Joyce BG450D User Manual

Joyce/Dayton Corp

.

Operation and Maintenance Manual

BG 450 Bevel Gear Jacks

WARNING!

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/Dayton bevel gear jacks
must be familiar with the contents of this manual.

The customer is responsible for guards and other protective devices and for ensuring that bevel gear
jack usage conforms with local and national operating and safety codes appropriate to the class of
equipment into which the bevel gear jack is installed.

©2010 Joyce/Dayton Corp. All rights reserved FB0250- 1-2010

Table of Contents

Section I – General Information

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

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

1-4 Warranty............................................................................3

1-5 Precautions for Use.........................................................3

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

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

Section II – Maintenance

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

2-2 Repair Parts.......................................................................4

2-3 Sizing BG 450 Bevel Gear Jacks...................................5

Section III – Views and parts lists

3-1 BG 450 Bevel Gear Jack Drawing..................................6

3-2 BG 450 Bevel Gear Jack Parts List...............................7

3-3 BG 450 Bevel Gear Jack Part Numbers........................8

3-4 Maintenance Check ........................................................9

3-5 Maintenance Log..............................................................9

3-6 Joyce Dayton Serial Number Tag .................................10

Section I

General Information

1-1 Contact Joyce/Dayton Corp

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

1-2 Purpose and Scope

This manual provides installation, operation and maintenance instruction for the standard
Joyce/Dayton bevel gear jacks (BG450). Although this manual covers the standard bevel gear
jacks, some may vary significantly from this manual. For special units 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) will
not be accepted.

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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 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 Magnuson­Moss 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. Mechanical stops provided on BG 450 bevel gear jacks are not designed as end-of-travel
stops. The customer is responsible for setting travel limits.

2. Travel can be limited using optional limit switches. These limit switches need to be set by the
customer. 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.

3. Joyce/Dayton BG 450 bevel gear jacks are not rated for shock-loading or extreme vibration. It
is the responsibility of the user to ensure these conditions are not imposed on the actuator.

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

5. BG 450 bevel gear jacks can be mounted and operated in any orientation. Standard BG 450
bevel gear jacks have vents. Properly plug or vent holes to prevent dirt or moisture form
contaminating the actuator. Contact Joyce/Dayton with questions regarding the mounting
orientation.

6. Never allow the bevel gear jack to retract beyond the minimum closed position or extend
beyond the maximum open position, as damage to the unit can occur.

7. Do not use in applications where BG 450 bevel gear jacks can be jammed against an
immovable object.

8. A brake motor is required on BG 450 bevel gear jacks with double lead lifting screws. This
prevents the load from drifting when power is off.

9. Allowable load values differ based on the configuration of the jack (upright of inverted) and on
load characteristics (tension or compression). See Section 3-3 and contact Joyce/Dayton with
any questions regarding load characteristics.

10. Follow instructions in Section 2-3 to calculate the loads and duty cycles that are permissible on
BG 450 bevel gear jacks.

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 BG 450 bevel gear jack meets or exceeds the load.

4. The BG 450 bevel gear jack must be mounted on a rigid structure sufficient to support the
maximum possible load. An under-designed structure could lead to premature wear or failure.

5. Drive shaft alignment is critical. Misalignment will cause reversing stresses in rotating
members and will lead to fatigue failure. Correct coupling specification is critical for systems
with more than one bevel gear jack.

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6. For systems with more than one bevel gear jack, confirm that the bevel gear jacks and shafts
operate without binding or excessive force before power is applied.

7. When directly connecting between bevel gear jacks one must alternate bevel gear jacks with
right-hand and left-hand lifting screws to achieve synchronous lift patterns.

8. When fastening the load to a bevel gear jack, make sure the actuator is retracted. This
positions the load accurately with respect to the lifting screw centerline. Never pull the lifting
screw to one side to make connection with your structure. Next, fully extend the bevel gear
jack lifting screw to make sure the load is aligned.

9. All bevel gear jacks are to be mounted with S.A.E. Grade 8 bolts or equivalent.

10. Torque the mounting bolts in a systematic pattern to avoid damage to the actuator.

11. Optional limit switches, which may be furnished with the bevel gear jack, are NOT pre-set.
They require field adjustment before use.

12. Pinion speeds should not exceed 1750 RPM.

Section II

Maintenance

2-1 Lubrication

Bevel Gear Jack

1. Bevel gear jack housings may not be lubricated before leaving the factory.

2. Do not operate Bevel gear jack without lubrication.

3. Lubricate the housing* with SAE 90 weight oil or grease as specified. Contact Joyce/Dayton
with questions regarding the lubrication specifications of specific serial numbers.

4. Lubricate the upper bearing with XHP 221.

5. Lubricate the lifting screw on KFTN models is with XHP 461.

6. The products listed 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/Dayton 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 Bevel Gear Jack

Component

SAE 90 weight oil Housing*
Exxon Mobil Mobilgrease XHP 221 Housing*
Exxon Mobil Mobilgrease XHP 221 Upper Bearing
Exxon Mobil Mobilgrease XHP 461 Lifting Screw (KFTN)

2-2 Repair Parts

Joyce/Dayton recommends that BG 450 bevel gear jacks be returned to the factory for repairs.
Contact Joyce/Dayton Customer Service at [phone], [phone], [phone]
(facsimile) or your local sales representative. Please supply the serial number located on the
nameplate (see Section 3-6)..
The following are common parts used in repairing and rebuilding jacks.. See Sections 3-1 and 3-2
for a drawing and parts list for the BG 450 bevel gear jack. Customers may be able to replace lifting
screws themselves.

A. Thrust Bearing (2)
B. Bevel Pinion (1, 2, or 3)
C. Lifting Screw (1)
D. Protection Tube (2)
E. Retaining Ring (2, 4, or 6)
F. Input Shaft (1, 2 or 3)
G. Woodruff key (1, 2, or 3)

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H. Wiper Seal (1)
I. O-Ring (1, 2, or 3)
J. Shims (as needed)
K. Cover Gasket (1 or 2)

2-3 Sizing Bevel Gear Jacks - BG 450

When sizing a bevel gear jack consideration must be given to the relationship between the load,
travel speed, and duty cycle. Use the following procedure to determine the suitability of the BG 450
for your application. Use the steps below to calculate the load, travel speed, and duty cycle.

1. Determine the load in pounds.

2. Determine the velocity in feet per minute.

3. Determine the duty cycle in terms of minutes of operation (time on) and minutes resting (time
off).

4. Calculate PV = (load in pounds x velocity in feet per minute)/1000

5. Calculate T = (cooling time of 262 minutes x Time on)/Time off. Cooling time can be found in
Section 3-3.

6. Plot the point on the graph below for the calculated values. If the point falls below the line, the
application is satisfactory. If it is above the line, consider a double-lead lifting screw, or revise
the application to permit a value that falls below the plotted line.

7. Calculate the horsepower (HP) required:

a. RPM = velocity in feet per minute x 12 x input turns per 1” travel
b. HP = (Pinion Torque x Load x RPM) / 63,025

BG 450-S and BG 450-D Bevel Gear Jack

BG 450 S BG 450 D

200
150
100

T Values

50

0

0 20 40 60 80 100 120 140 160 180 200 220

PV Values

Consider the following additional information:

8. Data is calculated based on limiting the lifting nut temperature rise from 70 degrees F to 200
degrees F.

9. One must compare the choice of a single-lead screw verses a double-lead screw.

10. If using the bevel gear jack as an integral miter gearbox. Contact an application engineer for
horsepower limitations.

11. Bevel gear jacks with a single lead, “S” are inherently self-locking, in the absence of vibration.
A brake is required on bevel gear jacks with double lead lifting screws, “D”.

12. Special jacks are available. Contact Joyce/Dayton with your design requirements.

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3-1 BG 450 Bevel Gear Jack

Section III

Drawings

6

3-2 Parts list

Table 3-2 Parts list – BG 450 Bevel Gear Jack

Item

1 Bevel Gear Jack Sleeve (1)
2 Thrust Bearing (2)
3 Gear Mounting Flange (1)
4 BG 450 Gear (1)
5 Screw (12)
6 Screw (16)
7 Bearing Mounting Flange (1)
8 O-Ring (2)

9 Set Screw (6)
10 Upper Thrust Bearing Seal (1)
11 Air Vent (2)
12 Sleeve Cap (1)
13 Bushing (1)
14 Seal (2)
15 Boot (optional) (1)
16 Lifting Screw (1)
17 Grease fitting (4)
18 Protection tube (1)
19 Lifting Nut (1)
20 O Ring, Carrier (1, 2, or 3)
21 Carrier Housing (1, 2, or 3)
22 Set screw (8, 16, or 24)
23 Input shaft seal (1, 2, or 3)
24 Key (1, 2, or 3)
25 Pinion Shaft (1, 2, or 3)
26 Pinion Shaft Bearing (2, 4, or 6)
27 Key (1, 2, or 3)
28 Nut (1, 2, or 3)
29 Cotter Pin (1, 2, or 3)
30 Bushing, Protection Tube Adapter (1)
31 Set screw (4)

Nameplate (1)
Grease fitting (1)
Pipe Plug (1)
Traveling Nut (BG 450 KFTN style only) (1)

Not shown

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3-3 BG 450 Bevel Gear Jack Part Numbers

Model Number

Static Capacity

Upright screw in Compression

Static Capacity

Inverted screw in Tension

Static Capacity

Upright screw in Tension

Static Capacity

Inverted screw in Compression

BG 450 S BG 450 D

218,000 #

218,000#

200,000#

200,000#

Dynamic Load Capacity

Use JAX*

Software

Screw Diameter

Pitch/Lead

Bevel Gear Ratio 3:1 3:1

Pinion turns for

1” of travel

4 ½”

.5 Pitch

.5 Lead Acme

6 3

218,000#

218,000#

200,000#

200,000#

Use JAX*

Software

4 ½”

.5 Pitch

1.0 Lead Acme

Pinion Torque (in. #)

Screw Torque

Jack Efficiency

Jack Cooling Time (T)

Base Weight (Lbs)

Add for Each Inch of Travel (Lbs)

W*= Load in pounds
Pinion Torque: Torque required to continuously raise a given load.
Screw Torque: Torque required to resist screw rotation in translating jack designs and the torque required to resist rotation of the

traveling nut in Keyed for traveling nut designs.

Lead: The distance a screw advances axially in a single turn
Pitch: the distance from to point on a screw thread to a corresponding point on the next thread, measured axially
* JAX Software: available at www.joycedayton.com/Downloads.

.125 W* .154 W*

.356 W* .438 W*

21.9% 35.5%

262 minutes 262 minutes

650 650

5.5 5.5

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3-4 Maintenance Check

1. Check the pinion shaft for excessive backlash (more than 10% angular). If excessive
backlash is present contact Joyce/Dayton. The unit should be returned to Joyce/Dayton
for service. Only qualified personnel should perform this procedure.

2. Acme threads are the main support members in BG 450 bevel gear jacks. If they wear too
thin, the jack could fail. Determine wear by checking jackscrew endplay at least once per
month. Endplay is the gap between the lifting nut and the acme threads on the jackscrew.
Check the wear more frequently in severe applications.

a. Remove the load from the jack.
b. Make sure sleeve cap set screws are tightened.
c. Mark a reference point on the screw.
d. Move screw upward away from the bevel gear housing.
e. Measure the distance moved from the reference mark.
f. Record the endplay in a log.
g. To determine if the lifting screw needs to be replaced please contact

Joyce/Dayton with this information as well as the serial number, load, and speed
information.

3. Periodically inspect the bearings, bushings and other components for signs of excessive
wear.

3-5 Maintenance Log

Date Maintenance Performed Initials

9

3-6 Joyce Dayton Serial Number Tag

To obtain product information needed for maintenance, repair and reorder,

contact Joyce Dayton Corporation and provide the serial number.

Joyce/Dayton Corp

P.O. Box 1630

Dayton, Ohio 45401

Phone [phone] (U.S. & Canada); [phone] Fax [phone]

www.joycedayton.com E-mail: [email protected]

©2010 Joyce/Dayton Corp. All rights reserved FB0250-1-2010

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