Jackson kayak Flex Drive 3D, Owner'S Manual

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2. Connect Upper Drive Unit to Lower Drive Unit.
(A)
Before lowering the Upper Drive Unit onto the Lower Drive Unit, turn
the pedal cranks a few turns to note the rotating shaft; this will unite
with the coupling in the lower unit to form the drive shaft’s universal
joint.
(B)
This shaft and coupling must align properly in order for the two drive
units to seat correctly.
(C)
As you lower the Upper Drive Unit onto the trunk of the Lower Drive
Unit, align the shaft coupling and gently seat the upper drive onto the
trunk ensuring the “ears” of the upper drive align with gear track and
seats fully with no gap.
Note the “spider” coupling atop the flexible shaft; it is designed to wear
over time. A complimentary replacement is included in your packaging.
2. connect upper drive
EARS
SPIDER COUPLING
(B)
(C)