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FINAL DRIVE
Demand 4 Operation - AWD Models
With the Polaris Demand 4 Drive System, the ma-
chine operates as a
2
wheel drive vehicle as long as
the front wheel rotational speed remains greater
than the front drive axle speed.
If
the rear wheels
lose traction and AWD is selected (button de-
pressed), the front wheel rotational speed will de-
crease, causing the front drive axle speed to exceed
front wheel speed. Restricting the rotation of the
drive clutch roller cage (2) (see Electric Hub Opera-
tion) will cause the rollers (3) to climb the ramps of
the cam (5), and become squeezed between the
ramps and the ring in the hub. See
III. 1.
When the demand
4
clutch assembly, wheel hub,
and drive axle are engaged, the front wheels will
drive and stay engaged until rear wheel traction is
regained.
When traction is regained, the front
wheels will overdrive the front drive axle, pushing
the clutch rollers (3) toward the lower part of the cam
(5), disengaging the Demand 4 clutch. The rollers
are held in place by the spring (4). See III. 2.
.&.
WARNING
It is important that the front and rear axle drive ratio
and tire size are not changed. Changing this ratio
III.
1
will cause erratic engagement, which could result in
serious injury or death.
Cam (5)
Electric Hub Engagement (4x4)
When AWD is selected in a forward gear,
current flows through a coil of wire located
in the strut housing, creating a magnetic
field. An armature plate (1) coupled to the
roller cage (2) is attracted to the magnetic
field, and resists rotation, creating drag on
the drive roller cage assembly.
This
causes the roller to climb the ramps of the
cam, engaging the hub. NOTE: In reverse
gear the override button must be pushed to
deliver power to the wheel coil. Electric
hub engagement offers an advantage over
mechanical systems. When the AWD but-
ton is switched off, the machine will have
the steering ease of a 2 wheel drive unit;
and with the switch turned on, 4 wheel
drive will be engaged whenever the rear
wheels lose traction.
1. Armature Plate
NOTE:
Armature plate is positioned with
tabs in round holes of cage.
2. Roller Cage
3. Roller
4. Garter Spring
5.
Cam
Tabs go into the round holes
Spacer
3
5
~
~
2
III. 2
Polaris Industries Inc.
7.3
7/96
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Troubleshooting
