Onan UF Series Instruction Manual And Parts Catalog page 38

I N S T A L L A T I O N
USE THIS TABLE ONLY FOR GENERATORS STAMPED 1800 RPM ON
THE GENERATOR NAMEPLATE.
The pulley sizes recommended in this table are approximate sizes only,
in 1/2" steps. The sizes shown do not include any allowance for belt
slippage. Belt slippage for flat belts may sometimes reduce the gener-
ator driven speed, under load, as much as 4 per cent.
To select a generator pulley size from the table, measure the DIA-
METER (not the distance around)of the driving pulley. Select the line
at the left side of the table for the driving pulley size. Follow this line
across to the speed column that is nearest to the recommended speed of
the driving pulley. The size in the square at this point is the approx-
imate siz e of the generator pulley which will be required. If the recom-
mended size pulley can not be obtained, select one size smaller pulley.
This will help to offset belt slippage. Adjust throttle or governor as
necessary to obtain proper speed.
Example:
If a 12 inch drive pulley operates at 1100 rpm, follow the 12 inch line
across to the 1100 rpm column. The generator pulley size at the point
of intersection is 7 inch. This example is outlined in heavy lines in the
table.
DRIVING P U L L E Y S P E E D IN REVOLUTIONS P E R MINUTE
DRIVING
P U L L E Y
S I Z E
600 700
GI
800 900 100oj/ilOCvjl20o| 130o|
SNERATOR P U L L E Y S I Z E REQUI
14001
R E D
15001
1800 1
16001
a.P.N
1700
I. G E I
1800
f E R A I
1900
roR)
2000
6
2 2
2i
3
3
[ * !
5
5
54 6
*
6
64
6*
2
2i
3
3i
U
5
5 54
6
64 64
7
7
2
ai
3
3i
h
5 5i 54
6
t>i
7
74
7£
2£
3
3
3i
k
5 54 54
6
64
7
74
8 8
8 2£ 3
3i
k
5 5i 6 64 7 74
8
84
9
8*
2£ 3
3i k
' 5
5i 6
64
7
74 8
64
9
94
9
3
3i 5
! 5 1
6 64
7
7i
8
84
9
94
10
9i
3
3i
k 5
5i/
6 64
7
8
&i 9
94
10 104
10
3*
k 5
5i
! 6 6i
7
74
8
9
94
10 104
11
10*
3i k
5i 5i
;
7
74
8 84
9
10 104 11
114
11
3*
k
5i 6
/ ^ ' i
T
8
84
9
94
10 11 114 12
h
5
5i 6
: 7 ' <
74 8
9
94 10 104 114
12
124
I l l l I I I I I I I
1 12
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h
I I I I I
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11 12 124
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12£
h
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7i 8
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114 124 13 134
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8 & 4
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lh 15
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lU 144
154
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114 15
16
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114
124
13
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15i
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6i
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104
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154
16
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6
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8
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164 174