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Auxiliary Hydraulic System Modification.

2

21hunter

Member
I'm. wondering why Massey chose to recirculate the return from the auxiliary hydraulic spool valve back to the intake of the pump? I posted earlier about the Aux pump to differential case clearance problem that I'm having on my 175. I could slightly reposition the pump to gain clearance and it would be much easier if I didn't need to worry about connecting the standpipe back to the pump. Is there any reason why it wouldn't work as good or better to simply let all of the fluid return to the differential housing? Seems like there would be less chance of building up air in the pump fluid if it were done this way like many open center systems. All I'd need to do is plug the standpipe port on the back of the auxiliary pump. Any ideas would be appreciated.
Thanks
Dave
 
I believe the reason for return oil being supplied directly back to the auxillary pump, without passing thru the strainer, was primarily an oil supply problem to this pump.
The dual element pump cannot draw enough oil thru the suction filter to satisfy both gear sets in the aux. pump. This results in the low pressure side "cavitating", thus losing Multi-power pressure, especially at higher engine RPM.
Years ago, we had an MF 575 in the shop. At the time, a "twin port" replacement pump wasn't available from M.F. in a satisfactory time-frame, so a "single inlet" pump was fitted and the return oil from the remotes was directed into the centre housing.
The Multi-power & IPTO worked as they should at "low" RPM's, but at 1500 RPM's and higher, the "low" flow side starved for oil.
A lesson learned...
 
I have a 175 but the s40875 pump won't fit. Will the S.40873 pump run the multipower and the auxiliary hydraulic outlets at the same time?
 
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