Fasteners And Torque Values - JLG TOUCAN DUO Service Manual

III-10

3.10 Fasteners and torque values

Use bolts of the correct length. In a blind hole, a bolt
too long may bottom before the head is tight against
the part it is to hold.
If a bolt is too short, there may not be enough threads
engaged to hold the part securely.
Thread can be damaged. Inspect them at each
disassembly, and replace fasteners as necessary.
Torque values should correspond to the type of bolts,
studs and nuts used (refer to torque values table,
§ 3.11).
The torque value tables are provided by JLG for
reference when performing maintenance.
Use of proper torque values is extremely important.
Improper torquing can seriously affect performance
and reliability.
NOTE
Some special applications require variation
from the standard torque values. Reference
should always be made to component
overhaul procedures for recommendations.
Special attention should be given to the existence of
lubricants, plating, or other factors that might require
variation from standard torque values.
When maximum recommended torque values have
been exceeded, the fastener should be replaced. If
installation is in a tapped hole, the thread shall be
checked with a gauge and the bolt replaced.
Models
Updated 06-2015
GENERAL
TOUCAN Duo
If reusing previously installed bolts that have not been
over torqued, the bolts shall be visually inspected for
cracks and thread damage, and replaced if
discontinuities are found. Bolts are not to be
rethreaded, rewelded or reworked.
All lower grade fasteners must be properly tightened
to ensure correct assembly. This tightening can be
achieved by applying a measured torque.
In order to respect proper torque values, lock nuts
must be free from grease
When referring to the applicable torque charts, use
values as close as possible to the torque values shown
to allow for wrench calibration tolerance. An erratic or
jerking motion of the wrench can easily result in
excessive torque. Always use a slow wrench
movement and stop when the predetermined value
has been reached.
Torque wrenches are precision instruments and are
to be handled with care to ensure calibrated accuracy.
Calibration checks should be made on a scheduled
basis. Whenever the wrench might either be
overstressed or damaged, it should immediately be
removed from service and recalibrated.
Know your torque wrench! Flexible beam type
wrenches, even though they might have a preset
feature, must be pulled at right angles and the force
must be applied at the exact center of the handle.
Force value readings must be made while the tool is
in motion. Rigid beam type wrenches are available
with a limited and preset torque feature but values
are not displayed.
NOTE
When multipliers and/or special tools are
used to reach hard to get at spots, ensure
torque readings are precisely calculated.
Identification of fastener grade is always
necessary. When marked as a high strength
bolt (i.e. grade 8.8, 12.9, etc. ), the mechanic
must be aware that he is working with highly
stressed component and the fastener should
be torqued accordingly.
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