Joyce Machine Screw Jacks - Manual (Page 4)

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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, c onsult 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
Approximate
Weight
Jack
Capacity
Shots
Approximate
Weight
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.