Joyce BG450D - Manual (Page 4)

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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 (800) 523-5204, (937) 294-6261, (937) 297-7173
(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)