SECTION 3 -- FIELD OPERATION
3--18
TWO and THREE--SPEED P.T.O. SYSTEMS
General Information
Generally speaking, P.T.O. driven equipment not
having a high power requirement is designed to run
at 540 P.T.O. rev/min and will have a 6--spline female
coupling. A P.T.O. shaft speed of 540 rev/min is
obtained at an engine speed of 1970 rev/min.
Equipment having a high power requirement is
designed to operate at 1000 P.T.O. rev/min and will
be provided with a 21--spline female coupling. With
the 21--spline shaft installed, run the engine at 2120
rev/min to provide a P.T.O. speed of 1000 rev/min.
Equipment that requires very low power to operate
may be run in the alternative P.T.O. speed range at
a lower engine speed with a consequent reduction in
fuel consumption and engine wear.
T ractors with 3--speed P.T.O. have the advantage of
running low power 540 P.T.O. driven equipment at a
reduced engine speed by selecting 540E on the
lever . See page 3--24 for P.T.O. and engine speeds.
IMPORTANT: Implements with a high power
requirement should be operated with the 1000
rev/min. P.T.O. (21--spline shaft). If it is necessary to
use the 6--spline shaft (at 540 rev/min.) to operate
implements having a power requirement of more
than 75 horsepower, then it is strongly
recommended that the implement is fitted with a slip
clutch to avoid damage to the P.T.O. output shaft and
other tractor components.
NOTE: When required, change the P.T.O. shaft to
suit the operation and equipment in use, as
described under ‘Changing the P.T.O. Output Shaft’
on page 3--31 .
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