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6. Slowly turn the Drive Pulley (B) backward and carefully

ease the Drive Belt (C) to the outside to remove it from the

Flywheel Pulley (D) and Tensioner Assembly pulley (E).

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screws and washers (with arrows) that secure the EMS

Engine to the Frame. Set the hardware aside for reassembly.

Slowly remove the EMS Engine.

8. Put the new EMS Engine in position on the Frame and

install the hardware.

9. Put the Drive Belt (C) in position on the Flywheel Pulley

(D) and the Tensioner Assembly pulley (E). Be sure that

the upper portion of the Drive Belt is under the Tensioner

Assembly pulley.

10. Make sure the Drive Belt (C) is aligned on the Flywheel

Pulley (D), Tensioner Assembly (E) and Drive Pulley (B).

11. Using needlenose pliers, attach the Belt Tensioner

spring (A) to the Frame and Tensioner arm (F). Make sure

that the belt tension is correct. Refer to the “Belt Tension

Adjustment” section in this manual.

Note: This step may require two people.

12. Connect the EMS Cable to the EMS MCB Watts

assembly and secure it with a ziptie.

NOTICE: Do not crimp the cables.

R628 left side view

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Nautilus U628 Service Manual

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