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Massey 255 Auxiliary Hydraulic Pump Inspection/Replacement


 
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Jason Harville
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Joined: 27 Mar 2012
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PostPosted: Tue Jan 22, 2013 12:40 pm    Post subject: Massey 255 Auxiliary Hydraulic Pump Inspection/Replacement Reply to specific post Reply with quote

Hi,

I have determined that my auxiliary pump is probably shot on my MF 255. I have a copy of the service manual that instructs to split the tractor for pump replacement. I'd like to get a visual on the pump style and make sure its not a loose connection before ordering something new. Before I order a new pump, is it possible to remove the lift cover to inspect the pump and hoses? Any chance the pump can be removed from the top?

Thanks,
Jason
 
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Dieseltech
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Joined: 29 Feb 2012
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Location: Indiana

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PostPosted: Tue Jan 22, 2013 1:08 pm    Post subject: Re: Massey 255 Auxiliary Hydraulic Pump Inspection/Replaceme Reply to specific post Reply with quote

You can check line connections with the lift cover off, but it must be split to be replaced as it must come out the front.
 
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Jason Harville
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PostPosted: Tue Jan 22, 2013 1:29 pm    Post subject: Re: Massey 255 Auxiliary Hydraulic Pump Inspection/Replaceme Reply to specific post Reply with quote


That is what I was afraid of. I've split 3500 pound ford tractors before but I'm a little nervous about the size of this 255. Is this something that can be done without access to an overhead lift? I was thinking I could build up a support block for the front half and then put the rear half on some sort of heavy duty rolling dolly setup so it could be rolled away from the front. That sound reasonable?
 
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samn40
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PostPosted: Tue Jan 22, 2013 3:58 pm    Post subject: Re: Massey 255 Auxiliary Hydraulic Pump Inspection/Replaceme Reply to specific post Reply with quote

Do not get all up tight about splitting this tractor...I don't even
use a jack on the rear part to split these....Simply chock up the
gearbox after driving wooden wedges into each side of the front
axle to stop it falling over. Then put about 40 inches of snug
fitting tubing over the PTO shaft, get someone to hold down on
it while the last bolt is taken out and then simply wheel the rear
end out levering down on the tubing. The rear end is nearly 'in
the balance' When wheeled out set it on a block of wood and
then wheel it back in the same way using the tubing to 'steer' it
into place.
By the way.... do all your checks to eliminate the pump
problems first, These tractors sometimes rupture the steel pipe
inside, or maybe even a blocked filter?
Sam
 
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Jason Harville
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PostPosted: Tue Jan 22, 2013 5:11 pm    Post subject: Re: Massey 255 Auxiliary Hydraulic Pump Inspection/Replaceme Reply to specific post Reply with quote

Interesting idea. I hadn't thought about setting up a cantilever off the rear, although I had noticed that the rear end looked fairly close to balanced. So based on your advice, it sounds like its well worth the effort to remove the lift cover for inspection? I'm secretly hoping its a hose or metal line but I'm usually not that lucky.

I appreciate the input. There doesn't seem to be a wealth of information on these 200 series tractors online. If I decide to tackle the project I'll try to get some pictures to post here.

-Jason
 
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Jason Harville
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PostPosted: Tue Feb 05, 2013 7:41 am    Post subject: Re: Massey 255 Auxiliary Hydraulic Pump Inspection/Replaceme Reply to specific post Reply with quote


I was able to get the tractor split this weekend. I ended up using an engine lift to support the rear end while I rolled it back. Was much easier than I anticipated. I was also able to remove the aux pump and disassembled it for inspection. The pressure plate was pretty badly worn and the seals on the back side had ruptured. Could also see where the housing had been eroded a bit. The new pump is ordered.

One thing I was going to ask about. I've noticed this tractor is very particular about the lift quadrant positioning. It has the pressure control system and it seems like its always creeping the lift up or down unless I get the quadrant set to just the right place. Is this something I should look into adjusting while the rear end is disassembled? The service manual doesn't seem to be too clear on how this system works.
 
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