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Old 09 January 2017, 07:36   #1
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Oil for PTT unit

I am in the process of changing oil seals in the PTT unit. A review of the e-tec manual says that an evenrude type oil should be used to avoid damage to the seals. I intend to use ATF fluid as a hydraulic ram is a hydraulic ram irrespective of weather it is on an OBM or a track machine. What do you think?

TSM
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Old 09 January 2017, 07:50   #2
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I would do the same I wouldn't think a ptt would see the same load and heat as a digger
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Old 09 January 2017, 08:59   #3
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I would do the same I wouldn't think a ptt would see the same load and heat as a digger
And that's the point - often "marine" oils have additives to deal with moisture ingress.

Hot hydraulic oil recirculating around a digger hydraulic system will be dried of any moisture ingress.

I'd look for any branded outboard or sterndrive PTT oil.
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Old 09 January 2017, 11:49   #4
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I kind of doubt that marine PTT oil is anything other than standard hydraulic fluid. Its purpose is simply to be non-compressible (as is water.)

Lubricating oils (crankcase oil, lower unit gear oil), yes, having something that emulsifies the water into the oil and keeps some lubrication there is a good idea.

Note that this is a guess; don't have any proof of this.

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Old 09 January 2017, 12:05   #5
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Quote:
Originally Posted by two stroke mick View Post
I am in the process of changing oil seals in the PTT unit. A review of the e-tec manual says that an evenrude type oil should be used to avoid damage to the seals. I intend to use ATF fluid as a hydraulic ram is a hydraulic ram irrespective of weather it is on an OBM or a track machine. What do you think?

TSM
Mick dont used TQF/ATF steering oil in place of hydraulic oil as hyd oil has special wear preventing additives you could use the Citroen hydraulic/steering LHM oil would work fine or regular hydraulic oil from a motor factors
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Old 09 January 2017, 15:42   #6
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I've used light engine oil 10/40 or 5/40, atf and hydraulic oil and they've been fine, at the end of the day it's a hydraulic motor and a couple of rams nothing special as long as you don't mix synthetic and mineral you'll be fine put in what you have on the shelf
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Old 10 January 2017, 00:57   #7
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I have used car power steering fluid with no problems at all
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Old 10 January 2017, 08:44   #8
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You could use water washing up liquid brake fluid or almost any fluid as they don't compress, why make a product specifically for hydraulics if you can just use any old oil ? Yes you could put other oils in and it will work.
I'm just saying like
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Old 10 January 2017, 09:12   #9
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I've used light engine oil 10/40 or 5/40, atf and hydraulic oil and they've been fine, at the end of the day it's a hydraulic motor and a couple of rams nothing special as long as you don't mix synthetic and mineral you'll be fine put in what you have on the shelf
What is the problem with mixing the two types of oil?

TSM
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Old 10 January 2017, 09:22   #10
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TSM you can end up in all sorts of bother with slugging separation advanced seal failure
Plus being out in the water you would be better with a biodegradable hydraulic oil
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