Hydraulics Questions

Steve Lehman · Jul 11, 2009

The hydraulics on my Oliver 70 (M & W add-on pump mounted behind the governor - live hydraulics)are making a rattling noise. I assume that this is due to overheating of the fluid (using all-season hydraulic oil). Am I using the correct oil in this, or should I be using a straight weight oil? Their is a 3/4" suction line that goes from the reservoir to the pump, and a 1/2" pressure line that goes to the valve. The valve is mounted on top of the reservoir, so I assume that the oil passes through the valve and dumps back into the reservoir when it is not used for lifting. Is it possible that the fluid is not dumping back through the valve fast enough? There is another inlet on the reservoir - I could run a bypass to that inlet and regulate it with a valve when I am not using the loader. I would appreciate any ideas. Thanks.

led · Jul 11, 2009

Is this an OPEN or CLOSED system??
Led

Anonymous-0 · Jul 12, 2009

A rattle type noise may be pump caviatation. Does it go away when the unit is warm? What is your defination of all season hydraulic oil? Do you have numbers for it. The reservoir has a breather? is it plugged. It sounds to me like the pump is starved. How noisey are the timing gears is this a 3 or 5 gear 70?

Steve Lehman · Jul 12, 2009

Here is some more information. The pump is a Webster Electric 3HCS-2R. The oil that I am using is the Wal-Mart (I'll take my lumps now) Year Around Hydraulic Oil. Have no idea on the weight. Looks almost clear, like a mineral oil. The noise seems to get worse when the unit warms up. The breather for the reservoir is on a 4" long standpipe, but the actual breather hole is 1/4" diameter and is not plugged. If the reservoir is full, oil will come out the breather. The reservoir outlet (3/4") is near the top of the reservoir, and there is no filter. As I recall, there is an elbow inside the reservoir that turns down for the suction line. The hydraulic valve is a Gresen. From the layout of the system, it must be an open center system. The tractor is a 3-gear 70 (1940), but the noise has nothing to do with the timing gears. I am in the process of installing a Horn loader with Sears & Roebuck single-acting cylinders on this tractor. It looks like I will have to get some additional reservoir capacity, since the volume of the cylinders appears to be more than the volume of the reservoir.

Wilson · Jul 12, 2009

supply line collapsed????

Steve Lehman · Jul 12, 2009

Hope not - it's a new hose.

Anonymous-0 · Jul 12, 2009

Does the top come off the reservoir. With the suction port toward the top is there is a problem with the supply tube inside the reservoir you may be sucking air. It would be beteer if gravity would fill the pump. Also in this day and age the breather such as you describe is a good place for contamination to enter the system. I sent you an e-mail. J.

bc · Jul 12, 2009

The rattling noise or what sounds like a zinging noise that vibrates the pressure line could be pump cavitation due to a partially plugged filter and/or filter screen or even a suction leak allowing air in. It is common during the winter when the fluid is cold and thick and not flowing well till it warms up.

Another source of that sound is when a valve isn't centering properly or gunk plugging somehing in the valve or return or flow divider area (if it has one) that causes the pressure to go up and constantly hit the pressure bypass valve. That constant opening and closing of the bypass could cause the zinging sound or if the bypass never closes it may just make a high pitch whine.

I wouldn't worry about the hydraulic except next time replace with the recommended type.

How long has it been since you changed the filter and cleaned the screen? Check it and post back.

Samuel L Bontregger · Jul 12, 2009

I did have that same thing happen once with a brand new hose good luck

Hydraulics Questions

Steve Lehman

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led

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Anonymous-0

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Steve Lehman

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Wilson

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Steve Lehman

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Anonymous-0

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bc

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Samuel L Bontregger

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