Grizzly G0731 User manual

COPYRIGHT © DECEMBER, 2011 BY GRIZZLY INDUSTRIAL, INC., REVISED JUNE, 2022 (BL)
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#KN14570 PRINTED IN TAIWAN V2.06.22
MODEL G0731
8" X 30" VERTICAL MILL
w/POWER FEED
OWNER'S MANUAL
(For models manufactured since 01/17)
***Keep for Future Reference***

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 compre-
hension, 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 equip-
ment, such as those dust masks that are specially designed to filter
out microscopic particles.

Table of Contents
INTRODUCTION............................................... 2
Contact Info.................................................... 2
Manual Accuracy ........................................... 2
Identification ................................................... 3
Controls & Components ................................. 4
Machine Data Sheet ...................................... 7
SECTION 1: SAFETY....................................... 9
Safety Instructions for Machinery .................. 9
Additional Safety for Milling Machines ......... 11
SECTION 2: POWER SUPPLY ...................... 12
SECTION 3: SETUP ....................................... 15
Needed for Setup ......................................... 15
Unpacking .................................................... 15
Inventory ...................................................... 16
Cleanup ........................................................ 16
Site Considerations ...................................... 17
Lifting & Placing ........................................... 18
Anchoring to Floor ....................................... 19
Assembly ..................................................... 19
Initial Lubrication .......................................... 20
Test Run ...................................................... 21
Spindle Break-In .......................................... 23
Inspections & Adjustments .......................... 23
SECTION 4: OPERATIONS ........................... 24
Operation Overview ..................................... 24
Table Movement .......................................... 25
Positioning Headstock ................................. 27
Setting Spindle Speed ................................. 29
Spindle Downfeed ........................................ 30
Loading/Unloading Tooling .......................... 31
SECTION 5: ACCESSORIES......................... 32
SECTION 6: MAINTENANCE......................... 33
Schedule ...................................................... 33
Cleaning & Protecting .................................. 33
Lubrication ................................................... 33
Tensioning/Replacing V-Belts ...................... 35
Machine Storage .......................................... 36
SECTION 7: SERVICE ................................... 37
Troubleshooting ........................................... 37
Adjusting Gibs .............................................. 39
Adjusting Backlash....................................... 40
Tramming Spindle ........................................ 41
SECTION 8: WIRING...................................... 43
Wiring Safety Instructions ............................ 43
Wiring Diagram ............................................ 44
SECTION 9: PARTS....................................... 45
Head ............................................................ 45
Drive System................................................ 47
Table & Saddle ............................................ 48
Knee & Base ................................................ 49
Labels & Cosmetics ..................................... 51
WARRANTY & RETURNS ............................. 53

-2- Model G0731 (Mfd. Since 01/17)
We stand behind our machines! If you have ques-
tions or need help, contact us with the information
below. Before contacting, make sure you get the
serial number
and manufacture date
from the
machine ID label. This will help us help you faster.
Grizzly Technical Support
1815 W. Battlefield
Springfield, MO 65807
Phone: [phone]
Email: [email protected]
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: [email protected]
Contact Info
We are proud to provide a high-quality owner’s
manual with your new machine!
We
made every effort to be exact with the
instruc-
tions, specifications, drawings, and photographs
in this manual. Sometimes we make mistakes, but
our policy of continuous improvement also means
that
sometimes the machine
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
e post
current
manuals and
manual updates for free
on our web-
site at
www.grizzly.com.
Alternatively, you can call our Technical Support
for help. Before calling, make sure you write
down the
manufacture date and
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.
Manufacture Date
Serial Number
Manual Accuracy
INTRODUCTION
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 per-
sonal injury, damage to equipment, or poor
work results.

Model G0731 (Mfd. Since 01/17) -3-
Front View
Rear View
V-Belt Cover
X-Axis Limit Stop Track
Cross Feed Handwheel
Motor 1
1⁄2 H P
110V/220V, Single
Phase
Knee
Y-Axis Feed Limit Stop
Track
ON/OFF Spindle Direction Switch
X-Axis Power Feed
V-Belt Tension Adjustment Bolt
Coarse Downfeed
Handle
Downfeed Selector
Turret
Z-Axis Crank Handle
One-Shot Oiler
Base
Splash
Pan
Column
Spindle Bearing Oil Cup
X-Axis Crank Handwheel
Fine Downfeed Handwheel
Identification
Become familiar with the names and locations of the controls and features shown below to better understand
the instructions in this manual.

-4- Model G0731 (Mfd. Since 01/17)
Controls &
Components
A. Quill Dog: Moves with the quill. Use the
pointer on the side with the downfeed scale
to determine the depth of downfeed travel.
B. Downfeed Scale: Displays the amount of
quill travel in inches.
C. Coarse Downfeed Handle: When this lever
is enabled with the downfeed selector, it
raises/lowers the quill quickly.
D. Quill Lock Lever: Locks the quill in place but
does not affect spindle rotation.
E. Downfeed Stop & Lock Wheels: Stops the
downfeed travel when the quill dog reaches
this point. Set the stop wheel along the
downfeed scale for the desired depth of cut,
then secure it in place by tightening the lock
wheel.
F. Graduated Dial (Fine Downfeed): Displays
quill travel in 0.001" increments when the fine
downfeed handwheel is used. One full revo-
lution represents 0.100" of quill travel.
G. Fine Downfeed Handwheel: When enabled,
it raises/lowers the quill in small increments.
H. Downfeed Selector: Enables either the
coarse or fine downfeed control. Tighten
the selector to enable the fine downfeed
handwheel, and loosen it to enable the
coarse downfeed lever.
Refer to Figures 1–2 and the following descrip-
tions 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 stay safe
when operating this machine.
To reduce your risk of
serious injury, read this
entire manual BEFORE
using machine.
Downfeed Controls
Figure 1. Downfeed controls viewed from the
right side.
A
B
C
D
E
Figure 2. Downfeed controls viewed from the left
side.
G
H
F

Model G0731 (Mfd. Since 01/17) -5-
Table Controls
Figure 4. Knee and cross slide locks, and one-
shot oiler.
O
QP
L. Y-Axis Handwheel: Manually moves table
along Y-axis (front and back).
M. Knee Crank: Manually moves table along
Z-axis (up and down).
N. Graduated Dial (X-Axis): Displays X-axis
table movement in 0.001" increments. One
full revolution represents 0.100" of table
travel.
O. One-Shot Oiler: Lubricates table ways.
P. Y-Axis Lock: Tightens to prevent Y-axis
table movement for increased rigidity during
operations when the Y-axis should not move.
Q. Z-Axis Lock: Tightens to prevent Z-axis
table movement for increased rigidity during
operations when the Z-axis should not move.
Figure 3. Table control handwheels and X-axis
locks.
J
I
M
LK
N
I. X-Axis Handwheel (1 of 2): Manually moves
table along X-axis (left and right).
J. X-Axis Locks: Tighten to prevent X-axis
table movement for increased rigidity during
operations when the X-axis should not move.
K. Graduated Dial (Y-Axis): Displays Y-axis
table movement in 0.001" increments. One
full revolution represents 0.100" of table
travel.
Spindle Direction Switch
Figure 5. Location of spindle direction switch.
R. Spindle Direction Switch: Turns motor ON
in Forward (FWD) or Reverse (REV) direc-
tion. Turns motor OFF in OFF position.
R

-6- Model G0731 (Mfd. Since 01/17)
X-Axis Power Feed Controls
Model G0731 is equipped with a power feed unit
for X-axis table movement. Refer to Figure 6 and
the following descriptions to understand the func-
tions of the various components of the power feed
system.
S. Power Feed Limit Switch: Stops table
movement when either of the switch side
plungers are pressed by limit stops.
T. Limit Stop (1 of 2): Restricts table move-
ment by its positioning along front of table.
U. Graduated Dial (X-Axis): Displays distance
of X-axis table travel in 0.001" increments.
One full revolution equal to 0.100" of table
travel.
V. Rapid Traverse Button: When pressed,
moves table at full speed when already in
motion.
W. Direction Lever: Selects direction of table
movement. Middle position is neutral.
X. Speed Dial: Controls speed of table move-
ment. Turning dial clockwise causes table to
move faster.
Note: Feed rates for table travel are extreme-
ly difficult to precisely calculate. We recom-
mend that you combine research and experi-
mentation to find feed rates that best work for
your operations.
Y. ON/OFF Switch: Turns power feed ON and
OFF.
Z. Circuit Breaker Reset Button: Resets inter-
nal circuit breaker if unit is overloaded and
shuts down.
Figure 6. Power feed controls.
U
V
W
ZX
Y
ST

Model G0731 (Mfd. Since 01/17) -7-
Machine Data Sheet
data sheet
The information contained herein is deemed accurate as of 6/2/2022 and represents our most recent product specifications.
Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased. PAGE 1 OF 2
Model G0731
MACHINE DATA
SHEET
Customer Service #: [phone] · To Order Call: [phone] · Fax #: [phone]
MODEL G0731 8" X 30" 1‐1/2 HP VERTICAL MILL WITH
POWER FEED
Product Dimensions:
Weight.............................................................................................................................................................. 935 lbs.
Width (side-to-side) x Depth (front-to-back) x Height.............................................................. 40-1/2 x 42-3/4 x 67 in.
Footprint (Length x Width)............................................................................................................................ 19 x 36 in.
Space Required for Full Range of Movement (Width x Depth).................................................................... 68 x 48 in.
Shipping Dimensions:
Type.......................................................................................................................................................... Wood Crate
Content........................................................................................................................................................... Machine
Weight.............................................................................................................................................................. 954 lbs.
Length x Width x Height....................................................................................................................... 44 x 44 x 76 in.
Electrical:
Power Requirement............................................................................................. 110V or 220V, Single-Phase, 60 Hz
Prewired Voltage.................................................................................................................................................. 110V
Full-Load Current Rating....................................................................................................... 18A at 110V, 9A at 220V
Minimum Circuit Size.......................................................................................................... 20A at 110V, 15A at 220V
Connection Type....................................................................................................................................... Cord & Plug
Power Cord Included.............................................................................................................................................. Yes
Power Cord Length................................................................................................................................................. 6 ft.
Power Cord Gauge......................................................................................................................................... 14 AWG
Plug Included.......................................................................................................................................................... Yes
Included Plug Type................................................................................................................................. 5-15 for 110V
Recommended Plug Type...................................................................................................................... 6-15 for 220V
Switch Type........................................................................................................................... Forward/Reverse Switch
Motors:
Main
Horsepower............................................................................................................................................. 1.5 HP
Phase............................................................................................................................................ Single-Phase
Amps....................................................................................................................................................... 18A/9A
Speed................................................................................................................................................ 1725 RPM
Type................................................................................................................. TEFC Capacitor-Start Induction
Power Transfer ............................................................................................................................... V-Belt Drive
Bearings..................................................................................................... Shielded & Permanently Lubricated
Centrifugal Switch/Contacts Type......................................................................................................... External
MODEL G0731
8" X 30"VERTICAL MILL WITH POWER FEED

-8- Model G0731 (Mfd. Since 01/17)
The information contained herein is deemed accurate as of 6/2/2022 and represents our most recent product specifications.
Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased. PAGE 2 OF 2
Model G0731
Main Specifications:
Operation Info
Spindle Travel........................................................................................................................................ 3-1/2 in.
Max Distance Spindle to Column................................................................................................................. 7 in.
Max Distance Spindle to Table.................................................................................................................. 20 in.
Longitudinal Table Travel (X-Axis)............................................................................................................. 18 in.
Cross Table Travel (Y-Axis).................................................................................................................. 7-3/4 in.
Vertical Table Travel (Z-Axis).............................................................................................................. 17-3/4 in.
Turret or Column Swivel (Left /Right)................................................................................................... 360 deg.
Head Tilt (Left/Right).............................................................................................................................. 45 deg.
Drilling Capacity for Cast Iron...................................................................................................................... 1 in.
Drilling Capacity for Steel......................................................................................................................... 3/4 in.
End Milling Capacity.................................................................................................................................... 1 in.
Face Milling Capacity................................................................................................................................... 3 in.
Table Info
Table Length.............................................................................................................................................. 30 in.
Table Width.................................................................................................................................................. 8 in.
Table Thickness........................................................................................................................................... 2 in.
Number of T-Slots............................................................................................................................................ 3
T-Slot Size................................................................................................................................................ 1/2 in.
T-Slots Centers.................................................................................................................................... 2-3/16 in.
Spindle Info
Spindle Taper............................................................................................................................................... R-8
Number of Vertical Spindle Speeds.................................................................................................................. 9
Range of Vertical Spindle Speeds........................................................................................... 270 – 3200 RPM
Quill Diameter....................................................................................................................................... 2.950 in.
Drawbar Thread Size............................................................................................................................. 7/16-20
Drawbar Length................................................................................................................................... 12-3/8 in.
Spindle Bearings....................................................................................................... Angular Contact Bearings
Construction
Spindle Housing/Quill....................................................................... Chrome-Plated & Precision-Ground Steel
Table....................................................................................................................... Precision-Ground Cast Iron
Head.................................................................................................................................................... Cast Iron
Column/Base....................................................................................................................................... Cast Iron
Base..................................................................................................................................................... Cast Iron
Stand.................................................................................................................................................... Cast Iron
Paint Type/Finish.................................................................................................................................... Enamel
Other Specifications:
Country of Origin .............................................................................................................................................. Taiwan
Warranty ........................................................................................................................................................... 1 Year
Approximate Assembly & Setup Time .............................................................................................................. 1 Hour
Serial Number Location .................................................................................................................................. ID Label

Model G0731 (Mfd. Since 01/17) -9-
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.
Always discon-
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.
OWNER’S MANUAL. Read and understand this
owner’s manual BEFORE using machine.
TRAINED OPERATORS ONLY. Untrained oper-
ators have a higher risk of being hurt or killed.
Only allow trained/supervised people to use this
machine. When machine is not being used, dis-
connect power, remove switch keys, or lock-out
machine to prevent unauthorized use—especially
around children. Make 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 machin-
ery. Never operate under the influence of drugs or
alcohol, when tired, or when distracted.
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 impor-
tance 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 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.
Indicates a potentially hazardous situation which, if not avoided,
COULD result in death or serious injury.
Indicates an imminently hazardous situation which, if not avoided,
WILL result in death or serious injury.
This symbol is used to alert the user to useful information about
proper operation of the machine.
NOTICE
Safety Instructions for Machinery
SECTION 1: SAFETY

-10- Model G0731 (Mfd. Since 01/17)

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avoid
accidentalslips,whichcouldcauselossofwork-
piececontrol.
hAzARdOus dusT. Dust created while using
machinery may cause cancer, birth defects, or
long-term respiratory damage. Be aware of dust
hazardsassociatedwitheachworkpiecematerial,
andalwayswearaNIOSH-approvedrespiratorto
reduceyourrisk.
hEARING PROTECTION.Alwayswearhear-
ing 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!
INTENdEd usAGE. Only use machine for its
intendedpurposeandnevermakemodifications
not approved by Grizzly. Modifying machine or
using it differently than intended may result in
malfunctionormechanicalfailurethatcanleadto
serious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.
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dur-
ing 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rec-
ommended accessories. Using improper acces-
sories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 WIThCARE.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.
ChECK dAMAGEd PARTs. Regularly inspect
machine for any condition that may affect safe
operation.Immediatelyrepairorreplacedamaged
ormis-adjustedpartsbeforeoperatingmachine.
MAINTAIN POWER CORds. When disconnect-
ing 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intend-
edoperation,stopusingthemachine!Contactour
TechnicalSupportat(570)546-9663.

Model G0731 (Mfd. Since 01/17) -11-
Like all machinery there is potential danger when operating this machine. Accidents are fre-
quently 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.
Additional Safety for Milling Machines
UNDERSTAND ALL CONTROLS. Make sure
you understand the function and proper use of all
controls before starting. This will help you avoid
making mistakes that result in serious injury.
AVOIDING ENTANGLEMENT. DO NOT wear
loose clothing, gloves, or jewelry, and tie back
long hair. Keep all guards in place and secure.
Always allow spindle to stop on its own. DO NOT
stop spindle using your hand or any other object.
WEAR FACE SHIELD. Always wear a face shield
in addition to safety glasses. This provides more
complete protection for your face than safety
glasses alone.
USE CORRECT SPINDLE SPEED. Follow rec-
ommended speeds and feeds for each size and
type of cutting tool. This helps avoid tool breakage
during operation and ensures best cutting results.
INSPECT CUTTING TOOL. Inspect cutting tools
for sharpness, chips, or cracks before each use.
Replace dull, chipped, or cracked cutting tools
immediately.
PROPERLY SECURE CUTTER. Firmly secure
cutting tool or drill bit so it does not fly out of spin-
dle during operation.
POWER DISRUPTION. In the event of a local
power outage during operation, turn spindle
switch OFF to avoid a possible sudden startup
once power is restored.
You can be seriously injured or killed by getting clothing, jewelry, or long hair entangled with
rotating cutter/spindle. You can be severely cut or have fingers amputated from contact with
rotating cutters. You can be blinded or struck by broken cutting tools, metal chips, workpieces,
or adjustment tools thrown from the rotating spindle with great force. To reduce your risk of
serious injury when operating this machine, completely heed and understand the following:
CLEAN MACHINE SAFELY. Metal chips or shav-
ings can be razor sharp. DO NOT clear chips
by hand or compressed air that can force chips
farther into machine—use a brush or vacuum
instead. Never clear chips while spindle is turning.
SECURE WORKPIECE TO TABLE. Clamp work-
piece to table or secure in a vise mounted to table,
so workpiece cannot unexpectedly shift or spin
during operation. NEVER hold workpiece by hand
during operation.
PROPERLY MAINTAIN MACHINE. Keep
machine in proper working condition to help
ensure that it functions safely and all guards and
other components work as intended. Perform rou-
tine inspections and all necessary maintenance.
Never operate machine with damaged or worn
parts that can break or result in unexpected move-
ment during operation.
DISCONNECT POWER FIRST. To reduce risk of
electrocution or injury from unexpected startup,
make sure mill/drill is turned OFF, disconnected
from power, and all moving parts have come to
a complete stop before changing cutting tools or
starting any inspection, adjustment, or mainte-
nance procedure.
REMOVE CHUCK KEY & SPINDLE TOOLS.
Always remove chuck key, drawbar wrench, and
other tools used on the spindle immediately after
use. This will prevent them from being thrown by
the spindle upon startup.

-12- Model G0731 (Mfd. Since 01/17)
SECTION 2: POWER SUPPLY
Availability
Before installing the machine, consider the avail-
ability 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 electrican or
qualified service personnel in accordance with all
applicable codes and standards.
Electrocution, fire, or
equipment damage may
occur if machine is not
correctly grounded and
connected to the power
supply.
Full-Load Current Rating
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.
Full-Load Current Rating at 110V...... 18 Amps
Full-Load Current Rating at 220V ....... 9 Amps
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 over-
loading the machine during operation and make
sure it is connected to a power supply circuit that
meets the requirements in the following section.
For your own safety and protection of
property, consult an electrician if you are
unsure about wiring practices or electrical
codes in your area.
Note: The circuit requirements listed in this man-
ual apply to a dedicated circuit—where only one
machine will be running at a time. If this machine
will be connected to a shared circuit where mul-
tiple machines will be running at the same time,
consult a qualified electrician to ensure that the
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 sup-
ply 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.)
Circuit Information
This machine is prewired to operate on a 110V
power supply circuit that has a verified ground and
meets the following requirements:
Circuit Requirements for 110V
Nominal Voltage .................... 110V, 115V, 120V
Cycle ..........................................................60 Hz
Phase ........................................... Single-Phase
Power Supply Circuit ......................... 20 Amps
Plug/Receptacle ............................. NEMA 5-15
Circuit Requirements for 220V
Nominal Voltage ......... 208V, 220V, 230V, 240V
Cycle ..........................................................60 Hz
Phase ........................................... Single-Phase
Power Supply Circuit ......................... 15 Amps
Plug/Receptacle ............................. NEMA 6-15
This machine 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.)

Model G0731 (Mfd. Since 01/17) -13-
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 nec-
essary, do not connect the equipment-grounding
wire to a live (current carrying) terminal.
Check with a qualified electrician or service per-
sonnel 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, discon-
nect it from power, and immediately replace it with
a new one.
Extension Cords
We do not recommend using an extension cord
with this machine.
If you must use an extension
cord, only use it if absolutely necessary and only
on a temporary basis.
Extension cords cause voltage drop, which may
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
contain a ground wire, match the required plug
and receptacle, and meet the following require-
ments:
Minimum Gauge Size ...........................14 AWG
Maximum Length (Shorter is Better).......50 ft.
Grounding Requirements
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.
Figure 7. Typical 5-15 plug and receptacle.
Grounding Pin
Neutral Hot
5-15 PLUG
GROUNDED
5-15 RECEPTACLE
Figure 8. Typical 6-15 plug and receptacle.
Grounding Pin
Current Carrying Prongs
6-15 PLUG
GROUNDED
6-15 RECEPTACLE
For 110V operation: This machine is equipped
with a power cord that has an equipment-ground
-
ing wire and a grounding plug (see following fig
-
ure). The plug must only be inserted into a match
-
ing receptacle (outlet) that is properly installed
and grounded in accordance with all local codes
and ordinances.
For 220V operation: The plug specified under
“
Circuit Requirements for 220V” on the previous
page has a grounding prong that must be attached
to the equipment-grounding wire on the included
power cord. The plug must only be inserted into
a matching receptacle (see following figure) that
is properly installed and grounded in accordance
with all local codes and ordinances.
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
it will not fit the outlet, have a qualified
electrician install the proper outlet with a
verified ground.

-14- Model G0731 (Mfd. Since 01/17)
Ground
3
1
4
2
6
Motor Rewired for 220V
Motor Prewired for 110V
6
Ground
4
32
5
1
5
Figure 9. Motor configured for 110V operation.
To convert this mill for 220V power, you must re-
wire the motor and install a NEMA 6-15 plug and
receptacle.
Refer to Page 44 for the full Wiring Diagram.
You MUST disconnect the
mill from the power source
before beginning any of
the following 220V conver-
sion procedures to avoid
serious personal injury or
death by electrocution.
To rewire the motor:
1. Remove the cover of the motor wiring junc-
tion box.
2. Re-configure the motor wiring by removing
wires 1, 2, 3, 4, 5, and 6 from the terminal
block (see Figure 9).
3. Replace wires 4, 1, and 6 on the terminal
block, as shown in Figure 10.
4. Use the wire nut to secure wires 2, 3, and 5
together, as shown in Figure 10.
5. Replace the cover of the motor wiring junc-
tion box.
Replacing the Plug
Replace the molded NEMA 5-15 plug with a
NEMA 6-15 by removing the original and install-
ing the new plug according to the manufacturer's
instructions.
Tools/Items Needed Qty
Phillips Head Screwdriver #2 ............................ 1
Wire Nut ............................................................ 1
Ground
3
1
4
2
6
Motor Rewired for 220V
Motor Prewired for 110V
6
Ground
4
32
5
1
5
Figure 10. Motor configured for 220V operation.
Covers, guards, and safety devices on
this machine are provided for your safety.
Always keep them secured in place before
connecting the machine to power to avoid
serious personal injury.
Voltage Conversion

Model G0731 (Mfd. Since 01/17) -15-
SECTION 3: SETUP
Description Qty
• Additional Person ....................................... 1
• Safety Glasses (for each person) ............... 1
• Disposable Rags ........................ As Needed
• Cleaner/Degreaser ..................... As Needed
• Disposable Gloves ..................... As Needed
• Precision Level ........................................... 1
• Lifting Straps
(rated for at least 1500 lbs.) ........................ 2
• Power Lifting Equipment
(rated for at least 1500 lbs.) ........................ 1
• Mounting Hardware .................... As Needed
• External Retaining Ring Pliers ............1 Pair
• Wrench 1⁄2", 24mm ................................1 Ea.
• Hex Wrench 3mm ....................................... 1
• ISO 68 Oil Or Equivalent ..................5 Drops
Needed for Setup
This machine presents
serious injury hazards
to untrained users. Read
through this entire manu-
al to become familiar with
the controls and opera-
tions before starting the
machine!
Wear safety glasses during
the entire setup process!
HEAVY LIFT!
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.
This machine was carefully packaged for safe
transport. When unpacking, separate all enclosed
items from packaging materials and inspect them
for shipping damage.
If items are damaged
,
please
call us immediately at [phone].
IMPORTANT:
Save all packaging materials until
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
The following items are needed, but not included,
for the setup/assembly of this machine.

-16 - Model G0731 (Mfd. Since 01/17)
Cleanup
The unpainted surfaces of your machine are
coated with a heavy-duty rust preventative that
prevents corrosion during shipment and storage.
This rust preventative works extremely well, but it
will take a little time to clean.
Be patient and do a thorough job cleaning your
machine. The time you spend doing this now will
give you a better appreciation for the proper care
of your machine's unpainted surfaces.
There are many ways to remove this rust preven-
tative, but the following steps work well in a wide
variety of situations. Always follow the manufac-
turer’s instructions with any cleaning product you
use and make sure you work in a well-ventilated
area to minimize exposure to toxic fumes.
Before cleaning, gather the following:
•
Disposable Rags
•
Cleaner/degreaser (WD•40 works well)
•
Safety glasses & disposable gloves
•
Plastic paint scraper (optional)
Basic steps for removing rust preventative:
1.
Put on safety glasses.
2.
Coat the rust preventative with a liberal
amount of cleaner/degreaser, then let it soak
for 5–10 minutes.
3.
Wipe off the surfaces. If your cleaner/degreas-
er is effective, the rust preventative will wipe
off easily. If you have a plastic paint scraper,
scrape off as much as you can first, then wipe
off the rest with the rag.
4.
Repeat Steps 2–3 as necessary until clean,
then coat all unpainted surfaces with a quality
metal protectant to prevent rust.
NOTICE
Avoid chlorine-based solvents, such as
acetone or brake parts cleaner, that may
damage painted surfaces.
Inventory (Figure 11) Qty
A. Hex Wrench 4mm ....................................... 1
B. Hex Wrench 5mm ....................................... 1
C. Open-End Wrench 12/14mm ...................... 1
D. Handwheel Handles ................................... 3
E. Keys 5 x 5 x 20 ........................................... 2
F. Thumb Screws ........................................... 2
G. Graduated Dials ......................................... 2
H. Handwheels ................................................ 2
Figure 11. Model G0731 inventory.
ABD
EF
GH
C
NOTICE
If you cannot find an item on this list, care-
fully check around/inside the machine and
packaging materials. Often, these items get
lost in packaging materials while unpack-
ing or they are pre-installed at the factory.
Inventory
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.

Model G0731 (Mfd. Since 01/17) -17-
Site Considerations
Figure 12. Minimum working clearances.
= Electrical Connection
48"
68"
Min. 30"
for Maintenance
Wall
Min. 30"
for Maintenance
Wall
Weight Load
Refer to the Machine Data Sheet for the weight
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 work-
piece 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 main-
tenance and service described in this manual.
See below for required space allocation.
Physical Environment
The physical environment where the machine is
operated is important for safe operation and lon-
gevity of machine components. For best results,
operate this machine in a dry environment that is
free from excessive moisture, hazardous chemi-
cals, airborne abrasives, or extreme conditions.
Extreme conditions for this type of machinery are
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
Place this machine near an existing power source.
Make sure all power cords are protected from
traffic, material handling, moisture, chemicals,
or other hazards. Make sure to leave access to
a means of disconnecting the power source or
engaging a lockout/tagout device, if required.
Lighting
Lighting around the machine must be adequate
enough that operations can be performed safely.
Shadows, glare, or strobe effects that may distract
or impede the operator must be eliminated.
Children or untrained people
may be seriously injured by
this machine. Only install in an
access restricted location.

-18- Model G0731 (Mfd. Since 01/17)
To lift and place this mill:
1. After removing the crate from the shipping
pallet, wrap lifting straps around the turret,
as shown in Figure 13, and securely attach
them to your power lifting equipment.
Figure 13. Example of positioning lifting straps.
Turret
Lifting Straps
2. Use a 1⁄2" wrench to unbolt the mill from the
pallet.
3. With assistance to steady the machine, move
it as close to the prepared location as pos-
sible.
4. Lift it just enough to clear the pallet and any
floor obstacles, then situate it in its final posi-
tion.
5. When mounting the machine to the floor, use
a precision level to make sure the table is
level from side to side and front to back.
Note: If necessary, use shims to make sure
there are no gaps between the base and the
floor to avoid cracking or warping the cast
iron.
Lifting & Placing
HEAVY LIFT!
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.