Star Trac 4000 Treadmill Belt and Deck Replacement

1. Switch the Power off on the unit.
2. Next, unplug the unit from the wall
3. Loosen the two lower bolts from the upper portion of the right handlebar and remove them.
4. Loosen and remove the bolt in the bottom of the right handlebar.
5. Now carefully twist the handlebar clockwise to remove it from the unit.
6. Remove the finger guard retaining screws and carefully remove them from the deck at each end of the rear roller.
7. Loosen each rear roller bolt by 10 full turns. Then count the remaining turns necessary to remove the rear roller bolts. Remember to write down the number of turns needed to remove the bolts in each side for future reference.
8. Carefully remove the rear roller from the unit. Clean any wax or debris buildup from the roller and place it aside.
9. Raise the shroud and secure it with a bungee cord.
10. Work the drive belt off the motor pulley by hand turning the flywheel while pushing the belt aside.
11. Now remove the front roller retaining bolts.
12. Carefully remove the front roller from the unit. Clean off any wax or debris buildup and set it aside.
13. Loosen and remove the deck bushings from the left side frame rail. Stubborn deck bushings can be removed with the assistance of pliers, once the screws have been loosened completely.
14. Move the deck toward the left side of the frame to free the deck from the right side. The deck will move down once the frame has been cleared.
15. Remove the deck and belt by raising the right side edge of the deck over the frame rail and sliding it to the right to remove.
16. When installing a new belt or deck it is important to note that a new belt and deck surface should always be installed together. Failure to adhere to this guideline will severely shorten the life of the installed parts. Some decks can be used on both sides. However, be sure that each side is only used once. Be sure to install the belt in the proper direction on the unit. Consult the belt manufacturer for proper direction if the belt is not marked or you are unsure.
17. Install the belt and deck by first putting the belt on the deck, and then installing them from the right side as a unit.
18. Be sure the deck is lined up with the frame and push the deck to the left side.
19. Now carefully lower the right side of the deck to insert it into the frame rail and then push the deck to the right as far as possible.
20. Install the deck bushings from the left frame rail. (Check with mfr. for proper torque during install process.)
21. Carefully place the front roller on the deck under the belt and push it forward into place, while placing the drive belt on the inside of the drive pulley.
22. Replace the front roller bolts. (Check with mfr. for proper torque during install process.)
23. Now spin the roller by hand while pushing the drive belt onto the pulley. Be sure to spin the roller several times to insure complete installation of the drive belt on the pulley.
24. Install the rear roller into unit. Carefully start each bolt and turn one to two threads to ensure no cross-threading has occurred.
25. Tighten each rear roller bolt the number of turns you kept earlier for reference.
26. Install right handlebar and bolts into the unit. (Check with mfr. for proper torque during install process.)
27. Now, Plug in and power on the unit.
28. Carefully remove the bungee cord from the shroud and lower it back into place.
29. Start the unit at a very slow speed and check for proper belt alignment. Remember to start at the slowest speed possible and be ready to stop the unit quickly if needed.
30. If the belt is moving to right side of unit tighten the right roller bolt, If the belt is moving to the left side of the unit tighten the left roller bolt until the belt is tracking properly.
31. Caution: make very small adjustments such as ¼ turns and then watch the belt for several moments before making another adjustment.
32. Once the belt is tracking properly walk on the unit at a slow speed and check for belt slippage on foot fall. If this is happening tighten each of the rear roller bolts equal turns until the slippage is no longer occurring. Caution: make very small adjustments such as ¼ turns and then watch the belt for several moments before making another adjustment.
33. Now use the unit at a jogging speed to check for belt travel or slippage.
34. If slippage still occurs make small equal adjustments (1/4 turns) to both sides of rear roller and re-test.
35. Install the finger guards once you have enough clearance from the rear roller.
36. Some manufacturers require wax or lube during the install process, please consult your owner's or service manual for further information regarding this.

About This Video

• In this video, we show how to tension and align the chain and flywheel on a StarTrac NXT bike



• First you see an example of a chain that is way too loose



• To correct this loosen the flywheel bolt on both sides of the flywheel



• Loosen the tension nut on the sprocket side of the bike and tighten the tension bolt until you get the proper deflection on the chain
  
  
  
  
  
  • A properly tensioned chain will have roughly 3/16" of deflection
  
  
  
  



• Tighten the tension nut and the flywheel nut on both sides as shown in the video

• Misaligned chains will look like they are walking from side to side where they enter and leave the sprockets
  
  
  
  
  
  • This can cause noise, premature wear, as well as making the chain look to be jumping from side to side during use
  
  
  
  



• To correct this, loosen the flywheel nut on both sides of the flywheel, then loosen the tension nut and adjust the tension bolt to move the flywheel in the proper direction needed to align the chain with the flywheel sprocket, as seen in the video
  
  
  
  
  
  • Note: If you have already achieved proper tension of the chain, adjusting the tension nut on the opposite side from the sprocket will help to keep the same tension on the chain
  
  
  
  



• Don't forget to check the chain tension after making an alignment adjustment