Torque Specifications; Identifying The Fastener - Toro Groundsmaster 4300-D Service Manual

Torque Specifications

Identifying the Fastener

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 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.
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Figure 4
Figure 5
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