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Old 01-11-2017, 10:26 AM   #1 (permalink)
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2006 TRX350 4x4 no drive up front...?

Hi Chaps,

Here's another one for you:

I noticed my TRX350 FM6 doesn't have any drive to the front wheels. The propshaft/driveshaft turns when driving all the time, but it doesn't drive anything up front.

Would it be the splines in the cup joint just in front of the front diff that have worn/sheared, or could something else more sinister be afoot?

Thanks in advance

Paul
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Old 01-11-2017, 12:44 PM   #2 (permalink)
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Did you put the bike in the air and run it to see if the front wheels turn?
If they don't turn then yes inspect all splines and work your way fourward till you find the problem. If all splines are good then the problem is with the front diff.
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Old 01-11-2017, 12:55 PM   #3 (permalink)
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If you have power to the rear wheels that same shaft turns the front driveshaft (it goes all the way through the motor), so yeah, you've got stripped splines on the front driveshaft somewhere, or your front diff has disintegrated. I think you'd know if it was the diff (grinding) so I'm guessing stripped splines.

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Old 01-11-2017, 01:58 PM   #4 (permalink)
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Quote:
Originally Posted by Carolynskiii View Post
Did you put the bike in the air and run it to see if the front wheels turn?
If they don't turn then yes inspect all splines and work your way fourward till you find the problem. If all splines are good then the problem is with the front diff.
I've only had the front in the air (and been watching closely while my friend drives/spins the tyres in mud). Definitely NO drive at the front wheels.

I had the front end up today, and when I turn a front wheel the thicker part of the driveshaft that comes from the rear of the front diff spins independently of the driveshaft (the same one...) that comes from the engine.

What can we deduce from this please?
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Old 01-11-2017, 02:00 PM   #5 (permalink)
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Quote:
Originally Posted by Jeepwm69 View Post
If you have power to the rear wheels that same shaft turns the front driveshaft (it goes all the way through the motor), so yeah, you've got stripped splines on the front driveshaft somewhere, or your front diff has disintegrated. I think you'd know if it was the diff (grinding) so I'm guessing stripped splines.

Welcome to the forum.
Thanks Jeep. Please see my post above - would you say the diff internals are OK and it's the splines have been fudged?

Would I be able to weld the thicker collar (rear of the front diff) to the main driveshaft?
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Old 01-11-2017, 02:38 PM   #6 (permalink)
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Quote:
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Quote:
Originally Posted by Jeepwm69 View Post
If you have power to the rear wheels that same shaft turns the front driveshaft (it goes all the way through the motor), so yeah, you've got stripped splines on the front driveshaft somewhere, or your front diff has disintegrated. I think you'd know if it was the diff (grinding) so I'm guessing stripped splines.

Welcome to the forum.
Thanks Jeep. Please see my post above - would you say the diff internals are OK and it's the splines have been fudged?

Would I be able to weld the thicker collar (rear of the front diff) to the main driveshaft?
Yes, and yes, although replacing the driveshaft would be better. I've seen quite a few welded up like you're talking about.
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Old 01-11-2017, 03:29 PM   #7 (permalink)
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One assumes the problem with welding the driveshaft together is that you can't then pull it all apart if something goes wrong down the line?

Thanks for your help, by the way - it's most appreciated.
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Old 01-11-2017, 05:35 PM   #8 (permalink)
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your problem is with your front differential. odd are, its right there where your drive shaft enters the pinion gear on the front differential.
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Old 01-12-2017, 06:45 AM   #9 (permalink)
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A little more...

I jacked up the front today, I can turn the bell that comes out the rear of the front diff by hand and both wheels turn in the same direction, back or forwards. It spins and the driveshaft stays still.

Can I assume my diff is OK?
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Old 01-12-2017, 07:06 AM   #10 (permalink)
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Your differential is probably Ok but I'd still worry about stripped splines on the driveshaft.

Rick

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