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Unread 05-30-2012, 10:30 AM   #1
Kastraelie
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1977 CJ7 
 
Join Date: Jun 2007
Location: Biloxi, Mississippi
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Can't push rolling chassis?

This one is stumping me...

I have my CJ7 tore down to just the frame, suspension, and axles.

Since the parking brake cable does not connect to anything anymore, I don't think that is the issue... I do have the powersteering system hooked up.

Anyways, I can push the darn thing backwards and it rolls OK, but forwards is a no go. The weird thing is when I try to push it forwards the back passenger side wheel locks up and just drags the tire. If I PUSH that tire, rotating it like a giant captains wheel, I can move the chassis forwards...like the diff stops seizing or something.

I could push my fully built YJ in neutral around all day long and moving this chassis is like pushing a grounded oil tanker...

Anyone want to explain to me what noobie mistake I am making? I would have posted this in my build thread but answers are slow in there.

Thanks so much!

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Unread 05-30-2012, 10:33 AM   #2
MightyLampshade
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I'm taking a wild stab here but is it possible there is a locker in the rear axle? I'm not even sure if that would cause the behavior you're describing but I'd be tempted to take off that diff cover and see what was going on inside there.
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Unread 05-30-2012, 10:46 AM   #3
mopar346
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Is the pinion loose by chance? It can walk in and bind against the case.

Do you have 2 different ratios fron and rear and the T-case in 4WD?

Is it possible soem of the brake hardware is loose in that wheel?

Did it sit with the parking brake engaged for an extended period of time?

Are the brakes adjusted too tight on that wheel?

That is all I can rattle off quickly, the locker shouldn't matter unless you are turning it, if it is when turning then I agree or check for a spool.
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Unread 05-30-2012, 10:53 AM   #4
Kastraelie
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Hmmm some good things to check here.

Unfortunately I don't have alot of answers as I know next to nothing about this frankenjeep's history. I know that the T case isn't in the vehicle or the driveshafts, so I can rule that out. The parking brake might have been engaged for a long arse time, but I did release it when I took the vehicle apart...I think. xD

The solution for most of them is to get in there and take it apart more...which is fine because that is what I need to do at this point.

Thanks for the ideas guys, Mightylampshade and Mopar.
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Unread 05-30-2012, 10:53 AM   #5
CSP
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You have a brake shoe binding with the drum. Try to drive a drum brake vehicle with the emergency brake on. It will go backwards, but try to go forward and it won't move.

Same thing here.
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Unread 05-30-2012, 10:54 AM   #6
Kastraelie
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Quote:
Originally Posted by CSP View Post
You have a brake shoe binding with the drum. Try to drive a drum brake vehicle with the emergency brake on. It will go backwards, but try to go forward and it won't move.

Same thing here.
Ok awesome, that sounds like it might be it. Thanks!
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Unread 05-30-2012, 12:05 PM   #7
mopar408
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Just to check that it IS brakes and only that 1 wheel, pull the one wheel, remove the drum and reinstall wheel.
If it rolls good you have brakes to troubleshoot.
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Unread 05-30-2012, 12:10 PM   #8
mopar346
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Chances are he is gonna have a time getting the drum off.

Make sure the brake cable is fully released (the wheel that goes to that wheel) and back the brake adjuster way off. If the springs are broken in there it can act that way as well, goes to what CSP is saying, shoe floats and binds.
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Unread 05-30-2012, 12:40 PM   #9
mopar408
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Chances are he is gonna have a time getting the drum off.
Das' right and in itself will tell him that it's brakes. On the other hand, it's also a good chance when he pulls the drum the whole $#!+ will just pour out and explain why it bound up.
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Unread 05-30-2012, 12:44 PM   #10
mopar346
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Sounds like experience talking there.

You're among good company.
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