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Determining Torque Setting
There are several methods of determining the correct
setting on the torque wrench when using a crowfoot. All
of the methods involve making the setting proportional
to the effective change in length of the wrench multiplied
by the desired final torque.
Figure 2-14. Measurements Needed
L = Distance from center of torque wrench handle to the
center of socket drive
E = Distance from center of socket drive to the center of
crowfoot
LA = Distance from center of torque wrench handle to
the center of crowfoot
LH = Distance from center of torque wrench handle to
the center of crowfoot, when mounted at 90°
TD = Desired torque at the fitting
TS = Torque setting indicated on wrench
LeeBoy Model 695 Motor Grader
L
E
LA
Information and Specifications
Equations
Equation 1
Torque setting if the crowfoot is placed in line with
respect to the wrench:
TS = TD * L / LA
OR
TS = TD * L / (L+E)
Equation 2
Torque setting if the crowfoot is placed at 90° with
respect to the wrench
TS = TD * L / LH
OR
TS = TD * L / √(L
Equation 3
To estimate the crowfoot size (E)
E = Drive Size * 0.5 + Distance between
Drive & Open End + Wrench Size * 0.5774
+ E
)
2
2
2 2 2
2-19
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