Thern 5334 Series User manual

Read this Owner’s Manual
thoroughly before operating
the equipment. Keep it with
the equipment at all times.
Replacements are available
from Thern, Inc., PO Box 347,
Winona, MN 55987,
507-454-2996.
www.thern.com
Owner’s Manual
For
Series 5334
Portable Davit Crane
IMPORTANT: Please record
product information on
page 2. This information is
required when calling the
factory for service.
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Two-Year Limited Warranty
Thern, Inc. warrants its products against defects in material or workmanship for two years from the date of purchase
by the original using buyer, or if this date cannot be established, the date the product was sold by Thern, Inc. to the
dealer. To make a claim under this warranty, contact the factory for an RGA number. The product must be returned,
prepaid, directly to Thern, Inc., 5712 Industrial Park Road, Winona, Minnesota 55987. The following information
must accompany the product: the RGA number, the date of purchase, the description of the claimed defect, and a com-
plete explanation of the circumstances involved. If the product is found to be defective, it will be repaired or replaced
free of charge, and Thern, Inc. will reimburse the shipping cost within the contiguous USA.
This warranty does not cover any damage due to accident, misuse, abuse, or negligence. Any alteration, repair or
modication of the product outside the Thern, Inc. factory shall void this warranty. This warranty does not cover any
costs for removal of our product, downtime, or any other incidental or consequential costs or damages resulting from
the claimed defects. This warranty does not cover brake discs, wire rope or other wear components, as their life is
subject to use conditions which vary between applications.
FACTORY AUTHORIZED REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE
EXCLUSIVE REMEDY TO THE CONSUMER. THERN, INC. SHALL NOT BE LIABLE FOR ANY INCIDENTAL
OR CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY ON THIS
PRODUCT. EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW, ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ON THIS PRODUCT IS LIMITED IN
DURATION TO THE DURATION OF THIS WARRANTY.
Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on
how long an implied warranty lasts, so the above limitation or exclusion may not apply to you. This warranty gives
you specic legal rights, and you may also have other rights which vary from state to state.
Note: Thern, Inc. reserves the right to change the design or discontinue the production of any product without
prior notice.
About This Manual
The Occupational Safety and Health Act of 1970 states that it is the employer’s
responsibility to provide a workplace free of hazard. To this end, all equipment
should be installed, operated, and maintained in compliance with applicable trade,
industrial, federal, state, and local regulations. It is the equipment owner's respon-
sibility to obtain copies of these regulations and to determine the suitability of the
equipment to its intended use.
This Owner’s Manual, and warning labels attached to the equipment, are to serve
as guidelines for hazard-free installation, operation, and maintenance. They
should not be understood to prepare you for every possible situation.
The information contained in this manual is applicable only to the Thern Model
5334M1 Portable Davit Crane. Do not use this manual as a source of information
for any other equipment.
The following symbols are used for emphasis throughout this manual:
Failure to follow ‘WARNING!’ instructions may result in equipment damage,
property damage, and/or serious personal injury.
Failure to follow ‘CAUTION!’ instructions may result in equipment damage,
property damage, and/or minor personal injury.
Important!
Failure to follow ‘important!’ instructions may result in poor performance of
the equipment.
Please record the following:
Date Purchased:
Crane Model No.:
Crane Serial No.:
If sold with a winch:
Winch Model No.:
Winch Serial No.:
This information is required when
calling the factory for service.

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Suggestions for Safe Operation
DO the following:
Read and comply with the guidelines set forth in this Owner’s Manual. Keep
this manual, and all labels attached to the crane, readable and with the equip-
ment at all times. Contact Thern, Inc. for replacements.
Check lubrication before use.
Install the wire rope securely to the winch drum.
Keep at least 4 wraps of wire rope wound on the drum at all times, to serve as
anchor wraps. With less than 4 wraps on the drum the wire rope could come
loose, causing the load to fall.
Keep hands away from sheaves, gears, wire rope, and other moving parts of
the equipment.
Disconnect the power before servicing the equipment.
Keep all unnecessary personnel away from the crane while in operation. Keep
out of the path of the load, and out of the path of a broken wire rope that
might snap back and cause injury.
DO NOT do the following:
Do not lift people, or things over people. Do not walk or work under a load or
in the line of force of any load.
Do not exceed the load rating of the crane or any other component in
the system. To do so could result in failure of the equipment.
Do not use more than one crane to move a load that exceeds the load rating of
a single crane. A shift in load weight could overload the equipment.
Do not use damaged or malfunctioning equipment. To do so could result in
failure of the equipment.
Do not modify the equipment in any way. To do so could cause
equipment failure.
Do not wrap the wire rope around the load. This damages the wire rope and
could cause the load to fall. Use a sling or other approved lifting device.
Do not operate the crane with guards removed or improperly installed.
Do not divert your attention from the operation. Stay alert to the possibility of
accidents, and try to prevent them from happening.
Do not jerk or swing the load. Avoid shock loads by starting and stopping the
load smoothly. Shock loads overload the equipment and may cause damage.
Do not remove the winch or other components from the crane, and do not use
these components for any use other than for their original intended function.
Do not use the crane to drag or pull loads. This will create side pulls which
could damage the equipment or cause the load to tip.
Do not leave a suspended load unattended. Place the load on the ground if it
must be left unattended.
Do not adjust the winch brake with the load suspended.

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Important!
• A qualied professional should
inspect or design the founda-
tion to insure that it will provide
adequate support.
• Locate the crane so it will be vis-
ible during the entire operation.
1.1 Installing the Crane
Do not install the crane in an area dened as hazardous by the National Elec-
tric Code, unless installation in such an area has been thoroughly approved.
Do not install the crane near corrosive chemicals, ammable materials, ex-
plosives, 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 unlevel surface may cause
the boom to rotate in the direction the mast is leaning.
1.1.4 FASTEN THE BASE securely to the foundation.
a FOR STANDARD PRODUCTS referred to in this manual, use 5/8 inch
coarse thread fasteners, grade 5 or better, torqued dry to 150 ft-lbs without
lubrication. Make sure mounting holes are secured to a solid foundation able
to support the crane and the load under all conditions with design factors
based on accepted engineering practices.
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 PROFES-
SIONAL TO OBTAIN PROPER STRUCTURE OR FOUNDATION SPECI-
FICATIONS FOR THE MOUNTING OF THERN PRODUCTS.

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Important!
• Inspect the crane during assem-
bly according to the Instructions
for Periodic Inspection. This will
give you a record of the condition
of the crane with which to com-
pare future inspections.
• Save all boxes and crates that the
crane was shipped in, use them
again if you need to repackage
the crane.
• Contact the factory immediately
if any parts are missing or dam-
aged.
• Do not overtighten fasteners, this
may strip threads or cause dam-
age to other parts.
1.2 Assembling the Crane
1.2.1 STUDY PARTS DRAWINGS to understand how the crane is assembled. See
page 17.
1.2.2 LUBRICATE PINS and other components prior to assembly. Refer to the
Lubrication Instructions.
1.2.3 INSTALL THE BASE then assemble the crane in the following order.
a INSTALL THE MAST in the base.
b INSTALL THE GRAB HOOK between the upper mast ears using the spacer
and fasteners provided. Make sure the hook opening faces up. See gure 2.
c INSTALL THE BOOM SWIVEL, see figure 2.
• PLACE THE BUSHINGS in the boom swivel and position this assembly
between the lower mast ears. Make sure the swivel is positioned correctly.
• INSERT FASTENERS and tighten until cotter pins can be inserted. Make
sure cotter pins are locked in the slots of the hex nuts.
d INSTALL THE BOOM in the boom swivel using the pin provided. Make
sure the boom is positioned correctly, and install the boom extension.
e ATTACH ONE END OF THE LOAD CHAIN to the boom extension and the
other end to the grab hook. Avoid twisting the chain and make sure it is
seated in the saddle of the hook. See gure 2.
f INSTALL THE SHEAVE using the pins provided.
g INSTALL THE WINCH using the fasteners provided. Make sure the winch
is positioned correctly.
1.2.4 COMPLETE ASSEMBLY.
a MAKE SURE ALL FASTENERS are tightened, and cotter pins properly
bent to secure them in place, see gure 1.
b LUBRICATE THE ENTIRE CRANE.
c INSTALL THE WINCH HANDLE according to the instructions in the
Winch Owner’s Manual.
d INSTALL THE WIRE ROPE according to the instructions in the Winch
Owner’s Manual.
Figure 2 – Crane Assembly
spacer hook opening
faces up
chain link
turned sideways
and seated in
saddle of hook
ange on
underside
side holes
in boom
swivel
positioned
down
boom
pin
ange between
boom swivel and
mast ear
Figure 1 – Cotter Pins
bend arms back