All Wheel Drive Operation - Polaris 2012 RANGER RZR 570 INTL Service Manual

All Wheel Drive Operation

The AWD switch may be turned on or off while the vehicle
is moving, however, AWD will not enable until the engine
RPM dr ops be low 3100. Once the A WD is enabled, it
remains enabled until the switch is turned off.
Engage th e A WD switch befor e ge tting into conditions
where the fr ont wheel d rive may b e needed. If the rear
wheels are spinning, release the throttle before switching
to AWD.
CAUTION
Switching to AWD while the rear wheels are
spinning may cause severe drive shaft and
gearcase damage. Always switch to AWD while
the rear wheels have traction or are at rest.
With the A WD switch of f, the vehicle drives through the
rear wheels only (2 whee
enabled, th e fr ont dr ive act s as an on -demand A WD
system. This means, the front drive will engage once the
rear wheels have lost traction, and will remain engaged
until the torque requirement goes away (i.e. rear wheels
regain traction).
CAUTION
If the rear wheels are spinning, release the
throttle before turning the AWD switch on.
If AWD is engaged while the wheels are
spinning, severe drive shaft and front
gearcase damage could result.
l drive). When the A WD is
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
AWD Engagement: When the AWD switch is activa ted,
the AWD coil is powered by a 12 Vdc input which creates
a magnetic field. This magnetic field attracts an armature
plate that is keyed to the r oll cage. When the ring gear and
roll cage are spinning (vehicle is moving), the energized
coil and armature plate will apply drag to the roll cage that
indexes the rollers inside the ring gear to an engagement
position. While in the engagement position, the front drive
will be in an "over-running" condition (not engaged), until
the rear wheels lose traction. Once the rear wheels begin
to lose traction, the front drive will engage by coupling the
output hubs to the ring gear via the rollers. The front drive
will remain engaged until th e torque requirement goes
away (i.e. rear wheels regain traction).
Output Hubs
Rollers
AWD Dise ngagement: Once the r ear wh eels re gain
traction, the front wheels will return to the "over-running"
condition. The vehicle is now back to rear wheel drive until
the next loss of rear wheel traction occurs.
Torsion Spring Operation: The torsion spring acts as a
return mechanism to help disengage the coupling of the
output hubs and ring gear by crea ting an "over-running"
condition for the rollers upon disengagement.
Centers Roll Cage and
Rollers in Ring Gear
Output
Hubs
Ring
Gear
Roll Cage
& Rollers
FINAL DRIVE
Ring
Gear
Roll Cage
& H-Springs
7
Torsion
Spring
7.17