HUSQVARNA 235R
Three-shoe
,
loop
-
spring
clutch
threads
anta
crankshaft
.
STIHL FS-76
Two-shoe
,
two-spring
clutch
threads
anta
crankshaft.
/
Powdered
\
,1"
metal
body.
ECHO SRM-3400
ECHO SRM-2400
Two
-
shoe
,
two
-
spring
clutch
threads
f3J
anta
crankshaft
.
~AhM
I
'""
SHINDAIWA T230
.
Two-shoe
,
single-
Two-shoe
,
single-spring
spring
clutch
clutch
mounts
to
flywheel
.
mounts
to
Powdered
flywheel
.
metal
body.
/
Powdered
metal
body.
SHINDAIWA T350
Four
-
shoe
,
four
-
spring
clutch
mounts
to
flywheel
.
."
compression
springs.
DRIVE
eLureRES
Vital
Concerns:
• Do clutch shoes have
a broad surface area for
positi
ve
engagement
and long wear?
•
Is
t
he
clutch body
made from heat and
wear -resistant
powdered metal?
• Is the clutch mounted
to t
he
flywheel for better
crankshaft security and
ease of service? Or, is
it
attached to t
he
end of
the crankshaft?
• Are clutch parts
scaled to match the
loads applied by differ-
ent displacement
engines?
Analysis:
Specilicafions:
Shindaiwa T230 / T260 / T270 / T350
AI
I but the T350 have two-shoe, single spring clutches
with bonded surface and 1,692 sq. mm average
contact area. T350 sports heavy-duty four-shoe clutch
(1
,760
sq.
mm) with hookless compression springs
AI
I are flywheel-mounted and made of powdered meta
l.
Echo SRM-2400 / SRM-3100S / SRM-3400
SRM-2400 has two-sh
oe,
two-spring clutch. SRM-3100S
and SRM-3400 have two-shoe, one-spring type.
Average contact area is 1,780
sq
. mm.
SRM-2400 mounts to crankshaft, others
to
flywheel.
AII
have cast zinc a
ll
oy bodies and bonded shoes.
Husqvarna 225L / 232L / 235R
225L and 232L have two-shoe, two-spring, clutches. 235R
has three-shoe, single loop spring designo Average
contact area
is
1,464
sq
. mm. Shoes are not bonded .
AII
have powdered metal bodies and mount to crankshaf
t.
Stihl FS-76 / FS-88 / FS-108
FS-76 and FS-88 have two-shoe, two-spring clutches.
FS-
108
is
two-shoe, one-spring type.
AII
have bonded
shoes with 1,513 sq . mm average contact area.
FS-76 mounts to crankshaft, others to flywheel.
AI
I made
of cast zinc a
ll
oy.
AII
Shindaiwa clutches are made of powdered metal, a material that can
wi
t
hs
tand t
he
high, friction-caused heat, and wear applied by extension spri
ng
hooks.
Shindaiwa clutch shoes are among the most ample
in
surface area, assur-
ing smoo
th
, positi
ve
engagement and long l
ife.
To avoid spring
wear
altogether, Shindaiwa's T3S0 clutch is fitted with
hookless compression springs- a better idea
l
ar
big engines and heavy-duty usage .
Unlike the competition, every Shindaiwa model has a Ilywheel-mounted
clutch for easier service and better engine security than the crankshaft-mounted type.
1?
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