For
Better
PTO
Shaft
and
Gearbox
Operation
A
proper
initial
installation
will
give
you
years
of
satisfactory
service
on
your
equipment.
Please
read
carefully,
following
instructions
which
have
been
specially
made
to
help
you
and
make
you
satisfied
with
your
purchase.
Warning!
Unfortunately,
snowblowers
will
be
faced
with
forgotten
or
hidden
objects
under
the
snow,
such
as:
chain,
tires,
stones,
pieces
of
wood,
etc.
In
spite
of
all
our
efforts,
machines
are
not
built
to
resist
all
those
conditions.
Danger: Too big tractors
It is dangerous to use a tractor that is too big or too powerful. The tractor will always be able to
overload the blower, even if the machine is already at maximum capacity. Tractor being very
high, too large angles at PTO universal joints will result, and the life of the universal joints will
be shortened dramatically.
P T O Shaft angles
PTO shafts are made to transmit power with angle at universal joints. However these
angles should be kept to a minimum. Larger angles shorten the life of PTO. Take for example a
snowblower sold for a tractor horse-power of 60-75 HP which would be attached to a 60HP
tractor operating at maximum capacity of (60HP continuous).
HP
PTO angles
Estimated life in hours
60@540 RPM
5°
450 hours
10°
195 hours
15°
90 hours
20°
40 hours
25°
20 hours
How to determine PTO angle
A =
PTO height at tractor
B
= PTO height at blower
C
= A-B
L
= Cross center distance in working position
1)
Lower
blower
on
ground
2)
Measure
A,B
and
L
3)
Subtract
B
from
A
(A-B=C)
4)
Divide
L
by
C
(L/C=F
50
Compare
F
Factor
in
the
table
below
to
find
PTO
angle.
(Interpolate
if
necessary)
F Factor
Angle
6
10°
3.75
15°
2.75
20°
2.15
25°
1.75
30°
PTO Installation Instructions for Snowblower
22
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