Hi,
I am looking for some direction / wisdom from you good people.
I have read alot of the threads here and in other sites and have tried many of the suggested remedies. I have just acquired a RTV900G at auction with 2700 hours. I didn't have the chance to drive it much after getting it and wanted to change oils etcetera. It appeared to come from someone who looked after it. All nuts and bolts had rotation indictor marks although the dates on the filters were a few years old.
When taking it for a test drive after doing the servicing etcetera I have trouble getting any speed out of it. The speed on flat concrete / pavement in low gear is apporximately 8 mph, Medium is around 9 mph and in high it is 10 -11 mph. Reverse is actually the fastest at around 12 mph. These readings are from the speedometer however they feel about correct. I am fairly confident that the speed was an issue before I did the servicing I just didn't drive it far enough or watch the speedometer to be 100% sure.
On jack stands the speed does build up to 25 mph, even 30 mph in high, however this takes a minute or so and builds very slowly.
In relation to the transmission:
I have changed all of the oils and filters using Genuine filters and UDT oil.
I have changed the 3 valve plates and they did have some wear. The pumps and swash plates looked ok visually.
I did release the coast valve 1 1/2 turns as it originally gave you whiplash when you took your foot off the accelerator.
The throttle and transmission linkages all look tight / firm.
I have checked for brake / wheel drag and it does roll slowly down a slight slope when in neutral. When you do try an rotate the rear wheels on jack stands there is some resistance and if you push the RTV when on the ground there is some as well. I am thinking this is just the transmission being engaged even though it is neutral. (as I mentioned it rolls down a slight slope slowly in neurtal).
I have done some other things that I assume wont effect the speed:
New front axles
New injectors
A couple of new switches (oil pressure and neutral sensor)
New alternator and starter
Checked the spark arrester was clear
The machine "could" have come from an airport and it has been suggested that a speed limitor may have been fitted or some other way of restricting the speed. I can't see any add-on device and would not know where you would restrict it to the same (ish) speed in all gears on a hydrostatic transmission.
Sorry for the long read, I have spent hours reading threads, looking at Messicks diagrams, looking through the WSM and tinkering. To me this sounds like oil flow or pressure which is why I swapped out the valve plates however this had little effect (actually it may have made things slightly worse but that might just be my disappointment that it didn't work).
Any thoughts, advice or recommendations would be appreciated. I would like to say I'm a bit handy, just dont know if I could or want to do a rebuild of the transmission.
Thank you in advance, I'm off to have a beer or two and stare stupidly at the back end of an RTV again.
I am looking for some direction / wisdom from you good people.
I have read alot of the threads here and in other sites and have tried many of the suggested remedies. I have just acquired a RTV900G at auction with 2700 hours. I didn't have the chance to drive it much after getting it and wanted to change oils etcetera. It appeared to come from someone who looked after it. All nuts and bolts had rotation indictor marks although the dates on the filters were a few years old.
When taking it for a test drive after doing the servicing etcetera I have trouble getting any speed out of it. The speed on flat concrete / pavement in low gear is apporximately 8 mph, Medium is around 9 mph and in high it is 10 -11 mph. Reverse is actually the fastest at around 12 mph. These readings are from the speedometer however they feel about correct. I am fairly confident that the speed was an issue before I did the servicing I just didn't drive it far enough or watch the speedometer to be 100% sure.
On jack stands the speed does build up to 25 mph, even 30 mph in high, however this takes a minute or so and builds very slowly.
In relation to the transmission:
I have changed all of the oils and filters using Genuine filters and UDT oil.
I have changed the 3 valve plates and they did have some wear. The pumps and swash plates looked ok visually.
I did release the coast valve 1 1/2 turns as it originally gave you whiplash when you took your foot off the accelerator.
The throttle and transmission linkages all look tight / firm.
I have checked for brake / wheel drag and it does roll slowly down a slight slope when in neutral. When you do try an rotate the rear wheels on jack stands there is some resistance and if you push the RTV when on the ground there is some as well. I am thinking this is just the transmission being engaged even though it is neutral. (as I mentioned it rolls down a slight slope slowly in neurtal).
I have done some other things that I assume wont effect the speed:
New front axles
New injectors
A couple of new switches (oil pressure and neutral sensor)
New alternator and starter
Checked the spark arrester was clear
The machine "could" have come from an airport and it has been suggested that a speed limitor may have been fitted or some other way of restricting the speed. I can't see any add-on device and would not know where you would restrict it to the same (ish) speed in all gears on a hydrostatic transmission.
Sorry for the long read, I have spent hours reading threads, looking at Messicks diagrams, looking through the WSM and tinkering. To me this sounds like oil flow or pressure which is why I swapped out the valve plates however this had little effect (actually it may have made things slightly worse but that might just be my disappointment that it didn't work).
Any thoughts, advice or recommendations would be appreciated. I would like to say I'm a bit handy, just dont know if I could or want to do a rebuild of the transmission.
Thank you in advance, I'm off to have a beer or two and stare stupidly at the back end of an RTV again.