My garage door sticks on the way down, apparently when the bottom roller meets a bolt in the track (see photo). A shot of garage door lube on the bolt head helps it close for the first couple of times. After that I need to give it a little tug. I don't see any way to adjust the roller position. Suggestions?
It is likely that the misalignment of the lower vertical track section with respect to the lower edge of the curved track is causing this problem. In your case the curved track piece is spot welded to the bracket that then mounts to the door frame. This means that the curved section is not adjustable unless there are slip-joint bolt adjustments in the bracket itself.
To readjust the lower track section you will have to loosen the bolt and possibly add another lower down on the track section. The hole the bolt goes through should allow some movement of the track back and forth. When you get it properly aligned then re-tighten the bolts.
From the picture it looks like there may be some interference between the two track sections. If this is the case it may be required to loosen all the bolts on the lower track section to see if it can drop down just enough to eliminate the interference. In the worst case it may be necessary to file or grind off part of the top edge of the vertical track. This would be best achieved by completely removing the track section so you can work on it.
Be aware that it is rather standard that there are bolts in the track area to permit assembling the whole track and brackets. Contrary to another answer here that suggests that the bolt there is someones "fix" it is normal that there be a bolt there. In my own garage both the upper curve and lower vertical section are bolted to the bracket and are adjustable. From my picture you can see how the tracks are perfectly aligned and the rollers are rubbing on the bolt heads every time they go by.
I'm a residential garage door installer in the Detroit area, been doing it for over 14 years. Like what Jim the commercial guy said, your issue is the alignment of the two tracks. Loosening the bolt pulled the lower track forward. Another thing that very well might be going on is the bracket might not be level. If it's pitched inward where the joint is that will also cause the door to hang up at the joint. I would try to realign the track first before doing anything drastic.
The fact that the track is colored and the bolt is not means nothing. The track could have either been powder-coated by the manufacturer or a previous homeowner might have decided to paint it, either way the bolt does not need to match the color. If the bolt is a problem try changing it out for one with a flatter head. Although from the picture it would appear that your door is probably 50-plus years old, and I highly doubt a bolt that has been there the entire time is suddenly a problem. If anything the bolt loosened and that allowed the track to slip, causing your hang-up problem. If the bolt is bad it's simply because it's stripped out not because it's a different color.
One trick to get the bottom track to slide forward would be to put the claw of a hammer into the bracket with the head pressed up against the door jamb, loosen the bolt and pry gently with the hammer to pull the bottom track out and then re-tighten the bolt.
Sorry it's so long-winded, hopefully it helps.
The track has failed there and that bolt is someone's repair.
I would remove that bolt, then re-seat the track so that the channel shape matches and weld it so it has a smooth run without any bolt there.
Another option may be to drill a countersink and fit a screw with a flatter head that will be flush or close to flush to the track.
Check your cables, both of you who put pictures in. There is enough play in a properly installed door that those bolts do not come close to causing a problem.
The door looks like it is crooked, which happens when one of the cables is longer than the other. This could be from the cable unraveling, one is broken or poor install.
I would reccomend hiring a professional to fix damaged cables because they are attached to the spring and can be very dangerous.
Looking at the rubbing on the bolt and the rubbing on the track above, it looks to me that the bolt is in the way of the roller.
But there is another mounting hole just below and to the left of the bolt that you have circled. There is no corresponding hole in the bracket behind, however. Without removing the lower track, I would drill that hole through the bracket, using the hole in the track as a guide for the drill bit. I would then remove the bolt from the original hole to this new hole.
This should mean that the bolt holding the lower track is now out of the way of the roller.
Get a new track bolt first off to put there
Yes loosen the track and align the joints Make them a smooth junction
Change a few rollers . long stem 2 inch nylon can buy a pack of 10 for 10.00 Amazon
Lube your moving parts on your door.
That has nothing to do with squaring up door
If door is out of square .yes square by slipping a drum to get door aligned or square in opening Get a nice flat headed track bolt