Joyce Machine Screw Jacks User Manual

Joyce/Dayton Corp

.

Operation and Maintenance Manual for Joyce/Dayton

Machine Screw Jacks

The product described in this catalog is for industrial use only. It may not be used to lift or
support people without prior written approval from the Joyce/Dayton Corp. The
recommendations in this manual for installation, operation and maintenance must be followed
to ensure safe use. All persons responsible for the installation and use of Joyce Jacks must be
familiar with the contents of this manual.

Customer is responsible for providing end of travel limits.

©2012 Joyce/Dayton Corp. All rights reserved FB0173 – 2-12

Table of Contents

Section I – General Information

1-1 Contact Joyce/Dayton.............................................................................................2

1-2 Purpose and Scope..................................................................................................2

1-3 Receipt of Product ...................................................................................................2

1-4 Warranty.....................................................................................................................2

1-5 Precautions of Use and Installation......................................................................3

1-6 General Installation Instructions............................................................................3

Section II – Maintenance

2-1 Lubrication ................................................................................................................4

2-2 Repair Parts...............................................................................................................5

2-3 Disassembly of Machine Screw Jacks.................................................................5

2-4 Inspection of Components.....................................................................................6

2-5 Assembly of Machine Screw Jacks.......................................................................6

2-6 100-ton and 150-ton Jacks......................................................................................7

Section III – Views & Parts list

3-1 Exploded View..........................................................................................................8

3-2 Parts List ...................................................................................................................9

3-3 Specifications............................................................................................................10

3-4 Serial Number and Maintenance............................................................................15

Section I

General Information

1-1 Contact Joyce/Dayton Corp.

Joyce/Dayton Corp.
P.O. Box 1630
Dayton, OH 45401
[phone] (US and Canada)
[phone] [phone] Fax
Email: [e-mail]
Website: www.joycedayton.com

1-2 Purpose and Scope

This manual provides installation, operation and maintenance instruction for standard
Joyce/Dayton Machine Screw Jacks. Although this manual covers the standard jacks and
most variations of the Joyce/Dayton Machine Screw Jack, there may be some jacks that
vary significantly from this manual. For special jacks not covered, please contact
Joyce/Dayton Corp. for assistance.

1-3 Receipt of Product

All equipment should be immediately inspected upon receipt for any damage and to verify
correct product and quantities. Any problems should be reported to Joyce/Dayton Corp.
and the freight carrier as soon as possible. Products returned without a Return Goods
Authorization (RGA) form will not be accepted.

1-4 Warranty

Seller warrants its products to be free from defects in material and workmanship under
normal and proper use in accordance with instruction of seller for a period of one year
from the date of shipment to buyer. Seller's liability under such warranty or in connection
with any other claim relating to the products shall be limited to the repair, or at seller’s
option, the replacement or refund of the purchase price, of any products or parts or

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components thereof which are returned to seller freight prepaid and which are defective in
material or workmanship. Products or parts or components thereof, which are repaired or
replaced by seller, will be returned to buyer freight collect. This warranty is not intended to
cover consumer products, as defined in the Magnuson-Moss Warranty-Federal Trade
Commission Improvement Act, 15 U. S. C. Sections 2301-12, which are purchased by
buyer for purposes other than resale. If buyer is not intending to resell the products, and if
the products are consumer products as defined in the Magnuson-Moss Act, the foregoing
warranty, but not the limitation of seller's liability, shall be null and void. EXCEPT AS
EXPRESSLY STATED ABOVE, SELLER MAKES NO WARRANTY, EXPRESS OR
IMPLIED, WHETHER OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
PURPOSE OR USE OR OTHERWISE, ON THE PRODUCTS, OR ON ANY PARTS OR
LABOR FURNISHED DURING THE SALE, DELIVERY OR SERVICING OF THE
PRODUCTS.

1-5 Precautions of Use and Installation

1. Side loading of the lifting screw is not permitted in the dynamic operation of the jack.
A limited side load is allowable in the static condition. Contact Joyce/Dayton for the
allowable side load for a specific application.

2. Mechanical stops are not provided on the lifting screw unless requested. Therefore, it
is possible to drive the screw out of the jack sleeve (housing). It is the customer’s
responsibility to provide travel limit devices on all jacks. A mechanical stop, if
provided is only an auxiliary device to limit the travel of the lifting screw. Engaging a
mechanical stop during jack operation can cause damage to the internal jack
mechanism.

3. In most applications, factory or manufacturer-assisted installation is not required.
However, it is necessary that appropriate, qualified personnel perform the installation
of Joyce/Dayton products.

4. Joyce/Dayton jacks are not rated for shock-loading, extreme vibration or critical speed
conditions (high speed or long-length screw.) It is the responsibility of the user to
ensure these conditions are not imposed on a jack or the power transmission
equipment. Contact [e-mail] for technical assistance.

5. In the event that service or maintenance is required, the load must be secured or
removed before any work can begin.

6. The machine screw jacks can be mounted and operated in any orientation. When used
in a horizontal position, the worm should be mounted parallel with the horizon and
below the gear to ensure proper lubrication.

7. Never allow the jack to retract beyond the minimum closed position, as damage to the
jack can occur.

8. Boots or protective bellows covers should be used to protect and keep the lifting
screw clean in dusty or abrasive environments.

9. For continuous or high-duty cycles inquire with your local sales representative or
consult Joyce/Dayton Corp. regarding Bevel Ball actuators.

1-6 General Installation instructions

1. Ensure that all personnel who will service or operate equipment are familiar with its
use and limitations.

2. Secure or remove the load before any installation procedures begin.

3. Be certain the rating of the jack meets or exceeds the load.

4. The jacks must be mounted on a structure sufficient to support the maximum possible
load. The structure must be rigid. An under-designed structure could lead to bending
of the lifting screw causing premature wear or failure.

5. Drive shaft alignment is critical. Mis-alignment will cause reversing stresses in
rotating members and will lead to fatigue failure. Correct coupling specification is
important.

6. In a system with shafts, miter boxes, etc., confirm that the shafts and jacks operate
without binding or excessive force before powered drive devices are engaged.

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7. When fastening the load to a jack, make sure the jack is in the retracted position. This
positions the load accurately with respect to the jack screw centerline. Never pull the
screw to one side to make connection with your structure. Fully extend the jack to
make sure the load is aligned with the lifting screw.

8. All jacks should be mounted with S.A.E. Grade 8 bolts or equivalent.

9. Torque all mounting bolts in a symmetric pattern to avoid damage to the sleeve.

10. Shaft and coupling guards are the responsibility of the user.

11. Optional limit switches furnished with the jacks are NOT preset and require field
adjustment before use.

Section II

Maintenance

2-1 Lubrication

1. Jacks are lubricated before leaving the factory.

2. For normal operation, jacks should be greased at least once per month. Under
extended use, grease twice monthly or as conditions dictate. Grease through the
fitting on the jack with hand or power operated equipment. Grease with No. 1
Consistency Grease. Do not allow jacks to operate un-lubricated. It is the
responsibility of the user to maintain sufficient lubrication of the jack and to the lifting
screw.

3. The products listed below are recommended by the lubricant manufacturers to meet
the requirements for normal operation. The listing of brand names is solely for the
convenience of users of Joyce equipment and their lubricant suppliers; it does not
constitute any endorsement. Joyce/Dayton assumes no responsibilities for the quality,
performance or availability of any listed products

COMPANY.....................................BRAND NAME

Mobilgrease ..................................XHP 461

Mobilgrease ..................................XHP 221

Shell Oil Company.......................Retinax HD NLGI 1

Shell Oil Company.......................Albina SLC 460

Mobil Oil.........................................Mobilith SHC PM 460

4. For operation above 250° F or extreme loading, consult the Engineering Department of
Joyce/Dayton Corp.

5. Do not operate jack without lubrication.

6. Total grease capacity by jack type (estimated):

Jack Capacity Shots

250-1000 3 1.0 oz 25 ton 140 49 oz.

1 ton 5 1.8 oz. 30 ton 135 47 oz.
2 ton 13 4.5 oz 35 ton 135 47 oz.
3 ton 13 4.5 oz 50 ton 230 81 oz.
5 ton 26 9 oz 75 ton 525 184 oz.

10-15 ton 50 17 oz 100 ton 600 210 oz.

20 ton 95 33 oz. 150 ton 650 228 oz.

Approximate

Weight

Jack

Capacity

Shots

Approximate

Weight

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2-2 Repair Parts

Obtain repair parts by calling Joyce/Dayton Customer Service at [phone], (937) 294­6261, [phone] (facsimile) or by email [e-mail]. You may also call
your local sales representative. When ordering repair parts, please supply the serial
number (located on the jack nameplate).

Recommended repair parts for rebuild or spares. Refer to Section 3-1 Exploded View and
Section 3-2 Parts List.

A. (1) Thrust bearing – Item 4
B. (1) Worm gear – Item 5
C. (2) Worm shaft bearing and race – Item 6
D. (2) Worm shaft seal – Item 7 (2-ton and larger)
E. (1) Shim kit – Assortment of item 8
F. (1) Worm - 12
G. (1) Lifting screw - 14
H. (1) Boot (if signs of wear are evident) – Item 34
I. (1) Traveling Nut - 37

2-3 Disassembly of Machine Screw Jacks

Use the appropriate disassembly procedure – if the lifting nut is outside the jack on the
screw, the jack is a Keyed for Traveling Nut (KFTN), also called a “rotating screw”,
otherwise the jack is a translating model. Handle machined parts with care, and maintain
an “order of disassembly” to aid in re-assembly. Remove all couplings, screw support
bearings, etc. before beginning disassembly.

Disassembly Procedure for KFTN (rotating screw) Models: see Figure 3-1

1. Remove the boot clamps (item 33) and collapse boots (item 34), if the jack is equipped
with boots. Remove the traveling nut (item 37) from the screw.

2. Loosen the (4) set screws (item 13) in the sleeve cap and remove the sleeve cap by
rotating counter-clockwise (CCW.)

3. The screw assembly can now be removed from the jack sleeve. The screw assembly
consists of the machine screw (item 14), the upper thrust bearing (item 4), the key
(item 38) and the wormgear (item 5). The upper thrust bearing can be removed from
the assembly. The wormgear can be pressed off the screw for replacement if
necessary. Note: On inverted KFTN models, it may be necessary to remove the screw
first.

4. Remove screws (item 10) from the bearing cap (item 3). Remove the bearing caps and
seals (item 7) carefully to avoid damaging seals. Make sure keys have been removed
first. Note: the WJ250 thru WJ51 jacks have retaining clips (item 20) instead of bearing
caps.

5. Carefully remove the shims (item 8) from the jack sleeve or bearing cap. NOTE: there
will not necessarily be an equal quantity of shims per side. Keep track of the number
and order of shims on each side of the jack. The WJ250 thru WJ51 jacks do not have
shims.

6. Remove the worm bearings (item 6). The cup may be press-fit and require the use of a
dead-blow, plastic or other non-marring mallet to remove the worm (item 12).

Disassembly Procedure for Translating Models: see Figure 3-1

1. Remove the boot clamps (item 33) and collapse the boot (item 34) if equipped. On
upright and inverted models, loosen the (4) set screws (item 13) and remove the sleeve
cap (item 2) by rotating CCW.

2. Remove the protection tube (item 11) and check to see if the lifting screw has travel
stops. This may require the use of a pipe wrench or strap wrench. If the jack has travel

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