JLG TOUCAN 1010, Руководство по обслуживанию

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45
Models
Edition 04-2006
Toucan 1010
5.13. Fasteners and torque values
Use bolts of the correct length. A bolt that is 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.
Threads can be damaged. Inspect them and replace
fasteners as necessary.
Torque values should correspond to the type of bolts,
studs and nuts being used unless otherwise noted.
Torque tables are provided by JLG for reference when
preforming maintenance.
Use of proper torque values is extremely important.
Improper torquing can seriously affect performance
and reliability.
NOTE
Some special applications require variation
from standard torque values. Reference
should always be made to component
overhaul procedures for recommendations.
Special attention should be given to the existence of
lubricant, 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, check the thread with
a gauge and then replace the bolt.
If reusing previously installed grade 10.9 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 or reworked.
It is mandatory to replace systematically ALL washers,
bolts and nuts of turntable bearing if they were removed
(even if bolts have not been over torqued).
All lower grade fasteners must also be properly
tightened to assure a good assembly. This tightening
can be achieved by using a procedure (such as the
turn-of-the-nut) or by applying the measured torque.
When unfinished self-locking nuts (such as the plas-
tic patch or dimpled types) are coated with a light oil,
the run down torque that would normally be added to
the wrench setting need not be added. Run down
torque is the force necessary to turn the nut on a free
thread.
When referring to applicable torque charts, use va-
lues 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 ex-
cessiv e 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 be either
overstressed or damaged, it should immediately be
removed from service until recalibrated.
MAINTENANCE 5 5