NX4510 HST Power

[tmanmi]

Has anyone pulled a moldboard plow with a NX HST series. I have a NX4510 HST and I have not been impressed with the HST power. I expect a little power loss in High range but it seems to have trouble pulling its self down the road in high with out pulling anything. A slight hill will cause rpm loss and you have to let up on the peddle with WOT. Medium is a little better but more rpm loss that I would expect. I am asking about the plow because I dragged some logs in low range and experience more rpm loss than I expected. I admit it was a good size load but would expect more wheel spin in low than rpm loss. I came from a gear drive kubota and debated with going with an HST. Not impressed so far. Otherwise I really like the tractor and the features.

 

[3gunr]

Dose not sound right to me. High gear will for sure bog down but not low range. i have pulled trees out with my 2538 mahindra and in low it will spin tires well before bogging down . might change hydro fluid and filters and see if that helps.

 

[jeff9366]

HST provides max power to wheels as load is taken up. Therefore, an excellent transition for moldboard plowing.

I expect a little power loss in High range but it seems to have trouble pulling its self down the road in high with out pulling anything. A slight hill will cause rpm loss and you have to let up on the peddle with WOT (?) . Medium is a little better but more rpm loss that I would expect.

HST is not a go-fast transmission. It is a low-speed, high torque transmission in every range.

VIDEO: how hst transmission works - YouTube



Have you checked the level of your hydraulic fluid?

 

[MinnesotaEric]

If your tractor hasn't had a chance to run hot, the DPF may be a little clogged. I ran my tractor that way for the first two months wondering why it was gutless.

 

[rademamj1]

In low gear, my HST tractor can still pull most anything. Check your HST fluid level or change fluid and filters. Also check to see if you did not leave your brake on. In low gear, you can still move with a brake on, but experience limited pulling capabilities. I found this out the hard way, after several hours of trying to figure why my tractor lost its pulling power.

Hate to say it, but a tier4 tractor will automatically go into "limp mode", at about 50% power level, if your regens are not clearing out the DPF filter properly. Perhaps doing a high RPM manual regen to see if it helps with power improvement and hope it solves your problem.

 

[NC419N]

Been there done that gone to Gear I can稚 believe the difference! Don稚 get me wrong there are pros and cons to both. For my farm work it痴 Gear for me

 

[Kioti Dave]

I agree that high range is too tall. Wish it was geared down slightly. M range will bog when pulling a box blade up hill or even when blading. In L my NX4510 will spin tires and rarely bog unless pushing into a pile with bucket. You do need to learn to back off pedal when machine starts to lose rpm. That's why I sometimes wish I went with the NX 5010. Maybe a little less bog. Remember that this is a pretty big and heavy tractor for 45 hp!

 

[xcgreene]

If its helpful, here's information from my experience too.

DK45se HST. High is useless for all but road going, long distances, with light load. Medium is for getting around property, going to the location of work to be done, and a lot of medium duty, fasted paced, loader work. Medium will still bog down the HST if I'm trying to go up a very steep incline at full medium speed. But Low is a powerhouse. Snow blowing, rotary cutting, traversing very steep inclines with loads, pushing heavy things, burying you tractor to the case and having to call the neighbor so he can pull you out with his Komatsu PC200LC. It's best to be in low speed for high demand load anyway, your pedal is depressed further, meaning more oil volume through the cooler, as the swash plate of the HST axial piston pump if angled more. Low gear is a powerhouse, comparable to any 45hp geared tractor I have used in a lower gear.

Whether or not its advertised this way, an HST tractor is best used as a utility tractor, excellent for fast paced, forward reverse loader work, and general "some of this and some of that" utility. a comparable HST vs geared tractor, one cannot beat the ease of an HST for quick loader work. However, if you are doing 100s of acres of straight rotary cutting, lots of medium to slow paces row work, where you are going one speed, high load, for long distances for long periods of time, an ag tractor is best as a geared tractor, for now.

It's hard to say if what you are experiencing is normal without being in person.

 

[xcgreene]

If its helpful, here's information from my experience too.

DK45se HST. High is useless for all but road going, long distances, with light load. Medium is for getting around property, going to the location of work to be done, and a lot of medium duty, fasted paced, loader work. Medium will still bog down the HST if I'm trying to go up a very steep incline at full medium speed. But Low is a powerhouse. Snow blowing, rotary cutting, traversing very steep inclines with loads, pushing heavy things, burying you tractor to the case and having to call the neighbor so he can pull you out with his Komatsu PC200LC. It's best to be in low speed for high demand load anyway, your pedal is depressed further, meaning more oil volume through the cooler, as the swash plate of the HST axial piston pump if angled more. Comparable to any 45hp geared tractor I have used in a lower gear.

Whether or not its advertised this way, an HST tractor is best used as a utility tractor, excellent for fast paced, forward reverse loader work, and general "some of this and some of that" utility. a comparable HST vs geared tractor, one cannot beat the ease of an HST for quick loader work. However, if you are doing 100s of acres of straight rotary cutting, lots of medium to slow paces row work, where you are going one speed, high load, for long distances for long periods of time, an ag tractor is best as a geared tractor, for now.

It's hard to say if what you are experiencing is normal without being in person.

 

[NetbyTractor]

I also have a 4510, and in Low it always seems to spin in 4WD before running out of power. I run mine so that the RPM is around 2k, higher if I know I'm going to be working it hard. This is before the linked pedal activates. That way, the engine is not trying to "catch up" when you push the pedal down, it is already there. I also had my pedal recalibrated which made a big difference. It wasn't linear at all - the last 10% was double the input. Once recalibrated, it was nice and linear which made operation smoother.

 

[justman777]

My tractor will bury itself in low gear before it runs out of power. I have the occasion intermittently help out visitors to my neighbors house because they don't tell people to stay on the road. We're in the sticks, so you should be able to drive on the sandy loam we have, right? Anyway, I've tandem pulled a large delivery truck out. Used low gear and about 1500 rpm. Never ran out of power, and the wheels kept spinning. If we hadn't pulled him out, the tractor would have just kept on digging.

 

[tmanmi]

Fluid is full. The tractor only has 25 hrs on it. Will change the filter at 50 and see what happens. Sounds like it it operating normal and I will have to adjust.

 

[tkh159]

Same issue here and I discovered this issue going up hill on the road in high gear without the pedal fully pressed down as if I did the rpms drop and tractor wants to stall. On level land in high gear the tractor operates fine but the few short inclines on the property is a no go in high gear.

So from previous post this sounds normal? The tractor has done this from day one and and currently has 50 hours on it and fluids are fine.

Not looking to break any speed records but just want to make sure the transmission is functioning as it should.

 

[ptsg]

Same issue here and I discovered this issue going up hill on the road in high gear without the pedal fully pressed down as if I did the rpms drop and tractor wants to stall. On level land in high gear the tractor operates fine but the few short inclines on the property is a no go in high gear.

So from previous post this sounds normal? The tractor has done this from day one and and currently has 50 hours on it and fluids are fine.

Not looking to break any speed records but just want to make sure the transmission is functioning as it should.

You're just experiencing the problem of HST in general. They are good to maneuver around and do a lot of direction changes but not so good in pulling loads, road driving or any ground engagement tasks.

Even on the slightest hill, in High range the tractor will bog down. Same for Medium range on steeper hills, maybe just not so noticeable.

A geared tractor would just keep going or if you're pulling a trailer, you may need to drop a gear on the move but it still goes.

 

[tkh159]

Thanks for your reply! I'm not familiar with HST as it was rather new to me but we needed something for maneuvering a lot and going backward and forward often and the HST works great for that especially have a forward pedal and reverse pedal.

Compared to the geared DK40 we use to have it's a world of difference!

 

[tmanmi]

I think it is just the nature of the beast. Learning what you can and can't do in each range. Hydro not the best thing for a field tractor IMO. Pulling a 6' disk in low range get a little bogging at full speed. Was able to pull the same disk with my Kubota L2500 in 5th gear all day long not bogging. I do enjoy the hydro for loader work and moving things around.

 

[justman777]

Same here for the engine bogging down in high gear. However, high gear is meant for transport. If you're trying to do any work in high gear, you'll be frustrated quite a bit. My go to range is medium for most work mowing or general loader work, and low gear for ground engagement like a disc harrow or box blade. I've pulled a 7 foot disc harrow in low with no bogging....but that's in sandy soil.

 

[tkh159]

I think it is just the nature of the beast. Learning what you can and can't do in each range. Hydro not the best thing for a field tractor IMO. Pulling a 6' disk in low range get a little bogging at full speed. Was able to pull the same disk with my Kubota L2500 in 5th gear all day long not bogging. I do enjoy the hydro for loader work and moving things around.

Loader work is a breeze now for sure!

 

[tkh159]

Same here for the engine bogging down in high gear. However, high gear is meant for transport. If you're trying to do any work in high gear, you'll be frustrated quite a bit. My go to range is medium for most work mowing or general loader work, and low gear for ground engagement like a disc harrow or box blade. I've pulled a 7 foot disc harrow in low with no bogging....but that's in sandy soil.

That's good to know! I use medium range for most everything and have no issue there even with a 6ft tiller or the 7ft land leveler/grader.

 

[tkh159]

So while on the topic of loss of power in high range....does anyone have any issue with operating a backhoe with the NX4510 HST or HST in general? I did notice in the beginning the HST was less HP than geared but hasn't presented an big issue.

Operation of the KB2485 backhoe seems fine to me with HST. Any one have some input on operation of a backhoe with HST versus geared?