[Sport4x4]

Done for the day. Wish I had a lift!

I’m guessing that means your back is getting sore, mine sure would after crawling around doing all that.

 

[BadM0nkey]

More like knees. I did a good 4 hours of barn / horse related work before I started on the Viking.

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[BadM0nkey]

Next remove the 22mm nut holding the parking brake disk to the diff. I slid 2 screwdrivers through the bracket to keep it from rotating. Then put the nut back on and use a deadblow hammer to get it started. You should be able to wiggle the disk assembly off.

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[BadM0nkey]

Remove the oil seals by gently working around the edge from inside with a big screwdriver. Insert it till it touches the metal and then pull it back a little so you don't scratch it. Pry gently. Take your time.

When you get them out pack the holes with a clean rag or plastic to keep crap out of the diff.

Off to the auto parts store for brake cleaner. I will carefully clean the diff (and everything else) before re-assembly.

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[MNDirtRider]

Looking good! Awesome tutorial and documentation! Thank you for doing this.

 

[BadM0nkey]

No problem! So far none of it was hard, just time consuming. I will finish up during the week and then add the top engine mount.

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[BadM0nkey]

After the diff and disk are reasonably clean, make sure the seal groove is very clean. Put a little oil or grease in the groove and around the seal. Push it in level with you fingers and seat it with something smooth using a rubber mallet.

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[BadM0nkey]

The drive shaft seal is harder. I got really lucky because I have been keeping any hardware item that I think may be useful someday and had these two hard rubber bumpers.

Maybe a winch hook bumper would work?

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[BadM0nkey]

I am not going to detail assembly unless there is something weird I had to figure out. Here is the first example about how to put the diff back in place. Do not tighten any bolts till they are all in and finger tight! :

1. Tuck it up and backwards through the frame till the drive shaft will clear the engine.
2. Carefully mate the drive shaft to the engine by lining up the splines and slide the rubber boot into the notch.
3. Make sure that the diff is vertical and the holes line up with the non-removable side bracket.
4. Install the rear bracket to keep the diff vertical and put in the short rear mounting bolt.
5. Install the side bracket and bolt the diff in-place between the side brackets.
6. Now tighten the bracket bolts and the diff mounting bolts.
7. Attach the breather hose and the parking brake caliper.

 

[cactus]

The drive shaft seal is harder. I got really lucky because I have been keeping any hardware item that I think may be useful someday and had these two hard rubber bumpers.

Maybe a winch hook bumper would work?

A socket the same size as the outer part of the seal works really well.

 

[BadM0nkey]

A socket the same size as the outer part of the seal works really well.

I was going to mention that but not everybody has sockets for repairing dump trucks.

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[buckg2]

I was able to replace the drive shaft seal with just sliding the the housing back. It was tight, but got it done. Your way is the proper way though. Nice work

 

[cactus]

I was going to mention that but not everybody has sockets for repairing dump trucks.

Doesn't everyone have a 3/4 drive socket set?

 

[Sport4x4]

I do bu

Doesn't everyone have a 3/4 drive socket set?

I do but it is still sitting on the shelf at the store. 🤪

 

[trailcutter]

I was able to replace the drive shaft seal with just sliding the the housing back. It was tight, but got it done. Your way is the proper way though. Nice work

does your bottom skid plate come off? my skid plate is welded so no access underneath.am wondering what year yamaha started welding the rear plates and how to change seal or remove the rear dif as my pinion seal is leaking?

 

[bd_skrillz]

does your bottom skid plate come off? my skid plate is welded so no access underneath.am wondering what year yamaha started welding the rear plates and how to change seal or remove the rear dif as my pinion seal is leaking?

My best guess is he took off the dump bed to get to it. The back skid plate can come off as it is aftermarket. And the middle one stays on welded.He probably had to become a contortionist

 

[trailcutter]

My best guess is he took off the dump bed to get to it. The back skid plate can come off as it is aftermarket. And the middle one stays on welded.He probably had to become a contortionist

my skid plate is all one piece and welded from front to back,the diff might come out the back if turned on its side or maybe take shock off and take it out the side.

 

[bd_skrillz]

my skid plate is all one piece and welded from front to back

Wow. What a pain.

 

[trailcutter]

i guess yamaha can't afford to pay someone to bolt their skid plates on,cheaper to use a robot to weld them making simple repair jobs hard..

 

[Mdavis]

Good info.. helps me with trying to figure out how the get the driveshafts out to remove my engine