Jet GH-1440ZX Troubleshooting guide

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Operation and Maintenance Instructions
ZX-Series Large Bore Lathes
Models GH-1440ZX
GH-1640ZX/1660ZX
GH-1860ZX/1880ZX
GH-2280ZX
Model GH-1440ZX shown
* For ZX-Series Lathes Parts List & Electrical Diagrams, see document M-321910-1
JET
427 New Sanford Road
LaVergne, TN 37086 Part No. M-321910
Ph.: 800-274-6848 Revision J2 08/2018
www.jettools.com Copyright © 2017 JET

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1.0 IMPORTANT SAFETY
INSTRUCTIONS
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 lathe 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 lathe, do not use until proper training
and knowledge have been obtained.
5. Do not use this lathe 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 shields
while using this lathe. Everyday eyeglasses only
have impact resistant lenses; they are not safety
glasses.
7. Before operating this lathe, 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. 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
supply.
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. 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.
16. Provide for adequate space surrounding work
area and non-glare, overhead lighting.
17. Keep the floor around the machine clean and
free of scrap material, oil and grease.
18. Keep visitors a safe distance from the work
area. Keep children away.
19. Make your workshop child proof with padlocks,
master switches or by removing starter keys.
20. Give your work undivided attention. Looking
around, carrying on a conversation and “horse-
play” are careless acts that can result in serious
injury.
21. Maintain a balanced stance at all times so that
you do not fall or lean against moving parts. Do
not overreach or use excessive force to perform
any machine operation. Never force the cutting
action.
22. 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.
23. Use recommended accessories; improper
accessories may be hazardous.
24. Maintain tools with care. Keep cutting tools
sharp and clean for the best and safest
performance. Follow instructions for lubricating
and changing accessories.
25. Do not attempt to adjust or remove tools during
operation.
26. Turn off the machine and disconnect from
power before cleaning. Use a brush to remove
shavings or debris — do not use your hands.
27. Do not stand on the machine. Serious injury
could occur if the machine tips over.
28. Never leave the machine running unattended.
Turn the power off and do not leave the
machine until it comes to a complete stop.
29. Remove loose items and unnecessary work
pieces from the area before starting the
machine.

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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.
2.0 Dimensions and mounting hole centers
Figure 1
WARNING: Some dust, fumes and gases
created by power sanding, sawing, grinding,
drilling, welding and other construction activities
contain chemicals known to the State of California
to cause cancer and 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 dust masks that are
specifically designed to filter out microscopic
particles. For more information go to
http://www.p65warnings.ca.gov/ and http://www.
p65warnings.ca.gov/wood.
WARNING: This product can expose you to
chemicals including lead and cadmium which are
known to the State of California to cause cancer
and phthalates which are known to the State of
California to cause birth defects or other
reproductive harm. For more information go to
http://www.p65warnings. ca.gov.

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3.0 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.
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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4.0 Table of Contents
1.0 IMPORTANT SAFETY INSTRUCTIONS.......................................................................................................2
2.0 Dimensions and mounting hole centers.........................................................................................................3
3.0 Warranty and service .....................................................................................................................................4
4.0 Table of Contents...........................................................................................................................................5
5.0 Specifications.................................................................................................................................................6
5.1 Specifications: 14-inch lathe.......................................................................................................................6
5.2 Specifications: 16-inch lathe.......................................................................................................................7
5.3 Specifications: 18-inch lathe.......................................................................................................................8
5.4 Specifications: 22-inch lathe.......................................................................................................................9
6.0 General Description and Nomenclature.......................................................................................................10
7.0 Unpacking....................................................................................................................................................12
7.1 Contents of shipping container.................................................................................................................12
8.0 Installation....................................................................................................................................................13
8.1 Leveling the lathe.....................................................................................................................................13
8.2 Completing installation.............................................................................................................................13
8.3 Chuck preparation (three-jaw)..................................................................................................................14
8.4 Break-in period.........................................................................................................................................14
9.0 Maintenance/Lubrication ...............................................................................................................................15
10.0 Coolant preparation....................................................................................................................................16
11.0 Electrical connections ................................................................................................................................16
11.1 Conversion to 460 volt operation .............................................................................................................17
12.0 Controls......................................................................................................................................................17
13.0 Operation ...................................................................................................................................................19
13.1 Tool setup...............................................................................................................................................20
13.2 Feed and thread selection......................................................................................................................20
13.3 Thread cutting ........................................................................................................................................20
14.0 Adjustments ...............................................................................................................................................20
14.1 Chuck jaw reversal.................................................................................................................................20
14.2 Gib adjustments .....................................................................................................................................21
14.3 Tailstock off-set......................................................................................................................................21
14.4 Removing gap bridge.............................................................................................................................21
14.5 Installing gap bridge...............................................................................................................................22
14.6 Belt replacement/adjustment..................................................................................................................22
14.7 Aligning tailstock to headstock...............................................................................................................22
14.8 Cross slide nut adjustment.....................................................................................................................22
14.9 Shear pin replacement...........................................................................................................................22
14.10 Steady rest adjustment.........................................................................................................................22
14.11 Follow rest adjustment .........................................................................................................................23
14.12 Carriage stops......................................................................................................................................23
15.0 Lubrication schedule and general maintenance.........................................................................................24
16.0 Reference tables........................................................................................................................................25
16.1 Inch Lead And Feed...............................................................................................................................25

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Specifications were current at the time this manual was published, but because of our policy of continuous
improvement, JET reserves the right to change specifications at any time and without prior notice, without
incurring obligations.
5.0 Specifications
5.1 Specifications: 14-inch lathe
Model Number......................................................................................................................................GH-1440ZX
Stock Number .............................................................................................................................................321910
Capacities:
Swing over Bed (in.)............................................................................................................................................14
Swing over Cross Slide (in.)............................................................................................................................7-5/8
Swing Through Gap (in.)...............................................................................................................................23-5/8
Length of Gap (in.)..............................................................................................................................................12
Distance between Centers (in.)...........................................................................................................................40
Headstock:
Spindle Bore (in.) ............................................................................................................................................3-1/8
Spindle Mount................................................................................................................................................. D1-8
Spindle Taper with Sleeve ...................................................................................................................MT-7(MT-5)
Number of Spindle Speeds.................................................................................................................................12
Range of Spindle Speeds (RPM)...........................................................................................................42 to 1800
Gearbox:
Number of Longitudinal and Cross Feeds......................................................................................................46/31
Range of Longitudinal Feeds (in./rev.).........................................................................................0.0015 to 0.0900
Range of Cross Feeds (in./rev.)...................................................................................................0.0010 to 0.0360
Number of Inch Threads .....................................................................................................................................61
Range of Inch Threads (in.) ...................................................................................................................1-5/8 to 72
Number of Metric Threads ..................................................................................................................................24
Range of Metric Threads (mm) ............................................................................................................0.50 to 20.0
Number of Diametral Threads.............................................................................................................................45
Range of Diametral Threads .............................................................................................................3-1/4 – 96DP
Number of Module Threads ...............................................................................................................................20
Range of Module Threads ..................................................................................................................0.25 – 10MP
Compound and Carriage:
Maximum Compound Slide Travel (in.)...........................................................................................................5-1/8
Maximum Cross Slide Travel (in.).........................................................................................................................9
Carriage Travel (in.) ............................................................................................................................................36
Tailstock:
Tailstock Spindle Travel (in.).................................................................................................................................6
Tailstock Taper................................................................................................................................................MT-4
Steady Rest Capacity (in.) ..........................................................................................................................3/8 to 7
Follow Rest Capacity (in.).....................................................................................................................1/2 to 3-1/2
Width of Bed (in.) ..........................................................................................................................................13-1/8
Overall Dimensions (in.)(LxWxH)................................................................................91-5/16 x 41-5/16 x 50-5/16
Motor.....................................................................................................7-1/2HP, 3PH, 230/460V (prewired 230V)
Approximate Net Weight (lbs.)........................................................................................................................4667

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5.2 Specifications: 16-inch lathe
Model Number............................................................................... GH-1640ZX...................................GH-1660ZX
Stock Number .......................................................................................321930..........................................321940
Capacities:
Swing over Bed (in.)......................................................................................16..................................................16
Swing over Cross Slide (in.)..........................................................................10..................................................10
Swing Through Gap (in.)...............................................................................25..................................................25
Length of Gap (in.)........................................................................................12..................................................12
Distance between Centers (in.).....................................................................40..................................................60
Headstock:
Spindle Bore (in.) ..................................................................................... 3-1/8..............................................3-1/8
Spindle Mount...........................................................................................D1-8.............................................. D1-8
Spindle Taper with Sleeve ............................................................ MT-7(MT-5)...................................MT-7(MT-5)
Number of Spindle Speeds...........................................................................12..................................................12
Range of Spindle Speeds (RPM).....................................................25 to 1800.....................................25 to 1800
Gearbox:
Number of Longitudinal and Cross Feeds................................................46/31.............................................46/31
Range of Longitudinal Feeds (in./rev.)...................................0.0015 to 0.0900...........................0.0015 to 0.0900
Range of Cross Feeds (in./rev.).............................................0.0010 to 0.0360...........................0.0010 to 0.0360
Number of Inch Threads ...............................................................................61..................................................61
Range of Inch Threads (in.) ............................................................ 1-5/8 to 72.....................................1-5/8 to 72
Number of Metric Threads ............................................................................24..................................................24
Range of Metric Threads (mm) ......................................................0.50 to 20.0...................................0.50 to 20.0
Number of Diametral Threads.......................................................................45..................................................45
Range of Diametral Threads....................................................... 3-1/4 – 96DP.................................3-1/4 – 96DP
Number of Module Threads ..........................................................................20..................................................20
Range of Module Threads............................................................0.25 – 10MP..................................0.25 – 10MP
Compound and Carriage:
Maximum Compound Slide Travel (in.).................................................... 5-1/8..............................................5-1/8
Maximum Cross Slide Travel (in.)...................................................................9....................................................9
Carriage Travel (in.) ......................................................................................36..................................................55
Tailstock:
Tailstock Spindle Travel (in.)...........................................................................6....................................................6
Tailstock Taper.........................................................................................MT-4..............................................MT-4
Steady Rest Capacity (in.) ....................................................................3/8 to 7..........................................3/8 to 7
Follow Rest Capacity (in.).............................................................. 1/2 to 3-1/2....................................1/2 to 3-1/2
Width of Bed (in.) ................................................................................... 13-1/8............................................13-1/8
Overall Dimensions (in.)(LxWxH)..........................91-5/16 x 41-5/16 x 50-5/8.......... 111-3/8 x 41-5/16 x 50-5/8
Motor........................................................................7-1/2HP, 3Ph, 230/460V*..............7-1/2HP, 3Ph, 230/460V*
Approximate Net Weight (lbs.)..................................................................4689..............................................5218
*pre-wired 230V

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5.3 Specifications: 18-inch lathe
Model Number............................................................................... GH-1860ZX...................................GH-1880ZX
Stock Number .......................................................................................321960..........................................321970
Capacities:
Swing over Bed (in.)......................................................................................18..................................................18
Swing over Cross Slide (in.)..........................................................................11..................................................11
Swing Through Gap (in.)...............................................................................27..................................................27
Length of Gap (in.)........................................................................................12..................................................12
Distance between Centers (in.).....................................................................60..................................................80
Headstock:
Spindle Bore (in.) ..................................................................................... 3-1/8..............................................3-1/8
Spindle Mount...........................................................................................D1-8.............................................. D1-8
Spindle Taper with Sleeve ............................................................ MT-7(MT-5)...................................MT-7(MT-5)
Number of Spindle Speeds...........................................................................12..................................................12
Range of Spindle Speeds (RPM).....................................................25 to 1800.....................................25 to 1800
Gearbox:
Number of Longitudinal and Cross Feeds................................................46/31.............................................46/31
Range of Longitudinal Feeds (in./rev.)...................................0.0015 to 0.0900...........................0.0015 to 0.0900
Range of Cross Feeds (in./rev.).............................................0.0010 to 0.0360...........................0.0010 to 0.0360
Number of Inch Threads ...............................................................................61..................................................61
Range of Inch Threads (in.) ............................................................ 1-5/8 to 72.....................................1-5/8 to 72
Number of Metric Threads ............................................................................24..................................................24
Range of Metric Threads (mm) ......................................................0.50 to 20.0...................................0.50 to 20.0
Number of Diametral Threads.......................................................................45..................................................45
Range of Diametral Threads....................................................... 3-1/4 – 96DP.................................3-1/4 – 96DP
Number of Module Threads ..........................................................................20..................................................20
Range of Module Threads............................................................0.25 – 10MP..................................0.25 – 10MP
Compound and Carriage:
Maximum Compound Slide Travel (in.).................................................... 5-1/8..............................................5-1/8
Maximum Cross Slide Travel (in.)...................................................................9....................................................9
Carriage Travel (in.) ......................................................................................55..................................................74
Tailstock:
Tailstock Spindle Travel (in.)...........................................................................6....................................................6
Tailstock Taper.........................................................................................MT-5..............................................MT-5
Steady Rest Capacity (in.) ............................................................. 3/8 to 7-3/4....................................3/8 to 7-3/4
Follow Rest Capacity (in.).............................................................. 1/2 to 3-1/2....................................1/2 to 3-1/2
Width of Bed (in.) ................................................................................... 13-1/8............................................13-1/8
Overall Dimensions (in.)(LxWxH)........................111-3/8 x 41-5/16 x 51-7/8.........130-5/8 x 41-5/16 x 51-7/8
Motor........................................................................7-1/2HP, 3PH, 230/460V*.............7-1/2HP, 3PH, 230/460V*
Approximate Net Weight (lbs.)..................................................................5320..............................................5949
*pre-wired 230V

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5.4 Specifications: 22-inch lathe
Model Number......................................................................................................................................GH-2280ZX
Stock Number .............................................................................................................................................321980
Capacities:
Swing over Bed (in.)............................................................................................................................................22
Swing over Cross Slide (in.)................................................................................................................................13
Swing Through Gap (in.).....................................................................................................................................29
Length of Gap (in.)..............................................................................................................................................12
Distance between Centers (in.)...........................................................................................................................80
Headstock:
Spindle Bore (in.) ............................................................................................................................................3-1/8
Spindle Mount................................................................................................................................................. D1-8
Spindle Taper with Sleeve ...................................................................................................................MT-7(MT-5)
Number of Spindle Speeds.................................................................................................................................12
Range of Spindle Speeds (RPM)...........................................................................................................25 to 1800
Gearbox:
Number of Longitudinal and Cross Feeds......................................................................................................46/31
Range of Longitudinal Feeds (in./rev.).........................................................................................0.0015 to 0.0900
Range of Cross Feeds (in./rev.)...................................................................................................0.0010 to 0.0360
Number of Inch Threads .....................................................................................................................................61
Range of Inch Threads (in.) ...................................................................................................................1-5/8 to 72
Number of Metric Threads ..................................................................................................................................24
Range of Metric Threads (mm).............................................................................................................0.50to 20.0
Number of Diametral Threads.............................................................................................................................45
Range of Diametral Threads .............................................................................................................3-1/4 – 96DP
Number of Module Threads ...............................................................................................................................20
Range of Module Threads ..................................................................................................................0.25 – 10MP
Compound and Carriage:
Maximum Compound Slide Travel (in.)...........................................................................................................5-1/8
Maximum Cross Slide Travel (in.).......................................................................................................................12
Carriage Travel (in.) ............................................................................................................................................74
Tailstock:
Tailstock Spindle Travel (in.).................................................................................................................................6
Tailstock Taper................................................................................................................................................MT-5
Steady Rest Capacity (in.) ....................................................................................................................3/8 to 7-3/4
Follow Rest Capacity (in.).....................................................................................................................1/2 to 3-1/2
Width of Bed (in.) ..........................................................................................................................................13-1/8
Overall Dimensions (in.)(LxWxH).............................................................................130-5/8 x 42-5/16 x 53-5/16
Motor..................................................................................................... 10HP, 3PH, 230V/460V (pre-wired 230V)
Approximate Net Weight (lbs.)........................................................................................................................6421

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6.0 General Description and Nomenclature
Figure 2 – General Description of ZX Lathes
Bed and stand
The lathe bed (A) is made of cast iron with low
vibration and high rigidity. Two precision-ground v-
slideways (B), reinforced by supersonic frequency
hardening, offer precision guidance for the
carriage. The main drive motor is mounted in the
stand (C) below the gearbox.
Headstock
The headstock (D) is cast from high grade, low
vibration cast iron. In the head, the spindle is
mounted in precision taper roller bearings. See
section 12.0 for detailed explanation of controls.
The electrical box is mounted to the rear of the
headstock.
A 3-Jaw scroll chuck (E) is included.
Feed gearbox
The gearbox (F) is made from high quality cast iron
and is mounted to the left side of the machine bed.
Carriage
The carriage assembly is composed of the Apron,
the Saddle, the Cross Slide, the Compound Rest,
and the four-way Tool Post.
Apron (G). Quick travel of the Apron for
positioning is accomplished by means of a bed-
mounted rack and pinion, operated manually by
the handwheel on the front of the apron, or
automatically by the feed direction handle.
Saddle (H). The saddle is made from high
quality cast iron and rides along the v-ways.
Cross Slide (I). The cross-slide is mounted on
the saddle and used for cross feed operations. It
moves on a dovetailed slide which can be
adjusted for play by means of the gibs.
Compound Rest (J). The compound rest, which
is T-slotted and mounted on the cross slide, can
be rotated 360°, allowing tapers to be turned.
The compound rest travels on dovetailed ways,
with adjustable gibs.