Jet ZH Series Troubleshooting guide

Operation and Maintenance Instructions
ZH Series Large Bore Lathes
Models GH-2680ZH; GH-26120ZH
Model GH-2680ZH shown
For ZH-Series Lathes Parts List and Electrical Diagrams, see document M-321860-1
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086 Part No. M-321860
Ph.: 800-274-6848 Revision A 11/2011
www.jettools.com Copyright © 2011 Walter Meier (Manufacturing) Inc.
This .pdf document is bookmarked

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1.0 Warranty and Service
Walter Meier (Manufacturing) 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 Walter Meier 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
Walter Meier is consistently adding new products to the line. For complete, up-to-date product information, check with
your local Walter Meier distributor, or visit waltermeier.com.
WARRANTY
JET products carry a limited warranty which varies in duration based upon the product (MW = Metalworking, WW =
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 Warranties do not cover woodworking (WW) products used for commercial, industrial or educational
purposes. Woodworking products with Five Year 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
WALTER MEIER (MANUFACTURING) INC., 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.
WALTER MEIER 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.
Walter Meier sells through distributors only. The specifications in Walter Meier catalogs are given as general
information and are not binding. Members of Walter Meier 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 Walter Meier.

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2.0 Table of Contents
1.0 Warranty and Service .......................................................................................................................2
2.0 Table of Contents .............................................................................................................................3
3.0 Safety warnings................................................................................................................................4
4.0 Specifications...................................................................................................................................6
5.0 Dimensions and mounting hole centers.............................................................................................8
6.0 General description and nomenclature..............................................................................................9
7.0 Unpacking......................................................................................................................................11
Contents of the Shipping Container....................................................................................................11
8.0 Installation......................................................................................................................................12
8.1 Leveling the lathe........................................................................................................................12
8.2 Completing installation................................................................................................................12
8.3 Chuck Preparation.......................................................................................................................13
8.4 Break-In Period...........................................................................................................................13
9.0 Maintenance/Lubrication ..................................................................................................................14
9.1 Coolant Preparation ....................................................................................................................16
10.0 Electrical Connections...................................................................................................................16
10.1 Conversion to 460 Volt Operation ...............................................................................................17
11.0 Basic Controls ..............................................................................................................................18
12.0 Operation......................................................................................................................................21
12.1 Tool Setup.................................................................................................................................21
12.2 Spindle Speed...........................................................................................................................22
12.3 Feed and Thread Selection .......................................................................................................22
12.4 Thread Cutting ..........................................................................................................................22
13.0 Adjustments..................................................................................................................................23
13.1 Chuck Jaw Reversal..................................................................................................................23
13.2 Gib Adjustments........................................................................................................................23
13.3 Tailstock Adjustments................................................................................................................24
13.4 Gap Section..............................................................................................................................24
13.5 Belt Adjustment and Replacement ...............................................................................................24
13.6 Brake Strap...............................................................................................................................25
13.7 Friction Clutch Adjustment.........................................................................................................25
13.8 Aligning Tailstock to Headstock.................................................................................................26
13.9 Spindle Bearings.......................................................................................................................26
13.10 Speed Control.........................................................................................................................26
13.11 Lead Screw.............................................................................................................................26
13.12 Apron Feed Clutch ..................................................................................................................27
13.13 Tool Post.................................................................................................................................27
13.14 Cross Slide Nut Adjustment.....................................................................................................27
13.15 Shear Pin Replacement...........................................................................................................28
13.16 Steady Rest Adjustment..........................................................................................................28
13.17 Follow Rest Adjustment...........................................................................................................28
14.0 Troubleshooting the ZH Series Lathes ..........................................................................................29
15.0 Lubrication Schedule and General Maintenance............................................................................30
16.0 Reference Tables .........................................................................................................................31
16.1 Inch Lead And Feed..................................................................................................................31
16.2 Special Inch Lead And Feed......................................................................................................31
16.3 Speed Selection Lever Positions ...............................................................................................32
17.0 Electrical – 230 volt to 460 volt Conversion...................................................................................32
18.0 Change Gear Diagram.................................................................................................................. 33

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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 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, Walter Meier (Manufacturing)
Inc., 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. Some dust created by power sanding, sawing, grinding, drilling and other construction activities contain
chemicals known to the state of California to cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:
•Lead from lead based 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 after maintenance is complete.
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.

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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 moving parts. Do not overreach or
use excessive force to perform any machine operation. Never force the cutting action.
23. 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.
24. 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.
25. Use recommended accessories; improper accessories may be hazardous.
26. Maintain tools with care. Keep cutting tools sharp and clean for the best and safest performance. Follow
instructions for lubricating and changing accessories.
27. Do not attempt to adjust or remove tools during operation.
28. Never stop a rotating chuck or workpiece with your hands.
29. Choose a low spindle speed when working unbalanced workpieces, and for threading and tapping operations.
30. Do not exceed the maximum speed of the workholding device.
31. Do not exceed the clamping capacity of the chuck.
32. Workpieces longer than 3 times the chucking diameter must be supported by the tailstock or a steady rest.
33. Avoid small chuck diameters with large turning diameters.
34. Avoid short chucking lengths and small chucking contact.
35. Turn off the machine and disconnect from power before cleaning. Use a brush to remove shavings or debris —
do not use your hands.
36. Do not stand on the machine. Serious injury could occur if the machine tips over.
37. Never leave the machine running unattended. Turn the power off and do not leave the machine until moving
parts come to a complete stop.
38. Remove loose items and unnecessary work pieces from the area before starting the machine.
39. Do not operate the lathe in flammable or explosive environments. Do not use in a damp environment or expose
to rain.
Familiarize yourself with the following safety notices used in thismanual:
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.

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4.0 Specifications
Model Number............................................................................GH-2680ZH.......................................GH-26120ZH
Stock Number....................................................................................321860................................................321890
General Capacities:
Maximum Swing over Bed.....................................................26” (660 mm).......................................26” (660 mm)
Maximum Swing over Cross Slide....................................16-1/2” (420 mm).................................16-1/2” (420 mm)
Maximum Swing Through Gap...............................................34” (870 mm).......................................34” (870 mm)
Length of Gap.................................................................8-1/32” (204 mm).................................8-1/32” (204 mm)
Distance between Centers...................................................80” (2030 mm)...................................120” (3050 mm)
Width of Bed..........................................................................16” (405mm)........................................16” (405mm)
Motors and Electrical:
Main Motor.........................................................................TEFC Induction................................... TEFC Induction
Horsepower....................................................................10 HP (7.5kW).....................................10 HP (7.5kW)
Phase...........................................................................................3 PH....................................................3 PH
Voltage..........................................................230/460V (prewired 230V)................... 230/460V (prewired 230V)
Full Load Amps....................................................................25.4/12.7A...........................................25.4/12.7A
Cycle............................................................................................60 Hz..................................................60 Hz
Feed Motor..................................................................................Induction.............................................Induction
Horsepower................................................................................1/2 HP.................................................1/2 HP
Phase...........................................................................................3 PH....................................................3 PH
Voltage..........................................................230/460V (prewired 230V)...................230/460V (prewired 230V)
Full Load Amps....................................................................2.85/1.65A...........................................2.85/1.65A
Cycle............................................................................................60 Hz..................................................60 Hz
Coolant Pump Motor.....................................................................Induction............................................. Induction
Horsepower................................................................................1/8 HP.................................................1/8 HP
Phase...........................................................................................3 PH....................................................3 PH
Voltage..........................................................230/460V (prewired 230V)...................230/460V (prewired 230V)
Full Load Amps....................................................................0.54/0.27A...........................................0.54/0.27A
Cycle............................................................................................60 Hz..................................................60 Hz
Power Transmission.................................................................. v-belt (x 4)...........................................v-belt (x 4)
Controls circuit...........................................................................110V A.C.............................................110V A.C.
Lamp circuit .................................................................................24V A.C. ............................................ 24V A.C.
Indicators circuit.........................................................................110V A.C.............................................110V A.C.
Headstock and Spindle:
Spindle Bore.....................................................................4-1/8” (105 mm)...................................
4-1/8” (105 mm)
Spindle Mount......................................................................D1-8 Camlock..................................... D1-8 Camlock
Spindle Taper with Sleeve.....................................113mm Dia. 1:20/ MT-5...................... 113mm Dia. 1:20 / MT-5
Number of Spindle Speeds.....................................................................12....................................................... 12
Range of Spindle Speeds..................................................36 to 1600 RPM.................................. 36 to 1600 RPM
Distance Floor to Spindle Center (approx.).......................................46-1/2”................................................ 46-1/2”
3-Jaw Scroll Chuck:
Load Capacity............................................................... 661 lb(300 kg).................................... 661 lb (300 kg)
Inside Diameter............................................................4-1/8” (105 mm)...................................4-1/8” (105 mm)
4-Jaw Independent Chuck:
Load Capacity...........................................................1476 lb (669.5 kg)................................1476 lb (669.5 kg)
Inside Diameter............................................................4-7/8” (124 mm)...................................4-7/8” (124 mm)
Carriage:
Maximum Tool Size................................1-1/4” x 1-1/4” (31.75 x 31.75 mm).......1-1/4” x 1-1/4” (31.75 x 31.75mm)
Maximum Compound Rest Travel......................................5-1/2” (140 mm)...................................5-1/2” (140 mm)
Maximum Compound Rest Swivel..............................................+/- 90 deg............................................+/- 90 deg.
Maximum Cross Slide Travel......................................... 14-9/16” (370 mm)...............................14-9/16” (370 mm)
Maximum Carriage Travel...............................................68-7/8” (1750mm)...........................108-9/32” (2750 mm)

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GH-2680ZH GH-26120ZH
Gearbox:
Number of Longitudinal Feeds................................................................65....................................................... 65
Range of Longitudinal Feeds..0.0023 – 0.0937 in./rev. (0.063-2.52 mm/rev)........0.0023 – 0.0937 (0.063-2.52 mm)
Number of Cross Feeds..........................................................................63....................................................... 63
Range of Cross Feeds ............0.0010 – 0.0404 in/rev. (0.027-1.07 mm/rev)..........0.0010 – 0.404 (0.027-1.07 mm)
Number of Inch Threads.........................................................................48....................................................... 48
Range of Inch Threads...............................................................30-2 T.P.I.............................................30-2 T.P.I
Number of Metric Threads......................................................................22....................................................... 22
Range of Metric Threads ..............................................................1-14 mm..............................................1-14 mm
Number of Diametral Threads.................................................................24.......................................................24
Range of Diametral Threads........................................................56-4 D.P..............................................56-4 D.P.
Number of Modular Threads...................................................................18....................................................... 18
Range of Modular Threads..........................................................0.5-7 mm.............................................0.5-7 mm
Leadscrew Pitch..................................................................1/2” (12.7 mm).....................................1/2” (12.7 mm)
Tailstock:
Tailstock Spindle Travel ..........................................................6” (150 mm).........................................6” (150 mm)
Tailstock Taper.................................................................................. MT-5 ..................................................MT-5
Maximum Tailstock Cross Displacement..........................+/- 0.40” (10 mm).................................+/- 0.40” (10 mm)
Other:
Small Steady Rest Capacity......................................3/4” – 5” (20-125 mm)..........................3/4” – 5” (20-125 mm)
Large Steady Rest Capacity................................... 4” – 9.5” (100-240 mm)........................4” – 9.5” (100-240 mm)
Follow Rest Capacity................................................3/4” – 4” (20-100 mm)..........................3/4” – 4” (20-100 mm)
Coolant tank capacity...............................................................4 gal. (15L)..........................................4 gal. (15L)
Noise emission (idling at max. speed)
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...........................................82.4 dB............................................... 82.4 dB
Overall Dimensions.............................137-13/16”L x 53-5/32”W x 55-1/2”H........177-5/32”L x 47-1/4”W x 55-1/2”H
(3500 x 1350 x 1410 mm) (4500 x 1200 x 1410 mm)
Approximate Net Weight...............................................8532 lbs. (3870 kg)..............................9369 lbs. (4250 kg)
1
Values are emission levels, not necessarily to be seen as safe operating levels. Since workplace conditions vary,
this information is only intended to allow the user to make a better estimation of the hazards involved.
The specifications in this manual were current at time of publication, but because of our policy of continuous
improvement, Walter Meier (Manufacturing) Inc., reserves the right to change specifications at any time and without
prior notice, without incurring obligations.

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5.0 Dimensions and mounting hole centers
Figure 1
Lathe Size 80 inch
(GH-2680ZH) 120 inch (GH-26120ZH)
A 2560mm (100.8 in.) 3565mm (140.4 in.)
B 3495mm (137.60 in. ) 4500mm (177.2 in.)
C 1721.5mm (67.8 in)
Table 1

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6.0 General description and nomenclature
Figure 2 – General Description (GH-2680ZH shown)
The ZH series lathe operates on a centralized
gear system. The motor power is transferred
through four v-belts to a shaft, which in turn
transmits the energy through a multi-disc friction
clutch and various gear pairs, to the spindle. The
clutch also controls the spindle’s direction of
rotation. Through clutch disengagement, the
operator can stop the spindle without turning off
the motor, which will prolong the life of the
motor.
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 fre-
quency hardening, offer precision guidance for
the carriage. The main drive motor is mounted in
the stand (C) below the gearbox.
(The GH-26120ZH model has three stands: left,
center, and right).
Headstock
The headstock (D) is cast from high grade, low
vibration cast iron. In the head, the spindle is
supported at three points; by a cylindrical roller
bearing at the front and a tapered roller bearing
and ball bearing. See section 11.0 for detailed
explanation of controls. The electrical box is
mounted to the rear of the headstock.
Feed Gearbox
The gearbox (E) is made from high quality cast
iron and is mounted to the left side of the
machine bed. This lathe adopts a three-axle
sliding common gear mechanism, together with
thread selection change mechanism, and
doubling mechanism, which enable it to cut a
comprehensive range of metric, modular and
diametral pitch threads, thus eliminating the
need for gear changes except where special
threading is required.
Carriage
The carriage assembly is composed of the
Apron, the Saddle, the Cross Slide, the
Compound Rest, and the four-way Tool Post.
Apron (F). 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 (P), which has a rapid traverse (Q).
Saddle (G). The saddle is made from high
quality cast iron and rides along the v-ways.

10
Cross Slide (H). 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. The compound rest (I),
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.
Four-Way Tool Post. The tool post (J) is a
turret design, mounted to the compound rest.
It holds up to four tools simultaneously, and
includes an indexing function.
Tailstock
The tailstock (K) slides on a v-way and can be
locked at any location by a clamping lever. The
tailstock has a heavy duty quill with a No. 5
Morse Taper and etched graduation scale. The
tailstock can be offset for taper cutting, and
bearings can be adjusted for drag along the
ways.
Leadscrew and Feed Rod
The leadscrew (L) and feed rod (M) are mounted
on the front of the machine bed. They are
connected to the gearbox at the left and are
supported by bearings on both ends.
The leadscrew is used only for threading
functions. This maintains its accuracy and
prolonged service life.
Spindle Direction Control Axle (N)
Spindle rotation can be reversed by simply
moving the control lever (O) mounted at the right
of the carriage. (Allow spindle to come to a stop
before reversing.)
Travel Stops
Six stops (R) can be moved to any position
along the travel setting rod, and are secured in
place using socket head screws. The convex
surface of the stop contacts a limit switch on the
underside of the apron. The travel setting rod
can be rotated on an eccentric into six positions
to modulate the contact between stops and limit
switch.
A carriage stop (S) is also provided for manual
carriage operation.
Steady Rest
The ZH series lathes are provided with small
and large steady rests (T). A steady rest serves
as a support for shafts on the free tailstock end.
The steady rest is mounted on the bedway and
secured from below with a bolt, nut and locking
plate.
Follow Rest
The traveling follow rest (U) is mounted to the
saddle, and thus follows the movement of the
turning tool. Only two fingers are required as the
place of the third is taken by the turning tool.
The follow rest is used for turning operations on
long, slender work pieces. It prevents the work
piece from flexing under the pressure of the
cutting tool.
Work Lamp
Adjustable halogen lamp (V) with independent
on/off switch.
Coolant Nozzle (W)
Fully adjustable gooseneck; flow is regulated
through a valve lever at its base.
Foot Brake (X)
Activates a braking strap at the motor for
emergency stopping of all lathe functions.
Chuck Guard (Y)

11
7.0 Unpacking
Open shipping container and check for shipping
damage. Report any damage immediately to
your distributor and shipping agent. Do not
discard any shipping material until the Lathe is
set up and running properly.
Compare the contents of your container with the
following parts list to make sure all parts are
intact. Missing parts, if any, should be reported
to your distributor. Read the instruction manual
thoroughly for set up, maintenance and safety
instructions.
Contents of the Shipping Container
(Refer to Figure 3)
1 Lathe
2 Steady Rests (mounted on Lathe)
1 Follow Rest (mounted on Lathe)
1 Three Jaw Scroll Chuck, 12-25/32”
(mounted on Lathe) – A
1 Drive Plate – B
1 Four Jaw Independent Chuck, 15-23/32” – C
1 Face Plate, 24-25/32” (with 6 dogs) – D
1 Round Nut Spanner, 170-210 mm – E
4 Change Gears – 63T, 69T, 78T, 90T – F
1 Tool Box, containing the following:
1 Morse Reduction Sleeve – G
1 Live Center, MT-5 – H
1 Dead Center, MT-5 – I
2 Drive Pins – J
1 Cam Wrench – K
1 Chuck Wrench – L
1 Tool Post Wrench – M
1 Gap Bridge Pin Driver – N
1 Drift Key – O
1 Round Nut Spanner (45-52 mm) – P
1 Hex Key Set (6,8,10,12 mm) – Q
3 Fuses (2A,3A,4A) – R
6 Leveling Bolts with Hex Nuts – S
(qty. 8 for GH-26120ZH)
6 Leveling Pads – T
(qty. 8 for GH-26120ZH)
1 Flat Blade Screwdriver – U
1 Cross Point Screwdriver – V
2 Open End Wrenches (17/19,19/22) – W
1 White Touch-up Paint Can – X
1 Oil Gun – Y
1 Operating Instructions Manual
1 Parts List Manual
1 Warranty Card
1 Test Record
1 Packing List
NOTE: Optional accessories are available for JET Lathes, such as Taper Attachment, Collet Closer and
Digital Read Out. Contact your dealer or Walter Meier (Manufacturing) Inc., for more information.
Figure 3
ZH Series Lathes – Contents of Shipping Container

8.0 Installation
1. Finish removing all crate material from
around lathe.
2. Unbolt lathe from shipping pallet.
3. Choose a location for the lathe that is dry
and has sufficient illumination.
4. Allow enough room to service the lathe on
all four sides, and to load and off-load work
pieces. In addition, if bar work is to be
performed, allow enough space for stock to
extend out the headstock end. If used in
production operations, leave enough space
for stacking unfinished and finished parts.
5. The foundation must be solid to support the
weight of the machine and prevent vibration,
preferably a solid concrete floor.
6. The lathe’s center of weight is near the
headstock. Before lifting, move the tailstock
and the carriage (release carriage lock,
section 11.0) to the right end of the bed and
lock them.
7. Sling the lathe using steel rods or pipes of
sufficient strength inserted through the holes
in the stand (see Figure 4). Do not lift lathe
by the spindle. With properly rated lifting
equipment, slowly raise the lathe off the
shipping pallet.
Figure 4 – Lifting preparation
Confirm that all suspension
equipment is properly rated and in good
condition for lifting the lathe. Do not allow
anyone beneath or near the load while lifting.
8. The lathe can be placed upon the cast iron
leveling pads under each foot hole, and
adjusted using the adjusting bolts with hex
nuts. Or, it may be secured to the floor using
bolts placed head-down in the concrete, and
using shims where needed to level the
machine.
8.1 Leveling the lathe
It is imperative that the lathe be on a level plane;
that is, where headstock and tailstock center
points remain aligned throughout the tailstock
travel, with the bed ways absent of twist and
thus parallel to the operational center line.
A lathe which is not properly leveled will be
inaccurate, producing tapered cuts. Also, the
center point of the tailstock will vary as it is
positioned along the bed, thus requiring constant
readjustment of the set of the tailstock.
Figure 5 – Leveling
9. Use a machinist’s precision level on the bed
ways both front to back and side to side, as
shown in Figure 5. Take the reading in one
direction every 10 inches. Make sure the
ways are clean and free of any debris before
placing a level upon them.
10. Deviation over bed length (see Figure 5):
(a) Maximum 0.02/1000mm
(b) Maximum 0.04/1000mm
11. Tighten foot screw nuts evenly to avoid
distortion.
12. Leveling should be inspected occasionally,
and especially if the accuracy of the lathe
beings to diminish.
8.2 Completing installation
13. Exposed metal surfaces have been coated
with a rust protectant. Remove this using a
soft rag and mild commercial solvent or
kerosene. Do not use paint thinner,
gasoline, or lacquer thinner, as these will
damage painted surfaces. Cover all cleaned
surfaces with a light film of ISO68/SAE-20W
machine oil, such as Mobil DTE Oil Heavy
Medium.
14. Open the end gear cover. Clean all
components of the end gear assembly and
coat all gears with a heavy, non-slinging
grease. Close the end gear cover. (Note: A
limit switch prevents the lathe from operating
when the end gear cover is open.)

13
8.3 Chuck Preparation
Read and understand all
directions for chuck preparation. Failure to
comply may cause serious injury and/or
damage to the lathe.
The three-jaw scroll chuck is shipped pre-
installed on the lathe. It can be used for
clamping cylindrical, triangular and hexagonal
stock, and has reversible jaws.
The four-jaw chuck has independently
adjustable jaws, and permits the holding of
square and asymmetrical pieces. It also enables
accurate concentric set-up of cylindrical pieces.
Use an assistant or hoist to
help remove a chuck.
Before removing a chuck, place a flat piece of
thick plywood across the bedways under the
chuck to prevent damage to the bedways should
the chuck fall from your hands. Alternatively,
many users make a wood chuck cradle that sits
atop the ways and accepts the specific diameter
of chuck. Figure 6 shows an example.
Figure 6 – Chuck cradle (not included)
To remove a chuck from the spindle:
1. Support the chuck while turning six
camlocks 1/4-turn counterclockwise, using
the chuck wrench from the tool box. See
Figure 7.
2. Carefully remove the chuck from the spindle
and place on a firm work surface. If the
spindle seems stuck, use a mallet at various
points on the back side to help free it from
the spindle.
3. Inspect the camlock studs. Make sure they
have not become cracked or broken during
transit. Clean all parts thoroughly with
solvent. Also clean the spindle and
camlocks.
4. Cover all chuck jaws and the scroll inside
the chuck with #2 lithium tube grease. Cover
the spindle, camlocks, and chuck body with
a light film of 20W oil.
5. Lift the chuck up to the spindle nose and
press onto the spindle. Tighten in place by
turning the camlocks 1/4 turn clockwise. The
index mark (A, Figure 7) on the camlock
should be between the two indicator arrows
(B) when tight, as shown in Figure 7.
•If the index mark (A) is not between the
two arrows, i.e. the cam turns beyond the
indicator arrows, then remove the chuck
and turn the camlock stud IN one full
turn.
•If a camlock will not engage, remove the
chuck and turn the camlock stud OUT
one full turn.
6. Make sure chuck is secure on the spindle
with the camlocks correctly engaged.
Figure 7 – Camlocks
8.4 Break-In Period
Do not run the lathe above 560 RPM for the first
six hours of operation, to allow gears and
bearings to adapt and run smoothly.

14
9.0 Maintenance/Lubrication
Lathe must be serviced at all
lubrication points and all reservoirs filled to
operating level before the lathe is put into
service. Failure to comply may cause serious
damage to the lathe.
The ZH series lathe is shipped with oil in the
reservoirs. Coolant is not included.
Use clean lubricants and check levels often,
including before each working shift. To ensure
proper lubrication, oil levels should not be less
than the center of the oil sight glass. Try not to
overfill, as this may cause leakage.
A chart is supplied in section 15.0 for quick
reference to all lubrication points.
Unless specified otherwise, the lubrication points
require a non-detergent, ISO 68, SAE 20W oil.
The recommended brand for this lathe is Mobil
DTE
®
Oil Heavy Medium.
1. Chuck – In addition to the lubrication
already described under Chuck Preparation,
daily lubricate the chuck with SAE 20W oil
through the ball oiler, shown in Figure 8.
Figure 8 – Chuck lubrication
2. Headstock – Oil must be up to indicator
mark in oil sight glass at the rear of the
headstock. [NOTE: The sight glass on the
front of the headstock (A, Figure 9) verifies
operation of the oil pump, the one at rear of
headstock (not shown) indicates oil level].
Top off with SAE 20W oil. Fill by removing
the rubber mat and unscrewing the plug (B)
on top of the headstock.
3. To drain the headstock, remove the nut on
the drain pipe (C, figure 10). Drain oil
completely and clean out all metal shavings,
then rinse the casting case with kerosene.
During the breaking-in process for the lathe,
the first oil change should be after 10 days;
the second after 20 days. Then change the
oil in the headstock every three months.
Figure 9 – Headstock lubrication
Figure 10 – Lubrication points
4. Oil Filter – The filter should be cleaned
once a month. To access, open the top
cover on the headstock, unscrew the nut on
the oil line, and pull up the oil line to bring
the filter up. See Figure 11. Use a brush to
clean.

15
Figure 11 – Oil filter access
5. Change Gear Axle – Periodically remove
end plug (J, Figure 10) and press #2 lithium
grease into the axle to lubricate the gear
axle and sleeve. Coat all gears with non-
slinging grease.
6. Gearbox – Oil must be up to indicator mark
in oil sight glass (D, Figure 9). Top off with
SAE 20W oil. To add oil to the gearbox, pour
it into the pan (E, Figure 10). To drain,
remove drain plug (F, Figure 10). Drain oil
completely and refill after the first three
months of operation. Then change oil in the
gearbox every six months.
7. Apron – Oil must be between indicator
marks in the oil sight glass (G, Figure 12).
Top off with SAE 20W oil. Unscrew oil plug
(H, Figure 12) to fill. To drain, remove drain
plug on the underside of apron. Drain oil
completely and refill after the first three
months of operation. Then, change oil in the
apron annually.
Figure 12 – Lubrication points
One-shot Lube System: Pull knob (I, Figure
12) and hold for several seconds to allow oil
to fill the pump from the apron reservoir.
Then release the knob which will push the
oil through various oil lines to lubricate the
ways below the saddle. Perform this several
times daily.
8. Threading Dial – Frequently lubricate via
one ball oiler (P, Figure 12) on top of the dial
with SAE 20W oil.
9. Cross Slide – Daily lubricate one ball oiler
on the handwheel housing (L, Figure 12)
and three ball oilers on the platform (K,
Figure 13), with SAE 20W oil.
Figure 13 – Lubrication points
10. Saddle – The anti-dust felt on both ends of
the v-guide ways (Figure 14) should be
cleaned weekly with kerosene. If the felt
becomes damaged, replace it.
Figure 14 – Anti-dust felt
11. Compound Rest – Daily lubricate two ball
oilers (M, Figure 13) on top of compound
rest with SAE 20W oil.
12. Tool Post – Regularly clean dirt and coolant
from around the tool post to maintain its re-
positioning accuracy. Daily lubricate one ball
oiler on top the clamping hub (N, Figure 12)
with SAE 20W oil.

16
13. Leadscrew, Feed Rod, and Direction
Control Axle – Slide the cover on the right
side bracket (Figure 15) to expose the oil
port and fill with SAE 20W oil daily. The oil is
distributed to all three elements by a woolen
line.
Figure 15 – Lubrication points
14. Travel Setting Rod – Periodically insert
SAE 20W oil into the ball oiler on each end
of the rod (Figure 9).
15. Tailstock – Daily lubricate two ball oilers
(Figure 16) on top of tailstock with SAE 20W
oil.
The anti-dust felt beneath the tailstock that
runs along the ways should be cleaned
weekly with kerosene. If the felts become
damaged, replace them.
Figure 16 – Tailstock lubrication
16. V-Belts – Regularly check and adjust the
tightness of the v-belts to prolong their
service life. See section 13.5.
9.1 Coolant Preparation
Follow local regulations
and/or coolant manufacturer’s recommend-
dations for use, care and disposal.
1. GH-2680ZH: Remove access cover on the
tailstock end of the lathe stand. Make sure
coolant pump has not shifted during
transport. Pour four gallons (approximate) of
coolant mix into the reservoir.
GH-26120ZH: Pour coolant (approx. four
gallons) into one of the chip trays (Figure
17). Or, slide out one of the chip trays and
pour directly into the side trough on the
center stand.
2. After machine has been connected to
power, turn on coolant pump and check to
see that coolant is cycling properly. Flow is
controlled by the tap at the base of the
nozzle.
3. Reinstall access cover or chip tray.
Figure 17 – GH-26120ZH chip trays
10.0 Electrical Connections
Electrical connections must
be made by a qualified electrician in
compliance with all relevant codes. This
machine must be properly grounded while in
use to help protect the operator from
electrical shock and possible fatal injury.
The main motor is rated for 230/460V and
comes from the factory prewired at 230V.
Confirm that power available at the lathe’s
location is the same rating as the lathe.
A minimum 10-gauge wire should be used for
incoming power leads.

17
IMPORTANT: The lathe must be wired properly
and phased correctly. The spindle must rotate
counterclockwise (as viewed from the tailstock
end) while the feed rod must rotate clockwise
(as viewed from the tailstock end). If the motor
runs and the lathe operates, but the rapid
traverse does not function, this signals that the
machine has been incorrectly phased. If this
occurs, disconnect lathe from power source and
switch any two of the three power leads (not the
green ground wire).
Main Power Switch (Figure 18).
Power Source Cable Receiver (Figure 18).
Make sure the lathe is properly grounded.
Figure 18 – Power input
10.1 Conversion to 460 Volt Operation
Disconnect machine from
power source. Failure to do so may cause
serious or fatal injury.
Wiring diagrams are located at the relevant
areas on the machine; each diagram is also
provided in section 17.0. Should discrepancies
exist, the diagrams on the machine take
precedence.
There are five steps involved in converting to
460 volt power:
1. Main Motor: Open lower panel at rear of
lathe beneath the gearbox, and change the
wires in the junction box on the main motor,
according to the diagram on the junction box
cover.
2. Rapid Feed Motor: Remove the control
panel on the saddle (Figure 19) to rewire the
rapid feed motor. The diagram is located on
the right side of the apron near the
directional lever. It is not necessary to pull
out the rapid feed motor for voltage
conversion.
Figure 19 – Rapid feed motor wire access
3. Coolant Pump:
GH-2680ZH: Open access panel on the
base at the tailstock end. Change wires in
coolant pump junction box according to
diagram on the junction box cover.
GH-26120ZH:
1) Remove top panel inside the bed
(Figure 20).
2) Remove rear panel on center stand then
remove the two socket head screws
(Figure 21) that secure the plate on
which the coolant pump is mounted.
Figure 20 –Coolant pump access (GH-26120ZH)

18
Figure 21 – Coolant pump access (GH-26120ZH)
3) Tilt the plate until you can reach the
coolant pump junction box through the
top opening in the bed. Follow the
diagram on the coolant pump to change
the leads.
4) Properly orient the pump, and secure
the plate with the two screws.
5) Close both covers.
4. Transformer: Open electrical box on rear of
machine on the headstock side. Switch wire
from 230V terminal to 460V terminal as
outlined on the transformer label (Figure 22).
5. Overload Relays: In the electrical box, turn
down the dials on both of the relays (Figure
22) to the appropriate amperage. That is,
from 4.0 to 2.5 on the first relay, and 1.0 to
0.63 on the second relay.
Figure 22 – Voltage conversion elements
Voltage conversion is now complete. Close the
electrical box before operating the lathe.
11.0 Basic Controls
Figure 23 – Headstock Controls
Figure 24 – Alternate controls
1. Control Panel: Located on front of
headstock. An abbreviated control panel is
also mounted to front of carriage.
•Power Indicator Light (A, Figure 23).
Illuminates whenever lathe is receiving
power.
•Emergency Stop Button (B, Figure 23
and 24). Shuts down all machine
functions. NOTE: Lathe will still have
power. Twist button clockwise to reset.
•ON Button (C, Figure 23 and 24).
Activates motor.
•Coolant On-Off Switch (D, Figure 23).
Activates coolant pump.
2. Speed Selection Levers (E, Figure 23):
Located on front of headstock. Move levers
left or right to desired spindle speed,
according to accompanying chart on the
dial.

19
3. Feed Direction Lever (F, Figure 23):
Located on front of headstock. Moving the
lever changes direction of feed. Center
position is neutral.
Do not move feed
direction lever while machine is running.
4. Lead and Feed Selector Levers (G, Figure
23): Located on front of headstock. Used
conjunctively to set up for threading or
feeding, according to the accompanying
chart (H).
Lever G
1
is the thread change control, and
is also used for altering the feed setting. The
symbols on the dial are identified as follows:
t= metric threads
n= inch threads
m= module threads
DP = diametral threads
= for driving leadscrew directly,
instead of through thread change device,
when cutting non-standard threads.
Lever G
2
selects pitch and feed.
Lever G
3
doubles the pitch or feed
differently at the following positions:
I/II/III/IV = The leadscrew works to cut
threads.
A/B/C/D = The feed rod does the
feeding.
The ratios between them are:
I: II: III: IV: = A:B:C:D = 1:2:4:8
Figure 25 – Carriage controls and settings
5. Carriage Lock (J, Figure 25): Located on
top right of carriage. Turn clockwise to lock,
counterclockwise to unlock.
Carriage lock must be
loose before moving carriage or damage
to lathe may occur.
6. Carriage Handwheel (K, Figure 25):
Located on the apron. Rotate handwheel
clockwise to move carriage assembly toward
tailstock (right). Rotate the wheel
counterclockwise to move carriage
assembly toward headstock (left). A scale is
mounted to the ring, graduated in 0.05 inch
increments, and can be calibrated by
loosening the thumb screw lock and rotating
the ring as needed. Always re-tighten ring
before using the feed.
7. Half Nut Lever (L, Figure 25): Located on
front of apron assembly. Engages the
leadscrew for threading operations.
8. Threading Dial (Figure 26): Indicates the
point on the leadscrew where the half nut
can be re-engaged to continue inch
threading.
Figure 26
9. Spindle Direction Control Lever (M,
Figure 25). Move lever to the right so that its
tab clears the notch, then down for forward
spindle rotation, or up for reverse spindle
rotation. Allow spindle to come to a stop
before changing directions.
Position lever in neutral position (tab in
notch) before shutting off the lathe.
10. Feed Direction Lever (N, Figure 25): Left
and right moves the carriage in the
corresponding directions (longitudinal feed);
up and down moves the cross slide (cross
feed).
11. Rapid Traverse Button (O, Figure 25).
Push for rapid movement in the direction set

20
by the feed direction lever. Rapid
longitudinal movement disengages the
carriage handwheel. However, the cross
slide handwheel should be disengaged
(pull it out) before using rapid feed.
IMPORTANT: The rapid traverse button is
not used for actual feeding of the tool, only
for initial positioning. Also, be aware that
engaging the rapid traverse will override
automatic feed.
12. Cross Slide Handwheel (P, Figure 25):
Located above apron assembly. Clockwise
rotation moves cross slide toward rear of
machine. The accompanying scale is
graduated in 0.002 inch increments. Before
using rapid feed, disengage this handle by
pulling it outward.
13. Compound Rest (Q, Figure 25): Located on
top of the cross slide and can be rotated
360° by loosening four nuts (two in front, two
in back). There are calibrations in degrees
(Q
1
, Figure 25) to assist in placement of the
compound rest to the desired angle.
14. Compound Rest Handle (R, Figure 25):
Rotate clockwise or counterclockwise to
position. The accompanying scale on the
collar is graduated in 0.001 inch increments.
15. Tool Post Clamping Lever (S, Figure 25):
Rotate counterclockwise to loosen and
clockwise to tighten. Always use minimum of
two clamping screws to secure a cutting
tool.
Figure 27 – Tailstock controls
16. Tailstock Quill Clamping Lever (T, Figure
27): Rotate clockwise to lock the sleeve.
Rotate counterclockwise to unlock.
17. Tailstock Clamping Lever (U, Figure 27):
Lift up to lock. Push down to unlock.
18. Tailstock Quill Traverse Handwheel (V,
Figure 27): Rotate clockwise to advance the
quill and counterclockwise to retract it. Fully
retract it to eject a center or drill chuck.
Figure 28 – Other controls
19. Foot Brake (W, Figure 28): For emergency
shutdown of all lathe functions. The
connecting rod mechanism is in the bed
stand, and activates a brake strap at the
main motor. (Caution: Lathe still has
power.)
The foot brake is not intended for normal
stopping of the lathe. Overuse can result in
hastened wear of brake parts.
20. Manual Carriage Stop (X, Figure 28): Can
be used during manual feed operation to
limit carriage travel. NOTE: It is not intended
to stop the carriage during automatic feed.
The carriage stop can be repositioned along
the bed by loosening the two screws
underneath the stop.
21. Travel Setting Rod (Y, Figure 28): Up to six
pre-set configurations are possible for
repetitive operations, without having to re-
position the stops each time. Use the
knurled knob at the right end of the rod to
set the rod at one of six positions shown on
the dial. Then move the desired number of
eccentric stops into position for that
particular operation and tighten them
securely to the rod with the screws beneath
them. When the apron trip lever contacts a
stop, the clutch will disengage.