having problems with my hydrolics on my kabota 1500 bucket doesn't want a lift any weight and moves very slowly when tractor is more
where are the pressure relief valves on a kabota b 1500
- Thread starter dleath2003
- Start date
More details on your tractor please.
Is the loader using the main Kubota pump or does it have a pump driven off the front of the engine crankshaft and with its own oil supply?
Does the 3 pt hitch pick up the usual weight or is it too struggling.
Have you removed and cleaned the suction screen?
These next two images are from a B2710 but will be almost identical to your tractor.
Does your loader have quick connects for the lines to the loader cylinders?
Is your loader fed from a hydraulic block?
Investing $30 in a 0-3,000 psi pressure gauge would be a good idea.
Once you have answered the questions more comments can be provided
Dave
the loader is using the main kabota pump, 3 point hitch and mower deck is acting sluggish, lower cylinders are threaded but from the pump to the lever control valve have quick disconnect, not sure what you mean by a hydraulic block feeding the loader, i do have a 0 to 5000 pressure gauge but i need fittings to adapt to take pressure readings. the problem originated when my neighbor accidentally dumped approximately about a court of weed killer that was in a hydraulic oil can after blowing a couple hoses from the loader. sinse then i ve had a constant problem with the filter screen gumming up with a white substance which i imagine is a water or some type of moisture. sense that time i have replaced all the hydraulic roses and have tried to clean all the moisture out of the system, and have flushed it 3 times with kabota hydraulic fluid
Last edited:
This illustration is from a B1550 but I expect the hydraulic block will look similar.
Do the lines to your loader valve originate from something like this.?
Have you cleaned the suction screen?
Dave
i cleaned what i thought was the suction screen but mine didn't have a pipe coming out the end it was just a not with a spring loaded screen similar but figure 7 is a rubber hose going back up into the engine compartment. i am at a loss because i do not have a part orientation pur the numbers. and seeing as i do not have a computer it is very difficult to look this up, because my smart TV will not open up pdf files
Last edited:
Can we go backwards for a minute.
In your post you said you had a 1500 but in your profile I now see you actually have a B1550 so I was confused.
Which model of B1550 do you have? Does it have a hydrostatic transmission or a manual gear shift? Is it two or four wheel drive?
Which pdf's are you wanting to see. I can turn them into pictures if that will help.
Dave
i have a b 1550, 4 wheel drive it's a 6 speed 3 gears plus reverse high and low, model 1550d pictures would be great
I do not have a B1550 to take pictures of.
What I was offering to do was to go to web sites and instead of down loading pdf files to post, I would take screen shots which then would be in my posts as images like the first two I posted of the suction screen and suction pipe.
Dave
honestly anything would help, my smart TV isn't so smart and will not open the pdf file so i can read them, my phone will however they are too small and i can not print them out to make them bigger. my dad always told me don't get old now i m understanding why.LOL thank you so much for the time spent and trying to help you don't know how much i appreciate it.
I did get it.
Go back to post #2, the one right after your initial post. In that post were two parts "photos." One was of an actual suction strainer and the other was a parts illustration showing where the suction strainer is located. Neither of those were pdf files. Could you see them clearly?
When hydraulics start to operate poorly, the suction screen is the first thing to check.
Dave
yes i have cleaned the suction screen, it seems to be full of a milky white substance. that's why i would like to know where the pressure relief valves are to make sure they're not blocked.
If your hydraulic fluid is that color it has water in it and a complete change is called for.
The main relief valve is in the hydraulic block which was a photo I posted earlier.
Your pump may be bad from trying to work with a water contaminated fluid.
The likelyhood of the relief valve being blocked by watery fluid is very low.
There is a second relief valve incorporated into the control valve for the 3 pt hitch
Dave
You said that you’ve flushed the system 3 times and the oil is still milky.
Let me ask a dumb question.
Are you sure that you are removing every drain plug and draining the entire system?
I’m not familiar with your B1550 but I know my L4310 has several drain plugs. If you aren’t getting all of the oil drained out, you’re immediately contaminating the fresh oil when you pour it in. A little contamination goes a long way.
to my knowledge yes i have removed all the hydraulic oil fluid. the suction screen has the milky white fluid but also has little bit of sand like particles. i'm not saying it's sand that's just the size and shape. it probably is the pump but i m going or should i say hoping i don't have to change it.
Just be careful to not dead head the pump by keeping a relief valve between the pump and the gauge
Dave
Two aspects of your posts confuse me.
In the beginning you said the 3 pt worked but slugishly.
With 400 psi I would not think it would lift much weight at all.
I am concerned about where and how you measured the 400 psi because if it is really that low a new pump is needed.
Dave