10SECT 1—MAIN ASSEMBLY FOR HELP-1.800.354.3643 OR GENIECOMPANY.COM1. Set power head so that front panel (with endof shaft and rail attachment flange) is facing up.Fig. 1-1.NOTE: If you have this type Carriage Stop, skipStep 2. DO NOT install Bumber.2. Install bumper [45].• Peel protective paper from glue sideof bumper.• Stick bumper into position as shown.Fig. 1-1.3. Install coupler [39].• Place coupler over end of shaft.• Turn it as needed until it engages with shaft.(It will drop down over end of shaft and willno longer turn freely. Fig. 1-1.4. Set power head on its bottom. Fig. 1-4.5. Attach 1-piece rail or “first” rail section[3A]of 3-piece rail to power head.• (3-piece only)Select “first” rail section. (It hasprotective cardboard sleeve over end ofscrew.) Fig. 1-2.• (3-piece only) Remove cardboard sleeve.• Slide end of screw out about 5 inches.Fig. 1-3.• Place bearing end of screw against coupler.Fig. 1-4.• Turn screw until it engages with coupler.• Slide rail section into rail attachment flangeuntil holes in rail match up with holesin flange.• Secure “first” rail section with 2 bolts [4] and2 nuts [5], hand tight only. Fig. 1-5.• For 1-piece rail, skip to step 8.bumpercouplerFig. 1-1Fig. 1-2Fig. 1-3Fig. 1-4Drive screws can slide out of rail sections.Keep rail sections level until operator isfully assembled.CAUTIONNOTE: 3-piece rail assembly is for doors up toand including 7 feet 6 inches high. An extensionfor 8 feet doors is available.OPEN BLUE PARTS BAGRubber bumperCoupler[39] [45]serial no.