Polaris RZR XP 1000 2017 Service Manual page 308

TRANSMISSION
When "Differential-Lock" is selected, power is removed
from the electrical solenoid allowing the solenoid plunger
to retract. Spring tension moves the shift fork back into
place and mates the engagement dog to the side gear
that is part of the planetary differential assembly. This
locks the rear differential as a solid rear axle, increasing
traction.
9928492 R04 - 2017-2018 RZR XP 1000 / XP4 1000 Service Manual
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