Joyce/Dayton Corp. Operation and Maintenance Manual Joyce/Dayton Metric 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.
Table of Contents Section I – General Information 1-1 1-2 1-3 1-4 1-5 1-6 Contact Joyce Dayton Corp ................................................................................... 2 Purpose and Scope.................................................................................................. 2 Receipt of Product ................................................................................................... 2 Warranty..............................................................................
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 Magnuson-Moss Warranty-Federal Trade Commission Improvement Act, 15 U. S. C.
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, ensure that 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 ensure that the load is aligned with the lifting screw. 8.
2-2 Repair Parts Obtain repair parts by calling Joyce Dayton Customer Service at (800) 523-5204, (937) 2946261, (937) 297-9391 (facsimile) or call your local representative. When ordering repair parts, please supply the serial number (located on the jack nameplate). For recommended repair parts for rebuild or spares, refer to Section 3-1, Exploded View, and Section 3-2, Parts List. A. (2) Thrust bearing – Item # 4 B. (1) Wormgear – Item #5 C. (2) Worm shaft bearing – Item # 6 D.
3. 4. 5. 6. 7. the lifting screw is removed from the jack. If the jack does not have stops, the lifting screw can be removed by simply unthreading it from the wormgear. Remove the thrust bearings (item # 4) and the wormgear (item # 5) from the sleeve. The bearing cones may be pressed onto the wormgear. Keyed jacks have a keyway cut the length of the lifting screw (item # 35). A keyed sleeve cap (item # 17) has a key (item # 30), which travels in the keyway and prevents rotation of the lifting screw.
Section III Views & Parts List 3-1 Exploded View 7
3-2 Parts List – Translating and KFTN jacks Table 3-1 Metric Parts list Item Translating Item KFTN- Keyed For Traveling Nut 1 1a 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Sleeve Sleeve (MWJ51 & MWJ201 jack) Sleeve Cap Bearing Cap (2) Thrust Bearing Wormgear Worm Shaft Bearing (2) Worm Shaft Seal (2) Shims Bearing Cap Lockwasher (6-8) Bearing Cap Screw (6-8) Protection Tube Worm (Input Shaft) Set Screw – sleeve cap (4) Lifting Screw Protection
3-3 Specifications Model Number MWJ51 MWJ201 MWJT62.5 MWJT122.5 MWJT242.5 MWJT65 MWJT125 MWJT245 MWJ810 MWJ2410 Capacity 10 kN 25 kN 50 kN 100 kN Screw Tr 20 x 5 30 x 6 40 x 9 55 x 12 Worm Gear Ratio 5:1 20:1 6:1 12:1 24:1 6:1 12:1 24:1 8:1 24:1 Worm Shaft Turns for 1 mm 1 4 1 2 4 0.67 1.33 2.67 0.67 2 Tare Torque (Nm) 0.33 0.67 1.13 2.26 Starting Torque (Nm) 95 W* 41 W* 1.01 W* 0.62 W* 0.44 W* 1.64 W* 1.03 W* 0.74 W* 1.53 W* 0.76 W* Operating Torque (Nm) @ Worm RPM 0.
3-4 Serial Number Tag and Maintenance Log Date Maintenance Performed Initials Joyce Dayton Serial Number Tag Contact Joyce Dayton Corporation and provide the serial number to obtain the product information needed for maintenance, repair and reorder. Joyce Dayton Corp P.O. Box 1630 Dayton, Ohio 45401 Phone (800) 523-5204 (U.S. & Canada); (937) 294-6261 Fax (937) 297-7173 www.joycedayton.com E-mail: sales.jacks@joycedayton.