Low visosity hydrolic fluid

[SPYDERLK]

At 5 PSI???? You could use a centrifugal pump, instead of positive displacement. I may be missing something here.

I missed the 5 PSI. Hard to imagine that as a hydraulic application.
larry

 

[mmurphy]

I missed the 5 PSI. Hard to imagine that as a hydraulic application.
larry

I think we are missing what the whole concept is about. I was wondering also if this was a typo.

 

[J_J]

He only has one post. He may be playing with you guys.

 

[Mace Canute]

An ISO-VG(viscosity grade) Grade 22 hydraulic oil is equivalent to an SAE Crankcase Oil Grade 5W.

From Industrial Lubricants - Viscosity ISO-VG Grade

 

[glastron23]

on our bucket trucks up here in Canada we use Exxon Univis J13, it's an aircraft hydraulic oil for cold weather. Some of the trucks that come from the southern states will use a 22 grade oil, put this at -25 and it flows like tar, we change all our trucks to J13 for year round service, it's a little thin for extended hot weather use but thats normally not a problem for us. Jim

 

[Rocwin]

In our bucket trucks the standard oil we use is a 22, we can a dyed blue (arctic) oil with a 15 weight to it for use in winter weather or pilot operated valves. I haven't seen anyone using lower, and I don't think I'd recommend it, you'll start to lose the properties of oil in general when you approach the viscosity of water.

 

[glastron23]

Hi Rocwin... we work on your trucks (RH aerial) as well as others, posiplus, versilift, wajax, telsa, Utem, duralift, etc. for the last 20 years the only oil we spec is J13, the odd one will come in with ATF but that's mostly digger derricks.
We have very few problems with J13 unless some mixes in ATF, then in cold weather you will get tank foaming ( the base stocks are different and will not mix when cold) you may want to check the specs on the oil, you will be surprised at it's properties. Jim

 

[PILOON]

Meyers snow plows are a problem in cold weather.
Most users I know use automatic transmission fluid (ATF).*
Works great!

*ATF is hydraulic flud, just thinner than our tractor 'universal' type.

 

[Mace Canute]

In our bucket trucks the standard oil we use is a 22, we can a dyed blue (arctic) oil with a 15 weight to it for use in winter weather or pilot operated valves. I haven't seen anyone using lower, and I don't think I'd recommend it, you'll start to lose the properties of oil in general when you approach the viscosity of water.

FYI, the viscosity of engine oil when it reaches operating temperatures is very close to the viscosity of water.

 

[Rocwin]

Thanks Glastron23. I just took a look at the spec sheet for the J13 oil and ours performs a bit better. The J13 has a VI of 300 (resistance to viscosity change with temperature) while our MV15 is 356 and the viscosities are very comparable otherwise. Our normal oil MV22 does well with 253 VI for our temperatures, but like I mentioned there are issues with very small lines on some equipment. When the UTEM booms come here from Texas they'll put a 32 oil in them, we make sure to order those empty so we can put our own in, during winter they become unusable.

Engine oil and hydraulic oil serve two different purposes, hydraulic oil is used to transmit power while engine oil is used as a solvent and lubricant which is actually pretty close to water (without the rust.)