David Brown 885

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User avatar
aled23
Posts: 13
Joined: Sun Jun 07, 2009 10:31 am
Location: llangollen

David Brown 885

Post by aled23 » Tue Jan 05, 2016 7:42 pm

hello and happy new year to you all.

First question is how can you tell the difference between a david brown 880 and a 885?? is there any tell tale signs as the bonnet has been sprayer red over any logos and the badge is missing.

Also i am splitting this tractor and am required to replace the crank shaft seal as it is leaking on to the clutch causing it to slip and i am going to replace the whole clutch unit.

What am i to expect when changing the seal.I have removed the flywheel and cleaned around the area. What is the next process??

Many Thanks

Aled

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ollek
Posts: 3815
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

RE: David Brown 885

Post by ollek » Tue Jan 05, 2016 8:14 pm

You will find the model and serial numbers stamped on top of the front bolster on the right hand side just partly covered by the bonnet skirt. It is possible that you will have to scrape some of the paint to get the stamping visible. Are you sure that it is engine oil on the clutch and not transmission oil? Oil leaking from the rear crank shaft seal will end up at the front face of the flywheel. Oil from the transmission shows up between the two clutch drive shafts and /or between the transmission drive shaft (hollow shaft) and the snout. An oil leak between the two shafts ends up at the pto clutch plate and oil leak between the hollow shaft and the snout at the transmission plate.

John_Allen
Posts: 1894
Joined: Sat Dec 31, 2005 3:59 pm
Location: Cumbria UK

RE: David Brown 885

Post by John_Allen » Tue Jan 05, 2016 8:39 pm

Look at the photos in the "DB Tractor Range" page in the main menu to see the difference.

The 880 has a straight line along the bottom of the bonnet sides, the 885 has a raised section between radiator and fuel tank. Also, the 880 has a 2" diameter or so hole through the clutch cover that should have large plastic plugs at either end and has a "waist" in the chassis below the engine (the 885 chassis runs straight along from the clutch cover to the tombstone.

If the oil leak is bad enough, there'll be a drop or two below the clutch housing. If it's black, it will be engine oil, if it's clear, it's from the gearbox!

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case-ih1594
Posts: 1065
Joined: Sun May 12, 2013 10:38 am
Location: Preston

RE: David Brown 885

Post by case-ih1594 » Tue Jan 05, 2016 8:44 pm

Replacing the crank seal is a common repair.

It may be a good idea to Google search "DBTC crank seal" or similar to find previous threads as you can easily make the job harder than it needs to be, and many experienced people have provided useful guidance for replacing the seal.

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db2d
Posts: 2092
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

RE: David Brown 885

Post by db2d » Tue Jan 05, 2016 11:19 pm

Follow Olleks suggestions and then remove the oil seal retainer taking note so that it can be refitted in the reverse order.
Carefully press new packings into retainer grooves. Roll packings into the grooves with a round bar and then trim the ends with a very sharp knife a fraction above the retainer face and press the corners into a chamfer so that they will not spread out between the retainer faces. Clamp the retainer onto a 2.50 inch diameter mandrel to press the packings into position and check that retainer halves seat squarely together.
When fitting onto the engine smear the faces with a thin non-hardening jointing compound.
Tighten the socket screws and then unscrew half a turn.
Tighten set screws and then retighten socket screws.
Unscrew setscrews and then retighten evenly.

Smear the crank and packings with oil before refitting.

Obtain new packings from a reliable parts supplier because there are some on the market that are impossible to fit. The ideal way is to use a lathe to run them in before fitting.

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aled23
Posts: 13
Joined: Sun Jun 07, 2009 10:31 am
Location: llangollen

RE: David Brown 885

Post by aled23 » Sun Jan 10, 2016 9:31 pm

Well the tractor is stripped down,clutch,flywheel ect removed and awaiting the seals to arrive.Clutch package came but missing the seals we asked for seperatly but they are on there way now.I hope to remove the outer retainer tomorrow and install the seals. Is there anyway of testing them before putting the machine back together?? As I don,t want to put it al back together to find out its still leaking and have to split it again........

JamesF
Posts: 1327
Joined: Tue Mar 14, 2006 8:49 pm
Location: South Yorkshire

RE: David Brown 885

Post by JamesF » Sun Jan 10, 2016 10:40 pm

There's no test for the seals other than for them.

Be careful which seals you get, some are useless and don't fit. The housings are aluminium and easily damaged.

The white rope seals intended for the massey tractors I find to be the best fit

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