Ford 1520 blowing Hydr Filter Seal

mrbrettbaker · Mar 2, 2011

I've got a good friend with an 87? Ford 1520. 3 times in the last 2 weeks he has blown the gasket rubber out of the hydraulic filter, and the filter has been replaced twice. I'm a 30+ yr mechanic and I'm betting there is some kind of restriction or stuck bypass but I have not gotten a manual yet (ordered) and I haven't gotten up to his house yet to look. I am hoping this is something someone here has seen before and can save me alot of work? Any ideas would be appreciated.
Thanks
Brett

RickB · Mar 2, 2011

Used to be a significant problem often traced to New Holland's never-ending shuffle of filter suppliers and part numbers. The current SBA340501030 hydrostatic filter has not suffered seal failures in my experience. The factory measure of charge pressure probably will not indicate a problem. Properly install the correct, current New Holand filter if your friend is currently using ANYTHING else.

Kays Supply · Mar 2, 2011

The filter is on the suction side. Shouldn't be much pressure. Check the case vent. I have seen " dirt dobber" wasps block it.

jinman · Mar 2, 2011

Kays Supply said:
The filter is on the suction side. Shouldn't be much pressure. Check the case vent. I have seen " dirt dobber" wasps block it.

These tractors have a suction filter and an HST pressurized filter. My bet is that the problem is the pressurized HST filter and the problem can be resolved by RickB's method. NH has had a rash of blown HST filter seals, especially in winter when charge pressures are initially highest until warmup.

mrbrettbaker · Mar 2, 2011

Thanks for the info. This is a spinon Napa filter #7088, before that a wix 557088mounted on the side of the engine. I have not gotten up there to see it yet, but will replace with a New Holland Filter if we are talking about the same filter? Were is this vent?
You are right about the Twmp, we are in Albany NY and it is very cold now. I does fail after first starting up and has been good if he lets it warm up awhile.
So, what are you thinking?

Kays Supply · Mar 2, 2011

I know Yanmars better than Shibaura, but the breather on a Yanmar is under the seat high on the trans/diff. Some have caps and others just a pipe bent in a 180.

RickB · Mar 2, 2011

Kays Supply said:
I know Yanmars better than Shibaura, but the breather on a Yanmar is under the seat high on the trans/diff. Some have caps and others just a pipe bent in a 180.

Stick to the Yanmars. This isn't a vent issue, and we are not discussing the suction filter.

To the OP: don't panic until you blow an OEM filter seal. You can call Greenwich, Amsterdam, or my workplace @ 518-398-7107 for a NH filter.

mrbrettbaker · Mar 7, 2011

Thanks Rick, but now it's really panic time! We put the new OEM filter on and blew the O-ring out of it twice.Can you steer me in the right direction for an order of testing or diagnosis? Any help would be greatly appreciated!

mrbrettbaker · Mar 8, 2011

Is there a bypass or other valve beyond this filter that may be sticking. He order a manual weeks ago and it still hasnt arrived so I have no hydraulic schematic to work with.

RickB · Mar 9, 2011

mrbrettbaker said:
Thanks Rick, but now it's really panic time! We put the new OEM filter on and blew the O-ring out of it twice.Can you steer me in the right direction for an order of testing or diagnosis? Any help would be greatly appreciated!

In your other thread (Still insist on duplicating?) you say that the OEM filter would not fit. Time to get your story straight. A Wix filter is not and never was an OEM filter on a 1520.