8
9
3. Unscrew lifting screw from drive
sleeve.
4. Remove socket head set screws in
housing.
5. Unscrew housing cover.
6. Remove end caps on worm shaft as-
sembly.
CAUTION
- Handle shims carefully to
avoid damage.
While tapping one end of the worm shaft
with a wooden mallet, turn the worm
shaft. This will loosen the bearing cup to
facilitate removal. (2 MSJ - 100 MSJ only)
7. Remove the worm shaft bearing
cups. (2 MSJ - 100 MSJ only)
8. Drive sleeve and gear assembly
should now lift easily from housing.
9. Worm shaft assembly can be re-
moved if necessary.
NOTES:
1. Bearing cones are press-fitted to worm
shaft. If removal is required use bearing
puller.
2. Removal of the bearings from the drive
sleeves of Jacks equipped with Taper
Roller bearings, may result in their being
damaged.
Rotating Units Disassembly
1. Remove set screws from housing.
2. Unscrew housing cover.
3. Remove end caps on worm shaft as-
sembly.
CAUTION
- Handle shims carefully to
avoid damage.
4. While tapping one end of the worm
shaft with a wooden mallet, turn the
8. Drive sleeve and gear assembly
should now lift easily from the hous-
ing.
9. Thrust bearing assembly can be re-
moved if required. (see note 2)
10. Worm shaft assembly can be re-
moved if necessary.
NOTES:
1. Bearing cones are press-fitted to
worm shaft. If removal is required us-
ing bearing puller.
2. Removal of the bearings from the
drive sleeves of Jacks equipped with
worm shaft. This will loosen the bear-
ing cup to facilitate removal.
5. Remove the worm shaft bearing
cups.
6. Drive sleeve and gear assembly can
now be lifted easily from the housing.
7. Thrust bearing assembly can be re-
moved if required. (see note 2)
8. Worm shaft assembly can be re-
moved if necessary.
NOTES:
1. Bearing cones are press-fitted to
worm shaft. If removal is required
use bearing puller.
2. Removal of the bearings from the
drive sleeves of Jacks equipped with
Tapered Roller bearings, may result in
their being damaged.
Keyed Units Disassembly
1. Remove key retaining bolt.
2. By turning worm shaft, drive lifting
screw and key from housing and re-
move key.
3. Remove set screws from housing
and cover.
4. Unscrew housing cover.
5. Remove end caps on worm shaft as-
sembly.
CAUTION
- Handle shims carefully to
avoid damage.
6. While tapping one end of the worm
shaft with a wooden mallet, turn the
worm shaft. This will loosen the bear-
ing cup to facilitate removal.
7. Remove the worm shaft bearing
cups.
Tapered Roller bearings, may result in
their being damaged.
REASSEMBLY
Your jack can be easily reassembled by
reversing the procedure as previously
outlined. In reversing disassembly proce-
dures, be sure to pack worm, worm gear,
and all bearings with grease. Also coat all
seal areas with grease. After unit is reas-
sembled, fill with grease, see page 3.
Reassembly may required that one worm
shaft ball bearing be pressed onto worm
shaft after drive sleeve and worm are as-
sembled in the housing.
TROUBLE SHOOTING TIPS
Your ActionJac™ Machine Screw Jack will perform satisfactorily if suggestions described
in this booklet are carefully followed. It is estimated that approximately 98 percent of
Machine Screw Jack failures can be attributed to improper lubrication, misapplication,
and misalignment.
TROUBLESHOOTING CHART
TROUBLE
WHAT TO INSPECT
ACTION
Worm Shaft Failure
1. Type of Coupling
Rigid Couplings can cause
shaft failure. Replace with
coupling will provide adequate
flexibility and lateral float.
2. Coupling Alignment
Realign as required.
3. Presence of Excessive
Overhung Load
Check jack for allowable loads.
4. Unit Overload
See Housing Failure No.1.
5. Shock Loading
Apply coupling capable of ab-
sorbing shock and, if neces-
sary, replace with unit of suf-
ficient capacity. Shock loads
can significantly increase ap-
parent dead weight loads.
6. "Ganging" Units
If several units are "in-line", the
worm shaft of the first unit
can assume 300% of the rat-
ed input torque. If this value is
exceeded, you must replace
with a larger unit.
