Joyce RWB3250 User Manual

Joyce/Dayton Corp

.

Operation and Maintenance Manual for Joyce/Dayton

Ball Screw Jacks

WARNING!

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.

Ball screw jacks are not self-locking, and can lower under load. A brake motor or other external
locking device must be provided. Customer is responsible for providing travel stops.

©2009 Joyce/Dayton Corp. All rights reserved FB0172 – 04-09

Table of Contents

Section I – General Information

1-1 Contacting Joyce Dayton Corp..................................................................................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.....................................................................................................................4

2-3 Disassembly....................................................................................................................5

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

2-5 Assembly of Ball Screw Jacks...................................................................................7

2-6 Ball Nut Disassembly and Rebuild............................................................................7

Section III – Views &Parts list

3-1 Exploded View KFTN Jack.............................................................................................8

3-2 Parts List for KFTN Jack................................................................................................9

3-3 Exploded View Translating Jack..................................................................................10

3-4 Parts List for Translating Jack......................................................................................11

3-5 Specifications...................................................................................................................12

3-6 Maintenance Log/Serial Tag Information...................................................................14

Section I

General Information

1-1 Contacting Joyce Dayton Corp.

Joyce Dayton Corp.
P.O. Box 1630
Dayton, OH 45401
[phone] (US and Canada only)
[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 ball screw jacks. Although this manual covers the standard jacks and most
variations of the Joyce/Dayton ball 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

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replacement or refund of the purchase price, of any products or parts or 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. 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.

5. In the event that service or maintenance is required, the load must be secured or removed
before any work can begin. A brake motor does not qualify as securing the load. A failure
in other parts (e.g., a shaft or coupling) will allow the load to lower even though the brake is
engaged.

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

7. Never allow the jack to retract beyond the minimum closed position, as damage to the ball­nut 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. Although ball screws are more efficient than machine screw jacks, wormgear jacks are not
considered continuous duty actuators. 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.

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.

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

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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 are designed to 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 thru the fitting on the jack with
hand or power operated equipment. Usually one-quarter ounce, (about 8 pumps of a hand
grease gun) is sufficient. Grease with No. 1 Consistency EP Grease. Do not allow jacks to
operate un-lubricated. It is the responsibility of the user to maintain sufficient lubrication of
the jack.

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

Mobilith...........................................SHC 221

Mobilith...........................................SHC 460

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

5. Ball screw and ball nut (KFTN models only) should be lubricated with a spindle or 10­weight oil applied to the ball screw.

6. Do not operate jack or ball screw without lubrication.

7. Total grease capacity of gear box by jack type:

Jack Capacity Shots Weight Jack

Capacity
1 ton 5 1.8 oz. 20 ton 95 33 oz.
2 ton 13 4.5 oz 30 ton 135 47 oz.
5 ton 26 9 oz 50 ton 230 81 oz.

10 ton 50 17 oz

2-2 Repair Parts

Repair parts may be obtained by calling Joyce/Dayton Customer Service at [phone],
[phone], [phone] (facsimile), or your local sales representative. When ordering
repair parts, please supply the serial number (located on the jack nameplate).

1. The following parts are recommended for repair or rebuild. Exploded View Section 3-1, 3-2.
A. (2) Worm shaft bearing and race – Item 3
B. (1) Shim kit – Assortment of items 4, 5, 6
C. (2) Worm shaft seal – Item 9 (2-ton and above)

Shots Weight

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D. (1) Worm – item 10
E. (1) Thrust bearing lower– Item 11
F. (1) Thrust bearing upper – Item 12
G. (1) Wormgear – Item 13
H. (1) Ball nut (return tubes and balls only for rebuild)– Item 16
I. (1) Ball screw – item 17
J. (1) Ball screw shaft seal, KFTN only – item 25 (inverted), item 20 (upright)
K. (1) Boot and clamps for translating jack–Item 22, 23, 24
L. (1) Boot (lower) and clamps for KFTN– Item 27, 28, 29
M. (1) Boot (upper) and clamps for KFTN – Item 30, 31, 32

2-3 Disassembly of Ball Screw Jacks

Use the appropriate disassembly procedure. If the ball nut (with the re-circulating ball
bearings) is on the screw outside the sleeve, the jack is a Keyed for Traveling Nut (KFTN). This
is also called a “rotating screw” jack. If the ball nut is inside the jack sleeve, 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: Sections 3-1 & 3-2

1. Tape or otherwise secure the ball nut (item 16) to the ball screw (item 17). Removal of the
ball nut from the screw would allow all of the ball bearings to be released. Remove the boot
clamps (item 27,29,30,32) and collapse boots (item 28, 31) if the jack is equipped with boots.

2. On upright jacks loosen the (4) set screws (item 19) in the sleeve cap assembly, which
includes the sleeve cap (item 14), bushing (item 15) and seal (item 20) and loosen the
sleeve cap assembly by rotating counter-clockwise (CCW.)

3. On inverted KFTN models remove the sleeve cap (item 14) by loosening the (4) set screws
(item 19) and rotating CCW. The inverted model has a solid sleeve cap without a bushing or
seal.

4. On upright KFTN models, the ball screw assembly (with the sleeve cap assembly) can now
be removed from the jack sleeve. The ball screw assembly consists of the ball screw (item

17), the ball nut (item 16), the thrust bearings (item 11,12), the thrust sleeve (item 33), the
retaining nut (item 22), the key (item 21) and the wormgear (item 13). The retaining nut (item

22) can be removed from the ball screw assembly by loosening the setscrew (item 23) and
unthreading the retaining nut. The wormgear will then slide off the end of screw and the
upper thrust bearing, the sleeve cap assembly can be removed from the ball screw. Note:
The thrust sleeve is secured to the ball screw with a thread adhesive. Removal of the thrust
sleeve may be necessary for the sleeve cap removal. The thrust sleeve and retaining nut
must be heated to 500° Fahrenheit to be removed.

5. On inverted KFTN models, the ball screw assembly is removed from the bottom of the
sleeve. First, remove the upper thrust bearing (item 12) and then remove the set screw (item

23) from the retaining nut. The retaining nut (item 22) can now be un-screwed from the
wormgear. Remove the inverted bushing (item 26) or the key will damage the seal (item 25).
Push the ball screw (item 17) and the key (item 21), out the bottom of the sleeve only when
the retaining nut and bushing have been removed. Remove the wormgear (item 13) and the
lower thrust bearing (item 11) from the sleeve. Note: The thrust sleeve is secured to the ball
screw with a thread adhesive. It is not necessary to remove this adhesive when removing
the sleeve cap. If removal becomes necessary, heat the thrust sleeve and retaining nut to
500° Fahrenheit.

6. It is not recommended to remove the ball nut (item # 16) from the ball screw (item 17)
unless it is being replaced. For instructions on removing the ball nut, see Section 2- 6, Ball
nut disassembly and rebuild.

7. Remove (6) screws, 3 per side (item 8) from the bearing cap (item 7). Remove the bearing
caps and seals (item 9) carefully to avoid damaging seals. Make sure worm shaft keys have
been removed first. Note: the one-ton jack has retaining clips.

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