Not a physics or Math problem but a hydraulic problem

Mtjohnso

Member
Have a Satoh Mitsubishi Buck track with a front loader.
When I first got the tractor form my dad the hydraulics was slow when raising the bucket. The problem then was that the filter screen in the transmission, where the fluid comes from, was plugged. So I cleaned the filter on two occasions and changed the fluid twice.
So I drained the old fluid a few days ago, thinking that the screen was plugged again.
The screen was clean.
When I start up the tractor it takes about a minute before the bucket starts to move. I am wondering if the pump is getting worn out. I probably need to put a pressure gage on the output of the pump and then on the input to the control valves.
Any thoughts on what can ne occurring here.
Where does one buy the gauge for measuring the hydraulic pressure in a system?
 
What's the temp where you are?

What grade of oil?

Any moisture in the oil?

Thick oil works in old worn pumps and leaky systems so we use that in summer, but is stiff when its cold, and extra so with any condensation in it over the years.....

Paul
 
Temp here is about 45
There was water, condensation, in the previous oil that was drained out.
The new oil put in was from a bucket that said standard hydraulic oil. Do not remember numbers on it.
Are you suggesting that the oil might be too thick, heavy?
 
Probably not at 45 degrees. Where I am we have been single digits, below zero one night, then it shows up for sure.

At your temp, it shouldn't be too thick.

Paul
 
Say, did the bucket say hydraulic oil, or trans-hydraulic oil? You would want the trans hyd oil in the type of setup you describe, standard hyd oil doesn't protect the tranny parts good enough?

Paul
 
There should be gauges available online or at Grangers or similar outlets. The most accurate gauges are those that have oil in the gauge to stabilize the needle for an accurate reading.

Is there any noise to the system when the pump is running. Cavitation will usually make a howling sound. Air in the system will make it somewhat jerky and inconsistent.

There could be valve that is dumping pressure, even if there is a good flow of fluid. Is the system slow on all circuits? You may need to do a systematic test of all valve ports to determine flow and pressure.
 
Most any hydraulic fluid will work for hydraulics, you get in trouble with wet clutches and brakes if not correct.

I do not think you have a fluid issue, would suspect pump is shot. You need to get a service manual and follow that.

We are just wandering here.
 

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