BRP ski-doo MACH Z 1000 SDI, Руководство пользователя

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06-30
MMC2005-001_06A.FM
SECTION 06 - DRIVE SYSTEM
EFFECTS OF THE DRIVEN PULLEY
SPRING
The driven pulley spring is needed to keep the
plastic slider buttons in contact with the cam and
to provide enough side force on the belt in the low
gear position to allow initial acceleration while the
torque rises to a point where the torque sensing
cam begins to take over. At full load, the driven
pulley spring has much less effect on the driven
pulley shifting sequence than does the cam, espe-
cially at low shift ratios. At the part throttle loads
at low ratios, the spring has the main effect on the
shift characteristics of driven pulley.
Increases in the driven pulley spring preload will
bring the engine speed up before the pulley starts
shifting and will help backshift the clutch quicker.
Decreasing the preload will allow a faster upshift
but a slower backshift thus lowering the engine
RPM.
NOTE: Control of the engine speed is done by cal-
ibrating the engine pulley not by adjusting the driv-
en pulley spring preload. An attempt to lower the
engine RPM by decreasing the spring preload in
the driven pulley will result in belt slippage on ac-
celeration. An attempt to increase engine RPM by
increasing the preload will result in excessive drive
belt wear and decreased efficiency in the trans-
mission.
The driven pulley spring preload is listed in the ba-
sic specifications for all our machines. This preload
tension will vary from 4 kg (9 Ib) to 7.5 kg (17 Ib)
on models equipped with the TRA clutch.
The preload figure given in our specifications is
quoted in kg (Ib) of force for each machine, not in
inch-pounds or foot-pounds of torque. A figure giv-
en in units of torque would require multiplying the
radius of the pulley by the pull recorded on the
scale. Our figures are quoted for each pulley size
and it is only necessary to record the pull of the
spring by attaching a scale to the rim of the pulley.
The scale must be positioned at 90° to the radius
of the pulley. Holding the fixed half of the pulley
still, pull until the sliding half just begins to rotate.
At this point, read the scale.
TYPICAL
1. Spring scale hook (P/N 529 030 900)
To change the spring tension, relocate the spring
end in the sliding pulley half or reposition the
spring end in the cam.
There are six holes available on a Formula cam.
They are numbered 1-6. Most Formula driven pul-
leys have three adjustment holes in the sliding
half. They are lettered A, B, C. When adjusting
driven pulley tension, always refer to the tension
in kg (Ib) — not B-6 or A-5 hole positions for accu-
racy and repeatability. Moving the spring from one
numbered hole to a hole adjacent will change the
preload by 1.35-1.8 kg (3-4 Ib). Remember, use
the number and letters as references — measure
the tension for accuracy. By using various combina-
tions, the preload is adjustable from 5 to 35 pounds
(depending on spring type).
The charts below will give an approximate refer-
ence for each spring position. It will vary with dif-
ferent springs and cam angles.
A01B18B
1