports. Turn clock­wise to increase pressure and counterclock­wise to decrease pressure.

J

Figure 3. Location of pump and exhaust tube

(shroud and control panel removed for clarity).

Model T33858 (Mfd. Since 03/23)

-5-

Machine Data Sheet

Customer Service #: [phone] · To Order Call: [phone] · Fax #: [phone]

MODEL T33858

6-GALLON OIL-FREE QUIET SERIES PANCAKE AIR

COMPRESSOR

Product Dimensions:

Weight ................................................................................................................................................................52 lbs.

Width (side-to-side) x Depth (front-to-back) x Height ................................................................... 16 x 16 x 20-1/2 in.

Footprint (Length x Width) .......................................................................................................................... 14 x 12 in.

Shipping Dimensions:

Type .....................................................................................................................................................Cardboard Box

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

Weight ................................................................................................................................................................56 lbs.

Length x Width x Height ...................................................................................................................... 18 x 18 x 23 in.

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

Electrical:

Power Requirement ..........................................................................................................120V, Single-Phase, 60 Hz

Full-Load Current Rating ........................................................................................................................................ 12A

Minimum Circuit Size .............................................................................................................................................15A

Connection Type .......................................................................................................................................Cord & Plug

Power Cord Included ............................................................................................................................................. Yes

Power Cord Length ............................................................................................................................................. 72 in.

Power Cord Gauge .........................................................................................................................................14 AWG

Plug Included ......................................................................................................................................................... Yes

Included Plug Type ............................................................................................................................................... 5-15

Switch Type ........................................................................................................................................ Pressure Switch

Motors:

Main

Horsepower ..........................................................................................................................................1-1/2 HP

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

Amps ............................................................................................................................................................12A

Speed ................................................................................................................................................ 3400 RPM

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

Power Transfer .......................................................................................................................................... Direct

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

-6-

Model T33858 (Mfd. Since 03/23)

Main Specifications:

Operation Information

Compressor Style ................................................................................................................................. Pancake

Pump Type ........................................................................................................................................One-Stage

Max. Airflow/Delivery (at 40 PSI) .......................................................................................................4.5 SCFM

Max. Airflow/Delivery (at 90 PSI) .......................................................................................................3.5 SCFM

Max. Pressure ....................................................................................................................................... 150 PSI

Cut-Out Pressure .................................................................................................................................. 150 PSI

Cut-In Pressure ..................................................................................................................................... 120 PSI

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

Tank Size ............................................................................................................................................6 Gallons

Number of Cylinders ........................................................................................................................................ 2

Pump Lubrication .................................................................................................................................. Oil-Free

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

Regulator ...................................................................................................................................................... Yes

Output Port Information

Connection Type ......................................................................................................................... Quick-Coupler

Connection Size ...................................................................................................1/4" NPT Threads, 1/4" Body

Number of Connections ................................................................................................................................... 2

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

Construction Information

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

Valves ........................................................................................................................................................ Brass

Motor/Pump Shroud .................................................................................................................................Plastic

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

Other Specifications:

Country of Origin .................................................................................................................................................China

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

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

Sound Rating ......................................................................................................................................................62 dB

Features:

Sound Rating of Only 62 dB at 10 ft.
6-Gallon Tank with Maximum Airflow of 3.5 SCFM at 90 PSI
Oil-Free Twin Cylinders
Ball-Valve Drain Control
Included Air Regulator for Airflow Adjustment
Two Quick-Coupler Hose Connections

Model T33858 (Mfd. Since 03/23)

-7-

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-

-8-

Model T33858 (Mfd. Since 03/23)

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 [phone].

Model T33858 (Mfd. Since 03/23)

-9-

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 TO OLS. 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.

-10 -

Model T33858 (Mfd. Since 03/23)

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.)

This machine is prewired to operate on a power
supply circuit that has a verified ground and meets
the following requirements:

process. DO NOT connect to power until

Availability

Electrocution, fire, shock,

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

instructed later in this manual.

120V Circuit Requirements

Nominal Voltage .................... 110V, 115V, 120V

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

Cycle
Phase
Power Supply Circuit
Plug/Receptacle

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

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

............................. NEMA 5-15

supply.

Full-Load Current Rating

Full-Load Current Rating ................... 12 Amps

Model T33858 (Mfd. Since 03/23)

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

-11-

Improper connection of the equipment-grounding
wire can result in a risk of electric shock. The
wire with green insulation (with or without yellow
stripes) is the equipment-grounding wire. If repair
or replacement of the power cord or plug is nec­essary, do not connect the equipment-grounding
wire to a live (current carrying) terminal.

Check with a qualified electrician or service per­sonnel if you do not understand these grounding
requirements, or if you are in doubt about whether
the tool is properly grounded. If you ever notice
that a cord or plug is damaged or worn, discon­nect it from power, and immediately replace it with
a new one.

We do not recommend using an extension cord
with this machine.
cord, only use it if absolutely necessary and only
on a temporary basis.

Extension cords cause voltage drop, which can
damage electrical components and shorten motor
life. Voltage drop increases as the extension cord
size gets longer and the gauge size gets smaller
(higher gauge numbers indicate smaller sizes).

Any extension cord used with this machine must
be in good condition and contain a ground wire
and matching plug/receptacle. Additionally, it must
meet the following size requirements:

Grounding & Plug Requirements

it will not fit the outlet, have a qualified

This machine MUST be grounded. In the event
of certain malfunctions or breakdowns, grounding
reduces the risk of electric shock by providing a
path of least resistance for electric current.

This machine is equipped with a power cord that
has an equipment-grounding wire and a grounding
plug. Only insert plug into a matching receptacle
(outlet) that is properly installed and grounded in
accordance with all local codes and ordinances.
DO NOT modify the provided plug!

GROUNDED

5-15 RECEPTACLE

Grounding Pin

5-15 PLUG

Extension Cords

If you must use an extension

Neutral Hot

Figure 5. Typical 5-15 plug and receptacle.

SHOCK HAZARD!
Two-prong outlets do not meet the grounding
requirements for this machine. Do not modify
or use an adapter on the plug provided—if

electrician install the proper outlet with a
verified ground.

-12-

Minimum Gauge Size ...........................14 AWG

Maximum Length (Shorter is Better).......50 ft.

Model T33858 (Mfd. Since 03/23)

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 [phone].

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.

Description Qty

• Safety Glasses ......................................1 Pr.

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

Inventory

Inventory (Figure 6) Qty

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

B. Air Filter Assembly ..................................... 1

B

A

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

Model T33858 (Mfd. Since 03/23)

Wear safety glasses during
the entire setup process!

Figure 6. Inventory.

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.

-13-

or disable start switch or

Site Considerations

Refer to the Machine Data Sheet for the weight
and footprint specifications of your machine.
Some workbenches may require additional rein­forcement to support the weight of the machine
and workpiece materials.

Consider anticipated workpiece sizes and addi­tional space needed for auxiliary stands, work
tables, or other machinery when establishing a
location for this machine in the shop. Below is
the minimum amount of space needed for the

The machine must be fully assembled before it
can be operated. Before beginning the assembly
process, refer to

and gather
all
goes smoothly, first clean any

cov­ered or coated in heavy-duty rust preventative (if
applicable).

Workbench Load

Assembly

Needed for Setup

listed items. To ensure the assembly process

parts that are

Placement Location

Wall

Min. 18" from Obstructions

16"

To assemble machine:

Thread air filter assembly clockwise into com-

1.

pressor pump and hand tighten, as shown in
Figure 8.

Air Filter

Assembly

Figure 8. Air filter assembly installed

on compressor pump.

16"

Figure 7. Minimum working clearances.

Children and visitors may be
seriously injured if unsuper­vised around this machine.
Lock entrances to the shop

power connection to prevent
unsupervised use.

-14-

Model T33858 (Mfd. Since 03/23)

Test Run

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

ed results that can lead to serious injury,

Serious injury or death can result from

Troubleshooting

The Test Run consists of verifying the following:

1) The motor powers up and runs correctly, 2)
the motor and pump turn OFF when the cut-out
pressure is reached, and 3) the safety relief valve
works correctly.

3. Move pressure switch knob to OFF position
(see Figure 9).

Pressure Switch

Knob

Figure 9. Location of pressure switch knob.

4. Turn drain valve handle to open position (see
Figure 10).

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.

may result in malfunction or unexpect-

death, or machine/property damage.

To test run machine:

1. Clear all setup tools away from machine.

2. Locate machine in well-ventilated area at

least 18 inches from nearest wall or any other
obstructions.

Drain Valve

Handle

Figure 10. Drain valve handle open.

5. Connect machine to power supply.

6. Move pressure switch knob to ON position to

turn machine ON and verify motor operation.

Motor should run smoothly and without

unusual problems or noises.

Model T33858 (Mfd. Since 03/23)

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

After running compressor for 15 minutes,

7.

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

Turn drain valve handle to closed position.

8.

-15-

9. Turn machine ON and observe tank pressure
gauge (see Figure 11

Figure 11. Location of tank pressure gauge.

— If motor and pump turn OFF when tank

pressure reaches 150 PSI, then safety
feature of check valve is working correctly.
Proceed to Step 10.

— If motor and pump do not turn OFF when

tank pressure reaches 150 PSI, then
immediately turn OFF machine and dis­connect it from power. Safety feature of
check valve is NOT working properly and
must be replaced before further using
machine.

) while tank fills.

Tank

Pressure Gauge

10. Turn machine OFF and slowly pull safety
relief valve ring to bleed pressure from tank
(see Figure 12).

Safety Relief

Valve

Figure 12. Location of safety relief valve.

— If safety relieve valve bleeds pressure from

tank, and air stops leaking when pressure
is released, then safety feature of safety
relief valve is working correctly. Proceed
to Step 11.

— If safety relief valve is stuck or leaks

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

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

Open drain valve to drain moisture from tank,

11.

then close drain valve.

Congratulations! Test Run is complete.

-16 -

Model T33858 (Mfd. Since 03/23)

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,
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

Operation Overview

machine controls/components

are easier to understand.

read this entire

seek additional

, and do additional research

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

Puts on safety glasses.

1.

2. Pulls safety relief valve ring to test valve and

clear any obstructions.

Turns regulator knob all the way counter-

3.

clockwise.

Puts on any additional personal protective

4.

equipment required by operation and attach­ment tool.

Connects machine to power and turns it ON.

5.

Allows machine to run until cut-out pressure

6.

has been reached and tank is full.

using machine.

Eye injury hazard! Always
wear safety glasses when
using this machine.

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.

Turns regulator knob clockwise until line

7.

pressure gauge displays pressure lower than
or equal to air tool rating.

Connects air hose to quick-connect coupler.

8.

9. Connects attachment air tool to air hose.

10. While being careful not to create a tripping

hazard with hose, performs operation.

Turns machine OFF and disconnects it from

11.

power.

Uses safety relief valve to reduce tank pres-

12.

sure to less than 10 PSI.

Disconnects attachment tool from hose.

13.

14. Disconnects hose from compressor.

15. Opens drain valve to drain any condensation

from tank.

Closes drain valve.

16.

Model T33858 (Mfd. Since 03/23)

-17-

Choosing Air Hose

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 having to move the
compressor or stretch the hose. Never pull the
hose to move the compressor or put any unneces­sary stress on the hose, valves, fittings, or tank.

Fittings

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

You will need to determine the size of the fit­tings and whether they are male or female (see
Figure 14). 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.

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) on
Page 19 for more information. The higher CFM a
tool requires, the larger the inner diameter of the
hose will need to be (see Figure 13).

Airflow Delivery Required ID

0–3 CFM

3.1–5.9 CFM

6+ CFM

Figure 13. Recommended hose inner diameters.

1

⁄4" (3mm)

1

⁄4"–3⁄8" (3mm–10mm)

3

⁄8"+ (10mm+)

Male

Coupler

Figure 14. Example of male and female fittings.

The outlet ports on the T33858 are universal
quick-connect couplers with a coupling size of

1

⁄4" (see Figure 15). To connect a hose, the hose
must have an attached plug with the same cou­pling size and be one of the following styles:
industrial, automotive, ARO, V-style (also called
European), or Lincoln.

Male
Plug

Female

Coupler

Quick-Connect

Coupler

(1 of 2)

Female

Plug

-18-

Figure 15. Location of quick-connect coupler

ports.

Model T33858 (Mfd. Since 03/23)

Connecting Air Tool

There are various air tools that can be connected
to your air compressor by means of an air hose,
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.

2

Operating Pressure (Pounds/Inch

Your second consideration should be the recom­mended or required operating pressure of your
tool. 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 pressure can be adjusted to a
safe level.

The Model T33858 has a regulator and pressure
gauge for controlling and observing your line pres­sure, allowing for very little setup.

)

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 very simple outline.

Duty Cycle

The duty cycle of your compressor will also have
an effect on how efficient the airflow delivery is.
Refer to Figure 16 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 16. Common duty cycles.

Items Needed Qty

Air Tool (Rated for 90 PSI or Less) ................... 1

Air Hose
Compatible Plug w/
Additional Connection Fittings

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

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

1

⁄4" Coupling Size ............... 1

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

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

Model T33858 (Mfd. Since 03/23)

-19 -

To connect air tool:

Turn regulator knob (see Figure 17) all the

1.

way counterclockwise.

Regulator

Knob

Figure 17. Location of regulator knob.

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:

Turn regulator knob (see Figure 17) all the

1.

way counterclockwise.

2. Insert air hose plug into quick-connect cou­pler (see Figure 18).

Note: When plug is fully seated, quick-con-

nect coupler will automatically lock it in place.

Plug

Quick-Connect

Coupler

Figure 18. Example of inserting plug into

coupler.

Disconnect air tool from hose.

2.

3. While holding hose near plug, push coupler

sleeve toward compressor to release hose
plug (see Figure 19).

Note: Air will escape when connection is bro-

ken if tank is still pressurized.

Coupler

Sleeve

Plug

3.

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.

-20-

Figure 19. Example of pushing coupler sleeve to

release plug.

Model T33858 (Mfd. Since 03/23)

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.

H5527—18-Gauge Brad Nailer Kit

This 18-gauge nail gun accepts up to 100 5⁄8"–2"
brads, operates on 60–100 PSI, features a 360
degree adjustable exhaust, and only weighs 3.5
lbs. Includes a case.

H7664—Nailer/Stapler Kit

This nail gun/staple gun shoots
brads and
crown. Features a view window that tells you
when to reload, trigger mode, adjustable depth
stop, rubberized grip, and adjustable exhaust port.
Operating pressure of 60–100 PSI.

5

⁄8"–15⁄8" 18-gauge staples with 1⁄4"

5

⁄8"–2" 18-gauge

Figure 21. H5527 18-Gauge Brad Nailer Kit.

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

T32402

T32404

Figure 20. H7664 Nailer/Stapler Kit.

Model T33858 (Mfd. Since 03/23)

Figure 22. Assortment of basic eye protection.

-21-

SECTION 6: MAINTENANCE

Daily Maintenance

• Open drain valve to drain any condensation

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

(see Page 23).

• Test function of safety relief valve 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.

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

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.

Schedule

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

Weekly Maintenance

• Inspect tank for rust, damage, or wear.
Promptly replace a damaged tank.

• Check air filter (see Page 23).

• Clean/vacuum dust buildup off compressor.

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.

Semi-Annual Maintenance

• Check hoses/connections for leaks (see
Page 24). If soapy water at suspected leak
creates bubbles, air is escaping. Repair or
replace affected parts.

Ongoing

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

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

Worn or damaged wires, cords, and plugs.

•

Tank rust/corrosion.

•

Any other unsafe condition.

•

-22-

Lubrication

The Model T33858 is an oil-free air compres­sor, so no lubrication is necessary. Refer to the
instructions of any attached air tools to determine
if they require air line lubrication before they are
connected.

Model T33858 (Mfd. Since 03/23)

Draining Tank

Checking Air Filter

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

To drain tank:

DISCONNECT MACHINE FROM POWER!

1.

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

2. Use safety relief valve to reduce tank pres-

sure to less than 10 PSI.

Open drain valve (see Figure 23) to drain

3.

condensation from tank.

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

To check air filter:

1. 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 safety relief valve to reduce tank pres-

sure to less than 10 PSI.

While holding base of filter assembly in place,

3.

turn filter cap counterclockwise to remove
cap (see Figure 24).

Drain Valve

Handle

Figure 23. Drain valve handle open.

Model T33858 (Mfd. Since 03/23)

Cap

Figure 24. Air filter assembly components.

— 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.

Replace filter, then install cap (refer to part

4.

#77 in Parts beginning on Page 35).

Base

-23-

Checking for Leaks

Air leaks will cause low air output and increase
the time the compressor must run.

Fixing Leaks

Item Needed Qty

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

Thread Sealing Tape or Pipe Dope

To fix leaks:

... As Needed

Checking for Leaks

1. Disconnect tools and hoses from compressor.

Turn compressor ON and allow tank to fill

2.

until cut-out pressure is reached (150 PSI).

DISCONNECT MACHINE FROM POWER!

3.

4. 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.

— If you do hear air escaping, or pressure

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

Spray suspected air leak with soap and water

5.

solution and look for air bubbles.

— If bubbles do not form, repeat at different

location.

DISCONNECT MACHINE FROM POWER!

1.

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

2. Use safety relief valve to reduce tank pres-

sure to less than 10 PSI.

Open drain valve to relieve any remaining air.

3.

4. Remove fitting or valve that is leaking.

5. Clean threads, apply thread sealing tape or

pipe dope to threads, then re-install part.

Note: If a fitting or valve continues to leak

after preceding steps, replace part.

— If bubbles do form, proceed to Fixing

Leaks.

-24-

Model T33858 (Mfd. Since 03/23)

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 Test

Run beginning on Page 15.

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!

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

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

Open drain valve to drain any condensation

3.

from tank.

Disconnect air tool and hose from machine.

4.

5. Clean machine.

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.

Close drain valve.

6.

7. 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.

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

Model T33858 (Mfd. Since 03/23)

-25-

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.

Machine has
vibration or
noisy operation.

1. Tank already pressurized.

2. Incorrect power supply voltage or circuit size.

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

4. Power supply circuit breaker tripped or fuse
blown.

5. Tripped thermal overload in motor,
compressor is exceeding its duty cycle.

6. Start capacitor at fault.

7. Wiring broken, disconnected, or corroded.

8. Check valve components are dirty/damaged.

9. Pressure switch at fault.

10. Motor or motor bearings at fault.

1. Air filter dirty/clogged.

2. Pump/motor have restricted airflow.

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

4. Tripped thermal overload in motor,
compressor is exceeding its duty cycle.

5. Extension cord too long.

6. Check valve components are dirty/damaged.

7. Motor or motor bearings at fault.

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

1. Motor or component loose.

2. Machine feet loose.

3. Motor fan rubbing on fan cover.

4. Motor bearings at fault.

5. Compressor pump at fault.

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

2. Ensure correct power supply and circuit size
(Page 11).

3. Adjust settings (Page 31). Do not exceed cut-in/cut­out pressures listed on data sheet (Page 6) or inside
pressure switch.

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

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

6. Test/replace if at fault.

7. Fix broken wires or disconnected/corroded
connections.

8. Clean/replace check valve components (Page 29).

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

10. Replace motor.

1. Replace air filter (Page 23).

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

3. Adjust settings (Page 31). Do not exceed cut-in/cut­out pressures listed on data sheet (Page 6) or inside
pressure switch.

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

5. Move machine closer to power supply; use shorter
extension cord.

6. Clean/replace check valve components (Page 29).

7. Replace motor.

8. Rebuild/replace.

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

2. Tighten fasteners.

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

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

5. Compressor piston rod/bearings/crankshaft is worn.
Rebuild or replace pump.

-26-

Model T33858 (Mfd. Since 03/23)

Motor & Electrical (Cont.)

Symptom Possible Cause Possible Solution

Motor runs
continuously.

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

1. Machine is undersized.

2. Regulator needs to be adjusted for lower
airflow delivery.

3. Air leak in tank or delivery hose/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.

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

2. Turn regulator knob counterclockwise to decrease line
PSI.

3. Check air tank, hose/pipes, and all connections for
leaks (Page 24). 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 31). 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.

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

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

1. Check valve components are dirty/damaged.

2. Pressure switch at fault.

1. Drain valve is open.

2. Air filter dirty/clogged.

3. Regulator 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 hose/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. Drain valve is open.

2. Tank needs to be drained.

3. Air filter dirty/clogged.

4. Air leak in tank or delivery hose/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. Clean/replace check valve components (Page 29).

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

1. Close drain valve.

2. Replace air filter (Page 23).

3. Turn regulator knob counterclockwise to decrease line
PSI.

4. Adjust settings (Page 31). Do not exceed cut-in/cut­out pressures listed on data sheet (Page 6) or inside
pressure switch.

5. Check air tank, hose/pipes, and all connections for
leaks (Page 24). Do not attempt to repair leaking/
damaged tank, only replace.

6. Clean/replace check valve components (Page 29).

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. Close drain valve.

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

3. Replace air filter (Page 23).

4. Check air tank, hose/pipes, and all connections for
leaks (Page 24). Do not attempt to repair leaking/
damaged tank, only replace.

5. Clean/replace check valve components (Page 29).

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.

Model T33858 (Mfd. Since 03/23)

-27-

Operation (Cont.)

Symptom Possible Cause Possible Solution

Air leaks from
air filter.

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.

Safety relief
valve leaks.

Delivered air
is dirty or has
excessive
moisture.

Compressor
knocking.

1. Check valve components are dirty/damaged.

2. Reed valve(s) not sealing.

1. Tank needs to be drained.

2. Air filter dirty/clogged.

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

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

5. Compressor pump is at fault.

1. Tank needs to be drained.

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

3. Ambient environment has too much humidity.

1. Air hose is too long.

2. Regulator needs to be adjusted for higher
airflow delivery.

3. Machine is undersized.

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

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

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

7. Air leaks in hose.

8. Regulator 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. Tank needs to be drained.

2. In-line filter or water separator needed.

3. Delivery pipes are dirty (if used).

1. Air filter dirty/clogged.

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

3. Piston assembly loose.

1. Clean/replace check valve components (Page 29).

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

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

2. Replace air filter (Page 23).

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

4. Replace filter or in-line filter assembly.

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

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

2. Drain water separator.

3. Install in-line air dryer and water separator.

1. Use shorter hose.

2. Turn regulator knob clockwise to increase line PSI. DO
NOT exceed pressure rating of attached tool.

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

4. Replace filter or in-line filter assembly.

5. Drain water separator.

6. Adjust settings (Page 31). 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 24).

8. Inspect regulator for leaks. Replace if at fault.

9. Replace pressure gauge(s).

1. Adjust settings (Page 31). 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. Open drain valve to drain condensation, then close.

2. Install in-line air filter and water separator.

3. Remove delivery pipes, clean out and replace.

1. Replace air filter (Page 23).

2. Take compressor to authorized service center.

3. Inspect and repair piston and connecting rod.

-28-

Model T33858 (Mfd. Since 03/23)

Inspecting

Check Valve

The check valve directs compressed air into the
tank and prevents it from flowing back toward
the pump. The diaphragm in the check valve can
become damaged, twisted, or dirty and cause
the valve to leak or prevent the compressor from
pressurizing.

Tools Needed Qty

Hex Wrench 4mm .............................................. 1

Phillips Head Screwdriver #2 (6"+ Shaft)
Wrench or Socket 19mm

To inspect check valve:

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

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

.......... 1

Drain Valve

Handle

Figure 25. Drain valve handle open.

4. Turn filter assembly base counterclockwise

to remove filter assembly (see Figure 26).

Remove (4) cap screws shown in Figure 26.

5.

Filter

Assembly

Base

DISCONNECT MACHINE FROM POWER!

1.

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

2. Use safety relief valve to reduce tank pres-

sure to less than 10 PSI.

Open drain valve to release any remaining air

3.

(see Figure 25).

x 4

Figure 26. Location of filter assembly base and

shroud cap screws.

Model T33858 (Mfd. Since 03/23)

-29-

Remove (6) tap screws at locations shown in

6.
Figure 27 to remove motor/pump shroud.

8. Inspect seal ring and diaphragm (see Figure

29) for damage and dirt.

Diaphragm

Seal Ring

Figure 27. Locations of shroud tap screws.

7. Remove cap, shown in Figure 28, from

check valve.

Check Valve

Cap

Figure 28. Location of check valve cap (control

panel removed for clarity).

Figure 29. Check valve components.

9. Replace any damaged parts and clean any

dirt from diaphragm and seal ring.

Re-install check valve cap.

10.

IMPORTANT: Make sure diaphragm presses

squarely against discharge line and exhaust
tube opening.

Note: Do not add thread sealant or thread

sealing tape to cap threads. Seal ring pro­vides sufficient sealing.

Install motor/pump shroud with screws

11.

removed in Steps 5–6.

Install filter assembly.

12.

13. Close drain valve.

-30-

Model T33858 (Mfd. Since 03/23)

Adjusting Cut-In/

Cut-Out Settings

The pressure switch ensures the compressor will
turn ON when the tank pressure drops to approxi­mately 120 PSI (the cut-in pressure), and will turn
OFF when the tank pressure reaches 150 PSI (the
cut-out pressure). Should the pressure switch fail
to turn OFF the machine, the safety relief valve
will open shortly after the pressure exceeds 150
PSI and prevent over-pressurization.

Tools Needed Qty

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

Flat Head Screwdriver

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.

1

⁄4" .................................. 1

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.

Loosen Phillips head screws shown in

4.
Figure 30 to remove pressure switch cover.

x 2

Pressure

Switch

Cover

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

Adjusting Cut-In/Cut-Out Differential

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

To adjust cut-in/cut-out settings:

Operate compressor and record cut-in and

1.

cut-out pressures.

DISCONNECT MACHINE FROM POWER!

2.

Figure 30. Location of pressure switch cover and

Phillips head screws.

5. Adjust screw shown in Figure 31 to change
minimum and maximum tank pressure
settings.

Cut-In/

Cut-Out

Adjustment

Screw

Figure 31. Location of cut-in/cut-out adjustment

screw.

Model T33858 (Mfd. Since 03/23)

-31-

— Turn screw half turn clockwise to increase

both settings.

— Turn screw half turn counterclockwise to

decrease both settings.

Install pressure switch cover.

6.

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 150 PSI, turn
machine OFF before pressure reaches 155
PSI. Adjust pressure switch settings until cut­out pressure is 150 PSI or lower.

Adjusting Only Cut-Out Setting

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 cut-out pressure
must be kept between 30–40 PSI. Exceeding this
range can cause the compressor to overheat.

x 2

Figure 32. Location of pressure switch cover

and Phillips head screws.

Adjust screw shown in Figure 33 to change

5.

maximum tank pressure setting.

Pressure

Switch

Cover

To adjust only cut-out setting:

Operate compressor and record cut-in and

1.

cut-out pressures.

DISCONNECT MACHINE FROM POWER!

2.

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.

Loosen Phillips head screws shown in

4.
Figure 32 to remove pressure switch cover.

Cut-Out

Adjustment

Screw

Figure 33. Location of 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.

6.

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 150 PSI, turn
machine OFF before pressure reaches 155
PSI. Adjust pressure switch settings until cut­out pressure is 150 PSI or lower.

-32-

Model T33858 (Mfd. Since 03/23)

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
[phone] 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 [phone].

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

Model T33858 (Mfd. Since 03/23)

-33-

120 VAC

Wiring Diagram

MOTOR 120V

START

CAPACITOR

CBB65 110uF 250V

PRESSURE

SWITCH

LEFOO LF19-1H

GND

Neutral

5-15 Plug

Hot

Ground

-34-

Figure 34. Pressure switch wiring. Figure 35. Start capacitor wiring.

READ ELECTRICAL SAFETY

ON PAGE 33!

Model T33858 (Mfd. Since 03/23)

SECTION 9: PARTS

To order parts, contact MEGA by phone at [phone] or email at [e-mail].

Main

75

18

19

17

16

76

50

21

14

23

25

15

20

24

26

1

27

59

2

4

29

22

3

28

5

8

30

31

6

7

10

9

12

60

34

11

32

33

61

36

35

13

65

37

38

62

39

42

40

41

49

48

47

46

45

44

43

63

64

66

67

68

51

52

53

54

55

56

57

Model T33858 (Mfd. Since 03/23)

70

69

71

72

73

74

58

-35-

REF DE S CRIPTI ON

QTY

REF DE S CRIPTI ON

QTY

1 CAP SCREW M6-1 X 25 8 39 HEX BOLT M5-.8 X 160 4
2 LOCK WASHER 6MM 8 40 STRAIN RELIEF TYPE-1 5/8" 2
3 CYLI NDE R HEAD 1 41 LOCK WASHER 5MM 4
4 CYLINDER HEAD GASKET 2 42 CRANKCASE RI GHT 1
5 SLOW START VALVE G 1/4" 13-14 PSI 1 43 INT TOOTH WAS HER 5MM 1
6 TAP SCREW M4 X 10 2 44 PHLP HD SCR M5-.8 X 10 1
7 LOCK WASHER 4MM 2 45 FAN RIGHT 1
8 VALVE STOP ALUMINUM 2 46 CAP SCREW M5-.8 X 10 6
9 VALVE REED 4 47 CORD CLEAT 1
10 VALVE PLATE 2 48 TAP SCREW M4.2 X 18 7
11 VALVE COMPRESSION BACKER 2 49 SHROUD RI GHT 1
12 PHLP HD SCR M4-.7 X 6 2 50 ELBOW FITTING 45-DEG 1/4" PT X M14-1.5 1
13 O-RING 66 X 2.6 2 51 BRAIDED DISCHARGE TUBE M14-1.5 X 170 1
14 O-RING 9.5 X 2 4 52 CHECK VALVE G 3/8" X M10-1 X M14-1.5 1
15 CONNECTI NG TUBE 2 53 TANK 1
16 CYLI NDER HEAD 1 54 FLANGE NUT M6 -1 3
17 AI R FILTER ASSEMBLY 1 55 FOOT PAD 3
18 FILTER TUBE 10 X 7MM NYLON 1 56 FE NDER WAS HER 6MM 3
19 S HROUD LE FT 1 57 FLANGE BOLT M6-1 X 25 3
20 FLAT HD CAP SCR M6-1 X 16 2 58 BALL DRAIN VALVE 1/4" PT 1
21 PI STON CAP 2 59 DISCHARGE PIPE 6MM 1
22 PI STON RING 68 X 48 X 1MM 2 60 L OCK NUT M8 -1 1
23 CY LI NDER 2 61 S CAPACITOR 125M 250V M8-1 X 10 1
24 CO NNECTI NG ROD 2 62 SAFETY RELIEF VALVE 1/4" PT 170 PSI 1
25 PHLP HD SCR M4-.7 X 8 6 63 PRESSURE SWITCH LEFOO LF19-1H 1
26 FA N HOUSI NG 2 64 PIPE NIPPLE 1/4" PT X 1-1/16" 1
27 E XT RETA I NI NG RI NG 14 MM 2 65 CONTROL PANEL 1
28 FA N LEFT 1 66 PRESSURE GAUGE 1/4" PT 2
29 E CCENTRI C 2 67 COUPLER UNIVERSAL 1/4" NPT 1/4" BODY 2
30 SET SCREW M8-1.25 X 10 4 68 REGULATOR 1
31 BALL BEARING 6006-2RS 2 69 REGULATOR KNOB 1
32 FL ANGE NUT M6-1 4 70 PIPE FITTING PLUG 1/4" PT 2
33 VI BRATION DAMPER 4 71 PIPE NIPPLE 1/4" PT 1
34 FL ANGE NUT M5-. 8 4 72 P I P E FI TTI NG NUT G 3/ 8" 1
35 CRANKCASE LEFT 1 73 GASKET 7.5 X 14. 5 X 1.5MM PAPER 2
36 BALL BEARING 6203-2RS 2 74 POWER CORD 14G 3W 72" 5-15P 1
37 STATOR 1 75 FI LTE R 2
38 RO TOR 1 76 PI PE FITTING G 1/4" 1

Main Parts List

-36-

Model T33858 (Mfd. Since 03/23)

101

108

REF PART # DES CRIPTIO N REF PART # DESCRI P TION

TANK

PRESSURE

Labels & Cosmetics

102

103

REGULATOR

PRESSURE

104

Motor: 1-1/2 HP, 120V, 1-Ph, 60 Hz
Full-Load Current Rating: 12A
Type/Size: One-Stage, 6 Gallons
Max. Airflow @ 40 PSI: 4.5 CFM
Max. Airflow @ 90 PSI: 3.5 CFM
Cut-Out Pressure: 150 PSI
Cut-In Pressure: 120 PSI
Max. Pressure: 150 PSI
Duty Cycle: 60/40
Connection Size: 1/4" NPT

Specifications

Weight: 52 lbs.

To reduce 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. Only plug power cord into a grounded outlet.

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. Always disconnect power and drain air tank before moving or servicing.
DO NOT pull compressor by power cord or air hose.

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

8. Only operate in well-ventilated area free of combustibles. 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.

11. DO NOT use if cord, plug, or any other electrical equipment becomes
damaged—promptly repair!

12. DO NOT stand on compressor or obstruct airflow to ventilation openings.

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

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

15. Inspect compressor, valves, and tank for damage, leaks, weakness, or
excessive wear. Repair/replace defective items before operating.

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

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

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

19. Prevent unauthorized use by children or untrained users.

WARNING!

Date

S/N

107

106

DRAIN TANK

AFTER

EVERY USE!

T33858

Mfd. for Grizzly in China

105

101 PT33858101 MACHINE ID LABEL 105 PT33858105 GRIZZLY PRO LABEL
102 PT33858102 ELECTRICITY LABEL 106 PT33858106 QR CODE LABEL
103 PT33858103 REGULATOR PRESSURE LABEL 107 PT33858107 TOUCH-UP PA I NT, GRI ZZLY G REEN
104 PT33858104 DRAIN TANK LABEL 108 PT33858108 TANK PRESSURE 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 [phone] or www.grizzly.com.

Model T33858 (Mfd. Since 03/23)

-37-