Driving a HST

[ovrszd]

Does that constant high rpm get to you after a while. That's the part I don't think I'll appreciate.

For me,,,, yes.....

The only time I use the hand throttle on my M9540 Shuttle is to do PTO tasks. The rest of the time it's at an idle. You can't do that with HST. Don't even try it, you'll be greatly disappointed. And it doesn't matter what HP tractor you are running. It's just like a stick shift pickup versus an auto pickup. It is essential that you turn rpms with HST to get any production. Without rpms it will stall.

I'm hoping you can adjust and enjoy the HST. Just be patient and give it time. As I said earlier, you're first thoughts are going to be that it's underpowered. Rev it up and most of that goes away, not all, but most.

Edit: meant to add, on my HST JD mowing tractor, I never run it at idle. Always have 1/3 throttle or more.

 

[k0ua]

Does that constant high rpm get to you after a while. That's the part I don't think I'll appreciate.

I vary the RPM quite a bit, I will back off of the RPM a bit. when it is not really needed. The new Kioti's do have a throttle linked pedal. The Kubota Grand L's have had it for a long time. I would imaging other deluxe tractors across brands also have it.

 

[phiferpharm]

The only thing many DK owners find is that the hand throttle can be very tight when you get it. I might add that it doesn't seem to loosen up much with time and use, so be prepared to loosen it up if it is too tight. I haven't loosened it up or lubed it, but I should. There are several threads about the best way to do this (unless I'm mistaken I think James has posted about this).

 

[s219]

I would caution against loosening hand throttles -- they are meant to be tight by design (usually have stacks of disc springs between plates) to have enough friction. Otherwise, the vibrations of the diesel would cause the throttle to move on its own. In fact there are occasionally threads here from guys who need to tighten the throttle to keep it from drifting. So I'd try carefully lubing it first, but avoid messing with the springs or plates.

Re: the main topic, I find that the operating procedure for HSTs is very consistent with how diesels are used, especially if you think of the HST pump as a separate piece of working machinery (it is, it's a pump basically). I grew up using all sorts of diesel equipment and the first thing you'd do is throttle it up to an operating RPM before engaging whatever machinery there was. Machinery attached to trucks or other drivable construction equipment even had separate hand throttles (often on the opposite end of the machine from the driving station) just for that purpose. Diesels are very efficient when you put the RPM in the meat of its range and leave it there while doing work.

Chuck, you seem like you're between a rock and a hard place with the CK to DK trade, but maybe you should test drive an HST DK before committing. Or look at some other models/brands available with the HST+ types of transmissions that link throttle to the HST pedal(s). To me that may be the best of both worlds.

 

[chuck172]

I vary the RPM quite a bit, I will back off of the RPM a bit. when it is not really needed. The new Kioti's do have a throttle linked pedal. The Kubota Grand L's have had it for a long time. I would imaging other deluxe tractors across brands also have it.

What's a throttle linked pedal? This is starting to get complicated.

 

[k0ua]

Many DK owners (including this one) have had to lube up or loosen up that hand throttle.. It is too tight. Here is how.

http://www.tractorbynet.com/forums/...ottle-lubrication-pix.html?highlight=throttle

By the way if you missed it, here is how slow you can go with a Hydro transmission. Inch worms can overtake you!

http://www.tractorbynet.com/forums/...4-how-slow-can-you-go.html?highlight=throttle

 

[k0ua]

What's a throttle linked pedal? This is starting to get complicated.

Instead of what I told you in a previous post about setting the hand throttle at 1800 or 2000 or above depending on the job, you can "link" the throttle to the pedal that controls the swash plate in the hydro. So you can leave the hand throttle at some lower setting and then when you step on the go pedal, it will also up the throttle. So as you start to need torque from the engine it will automatically throttle up as you start to load it, and it will also throttle down as you let off of the pedal. Kubota Hydrostat plus has had this feature (and many more) for some time. Kioti now has it as well in the new NX series. The DK series does not have this feature.

 

[the old grind]

IMO what James and nybirdman said on page 2 could (should?) be laminated into a quick start guide for those new to HSTs. :thumbsup:

C172, expect more back-pats for choosing such a nice machine. I wouldn't sweat the expected noise (and thirst) of high rpm running. PTO implements may soon drown that out with their own racket. Field and brush mowers want full (540) PTO rpms, but tillers, PHDs, and many others can be scary at such speeds. (I'd bet you're rpm will be in the high teens 90% of the time too.) Congrats!

 

[oldpilgrim]

put the throttle wherever it 'feels' right for you. I very seldom put mine over 15-1800. I had pushed it up to 2000 when driving down the road. You'll find you will very infrequently use the throttle.

Don't over think the hst stuff. It simple, versatile, works, works easily, and works very well.

 

[TJP89]

I find that once I get the engine up over 2000 it smooths out and isn't too loud. Running at PTO speed (2400-2500 I think) with the cutter gets LOUD however, but that's true on any tractor.

The only time I run in idle is when I'm just moving around behind the barn from implement to implement over very short distances. Everything works at idle, just very slowly, and a lot of doing that can't be good for the tractor.

I found the HST very intuitive to use, much more so than a gear tractor. If you play around with it a little, you'll get the hang of it quick.

 

[ovrszd]

I find that once I get the engine up over 2000 it smooths out and isn't too loud. Running at PTO speed (2400-2500 I think) with the cutter gets LOUD however, but that's true on any tractor.

The only time I run in idle is when I'm just moving around behind the barn from implement to implement over very short distances. Everything works at idle, just very slowly, and a lot of doing that can't be good for the tractor.

I found the HST very intuitive to use, much more so than a gear tractor. If you play around with it a little, you'll get the hang of it quick.

My little JD2210 is a 3 cyl diesel. It's very rough at an idle. Rev it to 1500rpms and it smooths out. That's usually where I run it. And it performs miscellaneous tasks much better being HST.

 

[akroeze]

So I'm new to my CK30 but I seem to get the MOST power to my FEL when it is running at PTO speeds. If I run at 1800 I just can't get the same kind of go out of it as at PTO. Not sure if this is more perception or reality...

 

[jix]

Hello AKROEZE. Welcome to TBN. I used to live in Napanee. Lovely city, lovely waterfall, lovely people. I miss the place. My dad used to own the bakery on Dundas St.

Jix:drink:

 

[MinnesotaEric]

Linked throttle, which is available on all the eHST machines from Deere, Kubota, Massey, Kioti and I'm sure more as more tractor OEMs update their CUT line-up, allows the pedals to control engine speed just like driving an automatic car. It is child's play and makes the tractor super easy to operate.

At the 2:00 mark you will see a demonstration of a linked throttle with an eHST on Massey's MF1700 series

 

[Katahdin]

Yanmar LX HSTs have a foot throttle that is toggled on with a switch. Its called syncro throttle. When that switch is off you set the rpm with the hand throttle.

It can also be used in conjunction with high rpm pto work. For instance when tilling or bush hogging, set the rpms for PTO work with the hand throttle. Need to stop the PTO and move the tractor? Drop down the rpms to idle with the hand throttle, turn off the PTO, and drive off using just the foot throttle.

When you've reached your destination, stop, engine rpms return to idle. Flick on the PTO, then increase rpms with the hand throttle for PTO work.

 

[TJP89]

So I'm new to my CK30 but I seem to get the MOST power to my FEL when it is running at PTO speeds. If I run at 1800 I just can't get the same kind of go out of it as at PTO. Not sure if this is more perception or reality...

Past a certain point the loader maxes out, I think that is well below PTO speed. What you may notice is the added power the tractor has to push into something.

 

[tman1020]

Well when I test the loader relief pressure on my loader there is a difference in pressure at different rps. Pressure is set at full throttle on my machine. So I would think max lift would be at max rpm but maybe it doesn't work that way.

 

[CJONE]

So I'm new to my CK30 but I seem to get the MOST power to my FEL when it is running at PTO speeds. If I run at 1800 I just can't get the same kind of go out of it as at PTO. Not sure if this is more perception or reality...

A simple hydraulic relief [spring ,ball, seat] works this way. At 3 gpm, say idle on a small tractor, it will relief at full flow at 2500psi. Now increase to full throttle say 10gpm it has to squeeze 3x the flow through the same ports and it has to push the spring and ball open farther and that takes more pressure. Say 2650psi. So I hope that makes more sense why it lifts more at more RPM's. CJ

 

[oldtimer 66]

I have an older JD 4320 Cab model with hydrostatic drive. It also has load match and no syncro throttle. The load match is an option at that time on my tractor a 2006 model. You cannot stall out the tractor with that option switched on. It will back off the ground speed so that the engine maintains a minimum torque output. I can set my throttle to what ever rpm I need and work from there knowing that I cannot stall out the tractor. My dealer said that this option and how it works is the same as and or very similar that the large loaders use that have hydrostatic drive. Just an FYI to this thread. Later.

 

[ovrszd]

My Brother's L3240 had something similar. Kubota calls it Anti-Stall.

No offense intended here. GOD I HATED THAT!!!! Absolutely took ground speed control away from the operator. Engage Anti-Stall and Auto Throttle and a monkey can make the machine move with no worries about stalling or whatever. But then, all the operator was along for was the ride and has very little control as to what is going on. Again, no offense intended, that's why I didn't "Reply with Quote".