Jet JWBS-12OS Service manual

Operating Instructions and Parts Manual
12-inch Woodworking Band Saw
Model: JWBS-12OS
WMH TOOL GROUP, Inc
2420 Vantage Drive
Elgin, Illinois 60124 Part No. M-708901B
Ph.: 800-274-6848 Revision C 06/07
www.wmhtoolgroup.com Copyright © 2007 WMH Tool Group, Inc.
This Manual is Bookmarked

2
Warranty and Service
WMH Tool Group, Inc., warrants every product it sells. If one of our tools needs service or repair, one of our
Authorized Service Centers located throughout the United States can give you quick service. In most cases, any of
these WMH Tool Group Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or
perform routine maintenance and major repair on your JET®tools. For the name of an Authorized Service Center in
your area call 1-800-274-6848.
MORE INFORMATION
WMH Tool Group is consistently adding new products to the line. For complete, up-to-date product information, check
with your local WMH Tool Group distributor, or visit jettools.com.
WARRANTY
JET products carry a limited warranty which varies in duration based upon the product (MW stands for Metalworking,
WW stands for Woodworking).
WHAT IS COVERED?
This warranty covers any defects in workmanship or materials subject to the exceptions stated below. Cutting tools,
abrasives and other consumables are excluded from warranty coverage.
WHO IS COVERED?
This warranty covers only the initial purchaser of the product.
WHAT IS THE PERIOD OF COVERAGE?
The general JET warranty lasts for the time period specified in the product literature of each product.
WHAT IS NOT COVERED?
Five Year and Lifetime Warranties do not cover products used for commercial, industrial or educational purposes.
Products with Five Year or Lifetime Warranties that are used for commercial, industrial or education purposes revert
to a One Year Warranty. This warranty does not cover defects due directly or indirectly to misuse, abuse, negligence
or accidents, normal wear-and-tear, improper repair or alterations, or lack of maintenance.
HOW TO GET SERVICE
The product or part must be returned for examination, postage prepaid, to a location designated by us. For the name
of the location nearest you, please call 1-800-274-6848.
You must provide proof of initial purchase date and an explanation of the complaint must accompany the
merchandise. If our inspection discloses a defect, we will repair or replace the product, or refund the purchase price,
at our option. We will return the repaired product or replacement at our expense unless it is determined by us that
there is no defect, or that the defect resulted from causes not within the scope of our warranty in which case we will,
at your direction, dispose of or return the product. In the event you choose to have the product returned, you will be
responsible for the shipping and handling costs of the return.
HOW STATE LAW APPLIES
This warranty gives you specific legal rights; you may also have other rights which vary from state to state.
LIMITATIONS ON THIS WARRANTY
WMH TOOL GROUP LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR
EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OR MERCHANTABILITY AND
FITNESS ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG THE IMPLIED
WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
WMH TOOL GROUP SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY,
OR FOR INCIDENTAL, CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE
OF OUR PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
WMH Tool Group sells through distributors only. The specifications in WMH catalogs are given as general information
and are not binding. Members of WMH Tool Group reserve the right to effect at any time, without prior notice, those
alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever.
JET®branded products are not sold in Canada by WMH Tool Group.

3
Table of Contents
Warranty and Service.................................................................................................................................... 2
Table of Contents.......................................................................................................................................... 3
Warnings ....................................................................................................................................................... 4
Specifications ................................................................................................................................................ 6
Unpacking ..................................................................................................................................................... 6
Shipping Contents......................................................................................................................................... 7
Assembly....................................................................................................................................................... 8
Stand ......................................................................................................................................................... 8
Mounting Bandsaw to Table...................................................................................................................... 8
Table Assembly ......................................................................................................................................... 9
Grounding Instructions ................................................................................................................................ 10
General Information................................................................................................................................. 10
115 Volt Operation................................................................................................................................... 10
Extension Cords ...................................................................................................................................... 10
Adjustments ................................................................................................................................................ 11
Tilting the Table ....................................................................................................................................... 11
Adjusting 90º Table Stop ......................................................................................................................... 11
Changing Blades ..................................................................................................................................... 11
Adjusting Blade Tension.......................................................................................................................... 12
Upper Blade Guide Positioning ............................................................................................................... 13
Upper Blade Guide Tension Adjustment.................................................................................................13
Blade Guide Block Adjustment................................................................................................................ 13
Blade Support Bearing Adjustment ......................................................................................................... 14
Adjusting V-Belt Tension ......................................................................................................................... 14
Adjusting Blade Tracking......................................................................................................................... 12
Troubleshooting JWBS-12OS Band Saw ...................................................................................................15
Parts ............................................................................................................................................................ 15
Ordering Replacement Parts................................................................................................................... 15
Body Assembly........................................................................................................................................ 16
Open Stand Assembly............................................................................................................................. 20
Optional Accessories .................................................................................................................................. 21
Electrical Connection .................................................................................................................................. 21
The specifications in this manual are given as general information and are not binding. WMH Tool Group,
Inc. reserves the right to effect, at any time and without prior notice, changes or alterations to parts,
fittings, and accessory equipment deemed necessary for any reason whatsoever.

4
Warnings
1. Read and understand the entire owner's manual before attempting assembly or operation.
2. Read and understand the warnings posted on the machine and in this manual. Failure to comply with
all of these warnings may cause serious injury.
3. Replace the warning labels if they become obscured or removed.
4. This band saw is designed and intended for use by properly trained and experienced personnel only.
If you are not familiar with the proper and safe operation of a band saw, do not use until proper
training and knowledge have been obtained.
5. Do not use this band saw for other than its intended use. If used for other purposes, WMH Tool
Group disclaims any real or implied warranty and holds itself harmless from any injury that may result
from that use.
6. Always wear approved safety glasses/face shields while using this band saw. Everyday eyeglasses
only have impact resistant lenses; they are not safety glasses.
7. Before operating this band saw, remove tie, rings, watches and other jewelry, and roll sleeves up past
the elbows. Remove all loose clothing and confine long hair. Non-slip footwear or anti-skid floor strips
are recommended. Do not wear gloves.
8. Always use the blade guard on all ''through-sawing'' operations. A through-sawing operation is one in
which the blade cuts completely through the workpiece.
9. Some dust created by power sanding, sawing, grinding, drilling and other construction activities
contain chemicals known to cause cancer, birth defects or other reproductive harm. Some examples
of these chemicals are:
•Lead from lead based paint.
•Crystalline silica from bricks, cement and other masonry products.
•Arsenic and chromium from chemically treated lumber.
Your risk of exposure 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 face or dust masks that are specifically designed to filter out microscopic
particles.
10. Do not operate this machine while tired or under the influence of drugs, alcohol or any medication.
11. Make certain the switch is in the OFF position before connecting the machine to the power supply.
12. Make certain the machine is properly grounded.
13. Make all machine adjustments or maintenance with the machine unplugged from the power source.
14. Remove adjusting keys and wrenches. Form a habit of checking to see that keys and adjusting
wrenches are removed from the machine before turning it on.
15. Keep safety guards in place at all times when the machine is in use. If removed for maintenance
purposes, use extreme caution and replace the guards immediately.
16. Make sure the band saw is firmly secured to the floor or bench before use.
17. Check damaged parts. Before further use of the machine, a guard or other part that is damaged
should be carefully checked to determine that it will operate properly and perform its intended
function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting
and any other conditions that may affect its operation. A guard or other part that is damaged should
be properly repaired or replaced.
18. Provide for adequate space surrounding work area and non-glare, overhead lighting.

5
19. Provide for adequate space surrounding work area and non-glare, overhead lighting.
20. Keep the floor around the machine clean and free of scrap material, oil and grease.
21. Keep visitors a safe distance from the work area. Keep children away.
22. Make your workshop child proof with padlocks, master switches or by removing starter keys.
23. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.
24. Maintain a balanced stance at all times so that you do not fall into the blade or other moving parts. Do
not overreach or use excessive force to perform any machine operation.
25. Use the right tool at the correct speed and feed rate. Do not force a tool or attachment to do a job for
which it was not designed. The right tool will do the job better and safer.
26. Use recommended accessories; improper accessories may be hazardous.
27. Maintain tools with care. Keep saw blades sharp and clean for the best and safest performance.
Follow instructions for lubricating and changing accessories.
28. Make sure the work piece is held firmly against the rip fence or miter gauge as it is fed through the
blade.
29. Turn off the machine before cleaning. Use a brush or compressed air to remove chips or debris — do
not use your hands.
30. Do not stand on the machine. Serious injury could occur if the machine tips over.
31. Never leave the machine running unattended. Turn the power off and do not leave the machine until it
comes to a complete stop.
32. Remove loose items and unnecessary work pieces from the area before starting the machine.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result in minor injury and/or
possible machine damage.
This means that if precautions are not heeded, it may result in serious injury or possibly
even death.

6
Specifications
Model Number.............................................................................................................................JWBS-12OS
Stock Number ...................................................................................................................................708901B
Cutting Capacity (height/in.).......................................................................................................................... 6
Cutting Capacity (width/in.) ...................................................................................................................11-7/8
*Minimum Blade Width (in.)........................................................................................................................ 1/8
*Maximum Blade Width (in.)....................................................................................................................... 1/2
*Blade Length (in.) ...................................................................................................................................... 82
Blade Speed (SFPM) .............................................................................................................................. 2750
Table Size (in.) .................................................................................................................................... 14 x 14
Table Slot Size (DxW/in.) .................................................................................................................. 3/8 x 3/4
Table Height from Floor (in.) ................................................................................................................40-5/8”
Table Tilt..................................................................................................................................45º right, 5º left
Dust Chute Diameter................................................................................................................ 2”OD & 4” OD
Overall Dimensions (HxWxD/in.) ..............................................................................62-3/8 x 18-5/8 x 15-5/8
Motor ................................................................................................................................. 1/2 HP, 1Ph, 115V
Net Weight (lbs.) ........................................................................................................................132 (approx.)
Shipping Weight (lbs.) ................................................................................................................141 (approx.)
* The JWBS-12OS Band Saw comes equipped with a 1/4"x82"x20" blade (Part No. 709392) factory
installed.
Read and understand the entire contents of this manual before attempting
assembly or operation! Failure to comply may cause serious injury!
Unpacking
1. Remove all contents from the shipping
carton. Do not discard the carton or packing
material until the bandsaw is assembled and
is running satisfactorily.
2. Inspect the contents for shipping damage.
Report damage, if any, to your distributor.
The required hardware for all assembly on this
machine is found in the Hardware Bag for Stand
Assembly and Hardware Bag for Saw Body and
listed in the following page.
3. Compare the contents of the shipping carton
with the Shipping Contents on page 7.
Report shortages, if any, to your distributor.
Tools Required for Assembly
1 Accurate Straight Edge (approximately 2 ft)
1 Cross-point Screwdriver
1 4mm Hex Wrench (included)
1 5mm Hex Wrench
1 6mm Hex Wrench (included)
1 10mm Box Wrench
1 13mm Box Wrench
Note: Use of sockets and ratchets will speed
assembly time but are not required.

7
Shipping Contents
Contents of the Carton
A Body Assembly (1)
B Table (1)
C Trunnion, Clamp Shoe & Lock Handle (1)
D Hose Adapter (1)
E Stand Leg (4)
F Base Plate (1)
G Hardware Bag for Stand (1)
(contents shown below)
H Hardware Bag for Saw Body (1)
(contents shown below)
K Short Support Plate (2)
L Long Support Plate (2)
– Manual (not shown)
Hardware for Saw Body (actual size)
Hardware for Stand
Q Hex Nut M8 (40)
S Lock Washer M8 (40)
T Flat Washer M8xØ18 (40)
W Carriage Bolt M8x16 (40)
Contents of the Carton
Hardware for Saw Body
M Hex Cap Screw M6x70 (1)
N Hex Cap Screw M8x35 (4)
O Hex Cap Screw M8x20 (4)
P Flat Washer M8xØ23 (8)
Q Hex Nut M8 (4)
R Hex Nut M6 (1)
S Lock Washer M8 (8)
T Flat Washer M8xØ18 (4)
U 4mm Hex Wrench (1)
V 6mm Hex Wrench (1)
Hardware for Stand (actual size)

8
Assembly
Read and understand all
assembly instructions before attempting
assembly! Failure to comply may cause
serious injury!
Stand
Referring to Figure 1.
1. Assemble four legs (E) to the table (F). Secure
each leg with six ea M8x16 carriage bolts (W),
M8 flat washers (T), M8 lock washers (S), and
M8 hex nuts (Q). Hand-tighten only at this time.
2. Assemble the long plates (L) to the legs (E).
Secure each plate with 4 ea M8x16 carriage
bolts (W), M8 flat washers (T), M8 lock
washers (S), and M8 hex nuts (Q). Hand-
tighten only at this time.
3. Assemble the short plates (K) in the same
manner as described in step 2.
4. Place the stand upright on a level surface.
Make sure that all four legs are contacting the
surface.
5. Tighten all nuts with a 13mm socket or wrench.
Mounting Bandsaw to Table
The saw body is heavy! Use
caution when lifting! Stabilize until firmly
attached to the stand! Failure to comply may
cause serious injury!
Referring to Figure 2:
1. With the aid of a second person, lift the saw
body (A) and place onto the stand top. Be sure
front of saw (with JET logo) faces stand front
(JET logo).
2. Place four M8 flat washers (P) on four M8x35
hex cap screws (N) and insert screws through
four mounting holes in the bandsaw and stand.
3. Place M8 flat washers (P) and M8 lock wash-
ers (S) on the ends of the screws protruding
through the bottom of the stand top. Secure
with four M8 hex nuts (Q).
4. Tighten all nuts with a 13mm socket or wrench.
W
W
S
TQ
F
EL
S
T
Q
K
W
S
T
Q
L
K
E
Figure 1
A
Stand Top
Front
N
P
P
S
QQ
S
P
N
P
Figure 2

9
Table Assembly
For this section, refer to Figure 3.
90º Table Stop
1. Thread the M6 hex nut (R) approximately half
way onto the M6x70 hex cap screw (M). Then
thread the screw half way into the bracket (AB).
Adjustment will be made later.
Trunnion Installation
2. Position the trunnion (C) on top of the trunnion
support bracket (CC). The scale on the trun-
nion must be on the same side as the indicator
arrow on the bracket.
3. Place the clamp shoe (CA) through the middle
slot at the top of the trunnion (C), inserting the
screw through the slotted opening at the
bottom of the trunnion and through the support
bracket (CC).
4. Thread the lock handle (CB) onto the screw
protruding through the bottom of the support
bracket (CC). Adjust the trunnion (C) to 0º, then
secure by tightening the lock handle (CB).
Table Installation
5. Remove the insert (BA) and pin (BB) from the
table (B).
6. Maneuver the table (B) to allow the saw
blade (AA) to pass through the slot (BC) to the
round opening in the center.
7. Orient the table (B) as shown.
8. Line up four threaded mounting holes
underneath the table (B) with the four mount-
ing through-holes on the trunnion (C).
9. Secure with four each M8x20 hex cap
screws (O), M8 lock washers (S) and M8xØ18
flat washers (T).
10. Tighten the screws (O) with a 13mm wrench.
Right
T
C
C
A
C
B
S
O
B
A
B
B
B
D
C
C
B
C
Left
A
A
M
R
A
B
Figure 3

10
Grounding Instructions
General Information
This Band Saw must be
grounded while in use to protect the operator
from electric shock.
In the event of a malfunction or breakdown,
grounding provides a path of least resistance for
electric current to reduce the risk of electric
shock. This tool is equipped with an electric cord
having an equipment-grounding conductor and a
grounding plug that looks similar to the plug in
Figure 4. The plug must be inserted into a
matching outlet that is properly installed and
grounded in accordance with all local codes and
ordinances.
Do not modify the plug provided. If it will not fit
the outlet, have the proper outlet installed by a
qualified electrician.
Improper connection of the equipment-
grounding conductor can result in a risk of
electric shock. The conductor, with insulation
having an outer surface that is green with or
without yellow stripes, is the equipment-
grounding conductor. If repair or replacement of
the electric cord or plug is necessary, do not
connect the equipment-grounding conductor to a
live terminal.
Figure 4
Check with a qualified electrician or service
personnel if the grounding instructions are not
completely understood, or if in doubt as to
whether the tool is properly grounded.
Repair or replace a damaged or worn cord
immediately.
115 Volt Operation
As received from the factory, your bandsaw is
ready to run at 115-volt operation. This
bandsaw, when wired for 115 volts, is intended
for use on a circuit that has an outlet and a plug
that looks like the one illustrated in Figure 4. A
temporary adapter, like the adapter in Figure 5,
may be used to connect this plug to a two-pole
receptacle, as shown in Figure 5, if a properly
grounded outlet is not available. The temporary
adapter should only be used until a properly
grounded outlet can be installed by a qualified
electrician. This adapter is not applicable in
Canada. The green colored rigid ear, lug, or tab,
extending from the adapter, must be connected
to a permanent ground such as a properly
grounded outlet box, as shown in Figure 5.
Figure 5
Extension Cords
Use only three wire extension cords that have
three-prong grounding plugs and three-pole
receptacles that accept the tool’s plug.
Make sure the cord is in good condition and
heavy enough to carry the current your band
saw will draw. An undersized cord will cause a
drop in line voltage, resulting in loss of power
and overheating. Table 1 shows the correct size
to use depending on cord length and the ampere
rating on your machine’s nameplate. If in doubt,
use the next heavier gauge. The smaller the
gauge number, the heavier the cord.
Repair or replace a damaged or worn cord
immediately.
Power Extension Cord
Currant
(Amps)
Line
voltage
Cord length
in feet
Cord gauge
(AWG)
0 to 25 18
25 to 50 16
50 to 100 16
0-6 120
over 100 14
0 to 25 18
25 to 50 16
50 to 100 14
6-10 120
over 100 12
0 to 25 16
25 to 50 16
50 to 100 14
10-12 120
over 100 12
0 to 25 14
25 to 50 12
12-16 120
over 50 not recommended
Table 1

11
Adjustments
Unplug the machine from the
power source before making any repairs or
adjustments. Failure to comply may cause
serious injury.
Tilting the Table
Referring to Figure 6:
1. Loosen the lock handle.
2. Tilt table up to 45 degrees to the right or up to
5 degrees to the left. The angle can be read on
the scale mounted to the trunnion.
3. Tighten the lock handle.
Note: To allow the table to tilt to the left, the table
stop must be adjusted downward (see below).
Adjusting 90º Table Stop
Refer to Figure 6 except where noted otherwise.
1. Disconnect machine from power source.
2. Loosen the lock handle and tilt the table
bringing it to rest against the table stop.
3. Use a square placed on the table and against
the blade (Figure 7) to see if the table is 90
degrees to the blade.
4. If an adjustment is necessary, loosen the lock
handle, tilt table from the table stop as shown,
and lock in place.
5. Loosen the jam nut and turn the table stop left
or right to raise or lower the stop. Tighten the
jam nut to hold the table stop in place.
6. Unlock the table, tilt back letting it rest against
the stop and confirm table is 90 degrees with
the blade.
Changing Blades
Blade teeth are sharp! Use care
when handling the saw blade. Failure to comply
may cause serious injury.
Note: The JWBS-12OS Band Saw comes
equipped with a 1/4"x82"x20" blade (Part No.
709392) factory installed.
Referring to Figure 8:
1. Disconnect machine from power source.
2. Open both wheel covers (D, E).
3. Loosen the hex screw (using a 10mm wrench)
securing the blade guard (H) and remove.
Figure 6
Figure 7
Figure 8

12
4. Remove the table insert (B) and table pin (C).
5. Loosen blade tension by turning the tension
knob (A) counterclockwise.
6. Remove blade (J) from upper and lower wheels
and from between the upper (F) and lower
blade guides (G).
7. Turn the blade to direct it through the slot in
table and remove.
8. Guide the new blade through table slot leading
with the smooth edge. Place it around the
upper and lower wheels and into the upper (F)
and lower blade guides (G).
Note: The blade teeth should face the operator,
and they should point down toward the table.
9. Position the blade to track in the middle of the
rubber tires on the wheels.
10. Re-install the table insert (B), table pin (C) and
blade guard (H).
11. Tension and track the blade before operating
saw (see Adjusting Blade Tension and
Adjusting Blade Tracking sections below).
Adjusting Blade Tension
Referring to Figure 9:
1. Disconnect machine from power source.
2. Turn blade tension knob clockwise to tension
blade.
3. Apply just enough tension to take the slack out
of the blade.
4. Turn one wheel a few times to move the blade
to the center of the tire.
5. With a meter, tension the blade appropriately
for the size of blade used.
6. A gauge on the upper wheel slide bracket
indicates the approximate tension according to
the width of the blade. Initially, set the blade
tension to correspond to the blade width as
marked on the gauge.
Note 1: As you become more experienced with the
saw, you may find it necessary to change the blade
tension from the initial setting. Changes in blade
width and the type of material being cut will have
an effect on blade tension.
Note 2: Keep in mind that too little or too much
blade tension can cause blade breakage.
Adjusting Blade Tracking
Referring to Figure 9:
Disconnect machine from the
power source! Never adjust blade tracking with
the machine running! Failure to comply may
cause serious injury!
Tracking refers to how the blade is situated upon
the wheels while in motion. The blade should track
in the center of both wheels.
Figure 9
The blade must be properly tensioned before
adjusting blade tracking. Make sure blade guides
and blade bearings do not interfere with the blade.
1. Open the top wheel cover. Rotate the wheel
forward by hand, and observe the position of
the blade on the wheel. It should be in the
center of the wheel.
2. If adjustment is necessary, loosen wing nut.
Tightening the tracking knob slightly will move
blade so it tracks towards the rear of machine.
Loosening the tracking knob slightly will cause
the blade to track toward the front of the
machine.
3. After blade is tracking in the center of the
wheel, tighten the wing nut.

13
Upper Blade Guide Positioning
Refer to Figure 10. The blade guard has been
removed for clarity.
Never operate the Band Saw
without all guards in place and in working
order.
The upper blade guide assembly should be
adjusted to just above the material being cut. To
adjust:
1. Disconnect machine from power source.
2. Loosen lock knob (A) and raise or lower the
upper blade guide assembly (C).
3. Tighten lock knob (A). Make sure blade guide
blocks (D) are still flat to the blade. If
adjustment is necessary, loosen screw (E) and
rotate the assembly until the guide blocks (D)
are flat to blade.
Upper Blade Guide Tension Adjustment
If the movement of the blade guide assembly
seems “stiff” when being raised or lowered, it can
be adjusted to slide more easily. This is controlled
by an internal spring and ball that provides varying
degrees of resistance against the guide post.
To adjust tension on the spring:
1. Using a 5mm hex wrench (not provided), tight-
en or loosen the setscrew (B) until desired
tension is reached.
2. Reattach and tighten the knob (A).
Blade Guide Block Adjustment
This adjustment is the same for upper and lower
blade guides. Only the upper blade guide is shown.
Never operate the Band Saw
without all guards in place and in working
order.
Referring to Figure 11:
1. Disconnect machine from power source.
2. Remove the blade guard (upper blade guide
only).
Note: Blade must already be tensioned and
tracking properly.
3. Loosen thumbscrews (A) and move the guide
blocks (B) as close to the blade (C) as possible
without pinching it.
Figure 10
Figure 11
4. Tighten thumbscrews (A).
5. Loosen screw (D) (4mm hex wrench) and
move the guide block bracket (E) in or out until
the front edge of the guide blocks (B) are just
behind the "gullets" of the saw teeth. Loosen
the screw (F) securing the blade support
bearing (G) if necessary.
6. Tighten screw (D).
7. Replace the blade guard.

14
Blade Support Bearing Adjustment
Never operate the Band Saw
without all guards in place and in working
order.
This adjustment is the same for upper and lower
blade guides. Only the upper blade guide is shown.
Referring to Figure 11:
1. Remove the blade guard (upper blade guide
only).
2. Loosen screw (D) (with 4mm hex wrench).
3. Adjust for a gap of 1/64" between the
bearing (F) and blade (C).
Note: To set this distance quickly, you can place a
dollar bill or piece of paper between support
bearing and back of blade.
4. Tighten screw (D).
5. Replace the blade guard.
Adjusting V-Belt Tension
Never operate the Band Saw
without all guards in place and in working
order.
Referring to Figure 12:
1. Unplug the machine from the power source.
2. Remove the saw blade as described in
Changing Blades on page 11.
3. With a 13mm wrench, remove the hex cap
screw (A).
Note: The hex cap screw has a reverse/left-
hand thread. Turn clockwise to remove.
4. Remove the washer (B) and wheel (C).
5. With a 6mm hex wrench, loosen four hex
socket cap screws (D).
6. Push the motor down to add tension to the
belt (E).
7. The belt is properly tensioned when moderate
finger pressure on the belt between the two
pulleys caused a 1/2" deflection.
8. Tighten the four hex socket cap screws (D).
9. Replace the wheel (C), washer (B) and hex
nut (A).
10. Re-install the blade as described in Changing
Blades on page 11.
Figure 12

15
Troubleshooting JWBS-12OS Band Saw
Trouble Probable Cause Remedy
Saw unplugged. Check all plug connections.
Fuse blown or circuit breaker tripped. Replace fuse, or reset circuit breaker.
Saw stops or will not
start.
Cord damaged. Replace cord.
Table stop not adjusted correctly. Check blade with square and adjust
table stop.
Angle pointer not set accurately. Check blade with square and adjust
pointer.
Does not make
accurate 45 or 90
degree cuts.
Miter gauge out of adjustment. Adjust miter gauge.
Fence not aligned with blade. Check and adjust fence (see fence
manual).
Warped wood. Select another piece of wood.
Excessive feed rate. Reduce feed rate.
Incorrect blade for cut. Change blade to correct type.
Blade tension not set properly. Set blade tension according to blade
size.
Blade wanders during
cut.
Guides not set properly. Adjust guides.
Dull blade. Replace blade.
Blade mounted wrong. Teeth should face operator and point
downward.
Gum or pitch on blade. Remove blade and clean with oven
cleaner or other solvent.
Incorrect blade for cut. Change blade to correct type.
Saw makes
unsatisfactory cuts.
Gum or pitch on table. Clean table.
Extension cord too light or too long. Replace with adequate size and
length cord.
Blade does not come
up to speed.
Low shop voltage. Contact your local electric company.
Base on uneven floor. Reposition on flat, level surface.
Saw vibrates
excessively. Loose fasteners. Tighten fasteners.
Parts
Ordering Replacement Parts
To order parts or reach our service department, call 1-800-274-6848 between 7:30am and 5:30pm (CST),
Monday through Friday. Having the Model Number and Serial Number of your machine available when
you call will allow us to serve you quickly and accurately.

16
Body Assembly
Index No. Part No. Description Size Qty
1 ...............JWBS12OS-001.......Band Saw Frame ................................................. .................................... 1
2 ...............120002 .....................Guide Bracket ...................................................... .................................... 2
3 ...............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 6
4 ...............120003 .....................Stud...................................................................... .................................... 1
5 ...............NH121901................Nut........................................................................ M12 x 1.25 .................. 1
6 ...............100016A...................Upper Wheel Sliding Bracket ............................... .................................... 1
7 ...............100021 .....................Steel Pin............................................................... .................................... 2
8 ...............AB100019 ................Shaft Hinge .......................................................... .................................... 1
9 ...............990652 .....................Knob..................................................................... .................................... 1
10 .............NW080000 ...............Wing Nut .............................................................. M8 ............................... 1
11 .............AB120020 ................Blade Adjusting Screw ......................................... .................................... 1
12 .............100015A...................Coil Spring............................................................ .................................... 1
13 .............NS101700 ................Square Nut ........................................................... M10............................. 1
14 .............MH120000W ............Motor .................................................................... 1/2 HP, 1Ph, 115V ...... 1
15 .............CC163501................Motor Cord ........................................................... .................................... 1
16 .............CC163001................Power Cord .......................................................... .................................... 1
17 .............120021W..................Cord Locating Plate ............................................. .................................... 1
18 .............998621 .....................Strain Relief.......................................................... .................................... 2
19 .............TS-1540031 .............Hex Nut ................................................................ M5 ............................... 2
20 .............SF059100 ................Pan Head Screw w/Flange .................................. M5 x 6 ......................... 2
21 .............WE05000 .................Gear Washer........................................................ M5 ............................... 2
22 .............SF069200 ................Pan Head Screw w/Flange .................................. M6 x 8 ......................... 2
23 .............JWBS12OS-023.......Toggle Switch ...................................................... .................................... 1
24 .............TS-1533052 .............Pan Head Screw .................................................. M5 x 16 ....................... 2
25 .............TS-1504051 .............Socket Head Cap Screw...................................... M8 x 25 ....................... 4
26 .............TS-1551061 .............Lock Washer ........................................................ M8 ............................... 4
27 .............360085 .....................Bushing ................................................................ .................................... 1
28 .............120004 .....................Upper Wheel ........................................................ .................................... 1
29 .............120005 .....................Wheel Tire............................................................ .................................... 1
30 .............RR350000................Retaining Ring ..................................................... R35 ............................. 1
31 .............BB-6202ZZ...............Ball Bearing.......................................................... 6202ZZ........................ 2
32 .............NH121901................Nut........................................................................ M12 ............................. 1
33 .............120006 .....................Lower Wheel ........................................................ .................................... 1
34 .............120005 .....................Wheel Tire............................................................ .................................... 1
35 .............KP050520 ................Key ....................................................................... 5 x 5 x 20 .................... 1
36 .............SH080402 ................Hex Cap Bolt (Left Hand Thread) ........................ M8 x 20 (LH) ............... 1
37 .............WF083030 ...............Washer................................................................. M8 ............................... 1
38 .............709392 .....................Saw Blade (6 T.P.I.)............................................. 1/4 x 82 x .020 ............ 1
39 .............170507 .....................Brush.................................................................... .................................... 1
40 .............TS-1533032 .............Pan Head Screw .................................................. M5 x 10 ....................... 1
41 .............150079 .....................Catch.................................................................... .................................... 1
42 .............TS-1533032 .............Pan Head Screw .................................................. M5 x 10 ....................... 1
43 .............120007W..................Upper Wheel Cover ............................................. .................................... 1
44 .............150080 .....................Clip ....................................................................... .................................... 1
48 .............WI080000.................Gear Washer (internal) ........................................ .................................... 1
49 .............150024 .....................Knob..................................................................... M8 ............................... 1
50 .............ST049200 ................Tap Screw............................................................ M4 x 8 ......................... 3
51 .............120009 .....................Hinge.................................................................... .................................... 1
52 .............TS-1534041 .............Flat Head Screw .................................................. M5 x 10 ....................... 3
53 .............150079 .....................Catch.................................................................... .................................... 1
54 .............TS-1533032 .............Pan Head Screw .................................................. M5 x 10 ....................... 1
55 .............120008W..................Lower Wheel Cover ............................................. .................................... 1
56 .............150080 .....................Clip ....................................................................... .................................... 1
60 .............WI080000.................Gear Washer (internal) ........................................ .................................... 1
61 .............150024 .....................Knob..................................................................... M8 ............................... 1

17
Body Assembly
Index No. Part No. Description Size Qty
62 .............ST049200 ................Tap Screw............................................................ M4 x 8 ......................... 3
63 .............120009 .....................Hinge.................................................................... .................................... 1
64 .............TS-1534041 .............Flat Head Screw .................................................. M5 x 10 ....................... 3
65 .............120010 .....................Guide Post Bracket .............................................. .................................... 1
66 .............990651 .....................Knob..................................................................... .................................... 1
67 .............SB-5/16 ....................Steel Ball .............................................................. .................................... 1
68 .............150099 .....................Spring................................................................... .................................... 1
69 .............TS-1525011 .............Set Screw............................................................. M10 x 10 ..................... 1
70 .............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 4
71 .............120011 .....................Guide Post ........................................................... .................................... 1
72 .............120012 .....................Upper Support Bracket Post ................................ .................................... 1
73 .............TS-1482021 .............Hex Cap Screw .................................................... M6 x 12 ....................... 1
74 ............. 120013 .....................Bracket ................................................................. .................................... 1
75 .............120014 .....................Spacing Sleeve .................................................... .................................... 1
76 .............BB-608ZZ.................Ball Bearing.......................................................... 608ZZ.......................... 1
77 .............SF059100 ................Pan Head Screw w/Flange .................................. M5 x 6 ......................... 1
78 .............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 1
79 .............KP080816 ................Guide Block.......................................................... 8 x 8 x 16 .................... 2
80 .............SU069300 ................Thumb Screw ....................................................... M6 x 12 ....................... 2
81 .............TS-1482021 .............Hex Cap Screw .................................................... M6 x 12 ....................... 1
82 .............TS-1550041 .............Flat Washer.......................................................... M6 ............................... 1
83 .............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 1
84 .............TS-1550041 .............Flat Washer.......................................................... M6 ............................... 1
85 .............120016 .....................Upper Wheel Blade Guard................................... .................................... 1
86 .............120015 .....................Lower Support Bracket Post ................................ .................................... 1
87 .............SF069300 ................Pan Head Screw w/Flange .................................. M6 x 12 ....................... 4
88 ............. 120013 .....................Bracket ................................................................. .................................... 1
89 .............120014 .....................Spacing Sleeve .................................................... .................................... 1
90 .............BB-608ZZ.................Ball Bearing.......................................................... 608ZZ.......................... 1
91 .............SF059100 ................Pan Head Screw w/Flange .................................. M5 x 6 ......................... 1
92 .............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 1
93 .............KP080818 ................Guide Block.......................................................... 8 x 8 x 18 .................... 2
94 .............SU069300 ................Thumb Screw ....................................................... M6 x 12 ....................... 2
95 .............TS-2246122 .............Button Head Socket Screw .................................. M6 x 12 ....................... 1
96 .............TS-1550041 .............Flat Washer.......................................................... M6 ............................... 1
97 .............150031 .....................Pin ........................................................................ .................................... 2
100 ...........150058 .....................Pointer.................................................................. .................................... 1
104 ...........JWBS12OS-104.......Table .................................................................... .................................... 1
105 ...........JWBS12OS-105.......Table Insert .......................................................... .................................... 1
107 ...........JWBS12OS-107.......Table Pin.............................................................. .................................... 1
108 ...........JWBS12OS-108.......Trunnion Bracket.................................................. .................................... 1
109 ...........JWBS12OS-109.......Trunnion ............................................................... .................................... 1
110 ...........TS-1490031 .............Hex Cap Screw .................................................... M8 x 20 ....................... 4
113 ...........SH081400 ................Hex Cap Bolt........................................................ M8 x 70 ....................... 1
114 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................... 1
115 ...........JWBS12OS-115.......Lock Handle ......................................................... .................................... 1
.................TS-152707 ...............Hex Wrench (not shown) .....................................6mm............................ 1
.................TS-152705 ...............Hex Wrench (not shown) .....................................4mm............................ 1
118 ...........TS-1540041 .............Hex Nut ................................................................ M6 ............................... 1
119 ...........TS-1540061 .............Hex Nut ................................................................ M8 ............................... 4
120 ...........SH061400 ................Hex Cap Bolt........................................................ M6 x 70 ....................... 1
121 ...........TS-1504131 .............Socket Head Cap Screw...................................... M8 x 70 ....................... 4
122 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................... 2
123 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................... 8
124 ...........TS-2361081 .............Lock Washer ........................................................ M8 ............................... 6

18
Body Assembly
Index No. Part No. Description Size Qty
125 ...........JW1000....................Reducer................................................................ .................................... 1
126 ...........120026 .....................Main Shaft ............................................................ .................................... 1
127 ...........120024W..................Bushing ................................................................ .................................... 1
128 ...........TS-1522031 .............Set Screw............................................................. M5 x 10 ....................... 2
129 ...........BB-6203VV ..............Ball Bearing.......................................................... 6203LLU ..................... 2
131 ...........TS-1504041 .............Socket Head Cap Screw...................................... M8 x 20 ....................... 3
132 ...........TS-1551061 .............Lock Washer ........................................................ M8 ............................... 3
133 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................... 4
134 ...........VB-A18.....................V-Belt ................................................................... A-18 ............................ 1
135 ...........200106 .....................Pulley ................................................................... .................................... 1
136 ...........120028 .....................Pulley ................................................................... .................................... 1
137 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................... 1
138 ...........TS-1490021 .............Hex Cap Screw .................................................... M8 x 16 ....................... 1
139 ...........TS-1490061 .............Hex Cap Screw .................................................... M8 x 35 ....................... 4
140 ...........JWBS12OS-140.......Switch Plate ......................................................... .................................... 1
150 ...........JWBS12OS-150.......Trunnion Clamp Shoe .......................................... .................................... 1
151 ...........JWBS12OS-151.......Scale Label .......................................................... .................................... 1
.................JSL12BS-MFC .........Motor Fan Cover (not shown) .............................. .................................... 1
.................JSL12BS-CC............Capacitor Cover (not shown) ............................... .................................... 1
.................JSL12BS-CAP .........Capacitor (not shown).......................................... .................................... 1
.................AH-120101...............Hardware Kit (Saw Body)..................................... .................................... 1

19
Body Assembly

20
Open Stand Assembly
Index No. Part No. Description Size Qty
141 ...........JWBS12OS-141.......Stand Top............................................................. .................................... 1
142 ...........JWBS12OS-142.......JET Logo.............................................................. .................................... 1
143 ...........150603W..................Support Leg.......................................................... .................................... 4
144 ...........612050W..................Support Plate (long) ............................................. .................................... 2
145 ...........612051W..................Support Plate (short)............................................ .................................... 2
146 ...........TS-1540061 .............Hex Nut ................................................................ M8 ............................. 40
147 ...........SC089400 ................Carriage Bolt ........................................................ M8 x 16 ..................... 40
148 ...........TS-1550061 .............Flat Washer.......................................................... M8 ............................. 40
149 ...........TS-2361081 .............Lock Washer ........................................................ M8 ............................. 40
.................AH-61202K ..............Hardware Kit (Stand Assembly)........................... .................................... 1