HT4 D4-7U Hydraulic Question

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Skip in CT

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Here is the problem, I have a model 44 hydraulic unit and the number on the tag is 7W7721 and I am leaking oil from the control levers. The Cat dealer here faxed me part breakdown from a 6F500 and a 4F8881 (the 8881 is questionable because of it being a fax) and both show only one control lever. Am I missing something or is this all I have to work with?

I guess if the tank cover gasket is available I should just dig into it and see what the seals are and match them best I can.

Any help is always appreciated, Skip in CT

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Thu, Aug 18, 2011 12:24 AM

Old Magnet

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There should be lots of info in the old post archives.....if you can make it work, as this has been discussed many times.

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Thu, Aug 18, 2011 12:34 AM

Skip in CT

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Reply to Old Magnet:

There should be lots of info in the old post archives.....if you can make it work, as this has been discussed many times.

Thanks OM, I found where you posted the seal numbers last year. I will get a gasket from CAT and seals from a local guy and dive into it.

Skip in CT

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Thu, Aug 18, 2011 4:05 AM

CATCURT

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Reply to Skip in CT:

Thanks OM, I found where you posted the seal numbers last year. I will get a gasket from CAT and seals from a local guy and dive into it.

Skip in CT

The seal numbers from cat are
1J2382 large seal
9F3847 small seal
4F4217 gasket for cover
I have replaced mine and they leaked so I did it again and installed 2 seals in each place and no leak. The original seal had 2 sealing lips and the new one only has one. Good luck

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Thu, Aug 18, 2011 9:01 AM

Old Magnet

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Reply to CATCURT:

The seal numbers from cat are
1J2382 large seal
9F3847 small seal
4F4217 gasket for cover
I have replaced mine and they leaked so I did it again and installed 2 seals in each place and no leak. The original seal had 2 sealing lips and the new one only has one. Good luck

Should be a lot more info in old posts, including some quite recent.
In any event, get in to it and I'm sure any info you need can be supplied again.

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Thu, Aug 18, 2011 9:24 PM

JAKEcatHT4

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Reply to Old Magnet:

Should be a lot more info in old posts, including some quite recent.
In any event, get in to it and I'm sure any info you need can be supplied again.

yeah I performed this same task last year and might have started a thread. I got lucky and sealed it up with one of each size. The seals can be cross referenced and purchased from a bearing, belt supply house. I went as far as getting into the pump valve mechanism and replacing some o rings. Was hoping to improve the performance of the slow hyrdraulics but may have focused on wrong area..oh well got it back with new o rings anyways..good luck, pretty simply job except for fumbling all those cover bolts

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Tue, Aug 23, 2011 10:29 AM

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