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Kubota RTV 900 transmission problem - hardley moves in gear!
- Thread starter PACKASAURAS
- Start date
It was like new, the acceleration was fast and smooth. Low, medium, and high gear function as I expect. It has been 3 years and still runs good.Hello everyone. i have a problem with hst but i have a question for dmatlock2. how much time after folding it was driving at speed 25? Because my RTV, when I put it together and I want to go, it goes to LM and it's hard to move on H. she is generally poor
Hi All,
I'm new here, sorry to bring up an old thread but I've found the information in here quite helpful.
I've got an RTV900, got it about 5 years ago with approx 4000 hours on it.
We use it now and again, perhaps once or twice a month, or sometimes it just sits in the shed for a couple of months. I serviced it not long after we got it and the date written on the filters was 10 years old so it doesn't seem like it's been serviced a lot.
I got some new filters / transmission oil and serviced it, as it wasn't great going uphill. This made a bit of an improvement but it's still wasn't great. It's probably done around 100 hours since then.
The brakes don't work, the front left pack is missing and the mater cylinder was missing. I've just bought the stuff to hopefully sort this as well.
(just in case someone thinks the brakes could be sticking on).
I've pulled the tipping bed off, as it was pretty rotten. So while I'm rebuilding that and thought I'd try and figure out why it's so slow going uphill especially with a load on it. I'd say around walking speed with your foot to the floor, and I would think it should go faster than that.
It's like half revs or full revs makes no difference, it just goes pretty much the same speed uphill.
It doesn't seem too bad on the flat and goes quite fast once it gets going. It just seems very slow going up hills, although it does still get there eventually, just very slowly.
So I just thought that must be the way that Kubotas are, as I've not driven one prior to this, but from reading some posts it seems that other people have had similar issues.
I decided to pull the transmission apart and check the 3 brass plates which were quite worn and had a lip on them which you could feel with your fingernail. I ordered 3 new plates and fitted them today and gave it a test up the driveway (two of us in it, no bed on the back), and it seems to be pretty much exactly the same. So the new plates haven't made any improvement.
While I was in there I checked the pistons and springs on the pumps and they all seem ok and not badly worn or anything, no grooves in the sides.
I don't have any gauges to measure the pressures, and even if I did the pressure measurement ports seem seized solid.
I did try to remove them and one rounded off, and the other nearly snapped my allen key socket (it would have if I'd put any more pressure on it) so I'm unable to test pressures even if I had the gauges.
It seems to have a bit more torque in reverse then in L, not sure if that's helpful info.
If I put the handbrake on full, and put it in L and rev it, it will rev. It does load the engine a bit, but doesn't stall or anything.
I noticed that someone had an issue with the inner swash plate which had a pin broken / elongated and I'm wondering if this one could be the same?
I'm not sure how to check that, can it be checked by removing the top part of the transmission where the actuator for the throttle goes.
The back of the exhaust is missing so it's not the spark arrester.
I'm just wondering what I should look at next?
Thanks in advance
Mick
I'm new here, sorry to bring up an old thread but I've found the information in here quite helpful.
I've got an RTV900, got it about 5 years ago with approx 4000 hours on it.
We use it now and again, perhaps once or twice a month, or sometimes it just sits in the shed for a couple of months. I serviced it not long after we got it and the date written on the filters was 10 years old so it doesn't seem like it's been serviced a lot.
I got some new filters / transmission oil and serviced it, as it wasn't great going uphill. This made a bit of an improvement but it's still wasn't great. It's probably done around 100 hours since then.
The brakes don't work, the front left pack is missing and the mater cylinder was missing. I've just bought the stuff to hopefully sort this as well.
(just in case someone thinks the brakes could be sticking on).
I've pulled the tipping bed off, as it was pretty rotten. So while I'm rebuilding that and thought I'd try and figure out why it's so slow going uphill especially with a load on it. I'd say around walking speed with your foot to the floor, and I would think it should go faster than that.
It's like half revs or full revs makes no difference, it just goes pretty much the same speed uphill.
It doesn't seem too bad on the flat and goes quite fast once it gets going. It just seems very slow going up hills, although it does still get there eventually, just very slowly.
So I just thought that must be the way that Kubotas are, as I've not driven one prior to this, but from reading some posts it seems that other people have had similar issues.
I decided to pull the transmission apart and check the 3 brass plates which were quite worn and had a lip on them which you could feel with your fingernail. I ordered 3 new plates and fitted them today and gave it a test up the driveway (two of us in it, no bed on the back), and it seems to be pretty much exactly the same. So the new plates haven't made any improvement.
While I was in there I checked the pistons and springs on the pumps and they all seem ok and not badly worn or anything, no grooves in the sides.
I don't have any gauges to measure the pressures, and even if I did the pressure measurement ports seem seized solid.
I did try to remove them and one rounded off, and the other nearly snapped my allen key socket (it would have if I'd put any more pressure on it) so I'm unable to test pressures even if I had the gauges.
It seems to have a bit more torque in reverse then in L, not sure if that's helpful info.
If I put the handbrake on full, and put it in L and rev it, it will rev. It does load the engine a bit, but doesn't stall or anything.
I noticed that someone had an issue with the inner swash plate which had a pin broken / elongated and I'm wondering if this one could be the same?
I'm not sure how to check that, can it be checked by removing the top part of the transmission where the actuator for the throttle goes.
The back of the exhaust is missing so it's not the spark arrester.
I'm just wondering what I should look at next?
Thanks in advance
Mick
So? Your 5 year old service has 100 hours on it?
Pretty much. It might be 150 hours? but I doubt it.So? Your 5 year old service has 100 hours on it?
It sits in the shed most of the time, and only get's used now and then if I need to move logs or stone or something. We have another machine Avant 523 loader which gets (pretty much every day) and we've had that around the same length of time 5 years from new. That only has 224 hours on it.
Well I managed to heat the pressure test ports up with a blowtorch and hammer a Torx bit into them and remove them. (I'll order some new replacements plugs when I order some other parts I need).
I Ordered a set of gauges, which arrived today.
I'm not sure how this has even been driving as I seem to have 0 psi on the charge pump port. Even when revving it, nothing.
I disconnected the gauge and oil does slowly come out of the pipe going to the gauge (thought it might be blocked) but not squirting out or anything.
I did briefly try the high pressure side (while the wheels where off the ground as it's currently jacked up) and it showed around 800psi (although not a proper test as I didn't want to chance damaging anything).
I've got new Kubota filters and oil which I ordered the same time as the replacement pump plates but I've yet to fit them as wasn't sure if I need to pull this all apart again and do further investigations, and didn't want to waste all of the new oil I've just bought.
I've done a lot of reading over the last few days, to try and get my head round how the system works which I think I understand now.
One thing I've noticed is that you seem to have to rev it quite hard (to about 30%) before it does anything, but it's always been like that, so I thought that was normal? Still not sure if it is?
I did remove and check the high pressure relief valves and they seemed fine, and verified that the servo piston moves which it does when the engine is running, although I can only check this for a few seconds as the chamber fills with oil after a few seconds.
Not sure what to do next, was thinking of checking the hoses from the suction side, charge pump relief valve, or could it be the charge pump?
I Ordered a set of gauges, which arrived today.
I'm not sure how this has even been driving as I seem to have 0 psi on the charge pump port. Even when revving it, nothing.
I disconnected the gauge and oil does slowly come out of the pipe going to the gauge (thought it might be blocked) but not squirting out or anything.
I did briefly try the high pressure side (while the wheels where off the ground as it's currently jacked up) and it showed around 800psi (although not a proper test as I didn't want to chance damaging anything).
I've got new Kubota filters and oil which I ordered the same time as the replacement pump plates but I've yet to fit them as wasn't sure if I need to pull this all apart again and do further investigations, and didn't want to waste all of the new oil I've just bought.
I've done a lot of reading over the last few days, to try and get my head round how the system works which I think I understand now.
One thing I've noticed is that you seem to have to rev it quite hard (to about 30%) before it does anything, but it's always been like that, so I thought that was normal? Still not sure if it is?
I did remove and check the high pressure relief valves and they seemed fine, and verified that the servo piston moves which it does when the engine is running, although I can only check this for a few seconds as the chamber fills with oil after a few seconds.
Not sure what to do next, was thinking of checking the hoses from the suction side, charge pump relief valve, or could it be the charge pump?
If the charge pressure is low nothing will work right.
Yes, I know. What is the likely cause / possible causes of low charge pressure?
I made a mistake with my initial post but couldn't edit it. I got mixed up with the mini digger we have which has the 4000 hours on it, the Kubota has 2231 currently and had around 2114 on it when we got it (it came with the farm).
It's still running about the same as when we first got it( when I changed the oil and filters (genuine and genuine fluid) from the dealer. So I don't think filters and oil are the problem, although I could still change them as I bought new ones, and new oil.
Are there seals in the charge pump?
I couldn't find much info / pictures on the internet of one in bits.
It seems to be around £280 for one.
It looks like it can be changed by removing the axle, and the right hand rear brake assembly, is this correct?
I'm just wondering what to check / change / how to proceed with this.
I made a mistake with my initial post but couldn't edit it. I got mixed up with the mini digger we have which has the 4000 hours on it, the Kubota has 2231 currently and had around 2114 on it when we got it (it came with the farm).
It's still running about the same as when we first got it( when I changed the oil and filters (genuine and genuine fluid) from the dealer. So I don't think filters and oil are the problem, although I could still change them as I bought new ones, and new oil.
Are there seals in the charge pump?
I couldn't find much info / pictures on the internet of one in bits.
It seems to be around £280 for one.
It looks like it can be changed by removing the axle, and the right hand rear brake assembly, is this correct?
I'm just wondering what to check / change / how to proceed with this.
On the old rtv900 transmission there's a hose that serves the suction supply for the charge pump that was known to collapse internally and cause your issue. With the age of your machine i would replace the hoses first. And might be an idea to also replace the suction filter.