90 series power steering problem

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Wheelie
Posts: 71
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

90 series power steering problem

Post by Wheelie » Fri Sep 06, 2019 4:56 pm

Hi just wondering is it possible for the power steering oil to leak into the engine on the 90 series,a 1490 actually?oil was getting pumped out of the breather pipe on the top of the power steering pump if it's filled up to the proper level after using the steering for not a long time,there seams to be alot of pressure in the system,I was told to open the bung on the pump,work the steering and let it find its own oil level in the pump,which I did and alot of oil got pumped out when the steering was being turned,it works ok but I do have to top up the oil(not to the proper fill level) often enough if being used constantly,there are a couple of small seep leaks but nothing major leaking out that I can see, and would be hard to steer on low revs if worked for a time but ok on high revs,would anyone have any ideas what might be the problem?thanks

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ollek
Posts: 3802
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 90 series power steering problem

Post by ollek » Fri Sep 06, 2019 5:11 pm

The pump shaft axle seal can be faulty in two ways. Engine oil will get into the steering when the engine is running or oil from the steering will leak into the engine when the engine is switched off. What oil was used in the steering system when you got the tractor and what oil have you used for topping up? Are you sure that there is no external leak from the system? Have you change the filter in the bowl and if so, is the filter fitted correctly? A faulty pump can create all sorts of problems, including low pressure and therefor heavy steering.

Wheelie
Posts: 71
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: 90 series power steering problem

Post by Wheelie » Fri Sep 06, 2019 9:14 pm

The oil is an atf it's a red oil not sure of the grade,I have never renewed seals or the filter in the bowl,must mention I tried another pump and was the exact same thing happening as with previous pump but that's not to say that the second pump was good either,is it a very bad thing to have the power steering oil in the engine if it's leaking into engine? I will get seals and filter renewed in the spare pump and put it on and see what happens,thanks

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ollek
Posts: 3802
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 90 series power steering problem

Post by ollek » Sat Sep 07, 2019 5:25 am

I sdo not think that the original oil in the steering was ATF, but a engine oil or a hydraulic oil. Mixing ATF with other oils will make the oil foam.

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

Re: 90 series power steering problem

Post by bedwards1966 » Sat Sep 07, 2019 8:34 am

If it was my machine I'd be draining out all the ATF from the system (including emptying the ram) and running it on the same oil as the engine uses so that no harm will be done if it ends up in the engine.

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GeoffDEAL
Posts: 425
Joined: Tue Jan 27, 2009 8:25 am
Location: New Zealand

Re: 90 series power steering problem

Post by GeoffDEAL » Sat Sep 07, 2019 10:13 am

Have always used trans oil in the power steer but ran out so used engine oil and was much better smoother and less noise and as noted safer if you get a leak to engine.

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ollek
Posts: 3802
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 90 series power steering problem

Post by ollek » Sat Sep 07, 2019 11:06 am

Please, do not use ATF oil in any place in a David Brown tractor.

Wheelie
Posts: 71
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: 90 series power steering problem

Post by Wheelie » Sat Sep 07, 2019 11:11 am

Sound advice lads thanks,is there a certain procedure to drain power steering oil out? Will get a second pump I have sent for recon too

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ollek
Posts: 3802
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 90 series power steering problem

Post by ollek » Sat Sep 07, 2019 12:34 pm

Disconnect the hoses at the steering cylinder end and turn the steering wheel slowly left and right several turns and times. Push and pull on the steering cylinder piston rod. Do not start the engine in doing this. Do not fill the system with new oil before you have changed the filter.

Wheelie
Posts: 71
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: 90 series power steering problem

Post by Wheelie » Sat Sep 07, 2019 1:33 pm

Great thanks a mill!

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