Torque Specifications - Toro Power Clear 621 Service Manual

SPECIFICATIONS & MAINTENANCE

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 (e.g. Loctite
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.
2-2
), degree of lubrication on the
®
Fastener Identification
A
Inch Series Bolts and Screws
(A) Grade 1 & 2
(B) Grade 5
(C) Grade 8
8.8
A
Metric Bolts and Screws
(A) Class 8.8
(B) Class 10.9
Toro Single Stage Snow Service Manual
C
B
10.9
B