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MW hydraulic pump fluid

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Dick Davis

09-01-2002 03:36:14

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Trying to get all my work tractors to push the same hydraulic fluid so I won't be comingling different fluids through common cylinders. After disking with a 49 M with an M&W pump for about 2 hours the disk would no longer raise. Checked for leaks and fluid level OK. Let the tractor set during lunch worked another hour, worked OK then same problem. My question, were the M&W pumps made to use 30wt ND like the belly pumps they replace? Would a 300 RC do ok with 30wtND? Thanks Dick

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09-01-2002 10:03:18

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 Re: MW hydraulic pump fluid in reply to Dick Davis, 09-01-2002 03:36:14  
Dick - very interesting question regarding old equipment and newer equipment.

On our farm equipment, we use regular hydraulic fluid on hydraulic systems which do not have hydrostatic drives. On hydraulic systems with hydrostatic drives, we use Hy Trans or AW46. Regular hydraulic fluid is cheaper than AW46 or Hytrans and workd just as well for cylinder movement and motors. We use AW46 in all the newer tractors.
The older pumps such as M&W or Bee Gee were intended to use SAE 30 wt. This oil has a heavier viscosity and works well with pumps with loose tolerances.
HyTrans should work in all pumps but the viscosity is less than SAE30wt. As the oil heats ups, the viscosity is reduced and the oil literaly slips in the pump causing excessive heat and lack of oil flow.
I suspect that the M&W pump is probably tired which causes your problems.
Good luck and let us know what you find out.

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Michael Soldan

09-01-2002 04:42:20

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 Re: MW hydraulic pump fluid in reply to Dick Davis, 09-01-2002 03:36:14  
Dick you ask a good question as I am wondering about cross-contaminating fluids from My H to the 584. I once plugged the trans filter in the 584 by borrowing a neighbour's equipment. The ram on his equipment contained foreign substances in the hydraulic oil and I suspect a different type of fluid. It seems to me that my H with no filter on the liftall ,filled with SAE30 would really do no favours to the 584 filled with hy-trans and a filter system. I see on this line that some say hy-trans will work in the old lift alls but not as well. I'll be watching the forum here to see what kind of reply you get. Mike in Exeter Ontario

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