Do i need two feed lines

fastfarmall

Well-known Member
On my 51 M, i want to keep it original looking as possible, but i do have two live hyd pumps, on the right side, piggy backed behind each other, it use to work, ok ,but not good, the problem i think i am haveing is a 3/4 pipe in the belly pump tank big enough to feed both pumps, the back is for the power steering, the front one is for the remote's, it just doesnt seem to be getting enough oil, it will stop turning[the steering wheel]and then grab again! Will a bigger line or if i drill another 3/4 in bung on the left side of supply, tank, will that work, anybody did that?
 
Depends on what size the pumps are. I wouldn't want to be trying to feed more than 15 GPM max through a 3/4 line. 12 would be better. Lighter weight oil will flow easier than heavy oil. IMO
 
Probably need to drill and tap it for 1" suction line. 3/4 inch has .442 sq cross section. 1 inch has .79 area. JimJim
 
Not sure how good those piggy back pumps work with the reservoir lower than pump. Most were used with a reservoir added higher than the pump or a Belhen power steering motor with a built in reservoir. Would go with a suction line to each pump with that setup myself. 1/2 inch line from drain hole may supply enough for the piggy back pump. They do on gravity flow but not sure with pump above.
 
I thought about 1" in also, if that didn't weaken the housing there,in the belly pump. I still have the belt pulley on it, so another tank for the power steering would be tight in there, But a level tank height would be much better! Thanks for the help guys !!
 
If you have this type, lots used a reservoir like picture.
cvphoto8781.jpg
 
Your the man D Slater,mine is a Behlen, just like that,and i do have a tank just like that, i had given up on getting that mounted in there, you gave me new encouragment !!
 
The belly pump is only 6 quarts... Could it be the pumps are simply sucking it dry?

Live hydraulics on our M were not reliable until we added a 5 gallon reservoir under the gas tank. The belly pump simply did not hold enough oil to satisfy demand.
 
Oil flow is greatly effected by whether the oil is being pumped under pressure, or being sucked, or whether it is under low pressure like oil under return pressure to a reservoir.

With all the different sizes of fittings, pressure changes, be real difficult to speculate what your problems are, But I think your hunch is really close to a Bullseye. A suction line that flows 10 gallons per minute has a flow diameter of 1-1/10 inches. The live pumps for M/SM are 12 GPM, You need a hose or tube 1-9/16" flow diameter.

Do a search for "Hydraulic oil flow in pipe", the top website shows you all the info you need to fix your hyd. system. Way too complicated to explain here but you should be able to read it and figure out how to fix things in a couple minutes.

I've suggested what you should have done instead of posting your question here. I can't see what all cobbled up plumbing you have on your M, hydraulics on My '51 M works fine! Now fix yours!
 

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