Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 4
A11577I-0617
1.1
Installing the Crane
Do not install the crane in an area defined as hazardous by the National Electric
Code, unless installation in such an area has been thoroughly approved.
Do not install the crane near corrosive chemicals, flammable materials,
explosives, or other elements that may damage the crane or injure the
operator. Adequately protect the crane and the operator from such elements.
Position the crane so the operator can stand clear of the load, and out of the
path of a broken wire rope that could snap back and cause injury.
Attach the crane to a rigid and level foundation that will support the crane
and its load under all load conditions, including shock loading.
1.1.1
CONSULT APPLICABLE CODES AND REGULATIONS for specific rules
on installing the equipment.
1.1.2
LOCATE THE CRANE in an area clear of traffic and obstacles that could
interfere with operation. Make sure the crane is accessible for maintenance
and operation.
1.1.3
INSTALL THE CRANE on a level surface.
An uneven surface may cause
the boom to rotate in the direction the mast is leaning.
1.1.4
FASTEN THE BASE securely to the foundation to withstand applicable
overturning moments and mounting bolt reaction. See Table 1.
a
FOR STANDARD PRODUCTS referred to in this manual, use:
• 5PA5 - 1/2 in. coarse thread fasteners, Grade 5 or better. Recommended
torque without lubrication is 75 ft-lb.
• 5PA10 - 5/8 in. coarse thread fasteners, Grade 5 or better. Recommended
torque without lubrication is 150 ft-lb.
Refer to manufacturer’s instructions for other fastener types with
specific torque or installation instructions.
b
NON-STANDARD PRODUCTS that vary from the original design may
have different fastening requirements. Contact a structural engineer or Thern,
Inc. for this information.
TO COMPLY WITH LOCAL CODES, CONTACT A QUALIFIED
PROFESSIONAL TO OBTAIN PROPER STRUCTURE OR FOUNDATION
SPECIFICATIONS FOR THE MOUNTING OF THERN PRODUCTS.
Table 1 - Crane Reactions
2
Pedestal Base
Wall Mount Base
Crane
Model
Mast
Moment
Suggested
Bolt Size
Axial Force
per Bolt
1
Axial Force
per Bolt
1
Shear Force
per Bolt
5PA5
9,410 in-lbs
1,064 N-m
1/2 inch (M12)
880 lbs
3,915 N-m
680 lbs
3,025 N
540 lbs
2,403 N
5PA10
32,730 in-lbs
3,699 N-m
5/8 inch (M16)
1,380 lbs
6,139 N-m
1,280 lbs
5,694 N
1,060 lbs
4,716 N
1 Force in tension.
2 This information may change without prior notice. It is the responsibility of the installer and/or end user to ensure the most current
information is used.
Important!
• A qualified professional should
inspect or design the foundation
to insure that it will provide
adequate support.
• Locate the crane so it will
be visible during the entire
operation.
