Jet JPJ-12B Service manual

Operating Instructions and Parts Manual
12-inch Planer/Jointer
Models JPJ-12B, JPJ-12BHH
JET
427 New Sanford Road
La Vergne, Tennessee 37086 Part No. M-715100
Ph.: 800-274-6848 Edition 1 10/2021
www.jettools.com Copyright © 2021 JET

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1.0 Warranty and Service
JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please
contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday.
Warranty Period
The general warranty lasts for the time period specified in the literature included with your product or on the official JET
branded website.
JET products carry a limited warranty which varies in duration based upon the product. (See chart below)
Accessories carry a limited warranty of one year from the date of receipt.
Consumable items are defined as expendable parts or accessories expected to become inoperable within a
reasonable amount of use and are covered by a 90-day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to the limitations stated below. This warranty
does not cover failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear,
improper repair, alterations, or lack of maintenance. JET woodworking machinery is designed to be used with Wood.
Use of these machines in the processing of metal, plastics, or other materials may void the warranty. The exceptions
are acrylics and other natural items that are made specifically for wood turning.
Warranty Limitations
Woodworking products with a Five-Year Warranty that are used for commercial or industrial purposes default to a Two-
Year Warranty. Please contact Technical Service at 1-800-274-6846 for further clarification.
How to Get Technical Support
Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof
of initial purchase when calling. If a product requires further inspection, the Technical Service representative will
explain and assist with any additional action needed. JET has Authorized Service Centers located throughout the United
States. For the name of an Authorized Service Center in your area call 1-800-274-6846 or use the Service Center
Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor
or visit the JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT.
EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN
IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET 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.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are
given as general information and are not binding. JET reserves 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 JPW Industries, Inc.
Product Listing with Warranty Period
90 Days –Parts; Consumable items
1 Year –Motors; Machine Accessories
2 Year –Metalworking Machinery; Electric Hoists, Electric Hoist Accessories; Woodworking Machinery used
for industrial or commercial purposes
5 Year –Woodworking Machinery
Limited Lifetime –JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools; Air Tools
Note: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries, Inc.,
or any of its successors in interest to the JET brand.

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2.0 Table of Contents
Section Page
1.0 Warranty and Service.....................................................................................................................................2
2.0 Table of Contents...........................................................................................................................................3
3.0 Safety Warnings.............................................................................................................................................4
4.0 Specifications.................................................................................................................................................6
5.0 Features and Terminology .............................................................................................................................7
6.0 Receiving .......................................................................................................................................................7
7.0 Unpacking ......................................................................................................................................................7
9.1 Contents of Shipping Container .................................................................................................................7
8.0 Electrical Connection .....................................................................................................................................7
9.0 Operating Controls.........................................................................................................................................8
9.1 Jointer to Planer Setup...............................................................................................................................8
9.2 Planer to Jointer Setup...............................................................................................................................8
9.3 Control Switch............................................................................................................................................9
9.4 Planer Controls and Adjustments...............................................................................................................9
9.5 Jointer Controls and Adjustments ..............................................................................................................9
10.0 Adjustments ...............................................................................................................................................10
10.1 Fence Stop Adjustments ........................................................................................................................10
10.2 Table and Knife Adjustments .................................................................................................................11
10.3 Coplanar Alignment................................................................................................................................11
10.4 Setting Knives at Correct Height and Parallel to Outfeed Table ............................................................13
10.5 Replacing Cutterhead Knives (Straight Knives Only).............................................................................15
10.6 Replacing or Rotating Knife Inserts (Helical Cutterhead Only) ..............................................................16
10.7 Jointer Table Lock Handle Adjustment...................................................................................................16
10.8 Belt Replacement...................................................................................................................................17
10.9 Feed Roller Height Adjustment ..............................................................................................................18
10.10 Feed Roller Pressure Adjustment ........................................................................................................18
10.11 Planer Table Adjustment......................................................................................................................19
11.0 Basic Operations........................................................................................................................................20
11.1 Dust Collection .......................................................................................................................................20
11.2 Initial Startup ..........................................................................................................................................20
11.3 Changing Mode of Operation .................................................................................................................20
11.4 Jointer Operations..................................................................................................................................20
11.5 Planer Operations ..................................................................................................................................22
12.0 Maintenance...............................................................................................................................................23
12.1 Blade Care .............................................................................................................................................23
12.2 Sharpening the Knives (Straight Knives Only) .......................................................................................24
13.0 Lubrication..................................................................................................................................................24
14.0 Troubleshooting the JPJ-12B,JPJ-12BHH.................................................................................................25
14.1 Performance Troubleshooting –Jointer.................................................................................................25
14.2 Performance Troubleshooting –Planer..................................................................................................26
14.3 Mechanical Troubleshooting –Planer/Jointer........................................................................................27
15.0 Replacement Parts.....................................................................................................................................27
15.1 Infeed Table Assembly –Exploded View...............................................................................................28
15.2 Infeed Table Assembly –Parts List........................................................................................................29
15.3 Outfeed Table Assembly –Exploded View............................................................................................30
15.4 Outfeed Table Assembly –Parts List.....................................................................................................31
15.5 Cutterhead Assembly –Exploded View.................................................................................................32
15.6 Cutterhead Assembly –Parts List..........................................................................................................33
15.7 Planer Table Assembly –Exploded View...............................................................................................34
15.8 Planer Table Assembly –Parts List .......................................................................................................35
15.9 Blade Guard Assembly –Exploded View...............................................................................................36
15.10 Blade Guard Assembly –Parts List......................................................................................................37
15.11 Gearbox Assembly –Exploded View...................................................................................................38
15.12 Gearbox Assembly –Parts List............................................................................................................39
15.13 Cabinet Assembly –Exploded View.....................................................................................................40
15.14 Cabinet Assembly –Parts List .............................................................................................................41
15.15 Fence Assembly –Exploded View.......................................................................................................43
15.16 Fence Assembly –Parts List................................................................................................................44
16.0 Electrical Connections for JPJ-12B, JPJ-12BHH.......................................................................................45
17.0 Optional Accessories .................................................................................................................................46

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3.0 Safety 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 woodworking Planer-Jointer 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 woodworking jointer or planer,
do not use until proper training and knowledge have been obtained.
5. Do not use this machine for other than its intended use. If used for other purposes, JET 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 shield while using this woodworking planer-jointer.
Note:Everyday eyeglasses only have impact resistant lenses; they are not safety glasses.
7. Before operating this woodworking planer-jointer, remove tie, rings, watches, and other jewelry, and roll
sleeves up past the elbows. Do not wear loose clothing. Confine long hair. Non-slip footwear or anti-skid
floor strips are recommended. Do not wear gloves.
8. Wear ear protectors (plugs or muffs) during extended periods of operation.
9. Do not operate this machine while tired or under the influence of drugs, alcohol, or any medication.
10. Make certain the switch is in the OFF position before connecting the machine to the power source.
11. Make certain the machine is properly grounded.
12. Make all machine adjustments or maintenance with the machine unplugged from the power source.
13. 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.
14. 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.
15. Make sure the planer-jointer is firmly secured to the floor or bench before use.
16. 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.
17. Provide for adequate space surrounding work area and non-glare, overhead lighting.
18. Keep the floor around the machine clean and free of scrap material, oil, and grease.
19. Keep visitors a safe distance from the work area. Keep children away.
20. Make your workshop child proof with padlocks, master switches or by removing starter keys.
21. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are
careless acts that can result in serious injury.
22. Maintain a balanced stance at all times so that you do not fall or lean against the cutterhead or other moving
parts. Do not overreach or use excessive force to perform any machine operation.
23. 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 more safely.
24. Use recommended accessories; improper accessories may be hazardous.
25. Maintain tools with care. Keep cutters sharp and clean for the best and safest performance. Follow
instructions for lubricating, and changing accessories.

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26. Make sure the workpiece is securely attached or clamped to the table. Never use your hand to hold the
workpiece.
27. Turn off the machine before cleaning. Use a brush or compressed air to remove chips or debris —do not
use your hands.
28. Do not stand on the machine. Serious injury could occur if the machine tips over.
29. Never leave the machine running unattended. Turn the power off and do not leave the machine until the
cutterhead comes to a complete stop.
30. Before turning on machine, remove all extra equipment such as keys, wrenches, scrap, stock, and cleaning
rags away from the machine.
Jointer Operation
31. Always use a hold-down or push block when surfacing stock less than 12" long, 3" wide, or 3" thick.
32. Do not perform jointing operations on material shorter than 8", narrower than 3/4", or less than 1/4" thick.
33. Hands must never be closer than 3" to the cutterhead (see the Figure
at right).
34. Never apply pressure to stock directly over the cutterhead. This may
result in the stock tipping into the cutterhead along with the operator's
fingers. Position hands away from extreme ends of stock, and push
through with a smooth, even motion. Never back workpiece toward the
infeed table.
35. To avoid kickback, the grain must run in the same direction you are cutting. Before attempting to joint or
plane, each workpiece must be carefully examined for stock condition and grain orientation.
36. When working with a swirl grain wood or burls, making it necessary to plane against the grain, use a lesser
depth of cut and a slow rate of feed.
37. Move the hands in an alternate motion from back to front as the work continues through the cut. Never pass
the hands directly over the cutter knife. As one hand approaches the knives, remove it from the stock in an
arc motion and place it back on the stock in a position beyond the cutter knife.
38. At all times hold the stock firmly against the table and fence.
Planer Operation
39. Keep hands outside the machine. NEVER reach under the guards to try to clear stock that stops feeding. Do
not clear chips and sawdust with hands; use a brush. Do not have any part of the hands under that part of
the board that is over the table when starting a cut; the infeed roll will engage the board and force it down
against the table causing a pinching action.
40. Check stock condition. Do not plane boards with loose knots or with nails or any foreign material on its
surface. Knife impact on these objects can cause the knives to be pulled out and cause them to shatter
against the chipbreaker or pressure bar. Twisted, warped, or in wind stock should first be jointed on one
surface before attempting to plane a parallel surface on the planer. Serious stock flaws cannot be removed
by use of a planer alone.
41. To avoid kickbacks, use this machine for single board surfacing only. Never make cuts deeper than 5/32"
(4mm).
WARNING: This product can expose you to chemicals including lead which is known to the State of
California to cause cancer and birth defects or other reproductive harm. For more information go to
http://www.p65warnings.ca.gov.
WARNING: Drilling, sawing, sanding, or machining wood products generates wood dust and other
substances known to the State of California to cause cancer. Avoid inhaling dust generated from wood products
or use a dust mask or other safeguards for personal protection.
Wood products emit chemicals known to the State of California to cause birth defects or other reproductive
harm. For more information go to http://www.p65warnings.ca.gov/wood.

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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.
4.0 Specifications
Model number ....................................................................... JPJ-12B................................................ JPJ-12BHH
Stock number..........................................................................715100.......................................................715155
Cutterhead speed (rpm)..............................................................5300...........................................................5300
Cutterhead diameter (in.) ............................................................2-3/4...........................................................2-3/4
Number of knives..............................................................................3.................................. 42 four-sided inserts
Knife size (LxWxT) (in.).....................................12-3/16 x 11/16 x 1/8...................................... 0.59 x 0.59 x 0.10
Dust port outside diameter (in.).........................................................4.................................................................4
Dust collection minimum (CFM)....................................................550.............................................................550
Jointer table size (LxW) (in.) ...........................................55 x 12-1/32...............................................55 x 12-1/32
Table height from floor (in.).......................................................33-1/2.........................................................33-1/2
Maximum stock removal (in.).........................................................1/8..............................................................1/8
Fence size (LxH) (in.)....................................................43-1/4 x 5-7/8.............................................43-1/4 x 5-7/8
Fence tilt.......................................................................... 90°to 45°R................................................90°to 45°R
Fence positive stop...................................................... 90°and 45°R.............................................90°and 45°R
Fence travel (in.) ...............................................................................6.................................................................6
Planer table size (LxW) (in.)............................................25 x 12-1/32...............................................25 x 12-1/32
Maximum workpiece thickness (in.) ............................................8-3/4...........................................................8-3/4
Maximum depth of cut (in.)...........................................................5/32............................................................5/32
Minimum length of workpiece (in.) ..................................................10...............................................................10
Feed rate (low speed / high speed) (fpm) ................................16 / 26........................................................16 / 26
Table movement per one handwheel revolution (in.)...................5/32............................................................5/32
Motor, TEFC...................................3HP, 1PH, 230V only, 60Hz, 15A.............. 3HP, 1PH, 230V only, 60Hz, 15A
Switch...............................................magnetic switch and limit switch................magnetic switch and limit switch
Power cord.............................................................14AWG 300V, 6 ft......................................14AWG 300V, 6 ft
Power cord plug ..............................................CSA 6-15P, 15A/250V............................... CSA 6-15P, 15A/250V
Overall dimensions (LxWxH) (in.) .................55-7/16 x 28-15/16 x 40.............................55-7/16 x 28-15/16 x 40
Stand footprint (LxW) (in.).................................................24 x 21-1/4.................................................24 x 21-1/4
Net weight (lb)...............................................................................453.............................................................453
The specifications in this manual are given as general information and are not binding. JET 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.
Read and understand the entire contents of this manual before attempting
assembly or operation! Failure to comply may cause serious injury!

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5.0 Features and Terminology
Figure 1
6.0 Receiving
Carefully unpack the machine and any loose
items from the wood case and inspect for
damage. Any damage should be reported
immediately to your distributor and shipping
agent. Before proceeding further, read your
manual thoroughly to familiarize yourself with
proper assembly, maintenance, and safety
procedures.
Remove the clear plastic protective sheets and
remove the protective coating from the tables and
cutterhead. This coating may be removed with a
soft cloth moistened with kerosene. Do not use
acetone, gasoline, or lacquer thinner for this
purpose. Do not use solvents on plastic parts.
Use care when cleaning the
cutterhead; the knives are very sharp.
7.0 Unpacking
1. Remove all contents from the shipping
carton. Do not discard the carton or packing
material until the machine is set up and
running satisfactorily.
2. Inspect the contents for shipping damage.
Report damage, if any, to your distributor.
This machine arrives fully assembled. However,
some tools may be needed for adjustments.
9.1 Contents of Shipping Container
1 Planer/Jointer
2 Push blocks
1 6mm hex wrench
1 Aluminum knife gauge (JPJ-12B only)
2 Star point screwdrivers (JPJ-12BHH only)
10 Knife inserts (JPJ-12BHH only)
10 Knife insert screws (JPJ-12BHH only)
1 Owner's manual
1 Warranty card
8.0 Electrical Connection
All electrical connections
must be done by a qualified electrician. All
adjustments or repairs must be done with the
machine disconnected from the power
source, unplugged. Failure to comply may
result in serious injury!
The model JPJ-12B and JPJ-12BHH Planer-
Jointer is rated at 230V. This machine is not
supplied with a plug. Use a plug and outlet rated
at least 30 amps. The circuit for the machine
should also be protected by at least a 30-amp
circuit breaker or fuse.
Make sure the cutterhead rotates in the proper
direction. If it does not, disconnect machine from
power supply and reverse two of the phase wires
on the supply input.

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9.0 Operating Controls
Disconnect machine from
power source before making any
adjustments. Failure to comply may cause
serious injury.
Cutterhead knives are
dangerously sharp. Use extreme caution
when working around them. Failure to comply
may cause serious injury.
9.1 Jointer to Planer Setup
Refer to Figures 2 and 3:
To change the machine configuration from jointer
to planer:
1. Release both cabinet table locks (A) by
rotating the handles toward the operator,
then pulling away from the machine.
2. Raise the table (C) using the handle (B).
When raised, the table should be in the
vertical position as shown in C, Fig. 3. The
latch (E) should be engaged, preventing the
table from an accidental forward fall.
Table is heavy. Use care when
raising. Failure to comply may cause serious
injury.
3. Position the dust chute (D) to the right (H).
Use extreme care to avoid contact with
cutterhead knives.
Note: The planer table may need to be lowered
to allow clearance needed to position the dust
chute.
Figure 2
9.2 Planer to Jointer Setup
Refer to Figures 2 and 3:
To change the machine configuration from planer
to jointer:
1. Pull the dust chute release knob (F) and
reposition the dust chute (D) to the left (G). It
should be positioned as shown in D, Fig. 2.
Note: The planer table may need to be lowered
to allow clearance needed to position the dust
chute.
2. Release the latch (E) and bring the table
forward using the handle (B). It should be
positioned as shown in C, Fig. 2.
Table is heavy. Use care when
lowering. Failure to comply may cause
serious injury.
3. Lock the table (C) by pushing the lock
handles (A) in toward the machine and
rotating down (away from the operator).
Figure 3

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9.3 Control Switch
Refer to Figure 4:
Press the green switch to start. Press the red
switch to stop.
To prevent unauthorized or accidental starting of
the machine, remove the safety key from the
green switch and store in a safe place. The key
must be reinserted to start the machine.
Figure 4
9.4 Planer Controls and Adjustments
Refer to Figure 5:
Table Height Adjustment
To set the planer table height, rotate the height
adjustment handwheel (E) counterclockwise to
raise the planer table (C), clockwise to lower.
Each revolution of the handwheel (E) results in a
5/32" up or down movement of the table (C). A
scale on the handwheel column indicates the
amount of handwheel rotation. A pointer (B)
indicates the table position relative to the
cutterhead on the scale (A) located on the side of
the cabinet.
Power Feed
The gearbox has two feed speeds. These are set
by pulling out or pushing in the shift lever (D).
Always change feed speed while the machine
is running. A diagram showing lever positions
and associated feed speeds can be found above
the gearbox cover. It is also shown in Figure 6.
Planer must be running when
changing the feed rate. Do not attempt to
change the feed speed while stock is passing
through the machine. Failure to comply may
damage the gearbox.
Figure 5
Figure 6
9.5 Jointer Controls and
Adjustments
Outfeed Table Height Adjustment
Refer to Figure 7:
The outfeed table lock handle (C) and outfeed
table adjustment handle (B) control the height
adjustment of the outfeed table (A).The outfeed
table is initially adjusted at the factory and should
not be repositioned except during certain
adjustments. These are described in sect. 10.2,
Table and Knife Adjustments.
Infeed Table Height Adjustment
Refer to Figure 7:
The infeed table lock handle (D) and infeed table
adjustment handle (E) control the height
adjustment of the infeed table (F).
To adjust:
1. Loosen the infeed table lock handle (D).
2. Raise infeed table adjustment handle (E) to
raise the infeed table (F) for a shallow depth
of cut. Lower the handle for a deeper cut.
3. Tighten the infeed table lock handle (D).
The infeed table adjustment handle in the fully
lowered position results in a depth of cut of 1/8".
Note: A depth of cut 1/16" or less is recom-
mended.

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Figure 7
Cutterhead Guard
Refer to Figure 8:
Properly positioned, the cutterhead guard (B)
should rest against the fence (A).
Fence Movement
Refer to Figure 8:
The fence (A) can be moved forward (C) or
backward (D) across half the width (W) of the
table, with 6" travel. It also tilts up to 45°
backwards (E) and has positive stops at 90° and
45°R.
When edge jointing, the fence assembly should
periodically be moved to different positions to
distribute wear on the cutterhead knives.
To Slide Fence Forward or Backward
Refer to Figure 8:
1. Loosen the assembly locking handle (H).
2. Move the entire fence assembly (G) to the
desired position.
3. Tighten the assembly locking handle (H).
To Tilt Fence Backward
Refer to Figure 8:
The fence (A) can be tilted backward (E) up to
45°; that is, for a total included angle of 135°from
table surface.
1. Loosen the tilt locking handle (F).
2. Flip the stop plate (I) out of the way.
3. Tilt the fence (A) back (E) to the desired
angle, up to 135°. Or place a beveled
reference piece on the table and against the
fence, adjusting the fence until the fence
angle matches the bevel of gauge piece.
4. Tighten the tilt locking handle (F).
Important: When the tilted operation is finished
and the fence is returned to 90°, make sure to flip
the stop plate (I) back to its original position.
Figure 8
10.0 Adjustments
10.1 Fence Stop Adjustments
Refer to Figure 9:
Periodically check the 90° and 45° backward
(135°) tilt accuracy of the fence with an angle
measuring device, such as an adjustable square
or machinist’s protractor.
90°Stop Fence Adjustment
The 90ºstop is controlled by the stop bolt (C) and
the stop plate (D).
1. Set the infeed table (F, Fig. 7) to approx-
imately the same height as the outfeed table
(A, Fig. 7).
2. Move the fence (A) by releasing the
assembly locking handle (F) and pushing the
fence assembly (E) until it overlaps the
tables. Then, tighten the assembly locking
handle (F).
3. Adjust the fence (A) to a 90º angle by
releasing tilt locking handle (G), pulling the
fence upright, and tightening the tilt locking
handle.
Note: The stop bolt (C) should be resting against
the stop plate (D).
4. Place an angle measuring device on the table
and against the fence (A) to confirm a 90º
setting.