** hydraulic filter ** as AT trans filter ???!?

[fafnir]

hi, does anyone know the pressure drop for one of them 35 GPM hydraulic filters that filter down to 10 microns?

say specifically the one on northern tool?

because if the pressure drop was small enough it would be the best external full flow spin on transmission filter i can find, would out filter magnafine's by at least something like a 10x margin

or can someone recommend a better solution or a better filter or have experience using one of these things or something similar to it?

thanks for the time



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[Gary Allan]

Unless you've got some real dirty fluid, I'd expect a hydraulic filter to last years without any substantial pressure drop.

Read this:

https://bobistheoilguy.com/forums/threads/aux-spin-on-transmission-filters.48488/

 

[fafnir]

ok, so if i were to pick the mcmaster-carr 4358K43 filter with a 5 micron rating it should be the best bet right?

assuming if i go for 30k mile fluid changes, on a 6L80, with severe duty usage, heavy towing, etc and a giant trans cooler my trans should be safe for a while right?

thanks for the time

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[unDummy]

If the mount doesn't have a bypass, I'd preferred a higher-micron rating, a mount with bypass, or a filter with bypass.
Is bypass needed? probably not but I'll lean on the safeside always since ATF flow amount and temp is variable.

Use the northern tool filter head. Doesn't the mcmastercarr filter seem a little expensive? Why not just permacool it?

On a hot tranny, compare the ATF hot idle flow through the cooler line with any filter connected and disconnected. If quantity flow drop in a minute is excessive, then pick a different filter. 5 micron might be too small for a full flow. This isn't a small tranny with low flow.

If you want fine filtering, use a bypass filter.
A full flow is a full flow and should be used as such.

Those Fordaguar oil filters with bypasses are excellent choices. Their micron rating might not be too small to brag about, but they'll filter well enough, have a bypass, and have several brands/sizes to choose from.

Slap a couple filtermags on the filter you choose and you'll be safe, assuming there are no issues with the tranny.

 

[fafnir]

well, i went around with doing the unreasonable - measuring the line pressures of the transmission i'm intending to use this with, and it turns out its at least 20 psi on the lowest pressure idle i can find - when hot - pre-cooler

and the northern tool filter has a bypass at 15 psi, which although may not activate against the flow at all due to not enough pressure drop, etc, but once the filter gets any action at all, it should be enough to trip the bypass

at least in theory

and even if that particular filter runs $120, a new 6L80 trans runs at least $2500, and rebuilds are kinda finiky for these right now anyways

i've come from rebuilding a bunch of transmissions that when i bought them were told they were "bulletproof" and "indestructible" at less than reasonable mileages



so what i was really trying to ask with this thread and post was about the general pressure drop of a hydraulic filter, the fluid compatibility, and temp resistance of the hydraulic filter


and if anyone's had any catastrophic failures with these on; lets say 30k miles fluid changes, a giant trans cooler w/fan on top, and amsoil atf or whatever sick synthetic blend of DEX-VI or the stuff there is that should be the best goo money can buy

thanks again for the time



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[Tempest]

Check out page 4 & 5 of link that Gary provided.

 

[Gary Allan]

fafnir

Go for it, man. This is one place overkill was made for. I think that you're too much focused on flow issues that aren't apparent in use ..but that's okay. For your money, you can get a bypass and a full flow setup and focus more on the filtration aspects of the setup ..but the choice is surely yours.

You can often find REALLY HEAVY DUTY hydraulic filter setups on Ebay for way salvage.

Put 140005394480 into the ebay search engine.

Here is the spec of that filter in a WIX


zoom

Part Number: 51746
UPC Number: 765809517462
Principal Application: Cat, Ford/New Holland Equipment (5 Micron)
All Applications
Style: Spin-On Hydraulic Filter
Service: Hydraulic
Type: Full Flow
Media: Paper
Height: 6.872
Outer Diameter Top: 5.007
Outer Diameter Bottom: Closed
Thread Size: 1 1/2-16
By-Pass Valve Setting-PSI: None
Beta Ratio: 2/20=2/7
Burst Pressure-PSI: 335
Max Flow Rate: 28-30 GPM
Nominal Micron Rating: 5

Gasket Diameters
Number O.D. I.D. Thk.
15386 5.072 4.692 0.187
15661 8 5.030 4.440 0.190
15859 8 4.762 4.484 0.139

You can get the right fittlings for chump change with your savings. Buy two ..they're cheap. Buy a preloaded check valve with whatever bypass pressure you desire. This filter is massive and is designed to handle very high flow at fine levels of filtering. I'm sure that there's a micro-glass offering in the thread/gasket size ..but I can't see it trumping 5um nominal.

Here's one I just bought for $19 delivered. It will cost me more to adapt it than to buy the thing.

stuff like this comes up all the time

Part Number: 51759
UPC Number: 765809517592
Principal Application: Various Hydraulic Applications (Hydraulic Version of 51758) (10 Micron)
All Applications
Style: Spin-On Hydraulic Filter
Service: Hydraulic
Type: Full Flow
Media: Paper
Height: 6.872
Outer Diameter Top: 5.007
Outer Diameter Bottom: Closed
Thread Size: 1 1/2-16
By-Pass Valve Setting-PSI: None
Beta Ratio: 2/20=18/38
Burst Pressure-PSI: 360
Max Flow Rate: 28-30 GPM
Nominal Micron Rating: 10

Gasket Diameters
Number O.D. I.D. Thk.
15415 5.140 4.750 0.195
15658 8 5.055 4.480 0.359
15661 8 5.030 4.440 0.190

 

[fafnir]

i do have another off topic question for you Gary, and thats it would be your recommendation that amsoil is a better bet than the stock DEX VI right?

i'm coming up to another fluid change soon and i need to know if i can do better

cost of the fluid is irrelevant

thank you


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[mechtech2]

Heat weakened trans oil is by far the biggest killer of auto trannys. Debris is down on the list.
How about a simple in line filter that the trans rebuilders use? Our main rebuilder requires it to be installed for the warranty to be good.

 

[Jim Allen]

I'd advise a bypass, having experienced a tranny failure due to a clogged filter. The hard parts go fairly quickly.

 

[Tempest]

Originally Posted By: fafnir
i do have another off topic question for you Gary, and thats it would be your recommendation that amsoil is a better bet than the stock DEX VI right?

Dex VI is an excellent fluid. I would use it if your trans is spec'd for it. Fairly cheap, too.

 

[kd5byb]

Originally Posted By: Jim Allen
I'd advise a bypass, having experienced a tranny failure due to a clogged filter.


Hi Jim,

What type of filter clogged up on you? Was this an external hydraulic-type filter or a suction filter inside the tranny?

thanks much,
ben

 

[Jim Allen]

kd5byb: I have had two "unfortunate incidents" that fit this topic

1) Had a buddy help me install a new tranny in one of my project rigs. I got hold of B&M's inline filter kit, which used an ordinary engine oil filter. This filter had an ADBV and my buddy hooked up the cooler lines the wrong way, totally blocking oil flow. The tranny went all of 19 miles before packing it in completely. It was a total write-off.

2) Had a similar thing happen to a '63 Chrysler in the early '70s, after I installed an inline tranny filter (the type that looks like a giant fuel filter). I had a '62 Chrysler that had the inline filter but the '63 did not. I thought I was doing something good, but despite the fluid looking good, there was stuff going on inside it and the filter plugged some 250 miles later and the tranny died soon after that. It was a $50 car so I just put in a used gearbox and didn't look back. I did not determine what the "chicken" was in that scenario, but the egg was a totally blocked filter. In many trannies, the cooler fluid goes back to lubricate the hard parts.

 

[fafnir]

wait, so a 43 PSI bypass on the macmaster filter is too high or something?

the line pressure is well over 100 psi, and even at idle its fairly high

would the higher bypass be a definite problem?


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[unDummy]

Bypass and line PSIs are two differnent things.
I would want a bypass below 20psi.

 

[oilboy123]

Has anyone thought of using a Amsoil EAO oil filter as a trans filter?

It seems like the capacity and low micron filtration would make it tempting......

 

[ConfederateTyrant]

Quote:
Has anyone thought of using a Amsoil EAO oil filter as a trans filter?

I just installed a B&M kit on my transmission (there's a write-up in the oil filter section), and next year I am going to replaced the supplied B&M filter with an Amsoil EAO15 filter. Not sure if anyone has done so yet though.