SUTPHEN TOWERS, INC. 2012
Manual-2012
_SL75-SA75-SP70.docx
Page 36 of 55
8/31/2012
X 4 1/2" long-grade 8 with an SAE hardened washer under the head and a grade "C" lock nut.
These assemblies are factory-installed to a torque of 200-210 ft. lbs. and should be checked
every three (3) months. The heads of these bolts are accessible through two 3" diameter holes
in the turntable plate.
The turntable must be rotated for access to check all bolts. Any indication of loosening or bolt
failure should be reported to Sutphen Towers, Inc. for evaluation and disposition.
The person operating the turntable for bolt alignment must make sure all
persons and tools are free and clear before rotating turntable.
ATTACHMENT OF SUPPORT STRUCTURE TO TRUCK FRAME
Your vehicle was assembled with one of two methods of attaching the aerial support structure
to the chassis.
Method 1: Threaded Bolts
There are eight (8) bolt assemblies on each side of the tower support structure, four (4) front
and four (4) rear each side. These sixteen (16) assemblies are 3/4-10 X 2 1/2" long-grade 8
flange bolts with grade "C" lock nuts. The assemblies are factory-installed to a torque of 300-
325 ft. lbs. on the nut and should be checked every three (3) months. Any indication of
loosening or bolt failure should be reported to Sutphen Towers, Inc. for evaluation and
disposition.
Method 2: Huck Fasteners
There are twelve (12) fasteners on each side of the aerial support structure, six (6) front and six
(6) rear each side. These twenty-four (24) assemblies are 16mm Huck Bobtail Lockbolts. These
fasteners are factory installed with specialized equipment, and do not require retorquing. They
should be inspected every three months. Any indication of loosening or bolt failure should be
reported to Sutphen Towers, Inc. for evaluation and disposition.
Sutphen recommends that once a week the ladder be raised to full elevation,
full extension, and rotated 360 degrees in both directions.
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