David Brown 850 final drive

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Valiant Farmer
Posts: 46
Joined: Wed Aug 14, 2019 9:02 am
Location: New Zealand

David Brown 850 final drive

Post by Valiant Farmer » Sat Aug 01, 2020 7:16 am

Hello,
I have a DB 850, I think its an earlier model as it has the 6-stud hubs on the rear units.
I pulled the R/H reduction unit to free up the seized brake cross-shaft (which I have done now), and found that the hub bearing has a horrible amount of play! Worse than in-out, it has masses of side-to-side play...also the input shaft has a fair bit of side-to-side play too. What I need to know is what parts would be compatible off a Cropmaster final drive? As in bearings etc. I have a lot of final drives off CM's and 25's
Also when I was working, the pin holding the diff lock up slipped out and...
Many thanks!

tomryall
Posts: 194
Joined: Sun Jun 03, 2007 4:53 am
Location: canada

Re: David Brown 850 final drive

Post by tomryall » Sat Aug 01, 2020 2:04 pm

the diff lock should be held down not up . down pushes the collar onto the inner shaft so it cannot fall off. tie the pedal down with a piece of wire to the foot plate.

User avatar
ollek
Posts: 4430
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: David Brown 850 final drive

Post by ollek » Sun Aug 02, 2020 6:03 am

I would newer use old bearings if I rebuild a part of the transmission. Cropmaster did not have a diff lock, so the r/h side drive shaft in a 850 is different to the shaft in a Cropmaster.

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db2d
Posts: 2391
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: David Brown 850 final drive

Post by db2d » Sun Aug 02, 2020 7:42 pm

There are very few interchangeable parts between the Cropmaster/25 and 30 reduction units. The Cropmaster series has A and B type units with a combination of metric and imperial size bearings. There is only one bearing that is interchangeable with the 850 reductions.

Valiant Farmer
Posts: 46
Joined: Wed Aug 14, 2019 9:02 am
Location: New Zealand

Re: David Brown 850 final drive

Post by Valiant Farmer » Mon Aug 03, 2020 2:52 am

Thank you for all your answers. The end result - my Uncle, who is buying it for his haying fleet, has a spare unit off his 850 he will drop by sometime. PS he likes the DB 850 above his FE 35 so he wanted me to keep an eye out for another one! He is painting his gear and is getting ready for haying season. BTW, it is halfway through winter here in NZ, and we are still having summer weather! Paddocks solid etc.

Valiant Farmer
Posts: 46
Joined: Wed Aug 14, 2019 9:02 am
Location: New Zealand

Re: David Brown 850 final drive

Post by Valiant Farmer » Mon Aug 03, 2020 10:27 pm

tomryall wrote:
Sat Aug 01, 2020 2:04 pm
the diff lock should be held down not up . down pushes the collar onto the inner shaft so it cannot fall off. tie the pedal down with a piece of wire to the foot plate.
You're right, but the diff lock pedal is missing, and the lever was held up with a pin.

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