Torque Specifications; Calculating The Torque Values When Using A Drive-Adapter Wrench - Toro Greensmaster 3120 Service Manual

Torque Specifications

Calculating the Torque Values When Using a Drive-Adapter Wrench

Specifications and Maintenance: Torque Specifications
The recommended fastener torque values are listed in the following tables. For
critical applications, as determined by Toro, either the recommended torque or a
torque that is unique to the application is clearly identified and specified in this
Service Manual.
These torque specifications for the installation and tightening of the fasteners will
apply to all the fasteners which do not have a specific requirement identified in
this Service Manual. The following factors must be considered when applying
the torque: cleanliness of the fastener, use of a thread sealant (e.g., Loctite),
degree of lubrication on the fastener, presence of a prevailing torque feature
(e.g., Nylock nut), hardness of the surface underneath the head of the fastener,
or similar condition which affects the installation.
As noted in the following tables, the torque values should be reduced by
25% for the lubricated fasteners or fasteners with a wet thread locking
compound applied to achieve the similar stress as a dry fastener. The torque
values must be reduced when the fastener is threaded into the aluminum or
brass. The specific torque value should be determined based on the aluminum
or brass material strength, fastener size, length of thread engagement, etc.
The standard method of checking the torque can be performed by marking a line
on the fastener (head or nut) and mating part, then back off the fastener 1/4
of a turn. Measure the torque necessary to tighten the fastener until the lines
match up.
g205924
1. Torque wrench
2. Drive-adapter wrench (crowsfoot)
Using a drive-adapter wrench (e.g., crowsfoot) in any position other than 90º and
270º to the frame of the torque wrench will affect the torque value measured by
the torque wrench because of the effective length (lever) of the torque wrench
changes. When using a torque wrench with a drive-adapter wrench, multiply the
listed torque recommendation by the calculated torque conversion factor; refer
to Figure 4 to determine proper tightening torque. When using a torque wrench
with a drive-adapter wrench, the calculated torque will be lower than the listed
torque recommendation.
Example: The measured effective length of the torque wrench (A = distance from
the center of the handle to the center of the square drive) is 457 mm (18 inches).
The measured effective length of the torque wrench with the drive-adapter
wrench installed (B = distance from the center of the handle to the center of the
drive-adapter wrench) is 483 mm (19 inches).
Figure 4
Torque Conversion Factor = A / B
3. A (effective length of torque wrench)
4. B (effective length of torque wrench and
drive-adapter wrench)
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