Greensmaster 3150 Page 2 -- 3 Product Records and Maintenance
Torque Specifications
Recommended fastener torque values are listed in the
following tables.For criticalapplications,as determined
byToro,eithertherecommendedtorqueoratorquethat
is unique to the application is clearly identified andspe-
cified in this Service Manual.
Thesetorquespecificationsfortheinstallationandtight-
ening of fasteners shall apply to all fasteners which do
nothavea specificrequirementidentifiedinthisService
Manual.Thefollowingfactorsshallbeconsideredwhen
applying torque: cleanliness of the fastener, use of a
threadsealant(e.g.Loctite),degreeoflubricationonthe
fastener, presence o f a prevailing torque feature, hard-
ness of the surface underneath the fastener’s head or
similar condition which affects the installation.
Asnotedinthefollowingtables,torquevaluesshouldbe
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 en-
gagement, 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.
Measurethetorquerequired totightenthefasteneruntil
thelinesmatchup.
Fastener Identification
Figure 1
Grade 1 Grade 5 Grade 8
Inch Series Bolts and Screws
Figure 2
Class 8.8 Class 10.9
Metric Bolts and Screws
Using a Torque Wrench with an Offset Wrench
Useofanoffsetwrench(e.g.crowfootwrench)willaffect
torquewrench calibrationdue tothe effectivechange of
torque wrenchlength.When usinga torquewrenchwith
an offset wrench, multiply the listed torque recommen-
dation by the calculated torque conversion factor (Fig.
3) to determine proper tightening torque. Tightening
torque when using a torque wrench with an offset
wrench will be lower than the listed torque recommen-
dation.
Example: The measured effective length of the torque
wrench (distance from the center of the handle to the
center of the square drive) is 18”.
Themeasuredeffectivelengthofthetorquewrenchwith
the offset wrench installed (distance from the center of
the handle to the center of the offset wrench) is 19”.
The calculated t orque conversion factor for this torque
wrenchwith thisoffsetwrench wouldbe 18/19=0.947.
If the listed torque recommendation for a fastener is
from 76 to 94 ft--lb, the proper torque when using this
torque wrench with an offset wrench would be from 72
to 89 ft--lb.
Figure 3
(effective length of
torque wrench)
TORQUE CONVERSION FACTOR = A / B
A
B
(effective length of torque
Torque wrenchOffset wrench
wrench + offset wrench)
Product Records
and Maintenance
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