INSTALLATION
INSTRUCTIONS
FOR
SNOWBLOWER-cont’d
P.T.O.
SHAFT
ANGLES
Previous
examples
clearly
demonstrate
that
universal
joint
angle
is
directly
related
with
life
of
P.T.O.In
order
to
reduce
angle,
it
is
necessary
to
increase
the
distance
between
snowblower
and
tractor
H.P.
P.T.O.
angles
Estimated
life
in
hours
60@540
RPM
Using
#50
PTO
5
°
°
10
°
°
15
°
°
20
°
°
25
°
°
450
hours
195
hours
90
hours
40
hours
20
hours
HOW
TO
DETERMINE
P.T.O.
ANGLE
A=P.T.O
height
at
tractor
B=P.T.O
height
at
blower
L=Cross
center
distance
in
wo rking
position
C=A-B
A
A
L
L
B
B
C
1)
Lower
blower
on
ground.
2)
Take
measures
A,B
and
L
3)
Subtract
B
of
A
(A-B
=
C)
4)
Divide
L
by
C
(L/C
=
F)
5)
Compare
F
Factor
in
table
to
find
P.T.O.angle(interpolate,
if
necessary).
F
FACTOR
ANGLE
20
°
°
10
°
°
15
°
°
25
°
°
30
°
°
6
2.75
3.75
2.15
1.75
P.T.O.
Shafts
are
made
to
transmit
power
with
angles
at
universal
joints.
However,
these
angles
should
be
kept
to
a
minimum.
Larger
the
angle,
shorter
the
life
of
P.T.O.
Take
for
example
a
snowblower
sold
for
a
tractor
capacity
of
60-70
H.P.,
Which
would
be
attached
to
a
60
H.P.
Tractor,
operating
at
maximum
capacity
(60
H
.
P
.
Continuous).
Too
Large
Angles
at
P.T.O.
Joints
AVOID
ACCEPTABLE
Reasonable
Angles
at
P.T.O.
Joints
Transmission
size
H.P.
540
R.P.M.
Joint
Angle
Life
expectency
(in
hours)
10
20
30
40
50
60
70
80
90
10
20
30
40
50
60
70
80
90
100
110
120
540
35
°
35
°
15
°
15
°
30
°
30
°
25
°
25
°
20
°
20
°
10
°
10
°
5
°
5
°
10
20
30
40
50
60
80
100
150
200
250
400
500
700
1000
1500
2000
2500
3000
3500
4000
5000
300
EX:Transmissionn
size
60
for
60
H.P.
@
540
R.P.M.
with
joint
angle
of
10”
will
have
an
expected
life
of
670
hours.
This
table
is
valid
only
for
540
R
.
P
.
M
.
3
