2
3
CAUTION
- The customer is responsible
for providing stops at either end of travel.
Machine Screw Jacks are usually self-lock-
ing. However, self-lowering or creep could
result from vibratory conditions. In these
cases, a brake should be considered.
Overtravel could cause the lifting screw to
become disengaged from the drive sleeve.
GENERAL INSTRUCTIONS
Your Machine Screw Jack is a high quality,
sturdy unit designed to give many hours
of trouble-free service. However, certain
precautions and procedures must be ob-
served in handling, installing and servicing
the unit in order to obtain optimum perfor-
mance.
1. Any apparent or suspected dam-
age to equipment manufactured or
furnished by Nook Industries during
transport from the factory to the user
should be immediately reported to
both Nook Industries and the carrier.
2. Upon delivery all equipment fur-
nished should be carefully invento-
ried against shipping papers to de-
termine whether any shortages exist
in delivered material. Any such short-
ages must immediately be reported
to Nook Industries and the carrier.
3. The installation of most power trans-
mission equipment does not normally
require the services of a factory engi-
neer. These services are not included
in the selling price of the equipment
unless specifically agreed upon in
writing between the seller and pur-
chaser. In applications requiring a
more complex arrangement of com-
ponents, consideration should be
given to the use of a factory engineer
for construction super-vision or check-
out of the installation. These services
are available from Nook Industries by
contacting the Service Department.
4. The Seller’s warranty applies insofar
as the unit is operated within the rat-
ing and service conditions for which
it was specifically sold. The purchaser
must prevent the existence of any
destructive external conditions which
might typically include vibratory loads
due to critical speeds, severe shock
loading, mechanical or thermal over-
loads, or side loads.
5. Adequate installation, maintenance
and safety instructions must be given
by the user to personnel directly re-
sponsible for the installation and op-
eration of the equipment.
6. In the event of malfunction within the
warranty period, the manufacturer
must be informed promptly or, in any
event, within thirty days if it is intend-
ed that the warranty is to covert the
incident.
CAUTION
- UNITS ARE NOT MEANT FOR
PERSONNEL SUPPORT. Refer all applica-
tions for potential personnel support to the
factory for approval.
ORDERING SPARE/REPAIR PARTS
This booklet contains general instructions,
operating, maintenance and troubleshoot-
ing instructions for your ActionJac™ Worm
Gear Jack. In the event spare or repair
parts are required, call your local represen-
tative or contact Nook Industries at (216)
271-7900 or 1(800) 321-7800.
Please provide the following information
when requesting spare/repair parts:
• Jack Size & Type Designation (i.e., 2 MSJ)
• Serial Number & Year of Manufacture (lo-
cated on housing nameplate)
• Stroke Length
• Part Description (see pages 6-7)
GENERAL SPECIFICATIONS
The worm gear driven Machine Screw
Jack incorporates an alloy steel worm
which drives a high tensile bronze worm
gear, accurately machined to the high stan-
dards of Nook Industries for maximum
load carrying capacity and uniformity of
motion transmission. All shafts are mount-
ed on heavy duty, anti-friction bearings to
increase operating efficiency of the drive
mechanism. Thrust bearings are provided
to support the rated thrust load of each
unit. Housings are made of high strength
material, well proportioned to handle the
rated thrust and torque loads of each size
unit.
CAUTION
- In the absence of internal or
external stops, it is possible to run the lift-
ing screw out of the unit. Your Machine
Screw Jack is NOT equipped with internal
stops unless specifically requested in your
order.
A lifting screw cover is threaded into the
bottom of the unit on the upright model,
or in the top of the unit on the inverted
model, in order to keep the lifting screw
threads free of foreign material.
Depending upon which jack model is pur-
chased, the lifting screw is made of 4140
heat treated steel, 304 or 316 stainless
steel, or a special alloy. The threads of
the lifting screw for all models should be
well lubricated and kept free of grit, dirt, or
other abrasive contaminants. Fabric type
protective boots, or spiral steel protectors,
can be provided as an accessory to protect
the exposed portion of the lifting screw. In
the absence of positive stops, over-travel
may crush protective boots.
CAUTION
- Standard units should not be
operated at input speeds over 1,800 RPM
without consulting the factory. Machine
Screw Jacks are designed for a maximum
of two hours intermittent operation per
day. For values higher than two hours per
day, for any continuous operation, or for
repeated operation over any segment of
total travel, consult factory.
LUBRICATION
The jack gearboxes are partially filled with
a lubricant at the factory unless otherwise
specified. Before operating any unit, verify
lubricant presence. All jack housings are
furnished with a grease fitting(s) and/or
pipe plug(s).
Lubricant inspection is recommended at
regular intervals. Once every six months
is satisfactory under normal operating
conditions, unless experience indicates
that regreasing should occur at shorter or
longer intervals. Severe operating condi-
tions such as high duty cycles, high am-
bient temperatures, or contamination will
shorten the lubrication inspection interval.
Lubricate internal jack components utiliz-
ing the grease fitting(s)/Port(s). When ap-
plying grease to the gearbox housing, suf-
ficient grease pressure is required in order
to properly apply grease to the bearing(s)
and worm gear. When applied at the facto-
ry, lubricant is typically applied at 5,000psi.
When utilizing an off-the-shelf, general-
purpose grease gun or auto lubrication
system, care must be taken to ensure
proper amount of lubricant is dispensed.
Only a small amount of lubricant would be
required. The below table is the amount
of lubricant applied at the factory. When
adding lubricant to the jack housing do
not exceed the amount specified. See jack
nameplate for specific lubricant installed in
the gearbox, or consult factory.
The lubricant must not contain any grit or
dirt, abrasives or fillers. It should not pre-
cipitate sediment, nor separate at temper-
atures up to 280°F. The lubricant must also
have resistance to oxidation and must be
non-channeling. For operating conditions
outside these limits, consult factory.
