Service Manual
SPECIFICATIONS & MAINTENANCE
2-2
Toro Single Stage Snow Service Manual
Torque Specications
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 identied and specied
in the service manual.
These torque specications for the installation and
tightening of fasteners shall apply to all fasteners which
do not have a specic requirement identied 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
®
), 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 specic 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.
Fastener Identication
A
A
B
B
C
Inch Series Bolts and Screws
(A) Grade 1 & 2
(B) Grade 5
(C) Grade 8
Metric Bolts and Screws
(A) Class 8.8
(B) Class 10.9
8.8 10.9