Torque Specifications - Toro 22317 Service Manual

Torque Specifications

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 the service manual.
These torque specifications for the installation and
tightening of fasteners shall apply to all fasteners which
do not have a specific requirement identified in the
service manual. The following factors shall be consid-
ered when applying torque: cleanliness of the fastener,
use of a thread sealant (Loctite), degree of lubrication
on the fastener, presence of a prevailing torque feature,
hardness of the surface underneath of the fastener's
head, or similar condition which affects the installation.
As noted in the following tables, torque values should
be reduced by 25% for lubricated fasteners to achieve
the similar stress as a dry fastener. Torque values may
also have to be reduced when the fastener is threaded
into 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 verifying torque shall be per-
formed by marking a line on the fastener (head or nut)
and mating part, then back off fastener 1/4 of a turn.
Measure the torque required to tighten the fastener until
the lines match up.
Toro Wheeled CUL Service Manual
SPECIFICATIONS
Fastener Identification
Inch Series bolts and Screws
(A) Grade 1 & 2
(B) Grade 5
Metric Bolts and Screws
(A) Class 8.8
(C) Grade 8
(B) Class 10.9
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