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Viscosity and temperature #5425835 05/10/20 08:13 PM
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Sniffy Offline OP
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Hi Everyone,
First post.
I have a 2008 Bobcat v518 telehandler that has a bit of a heating issue after prolonged use. In temperatures above 75-80f driving around with the hydro-static drive will cause the oil temps to heat up. I'm currently using fresh AW46 oil and the previous oil sample didn't show any issues. It has under 2000hrs. Should I be using AW68?
My question is- In a hydraulic system will the temps rise due to the heavy weight of an oil or too light?

ie; Light weight oil causing leakage/bypass friction from shearing, or heavy oil causing friction due to flow resistance?

I don't have to worry about cold temps, and the summer temps are in the high 80's or low 90's max. Very moderate temps here in the PNW.

Re: Viscosity and temperature [Re: Sniffy] #5425870 05/10/20 09:03 PM
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walterjay Offline
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I can't speak to the issue of what oil to use, but have you made sure that the oil cooler and radiator are completely clean? I have seen equipment overheat due to dirty cooling fins.

Re: Viscosity and temperature [Re: Sniffy] #5425900 05/10/20 09:45 PM
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double vanos Offline
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Can’t say I’ve got an answer for you but welcome

Take your seat in the asylum...


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: Viscosity and temperature [Re: Sniffy] #5426019 05/11/20 05:50 AM
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WyrTwister Offline
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Doubt if relevant , but I worked at a foundry in the 1970's that had a bobcat front end loader . It used Dexron ATF for hydraulic fluid .

Can you get / do you have a factory manual for it ?

I like the idea of checking the oil cooler , radiator and fan .


Wyr
God bless
Re: Viscosity and temperature [Re: Sniffy] #5426081 05/11/20 07:27 AM
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A_Harman Offline
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How hot is the oil getting?


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: Viscosity and temperature [Re: walterjay] #5426462 05/11/20 02:00 PM
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Sniffy Offline OP
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The oil slowly will climb the gauge so when it gets too high i go for an extended coffee break. Having a background in the auto industry I have been minding the rad/cooler cleanliness and keeping the fins straight with an AC comb. Not much of a change in the problem.
From the manual (which comes in half French- randomly placed- over the important stuff)

"If (bobcat) fluid is not available, use 10w30 or 10w40 SAE Motor oil (5w-30 for 0*F [-18*C] and Below).
Do not use automatic transmission fluids in the Versahandler or permanent damage to the transmission will result."

Currently I have AW46 in it.

Re: Viscosity and temperature [Re: WyrTwister] #5426469 05/11/20 02:10 PM
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Sniffy Offline OP
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According to this chart I should be using AW100 ?


[Linked Image]

Re: Viscosity and temperature [Re: double vanos] #5426474 05/11/20 02:16 PM
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Sniffy Offline OP
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"Take your seat in the asylum..."

Thanks, but if you knew this machine you would realize that you're in MY asylum now..... hide

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