G4003G Transmission Question.

[epanzella]

While swapping out change gears for a metric thread I noticed that one of the bolts on the side of the transmission was backed out a bit. It was one of the 3 bolts in the flange thru which the input shaft goes into the transmission. When I tightened the bolt, it added so much drag to the input shaft that I could hardly turn it by hand. Loosen the bolt again and it's smooth as glass. Try as I may I can't get the shaft to turn smoothly with all three bolts tight. I ended up tightening them with the short end of the allen key in my hand to limit torque. Is this flange some sort of preload (doesn't look like it) or should it be tightened town?

 

[dave2176]

can you put a picture of the bolt in question up and I'll look when I get home?

In the manual they only look like gasketed flanges. Maybe the bolt drags a gear because it's too long?

 

[epanzella]

In the first picture it's the flange right under the lowest gear in the geartrain. In the second picture the gear and gear arm have been removed. There's 3 bolts, The top left one was backed out a bit. With them as tight as I can make them holding the short end of the allen wrench, I can turn that shaft easily with my fingers. Sock them down and I can barely turn it by hand if I reinstall the gear for more leverage. Without the gear I can't budge it.

 

[dave2176]

On mine the bolts are all tight. Looking at the breakdown there is a gears on the other side a the casting. I wonder if your bolts are too long and hitting it. Manual says they are M6x16.
Dave

 

[drs23]

While swapping out change gears for a metric thread I noticed that one of the bolts on the side of the transmission was backed out a bit. It was one of the 3 bolts in the flange thru which the input shaft goes into the transmission. When I tightened the bolt, it added so much drag to the input shaft that I could hardly turn it by hand. Loosen the bolt again and it's smooth as glass. Try as I may I can't get the shaft to turn smoothly with all three bolts tight. I ended up tightening them with the short end of the allen key in my hand to limit torque. Is this flange some sort of preload (doesn't look like it) or should it be tightened town?

Ed, like you know I've got the same lathe and all of mine are tight (now). They were a little Lucy when it arrived and discovered when I went over all the fasteners like I was advised to do by the wise ones here. I'm kinda in the same camp as the others that have suggested that perhaps Yuo Ching just picked up the wrong fastener for that particular location. It happens. I found three socket head bolts just rolling around in the bottom of the crate when I was assembling it. One went to the follow rest. Never did find where the others went but it performs flawlessly to this day.

Oh, and I don't want to be "that guy", but where are your wooden handles for that sharp pointy, will hurt you end of you file?:whiteflag:

 

[epanzella]

Ed, like you know I've got the same lathe and all of mine are tight (now). They were a little Lucy when it arrived and discovered when I went over all the fasteners like I was advised to do by the wise ones here. I'm kinda in the same camp as the others that have suggested that perhaps Yuo Ching just picked up the wrong fastener for that particular location. It happens. I found three socket head bolts just rolling around in the bottom of the crate when I was assembling it. One went to the follow rest. Never did find where the others went but it performs flawlessly to this day.

Oh, and I don't want to be "that guy", but where are your wooden handles for that sharp pointy, will hurt you end of you file?:whiteflag:

I hear you about the bolts. Dave said the same thing. It's funny, but it's only the last 1/4 turn on the bolt that does it. I'll have to pop them out and see if they're too long. By the way, I'm very proud of that file and just took the wooden handle off for the picture so you could see the whole thing.
Thanks to you & Dave,
Ed P

 

[dan12]

I hear you about the bolts. Dave said the same thing. It's funny, but it's only the last 1/4 turn on the bolt that does it. I'll have to pop them out and see if they're too long. By the way, I'm very proud of that file and just took the wooden handle off for the picture so you could see the whole thing.
Thanks to you & Dave,
Ed P

did you get a fix on your problem yet?
I'm getting a G4003G soon,reading all I can!
likely order vwithin a week

 

[epanzella]

did you get a fix on your problem yet?
I'm getting a G4003G soon,reading all I can!
likely order vwithin a week

Sort of. I put a washer under the bolt and nothing changed so it wasn't that the bolt was too long. I just ended up leaving that bolt snug but not totally reefed down. I'm guessing that the collar or the housing has a bump or a taper throwing off the alignment slightly. Next time I take it apart I'll put a shim in there but for now it's fine the way it is. I luv this machine, I think you'll like yours.
Ed P

 

[chip maker]

Don't know but seems to me you may try calling Grizzly tech support and see if they have had this problem with other machines. They are useualy pretty good with help if you get the right person on the phone. A phone call would take alot less time than trying to figuare out a home made fix. May be that coller is not made correct and they would send a replacement !! Just my thought as I have used there support before with very good outcomes.

 

[zmotorsports]

I wonder if the bore is not perpendicular with the mounting surface of the flange and when you tighten that last bolt it preloads the shaft enough to create drag. Just a thought.

Mike.