Final Drive Belt Tension Inspection - Triumph Thunderbird Handbook

Maintenance and Adjustment

Final Drive Belt Tension Inspection

Drive belt tension must be measured using
Triumph service tool T3880126, which is
available from your Triumph dealer.
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cfhc
Service Tool T3880126
1. Load scale - 4.5 kgf (10 lbf) mark
2. O-ring
3. Deflection slider
4. Deflection scale (0.5 mm (0.020 in)
increments)
5. O-ring
6. Belt cradle
7. Load scale (zero position)
Drive belt tension can be measured with the
motorcycle on the side stand, or if available,
on support stand T3880803 (available from
your Triumph dealer). The method of
measurement and adjustment is identical, but
the belt tension specification for each method
is different.
Drive belt tension must be measured with
the drive belt cold (at ambient tempertaure).
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Drive Belt Tension Specification
Motorcycle on
sidestand
Motorcycle on Support
stand T3880803
Drive belt tension is measured by applying a
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4.5 kilogram-force (kgf) (10 pound-force (lbf))
load to the plunger on service tool T3880126,
once it has been positioned to the lower run
of drive belt; this load then deflects the belt.
The belt deflection can then be measured
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using a scale on the tool.
1. 4.5 kilogram-force (10 pound-force)
applied to belt
2. Amount of deflection
5.5 to 7.0 mm
(0.20 to 0.27 in)
7.5 to 9.0 mm
(0.30 to 0.35 in)
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