full hydro cooling issues

1983Bronco

1983Bronco

Well-Known Member
Joined
Apr 10, 2005
Location
On your mom in Winston Salem NC
my buggy has a full hydro with a psc pump and resorvior on a toyota rig, after trail riding for a little bit the reservoir gets pretty damn hot and starts wining and the steering gets slow as in it takes alot longer to respond, it has some kind of purple fluid in it now, it has all AN fittings and I don't want to go top the trouble of hooking up a cooler because of the fittings. It probably needs a flush anyway, so I have heard alot of about the Amsoil Synthetic Tractor Hydraulic/Transmission Oil
SAE 5W-30 (ATH). I heard it works great with full hydro set ups. Has anybody ran this stuff? Thanks
 
How much oil does your system hold?
 
It's the PSC pump. If you can , you need to either put a stock pump on it or put a bigger pulley for the PSC pump to slow it down.
 
You need a cooler. The electric fan for mine stopped working (bad relay) at the last DPG ride and mine started acting up and getting very loud.
 
x2 on the cooler.
 
Also take a look at your plumbing! If you install a cooler with a fan but stil run hot check your fitting usage and hose routing! Resistance builds pressure and heat.
 
Google it and you will find a thread on pirate about it. They suggest amsoil hydrolic tractor transmission fluid. I did it and never had any problems since.
 
GubNi said:
Google it and you will find a thread on pirate about it. They suggest amsoil hydrolic tractor transmission fluid. I did it and never had any problems since.
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Do u run a cooler also where can I get hoes with an fittins thanks
 
If it's happening over time capacity or cooling is probably the answer. Your reaching the working limits of the fluid and its thermal dynamic properties are leading to some of your problems. Once the whining gets excesive the fluid is becoming so cavitated it doesn't flow in the hydraulic circuit effectively. For me, I found that to long of a suction line and one size small was enough to create issues. On the suction side lenght plays a role on how effective the fluid travels. Less efficiency means more turbulence. This equals cavitation and heat build up. All pumps create cavitation. How well its transfered and controlled make the difference. If any of your lines vibrate with noise or not you got excess cavitation. Cavitation also can occur with the absence of air, its actual more about how the fluid is acting rather than air bubbles. Cavitation makes heat along with the flow of fluid and the resulting friction. The way some large industrial systems combat this gradual heat build up is through very large resevoirs. We don't have the luxury of space so coolers and a very optimised system is the best way to combat the issue. As for fluid I run the Ams Oil. Its actually a little heavier viscocity than alot of other fluids but I believe has alot of other properties that make it superior to other brands.
 
WARRIORWELDING said:
If it's happening over time capacity or cooling is probably the answer. Your reaching the working limits of the fluid and its thermal dynamic properties are leading to some of your problems. Once the whining gets excesive the fluid is becoming so cavitated it doesn't flow in the hydraulic circuit effectively. For me, I found that to long of a suction line and one size small was enough to create issues. On the suction side lenght plays a role on how effective the fluid travels. Less efficiency means more turbulence. This equals cavitation and heat build up. All pumps create cavitation. How well its transfered and controlled make the difference. If any of your lines vibrate with noise or not you got excess cavitation. Cavitation also can occur with the absence of air, its actual more about how the fluid is acting rather than air bubbles. Cavitation makes heat along with the flow of fluid and the resulting friction. The way some large industrial systems combat this gradual heat build up is through very large resevoirs. We don't have the luxury of space so coolers and a very optimised system is the best way to combat the issue. As for fluid I run the Ams Oil. Its actually a little heavier viscocity than alot of other fluids but I believe has alot of other properties that make it superior to other brands.
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Damn homie, I feel like I'm back in college, you layeth down the knowledge! Thanks for the info, guess I'll get a cooler
 
GubNi said:
I installed a cooler first, but it didn't help me. The amsoil cured my problem.
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How hot does your system get?
 
you can find big oil coolers on ebay all the time - Roundy-round types use them.. I got a 12x12 with 1/2" NPT fittings for $35. 1/2" to -6 JIC adapter fittings were just a few bucks, and then Alliance can make you up some hose.

The fitting size is important. use the biggest cooler fittings you can find. If it's got 1/2" NPT fittings, you know there's big enough passages in the system to not be a bottleneck.
 
1983Bronco said:
Damn homie, I feel like I'm back in college, you layeth down the knowledge! Thanks for the info, guess I'll get a cooler
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I read a whole lot and type way to much, sorry.
 
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