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Mixing hydraulic fluid and ATF #5280896 11/30/19 07:07 AM
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dlundblad Offline OP
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I bought a SpeeCo branded log splitter yesterday. It came with 5 gallons of AW46, but once the entire system filled up, it’s about an inch below the add mark on the dipstick and 1.5 gallons low.

I’m seeing mixed reviews online that don’t seem to match what’s in my owners manual. People say their manual specifically says not to mix whereas mine says it can be “substituted” ( I take this to mean it’s mixable?) as well an an entire switch for cold weather performance.

Are there any long term issues with me topping off the system with ATF? I have plenty of that on hand.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5280934 11/30/19 08:16 AM
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Kira Offline
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You'd think mere filling of rams would be forgiving but I guess it's all about how the fluid mix will treat the pump.

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5280983 11/30/19 09:55 AM
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I wouldn't, especially on something brand new. BITOG anxiety!


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Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5281072 11/30/19 11:58 AM
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MolaKule Offline
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If its a 22 ton log splitter (you didn't state the model or tonnage force) the stated capacity is 5 gallons and usually comes with NAPA ISO 46 fluid.

Filtering is important so stock up on extra filters and replace 1 quart per filter change.

A recommended hydraulic Oil which is a blend of mineral and synthetic base oils can be found in ISO46;

https://www.schaefferoil.com/documents/130-254-td.pdf

Last edited by MolaKule; 11/30/19 12:55 PM.

"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5281082 11/30/19 12:20 PM
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Chris142 Online Content
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Don't mix them. You may use one or the other but not both mixed. I mixed them in our lift at work and it foamed.


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Re: Mixing hydraulic fluid and ATF [Re: MolaKule] #5281386 11/30/19 06:37 PM
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dlundblad Offline OP
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Originally Posted by MolaKule
If its a 22 ton log splitter (you didn't state the model or tonnage force) the stated capacity is 5 gallons and usually comes with NAPA ISO 46 fluid.

Filtering is important so stock up on extra filters and replace 1 quart per filter change.

A recommended hydraulic Oil which is a blend of mineral and synthetic base oils can be found in ISO46;

https://www.schaefferoil.com/documents/130-254-td.pdf


Thanks. It’s a 25 ton.

The reservoir holds 5 gallons. Filling the entire system while maintaining a “filled” amount requires 6.5. It’s also good to know ISO46 is a blend.

I’ll stick with the one fluid.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5281505 11/30/19 09:32 PM
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MolaKule Offline
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Originally Posted by dlundblad
Originally Posted by MolaKule
If its a 22 ton log splitter (you didn't state the model or tonnage force) the stated capacity is 5 gallons and usually comes with NAPA ISO 46 fluid.

Filtering is important so stock up on extra filters and replace 1 quart per filter change.

A recommended hydraulic Oil which is a blend of mineral and synthetic base oils can be found in ISO46;

https://www.schaefferoil.com/documents/130-254-td.pdf


Thanks. It’s a 25 ton.

The reservoir holds 5 gallons. Filling the entire system while maintaining a “filled” amount requires 6.5. It’s also good to know ISO46 is a blend.

I’ll stick with the one fluid.


ISO 46 Hydraulic fluid can be based on anything from pure mineral oil, to a mineral oil PAO Blend, to a pure PAO synthetic.

Cold weather performance improves as you go from a mineral oil to a Blend to a synthetic.

When I built log splitters using Caterpillar Rams, I used Schaeffer #254.

Last edited by MolaKule; 11/30/19 09:35 PM.

"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5281633 12/01/19 05:33 AM
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dlundblad Offline OP
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Thanks.

I have no idea what it ended up coming with, but I’m assuming it’s the cheapest mineral stuff possible. The containers were generic with no manufacturer. Same with the pint of oil it came with. No manufacturer.

I’ll see how it does in the cold before topping off.. I guess the less fluid the system has, the faster it’ll warm up and since it’s cold, nothing should get too hot.

Their idea of cold weather and when to change to a better fluid is 32*F so I may have to make a change sooner rather than later. Somewhat surprising it came with such a thick oil since you’d think anyone splitting wood would be in temps much colder.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5281651 12/01/19 06:23 AM
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dlundblad Offline OP
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Say I did want to switch.

How clean would the system have to be if changing from hydraulic oil to ATF? I assume no old fluid can be left behind. Seems like it’d be easier to stick with a thinner and/ or synthetic hydraulic oil since I’d assume I’d just need to drain and refill.

Maxlife ATF seems like the cheapest well rounded option IMO. Cheap, easy to find and full syn.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5282514 12/02/19 12:26 AM
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MolaKule Offline
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Originally Posted by dlundblad
Thanks.

... Somewhat surprising it came with such a thick oil since you’d think anyone splitting wood would be in temps much colder.


The fluid that it came with should have the same viscosity as a Dex/Merc ATF since it specs an ISO46 fluid.

I suggested stocking up on filters because those filters can trap a lot of moisture.


"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Mixing hydraulic fluid and ATF [Re: MolaKule] #5282556 12/02/19 04:56 AM
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dlundblad Offline OP
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I’ll do that.

Hopefully I can find an aftermarket version.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: MolaKule] #5287440 12/07/19 06:25 AM
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dlundblad Offline OP
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Originally Posted by MolaKule
Originally Posted by dlundblad
Thanks.

... Somewhat surprising it came with such a thick oil since you’d think anyone splitting wood would be in temps much colder.


The fluid that it came with should have the same viscosity as a Dex/Merc ATF since it specs an ISO46 fluid.

I suggested stocking up on filters because those filters can trap a lot of moisture.


How are these systems prone to moisture buildup?


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: Mixing hydraulic fluid and ATF [Re: dlundblad] #5288797 12/08/19 06:24 PM
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MolaKule Offline
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Originally Posted by dlundblad
Originally Posted by MolaKule
Originally Posted by dlundblad
Thanks.

... Somewhat surprising it came with such a thick oil since you’d think anyone splitting wood would be in temps much colder.


The fluid that it came with should have the same viscosity as a Dex/Merc ATF since it specs an ISO46 fluid.

I suggested stocking up on filters because those filters can trap a lot of moisture.


How are these systems prone to moisture buildup?


Speeco 25 Ton Log Splitter Manual

Page 10, Item 16, Part No. 3903750, Dip Stick/Breather Cap


"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Mixing hydraulic fluid and ATF [Re: MolaKule] #5288866 12/08/19 07:44 PM
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dlundblad Offline OP
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Originally Posted by MolaKule
Originally Posted by dlundblad
Originally Posted by MolaKule
Originally Posted by dlundblad
Thanks.

... Somewhat surprising it came with such a thick oil since you’d think anyone splitting wood would be in temps much colder.


The fluid that it came with should have the same viscosity as a Dex/Merc ATF since it specs an ISO46 fluid.

I suggested stocking up on filters because those filters can trap a lot of moisture.


How are these systems prone to moisture buildup?


Speeco 25 Ton Log Splitter Manual

Page 10, Item 16, Part No. 3903750, Dip Stick/Breather Cap


This is what I was guessing, but I wanted to make sure.

It’s garage kept and will never see rain so that should help.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

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