Hi there all! I have a serious problem with my B1700 HST
It is not a new machine but has given many years service.
I suspect my problem is self inflicted through stupidity.
At a job I caught a hydraulic line and lost a lot of fluid. I HAD to get the machine home because I HAD to do anther job the next morning so I topped up with some used engine oil from my Jeep. I keep the Jeep oil very clean so it was only six months old and a bit sooty. Yep Dumb but it got me home where I drained all the oil, fixed the leak, topped up with new oil and forgot the whole thing. Some weeks later the machine was very reluctant to move one morning. It had been fine the day before, but now it acted like it had no trans fluid in it.
When I checked there was oil . BUT I remembered the dirty stuff I had put in , so I checked the cartridge filter and sure enough it was black inside so I washed it with petrol and put it back and things were better but not best.
I spoke to KUBOTA who said that a bit of dirt in the filter would not affect anything as it was on a return line, and that as I had an old machine the charge pump was probably worn. (By carbon in the oil?) This sounded OK apart from the fact that the machine went wrong over night. Literally. Now some months later it is still the same. It goes, it moves, but high ratio is a no no except on level ground, and in low the machine won't climb well. It goes up some quite steep slopes, but it used to climb things that were more or less vertical if it could get grip. Now if baulked by a steep slope it "groans" and shudders and stops. It does not roll back. If I do a lot of work and get it good and hot the problem worsens.
I need to find out how to diagnose this. It should be noted that I live in the south of Spain where there are NO service facilities. so I do all my own work and I'll be fixing this too. Thing is I don't want to split the machine to reach the pump ifI don't need to.
I have a new cartridge filter on order (been to poor to buy one up to now) and I have been wondering if a blocked filter could be causing the pressure in the HST to get so high that it is opening the release valves and reducing the power. We will see. My German mechanic friend favours release valve trouble.
So any ideas ? Any one familiar with the procedure for getting at the relevant areas ? Can the charge pump be reached without splitting the machine ? How about the release valves. I have had to replace the loader/lift pump's release valve so they DO wear ?Any help and advice would be great, but as I said It is almost certainly my fault that I have a problem at all. It should be noted that the problem is not getting worse. The machine went from good to bad over night and has not worsened since. The PTO still gives full power , but then then I think that it has a shaft that passes the HST/Pump combo. I have the parts PDF but I would LOVE the workshop manuel.
Go well all. Raz
It is not a new machine but has given many years service.
I suspect my problem is self inflicted through stupidity.
At a job I caught a hydraulic line and lost a lot of fluid. I HAD to get the machine home because I HAD to do anther job the next morning so I topped up with some used engine oil from my Jeep. I keep the Jeep oil very clean so it was only six months old and a bit sooty. Yep Dumb but it got me home where I drained all the oil, fixed the leak, topped up with new oil and forgot the whole thing. Some weeks later the machine was very reluctant to move one morning. It had been fine the day before, but now it acted like it had no trans fluid in it.
When I checked there was oil . BUT I remembered the dirty stuff I had put in , so I checked the cartridge filter and sure enough it was black inside so I washed it with petrol and put it back and things were better but not best.
I spoke to KUBOTA who said that a bit of dirt in the filter would not affect anything as it was on a return line, and that as I had an old machine the charge pump was probably worn. (By carbon in the oil?) This sounded OK apart from the fact that the machine went wrong over night. Literally. Now some months later it is still the same. It goes, it moves, but high ratio is a no no except on level ground, and in low the machine won't climb well. It goes up some quite steep slopes, but it used to climb things that were more or less vertical if it could get grip. Now if baulked by a steep slope it "groans" and shudders and stops. It does not roll back. If I do a lot of work and get it good and hot the problem worsens.
I need to find out how to diagnose this. It should be noted that I live in the south of Spain where there are NO service facilities. so I do all my own work and I'll be fixing this too. Thing is I don't want to split the machine to reach the pump ifI don't need to.
I have a new cartridge filter on order (been to poor to buy one up to now) and I have been wondering if a blocked filter could be causing the pressure in the HST to get so high that it is opening the release valves and reducing the power. We will see. My German mechanic friend favours release valve trouble.
So any ideas ? Any one familiar with the procedure for getting at the relevant areas ? Can the charge pump be reached without splitting the machine ? How about the release valves. I have had to replace the loader/lift pump's release valve so they DO wear ?Any help and advice would be great, but as I said It is almost certainly my fault that I have a problem at all. It should be noted that the problem is not getting worse. The machine went from good to bad over night and has not worsened since. The PTO still gives full power , but then then I think that it has a shaft that passes the HST/Pump combo. I have the parts PDF but I would LOVE the workshop manuel.
Go well all. Raz
Good Luck!
