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Spring Rate
Spring Compo
Spring Length
No.
Color
Part No.
(Ib/in.)
(@ 1.25 in.)
(No Load)
Coils
Code
LIGHT
0146-065
22.5 - 27.5
67.5 - 87.5 Ib
4.35 in.
-+-
0.25
5.1
White
t
0146-313
43
70 - 84 Ib*
4.00 in.
+
0.100
5.15
Red
0146-067
45 - 53
145 - 165 Ib
4.35 in.
+
0.187
5.35
Yellow
0146-005
54 - 62
170-190Ib
4.34 in.
+
0.156
5.2
Unpainted
HEAVY
0146-068
60 - 66
123 - 137 Ib*
4.35 in.
+
0.156
5.0
Green
Drive Clutch
Theory
General
The quick change characteristics of the Arctic
hexagonal shaft drive clutch make it particularly
well suited for adjustment. Only three socket
head cap screws hold the cover plate in place.
Removal of these and the cover plate allows easy
access to all internal components. Ramps can be
easily changed with a hex key wrench. An easy-
to-remove nut and bolt hold the round weights in
place at the ends of the spider arms. The large
spring space inside the housing allows for
flexibility in spring design and size.
Spring Chart
Spring
The primary function of the spring is to control
engagement speed. At idle, the spring keeps the
clutch sheaves apart. However, as the throttle is
*at 2.187 in.
81
The Arctic drive clutch has three variable
components -
the spring, ramps and the
weights. All work together to provide the specific
engagement speed and shifting characteristics of
the clutch.
Fig. 6-1
0725-060
opened and engine rpm increases, centrifugal
force eventually overcomes the force of the
spring and the rollers and weights on the spider
arms move outward on the three ramps. This
brings the moveable sheave toward the stationary
sheave, and, when the moveable sheave begins to
squeeze the drive belt between itself and the
stationary sheave, drive clutch engagement takes
place. Therefore. drive clutch engagement speed
is increased or decreased depending on the
spring rate. A light spring allows the clutch to
engage sooner (lower rpm) than a heavy spring.
The chart below provides the specifications of the
springs used by Arctic Enterprises.
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