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400 super diesel hydraulics

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Author  [Modern View]

04-29-2014 18:52:05

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I have just purchased a 400 super diesel. The hydraulics are very weak. I'm sure the pump needs rebuilt. Does anybody know where I can get the parts or do you know where I might find a good used one?

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04-30-2014 15:25:40

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 Re: 400 super diesel hydraulics in reply to CountryCase, 04-29-2014 18:52:05  
Another thing to check would be the orings that seal the pump to the tubes that go down into the hydraulic reservoir. They get old and can crack allowing the pump to suck in air.

The tube in the reservoir has a screen on the end of it. It may be plugged with debris. You can check that by dumping the oil and removing the cover on the filter and the filter. The filter is on the back side of the reservoir on the right side. It has 3 bolts with a pipe plug in the center. The filter can be cheaned and reinstalled assuming its there.

Some folks will add a quart of 85W-140 to the oil to help deal with wear in the pump.

Good luck.


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04-30-2014 19:27:04

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 Re: 400 super diesel hydraulics in reply to EliG, 04-30-2014 15:25:40  
I pulled the filter. The screen wasn't plugged but the oil was BAD dirty. I will give the heavy oil a try. I will take it apart this summer to check the O rings. I have it on a disk right now an don't really want to take it apart unless its a must. Thank you for the info

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Adirondack case guy

04-30-2014 04:42:40

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 Re: 400 super diesel hydraulics in reply to CountryCase, 04-29-2014 18:52:05  
Are you sure the pump is bad, or is the relief valve weak. I would be doing a pressure test first to check the valve. A flow test would tell the whole story, but most people donn't have a flow meter. A simple 2000# gauge plumbed to a male coupling will get you started.

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04-30-2014 19:18:30

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 Re: 400 super diesel hydraulics in reply to Adirondack case guy, 04-30-2014 04:42:40  
I pulled the relief valve. had $1.50 in quarters shimming the spring. Now has $1.75. works a little better. I will get a gauge an put on it. Thanks for the info

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