Horizon Fitness E51 Service Manual page 55

Adjusting the Elliptical Drive Belt Tension
Tools: Phillips screwdriver, 11mm wrench, 13mm socket, 14mm socket,
17mm wrench, 5mm Allen wrench, crank puller. Note: Refer to diagram on
following page.
1. Remove the 13mm nut and associated bolt that attach the lower
handlebar to the lower link arm.
2. Remove the bolt and washers that attach the left lower handlebar to
the left pedal arm.
3. Remove the crank arm cover from the left pedal arm with a
Phillips screwdriver.
4. With a 17mm wrench, remove the nut that attaches the left pedal
arm to the crank axle. Remove the pedal arm from the crank axle.
5. Remove the black cap from the center of the crank disk.
6. Remove the crank arm nut with a 14mm socket.
7. Thread a crank puller onto the crank arm. Extract appropriately
and remove the crank arm and crank disk from the crank axle.
8. Lift console mast boot.
9. Remove the accent piece by gently lifting up at the bottom of the
accent piece and lifting towards the front of the machine.
10. Remove the screws that attach the left side cover in place.
11. Repeat steps for right side.
12. Check belt tightness. To measure the belt tension, a timing belt
tension gauge is required. The correct belt tension tolerance is
120-140 lbs. If a belt tension gauge is not available, the drive belt
should have about 0.25" deflection when pressing down firmly on
the drive belt.
13. To adjust the tension of the drive belt, loosen the 17mm nut (R16),
which hold the flywheel to frame on both sides.
14. Tighten or loosen the 11mm nut (R15) holding horizontal
tensioning bolt into position on both sides of the to adjust the
tension of the drive belt.
15. Once the belt tension is set properly, tighten the 17mm nut on both
sides of the flywheel.
16. Attach the right and left side covers and secure with screws.
17. Replace wood grain accent piece.
18. Slide console mast boot back into place.
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