Terex RT700 - Torque Wrench Extensions Usage

In some applications, a standard torque wrench and socket
cannot be fitted to the bolt (s) to be tightened because of
restricted access. In other instances, the torque value speci-
fied cannot be obtained because sufficient force cannot be
applied to the standard length wrench. Both of these prob-
lems may be solved by the use of appropriate torque wrench
extensions - either commercially made or fabricated by the
user.
When using an extension, it must be remembered that the
wrench torque (the actual torque reading or setting of the
wrench) and the wrench force (the force applied to the
wrench) must be adjusted to compensate for the added length
and produce the desired bolt torque.
Refer to the illustration and formula below when calculating
the proper adjusted values for wrench torque, wrench force
and bolt torque.
NOTE: If the Torque wrench setting at length “B” would be
600 ft. lb. (813 NM) for capscrews not requiring us
of adapter, then the following shows the use of an
adapter and the calculation for that setting.
FORMULA
Torque wrench (600 ft. lb.) times (“B”)
setting (TWS)
=
(“B”) plus (“A”)
= lpq -Plw
EXAMPLE
A = 10.25”
B = 43”
TWS = (600 FT.LB.) X 43
42 + 10.25
= 2580
53.25
= 485 FT. LB.
Issued: August 2003
A
B
TORQUE WRENCH EXTENSIONS
SERVICE AND ADJUSTMENTS
6 - 16RT700 Series