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.
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.
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
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.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.
Yes, you have ported cover (bottom right corner of drawing by key 9). That hose is the optional return for the SCV. If it did not have that hose, there would be a short hose from the opposite side of the SCV to the transmission case. There will be a plug (key 2 in the drawing) there and at the transmission case.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?
If it did not have that hose, there would be a short hose from the opposite side of the SCV to the transmission case. There will be a plug (key 2 in the drawing) there and at the transmission case.
Yes you can disconnect scv return hose at either end of hose to perform your pump test. 1-1/4 gallon in 15 seconds is correct.If i did my math right, i should get 1.25 gal of fluid in bucket after 15 secs of run time. Correct? Could i disconnect ported filter hose at SCV to perform test?
Thanks for the correction. My 2030 came with the return to filter hose. So I did not install the plugs to covert.Zebrafive
I have a slight correction to your statement the normal scv return hose between scv & tractor goes to rockshaft housing not transmission case.:flag_of_truce: