990 with power assist steering

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fcagle
Posts: 160
Joined: Thu Jun 12, 2008 9:26 pm
Location: Seagrove, North Carolina

990 with power assist steering

Post by fcagle » Wed Feb 12, 2014 3:51 pm

Fellows,

I have a 990 with what I call power assist steering. It has so many leaks that I would need an oil truck to follow me around to keep it working. Is it possible to retrofit a power steering assembly off of a 885 and replace this system? I have one of those that I can get my hands on cheaply. Or should I attempt to rebuild the cylinder and replace the hoses and make this work as it was designed? Any comments are appreciated. fcagle

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erkki
Posts: 2032
Joined: Sun Apr 09, 2006 12:02 pm
Location: North Finland

RE: 990 with power assist steering

Post by erkki » Thu Feb 13, 2014 5:23 am

I would try to fix the old PAS. Hoses are no problem at all. If the ram has scratches, it may be difficult to make it oiltight. I have heard about FEL rams, which have got extended lif by means of soldering some tin to the chromed shaft scratches and very careful finsihing by sanding.

W.B.R erkki

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bedwards1966
Posts: 862
Joined: Sun Mar 07, 2010 10:36 pm
Location: North Yorkshire

RE: 990 with power assist steering

Post by bedwards1966 » Thu Feb 13, 2014 7:53 pm

P38 Isopon body filler is perfect for pitted rams, just take your time and sand it smooth and it'll last for a lot of years.

Dieter
Posts: 245
Joined: Thu Jul 20, 2006 8:50 pm
Location: Everdingen, The Netherlands

RE: 990 with power assist steering

Post by Dieter » Fri Feb 14, 2014 8:14 am

However, if you can get your hands on a full power steering set cheaply, buy it!

On a 990 I would prefer full power steering over PAS, but that is my personal opinion...

Guest

RE: 990 with power assist steering

Post by Guest » Fri Feb 14, 2014 9:23 am

Where David Brown parts of this nature are concerned, there's nothing available cheap, if you can find anything at all. Refurbish what you have with new seals and hoses, you can still get the appropriate seals and hoses are pretty standard. If the ram is pitted you can fill the pits but all traces of oil need to be removed for any type of filler to stick and stay put, if the pits are not deep and there are no rough sharp edges you might be ok but you could probably take the ram to a specialist and have it refurbished, probably cost you less in the long run, would be worth an enquiry.

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

RE: 990 with power assist steering

Post by John_Allen » Fri Feb 14, 2014 10:26 am

As PR says, parts are scarce and expensive for the DB PAS. It might be possible with a bit of skill and luck to be able to make some other PAS system fit and work. There are firms that sell kits for Fords, Massey Ferguson etc and one of their rams may fit with a few modifications.

However, as Dieter says, the hydrostatic system is much better - more reliable and the tractor steers better with it. Beware though - there are differences between the Q-cab version and the earlier ones and it takes some work to make the steering column and wheel fit an earlier one. If you check eBay, beware - some don't say which version the kit is; though charge top dollar for either!

fcagle
Posts: 160
Joined: Thu Jun 12, 2008 9:26 pm
Location: Seagrove, North Carolina

RE: 990 with power assist steering

Post by fcagle » Fri Feb 14, 2014 9:12 pm

Thanks for all the suggestions. I will pull it all off and evaluate which option makes the most sense. Thanks as always, fcagle

Guest

RE: 990 with power assist steering

Post by Guest » Fri Feb 14, 2014 10:29 pm

If your tractor has the separate pump driven by a second belt from a double crank pulley you will not be able to fit the later hydrostatic steering pump or steering wheel/column, you may be able to use a later orbital unit and steering ram but that's about it but I'm very doubtful that even these are compatible.

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ollek
Posts: 3799
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

RE: 990 with power assist steering

Post by ollek » Sat Feb 15, 2014 6:53 am

The 885 had a belt driven (crank shaft pulley) Eaton pump and the other models a gear driven (timing gears) pump. Fitting a 885 hydrostatic steering to a 990 will involve a lot of modifications, if possible at all.

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nate
Posts: 86
Joined: Wed May 20, 2009 8:59 am
Location: australia Nsw Terrigal

RE: 990 with power assist steering

Post by nate » Sat Feb 15, 2014 8:47 am

A neighbour of ours replaced his 990 PAS with hydrostatic steering from a cab less 1194 some fabrication was necessary to mount the column/orbital unit. He used a 995 ram and the original PAS Pump.

fcagle
Posts: 160
Joined: Thu Jun 12, 2008 9:26 pm
Location: Seagrove, North Carolina

RE: 990 with power assist steering

Post by fcagle » Fri Jul 11, 2014 4:18 am

Ok, finally got back on this project. I'm convinced that rebuilding the cylinder is my best option so that's the path I'm going to go down. The PAS ram is actually in good shape except for where the steering bar attaches to the cylinder. It doesn't appear to leak at all around the cylinder shaft, just at the control point where the bar attaches. I can't seem to find the repair parts anywhere. Does anyone know where these parts can be obtained? Also, is it something I can do or do I need to try to find someone to do it professionally? Thanks for any information. Fcagle

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