780 hub seal / wheel bearing

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Henry&Saly
Posts: 32
Joined: Tue Jan 29, 2019 7:10 pm
Location: Shropshire

780 hub seal / wheel bearing

Post by Henry&Saly » Sat Jul 06, 2019 12:35 pm

Hi all.

Read near side hub seal is leaking.

I've stripped the back plate off, undone the locking castl nut, removed the shaft.

I can see the hub seal and that it's knackered, it practically fell to bits in my hand.

How do I get the new one in? It seems logical that the seal should be installed from the inside.
If so how to I go about removing the rear wheel bearing? I've given it a few stern taps with a lump hammer and a block of wood... Nothing.

Any help muchky appreciated.

Thankyou

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db2d
Posts: 2098
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: 780 hub seal / wheel bearing

Post by db2d » Sat Jul 06, 2019 1:41 pm

Remove the six cap screw/bolts from the seal housing and it can be detached from the reduction casting. The bearing can then be knocked out. Check the collar that the seal is in contact with for wear and replace if necessary. The seal housing and bearing etc have to be fitted onto the hub before insertion into the reduction unit. A special ‘ C ‘ spanner is a necessity for tightening the ring nut. This inexpensive spanner is available from davidbrownparts.com

Henry&Saly
Posts: 32
Joined: Tue Jan 29, 2019 7:10 pm
Location: Shropshire

Re: 780 hub seal / wheel bearing

Post by Henry&Saly » Sat Jul 06, 2019 6:22 pm

Thank I have the spanner. I have just dug out the 6 bolts from the oil and muck.

Cheers

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db2d
Posts: 2098
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: 780 hub seal / wheel bearing

Post by db2d » Sat Jul 06, 2019 8:24 pm

The ring nut needs to be really tight. This can be achieved by holding the nut and turning the hub with a long bar ( 4 ft + ) placed through the wheel studs with the wheel nuts on to protect the threads, and finally, hitting the end of the spanner with a lump hammer whilst maintaining pressure on the bar.
Pack the double lipped seal with grease before assembling.

Gard
Posts: 244
Joined: Sun Apr 06, 2008 2:25 pm
Location: Fairfax Vermont USA

Re: 780 hub seal / wheel bearing

Post by Gard » Sat Jul 06, 2019 10:19 pm

I like the idea of the long bar in the wheel studs, I did not think of that. I made a block of hard wood that jamed between the gear and housing, then used a cheater bar and hammer on the spanner wrench. seemed to work well. I also used high strength thread locker on the splines and threads when I reassembled, I may regret this if it ever has to come apart again. I do not know what differences there may be between your 780 and my 990 implamatic.
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cobbadog
Posts: 613
Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: 780 hub seal / wheel bearing

Post by cobbadog » Sun Jul 07, 2019 12:11 pm

That ring nut is fun to put back on aren't they! I did both sides on the 30C and did similar to the way you did yours. Early in the torquing up I also used a soft hammer against the outer flange to help bed the shaft into the bearings and that helped a bit too, then it was time to get serious and use a long bar as described to the point I could not move it any more no matter what I tried.

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