Dallas Center IA 515-720-2463 | Your Allis-Chalmers 7040 is Closed Center. As are all A-C 7000 and 8000 series tractors, except the model 7000.
They are a early type of LS closed center.
Will run a hydraulic spray pump just fine.
I have been using hydraulic spray pumps since 1980. Most of the time with White tractors, which are closed center PC.
And with a Deere 4630 which is also closed center PC.
On Ace pumps closed center PC tractors use a restrictor orifice, and the bypass fully closed.
On closed center LS the flow to the pump is controlled by the flow control on the tractor.
Again on pump fully closed the bypass.
I am fully convinced that most, almost all problems with hydraulic spray pumps are caused by not reading or following the OM.
Or by sales person who don’t know what they are talking about.
This is a Ace pump pub on setting up hydraulic pumps.
http://www.acepumps.com/_Assets/Literature/HYD-MAN%20REV%2012-11.pd...
With your 40’ boom the Ace model 204 will have plenty of flow.
But I am not sure if 204 work with LS. May need a 206.
As far as PTO vs hydraulic spray pumps go.
If I acquired a sprayer with a PTO pump on it, as soon as it was on my place, I would take the PTO pump off and throw it in the iron pile. Even if the pump was brand new.
Edited by Robert W Greif 2/26/2017 09:31
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Running hydraulic sprayer pump.. Vs pto pump
