Checking Pump
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    JDfarmer's Avatar
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    Checking Pump

    I have a JD 2640 and i want to check sump pump flow to make sure its supplying enough oil to the main hyd pump up front. Could anyone suggest some simple ways to test pump flow? Thanks.

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    Captain Hook Kennyd's Avatar
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    Flow meters are pretty expensive, while pressure gauges are relatively cheap. I can't give specifics for your machine, but generally you have to hook them inline for the test, so it's not very easy either.
    Kenny

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    JDfarmer's Avatar
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    Is there any way to disconnect a line somewhere and run it into a bucket to measure flow?

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    JDfarmer's Avatar
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    There are 3 lines running out of bottom right(if standing at rear of tractor) of clutch housing. One is smaller in diameter than the other two. As far as i know the two bigger lines are oil return from cooler, and high pressure "out" line from main pump. The smaller one has a union fitting in it near the engine. As far as i know this line supplies the main pump from sump pump. Would it be a good idea to disconnect this hose at the union fitting and run it into a 5 gal bucket to test flow? If so, how much oil should i expect? Thanks again.

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    Captain Hook Kennyd's Avatar
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    Sorry again but I can't help much with your specific machine, but here is some info: According to tractordata.com, this machine has a 9 GPM pump, so if you disconnect a line as you said you will have a lot of oil coming out very fast-while emptying your reservoir equally as fast. While this a an OK way to test a well or yard hydrant, it is hardly advisable with potentially hot high pressure hydraulic oil.
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    Kenny

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    [QUOTE=Kennyd;3176786] According to tractordata.com, this machine has a 9 GPM pump, so if you disconnect a line as you said you will have a lot of oil coming out very fast-while emptying your reservoir equally as fast. While this a an OK way to test a well or yard hydrant, it is hardly advisable with potentially hot high pressure hydraulic oil.


    Kenny
    No offence intended but hyd pump output on a JD 2640 will be determined by which hyd pump this 2640 has. According to 2640 parts catalog it could have a 1.38 IN.3 OR 2.4 IN.3 pumps which are 9 & 15 GPM.

    If I understand correctly JDfarmer was asking about checking sump(trans) pump which IIRC is about 5 GPM. I agree with you that the only accurate way to check GPM is with a flowmeter. Trans pump output can be shade tree mechanic checked by loosening/removing hyd filter cover with a bucket under opening,turn engine over for 15 seconds & bucket should contain around a gallon of oil. Allowing 160 psi vs 2250 psi oil to free flow in a bucket are 2 totally different experiences
    Jim

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    Quote Originally Posted by JDfarmer View Post
    There are 3 lines running out of bottom right(if standing at rear of tractor) of clutch housing. One is smaller in diameter than the other two. As far as i know the two bigger lines are oil return from cooler, and high pressure "out" line from main pump. The smaller one has a union fitting in it near the engine. As far as i know this line supplies the main pump from sump pump. Would it be a good idea to disconnect this hose at the union fitting and run it into a 5 gal bucket to test flow? If so, how much oil should i expect? Thanks again.
    IIRC those 3 lines you're referring to are very difficult to disconnect short of splitting tractor. I will suggest utilizing loosening hyd filter cover as I previously stated or try getting GPM at the hose you referred.
    Last edited by Tx Jim; 01-24-2019 at 07:44 AM.

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    Zebrafive's Avatar
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    I would also go from the transmission filter as TxJim suggested. The trans pump sends oil to the filter, then the front pump.
    If you're lucky and have a ported filter cover, you could plumb a hose to container and leave the filter cover on.

    Remember the trans only holds about 10 gallons and will be empty very fast.
    J
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    Captain Hook Kennyd's Avatar
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    No offense taken here...I stated twice I had limited knowledge of this model. I’ll bow out now...
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    Kenny

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    JDfarmer's Avatar
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    The filter cover has hose running out of the bottom to the SCV control valve, so that means i have a ported filter cover, right?

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