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Hydraulic Oil Filtration

Quki22

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Seguin, TX
Has anyone attempted to plumb in an onboard bypass filtration circuit for their hydraulic oil? Something that would take hydraulic oil from the tank drain hose, maybe via an oil scavenger pump, filter it through a 2 micron filter then discharge back to the top of the tank. Basically an onboard hydraulic oil kidney loop. Of course this would be in addition to the OEM hydraulic filter.
 

Nige

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I've seen these used on larger machines. I would imagine the problem on a machine the size of yours is finding a location to mount it. CCJ is the class of the field for fine/bypass filtration as far as I'm concerned.
https://www.cjc.dk/products/fine-filters/hdu-15/12-compact/
I've got the technical file for it if you would like a copy without having to register on their web site.
 

Quki22

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Sure Nige. If you don’t mind. I would like to review the file. Appreciate the input
 

Quki22

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Seguin, TX
Thanks Nige. Looks like it’s max operation temp is 176F. Wouldn't the oil temp exceed that under operation?
 

Nige

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These are some slightly larger units we used on haul trucks. I checked the spec sheet. Same design operating temperature - 80degC/176degF and I know for a fact the systems on that truck can run up to close to 100degC before the high temp alarm comes on.

upload_2022-8-5_22-42-13.png
 

Quki22

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Seguin, TX
Great info. Thanks Nige. That HDU 15/12 is a nice unit. Everything is compact I’ll have to do some studying to see if there is even any room. If not I may have to try and piece together a unit that can be mounted in different locations and connected by hoses. The challenge will be getting the correct flows rates and pressure. It looks based on the fact sheet you provided that the max flow of the unit is .5 gpm. It appears low flow and adequate pressure is the key. Up to 26 psi across that filter is a significant head loss.
 

John C.

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I have a client in my area who puts systems on all his iron. I've sent him a message asking for details and will report back.

If a system is a kidney loop it is a bypass system. If it gets plugged, nothing happens to the rest of the system.
 

Quki22

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Messages
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Location
Seguin, TX
Thanks John. That’s what I’m looking for. Something completely separated from the machine hydraulics. Like you said, if it clogs nothing happens, filter goes into bypass and hydro oil returns to the tank unfiltered. Got to have the bypass don’t want to dead head the pump, as only bad things happen.
 

John C.

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The filters are made by a company named Harvard and the company in this area that installs them is called GreenCo. I don't see a web site for them so I suspect they only work in this area. Good Luck

https://harvardcorp.com
 

Quki22

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63
Location
Seguin, TX
Does anyone know if the hydraulic drain hose in the belly of the unit is pressurized during operation?
 

Quki22

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Messages
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Location
Seguin, TX
Hey Nige,
Cat 277c jwf01714. The hose that the O&M Manuel says to use in order to drain the hydraulic system/tank. It’s a loose hose with a drain plug at the end of the hose. I am curious to know if that hose has pressure on it when the machine in on.
 

Nige

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Hey Nige,
Cat 277c jwf01714. The hose that the O&M Manuel says to use in order to drain the hydraulic system/tank. It’s a loose hose with a drain plug at the end of the hose. I am curious to know if that hose has pressure on it when the machine in on.
It shouldn't have any major pressure in it, but an easy way to check is to loosen the hydraulic tank cap while the engine is running. Do you get a whoosh of air then nothing.? If so that's your confirmation. The tank is always going to get a small amount of pressure in it during operation as a result of heating the air in the space above the oil.

EDIT: The tank is shown as having a breather so provided that is clear the tank should be atmospheric.
 
Last edited:

Quki22

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Jul 10, 2022
Messages
63
Location
Seguin, TX
That makes sense. The pressure would only be the head pressure from the oil. I was under the impression that drain hose connected to the tank however when I was tracing it it connected to a hard line via a threaded connection. This also makes sense it’s Lower than the tank so you could drain the system more completely. However once I saw that it was connected to the hard line I got to thinking if this drain line was under some type of pressure during operation other than the head of the hydraulic oil in the tank.
 
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