Free Shipping on all U.S. Orders $17.99+

Replacement Chain Rail - 5 Piece Tube Assembly- 39410R.S

Product Description
Maximum quantity available reached.

This replacement chain rail assembly is used on various model Genie garage door openers that use a 5-piece tube style rail. 

  • Assembly comes with the 5 piece rail sections, chain, carriage, pulley, sprocket, and mounting hardware
  • Compatible with the following Genie garage door openers that have a chain rail: Chain Drive 500, Chain Drive 550, Chain Glide Connect, Chain Drive 750
  • Also compatible with any Genie garage door opener with Chain rail that model number begins with 1035, 2033, 2035, 3035, 7035, 
Sku: 39410R.S

39410R.S Replacement Chain Rail Instructions

Click here for PDF Printable version of the instructions for the 39410R.S Genie chain rail replacement instructions 

Chain Rail Replacement

For use on models: 1035, 2035, 2036, 2055, 3035, 3055, 7035, 7055 ONLY!

This repair will require removal of the unit from its mounting hardware and repair made on a bench or floor. Refer to your Owners Manual/Installation Poster for proper assembly and carefully read and understand all warnings and cautions pertaining to your unit.



1. Pull emergency release cord on the carriage to disengage opener to close the door, if necessary. (If unable to lower door using an opener, use extreme caution manually closing the door. Before pulling the emergency release cord, make certain people and objects are clear of the door opening.)

2. Unplug the opener power cord from power receptacle.

3. Remove Battery Backup (BBU) from powerhead, if equipped:

4. Unplug the harness from top of the powerhead.

5. Remove two screws securing BBU to the rear of the powerhead.

6. Tilt BBU up and slide mounting brackets out. FIG. 1.

39410R.S Chain rail replacement for Genie garage door openers

7. Set BBU aside.

8. Remove lens cover(s) by pressing top tabs down and slide lens cover(s) out. Remove light bulbs. FIG. 2.

9. Remove wall control and Safe-T-Beam® wires from the terminal block located on side of two bulb models or rear of one bulb models FIG. 3. Use a small common screwdriver to press in on orange tabs while gently pulling wires from the block. Mark wires to help facilitate replacement.

10. Remove clevis pin and hairpin from door arm assembly. FIG. 4.

Instructions for replacing the Genie chain rail part number 39410R.S

11. Remove opener from mounting hardware and set opener assembly on clean work surface.

12. Remove rail assembly from the powerhead.
• Remove 4 bolts from rail mount on top of powerhead and slide rail assembly off of the motor shaft.

Removing the rail for a Genie chain drive garage door opener instructions

13. Assemble the 39410R.S replacement chain rail assembly:
13a. Align pulley in rail slot and insert clevis pin through header rail hole and idler pulley. Secure with cotter pin.
13b. Insert 5/16”-18 x 2” bolt into header rail and secure with nut.
13c. Slide carriage assembly onto the header rail section. Note “door” arrow will point towards idler pulley.
13d. Insert rail sections together by hand as shown. Assembled length is approximately 9’3”.
13e. Insert sprocket support assembly into last rail section and place rail strap onto the rail.
13f. Route chain assembly gold-threaded shaft around the idler pulley and silver threaded end around the sprocket. 

Genie chain rail replacement part 39410R.S instructions

Genie garage door opener chain rail replacement for part 39410R.S

13g. Install turnbuckle with “door” end arrow onto the gold-threaded end by rotating counter-clockwise one full turn.
13h. Disengage carriage assembly by rotating release handle downward and insert turnbuckle through the carriage as shown.
Ensure the chain is not twisted or bound.
13i. Continue routing the chain assembly until turnbuckle is near the middle of the rail. Insert silver threaded shaft into
the turnbuckle and rotate turnbuckle counter-clockwise one full turn.
13j. Hold chain and rotate turnbuckle with thumbs counter-clockwise until the chain is tensioned properly. Measure chain tension on the opposite side of the rail until 1/4” from the bottom of the rail.

39410R.S Chain rail replacement


Chain garage door opener rail replacement

Genie replacement chain rail instructions

13k. Once proper tension has been established, hold turnbuckle in place with a 7/16” or adjustable wrench. Tighten both tension nuts with a 7/16” wrench.
13l. Lower the drive sprocket over the spline shaft on top of the powerhead. Align the rail strap and sprocket support with holes in powerhead. Fully tighten 1/4”-14 x 5/8” self-tapping screws. Do not overtighten.

Tightening the turnbuckle on a Genie chain drive rail


Genie chain rail replacement 39410R.S instructions

See above for installation illustrations for steps 14 -20.

14. Reinstall opener assembly to mounting hardware.
15. Reinstall door arms in reverse of step 10.
16. Install wall control and Safe-T-Beam wires.
17. Install light bulbs and lens cover(s).
18. Reengage the carriage.
19. Plug opener in.
20. Operate opener and test all safety features. Refer to the owners manual or visit
NOTE: Limits may require reprogramming. Refer to your owners manual.
21. Install BBU, if equipped. Plug BBU harness into the top of the powerhead.
22. Inspect chain for sag and readjust tension if needed.


For technical assistance contact Genie Customer Service at 1-800-35-GENIE


Ask a Question
  • I have an 8 foot door could you tell me if this extension rail measures measures out to 120 inches

    The rail will work on a 7-foot high garage door. If you have an 8-foot high garage door you would need to add the extension kit (39027R for the chain rail).

  • I purchased a genie garage door opener from home depot for a 10ft. height door. They said they can t get one. the Genie is a 750 3/4 HPc. I need the 10 ft. rail. Thank in advance for your help!!

    That will not work on a 10-foot high garage door. The extension kit to add to the rail that comes with the Genie 750 model would only work on up to an 8-foot high garage door.

Related products