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Old 09-12-2018, 09:13 PM
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zenchal26 zenchal26 is offline
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Default hst hesitating

No one has an ideas why the hst is hesitating on my 2016 x1100c??? like i said push the pedal down (doesnt matter if its a 1/4" or all the way down) it takes a second for the trans to move the wheels? Is there a relief valve that controls this?? Charge pressure??? Any pics where this is located??? this is not normal operation my 04 did not have this issue and neither do the new ones at the dealer. Any help would be great
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Old 09-13-2018, 07:37 AM
aurthuritis aurthuritis is offline
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when you push the peddle and the hst speed lever moves it allows oil under pressure to activate the servo piston. the servo piston is what actually moves the swash plate not the speed lever. so yes you may have a charge or high pressure problem or an internal leak. do you have a shop manual?
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Old 09-13-2018, 04:32 PM
hondajoe hondajoe is offline
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Default hydro problems

I should of posted a reply you should ck your pressure relief valve to make sure it is not stuck or adjusted wrong it should come all the way out.Now if you have a hand throttle crank it up about half way up then pull it in gear it should have power instantly that would mean you don't have the pressure at idle.JOE
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Old 09-13-2018, 06:25 PM
Lee1935 Lee1935 is offline
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Kubota changed X900 transmission pressure specs the spring of 2017, good chance they did the same for all of their side by sides
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Old 09-14-2018, 06:40 AM
aurthuritis aurthuritis is offline
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Quote:
Originally Posted by Lee1935 View Post
Kubota changed X900 transmission pressure specs the spring of 2017, good chance they did the same for all of their side by sides
did they raise the pressure or lower it?
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Old 09-14-2018, 08:29 PM
Lee1935 Lee1935 is offline
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Quote:
Originally Posted by aurthuritis View Post
did they raise the pressure or lower it?
Raised, don't remember how much but it was quite a lot, have to stop at the dealer in the next week or so and ask. A kubota rep spent two days with them but then they are a rather large equipment dealer
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Old 09-15-2018, 07:45 AM
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Yes I have the manual. We’re all the pressures raised (charge and high pressure)
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Old 09-15-2018, 07:48 AM
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So in theory if I can climb steep hills and get 24-26 mph the high pressure valve should be ok and I should be looking at the charge valve correct?
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Old 09-15-2018, 07:57 AM
aurthuritis aurthuritis is offline
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Quote:
Originally Posted by zenchal26 View Post
So in theory if I can climb steep hills and get 24-26 mph the high pressure valve should be ok and I should be looking at the charge valve correct?
probably not. your problem is probably involved in the control valves that send oil to the servo piston befor it can move the swash plate. if your charge pressure was weak i don't think you would have power. it could be your charge pump though.
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Old 09-15-2018, 11:21 AM
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There are two hydraulic pumps and circuts in the RTV-X HST. One is the swash plate pump which pumps the fluid which drives the swash plate motor which drives the wheels. The other is a gear pump which provides pressure to control the swash plate of the swash plate pump. Which one does "charge pressure" refer to?
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Old 09-15-2018, 11:49 AM
aurthuritis aurthuritis is offline
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there is a gear pump that puts up aprox 100 psi "i think". this charge pressure is what fills the high pressure pumps and operates some but not all of the controls servos etc. there is also a high pressure bleed of circuit that is used to buffer the servo solenoid and some other things. if you have the book it is all in there. if the charge pressure is low there can be cavitation occur in the high pressure positive displacement pump and motor. think about what i just said "positive displacement" once the oil is pumped it is exchanged directly to the corresponding "positive displacement" motor. there is no room for error or something gets bent. the high pressure relief valve is the safety to prevent failure. a misconception is if you turn up the pressure you will make it go faster.
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Old 09-15-2018, 03:34 PM
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I'm away from my WSM for a few days. I'll have a look at the hydraulic flow diagrams when I get back. I remember that the gear pump supplies fluid for the swash pump control circuit.
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