Hi range HST bogging on grade - CK30 (CT230 actually)

   / Hi range HST bogging on grade - CK30 (CT230 actually) #11  
John, my driveway gains 200 feet over 1/3 of a mile. I always climb and go back down in 4wd(you need that 4 wheel engine braking going downhill, especially with a load/trailer) and medium gear. My rears are loaded and most of the time I have a box on it and in 2wd it will climb, but they do spin a bit. I run at max rpm(DK40 is just under 2500). I also remember on my CK30, putting the rpm on the small red hash mark on the gauge(HST loves max rpm). High range ain't gonna cut it on a 10% grade with any HST that I have driven.
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #12  
Everybody. All of these hydro tractors require Engine RPM's for the hydrostatics to maintain speed.

Try this. Instead of holding the HST Pedal to the mat as you are doing; as you sense/feel/hear or better yet see the Engine RPM's dropping, easily lift pressure (your foot) off HST pedal and you will see the Engine RPM increase, tractor speed will not decrease as fast. You are putting the engine back into it's power band. This works from your Sears lawn mower to your zero turn mower to even a DK50SE 50hp tractor. Yes, you can hydraulically bog down even 50 hp with to much load.

And for you gear tractor owners, you are correct, you drop a gear to get the RPM's back up. Pulls better too..

Tony

Tony
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #13  
CK 27 HST, H is for down hill or flat terrain, for all HST with H / M / L range, not so sure about some of the larger horse powered DK's but CK series for sure. But I am in a hilly rocky area and in 4 x4 and low or Med range all the time.
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #14  
Normal....I have a CT230. HI range is for level road travel only. You don't start your truck and trailer towing in 5th gear.

If you want to go fast...don't use a tractor!
 
   / Hi range HST bogging on grade - CK30 (CT230 actually)
  • Thread Starter
#15  
I see several of you have commented that you leave 4x4 mode on all the time. This surprises me especially since I can feel the drivetrain binding when turning sharply. As with cars/trucks in 4x4 mode, it seems to me that 4x4 mode in the tractor should only be used when needed.

Am I incorrect in this understanding? Is the 4x4 mode on our tractors more like what's in my Subaru (AWD) that can be used 100% of the time with no ill effect?
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #16  
You're right. It's 4WD and not AWD. Use the 4x4 only when you need the traction. If on hard ground, it will bind especially when turning sharp because the front and rear tires are travelling over the ground at a different rate. If the 4WD shifter seems a little stiff, lube the linkage and especially where the rod shaft enters the trans case. I use white spray lithium.

Try what Tony, from LaVoie Equip, advised. If the hill is very steep, rpms should be 2500-2600 and ease up on the pedel some. If it still won't go, then you'll have to use medium range. When I have my KB2375 bh on, about 700lbs, I can tell that it's there. The guys from Michigan Iron & Equip had advised before that the hst likes 2000rpm to work properly. If you were just putting around slowly on the level, you could be around 1500rpm but if you want the tractor to do some work, it's 2000 and up.
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #17  
Everybody. All of these hydro tractors require Engine RPM's for the hydrostatics to maintain speed.

Try this. Instead of holding the HST Pedal to the mat as you are doing; as you sense/feel/hear or better yet see the Engine RPM's dropping, easily lift pressure (your foot) off HST pedal and you will see the Engine RPM increase, tractor speed will not decrease as fast. You are putting the engine back into it's power band. This works from your Sears lawn mower to your zero turn mower to even a DK50SE 50hp tractor. Yes, you can hydraulically bog down even 50 hp with to much load.

And for you gear tractor owners, you are correct, you drop a gear to get the RPM's back up. Pulls better too..

Tony

Tony

My recent experience that concerns me a little is that the (paved) road was at a very slight incline, although an incline that continued a long way, and that even at full throttle and easing off the pedal, I never managed to get moving any faster than I could have gone in mid range. As soon as I give it more petal, it would start to bog and there would be no increase in speed, this was done very gradually. I tried to keep the rpm's at the 2500 level marker by increasing or decreasing the amount of pedal.
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #18  
I didn't address easing off the pedal on a 10% grade since if still in high gear it won't make a bit of difference. I will say that in Mid range I even set cruise control all the way up to the house...no feathering required.

I do need to do an actual calculation of my grade....I bet it is around 20% or better in places.
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #19  
kiotiken said:
My recent experience that concerns me a little is that the (paved) road was at a very slight incline, although an incline that continued a long way, and that even at full throttle and easing off the pedal, I never managed to get moving any faster than I could have gone in mid range. As soon as I give it more petal, it would start to bog and there would be no increase in speed, this was done very gradually. I tried to keep the rpm's at the 2500 level marker by increasing or decreasing the amount of pedal.

I am doing this from my phone - what hp do you have? What is your tractor optioned with?

Remember, A lot of things come into play.

Tony
 
   / Hi range HST bogging on grade - CK30 (CT230 actually) #20  
My recent experience that concerns me a little is that the (paved) road was at a very slight incline, although an incline that continued a long way, and that even at full throttle and easing off the pedal, I never managed to get moving any faster than I could have gone in mid range. As soon as I give it more petal, it would start to bog and there would be no increase in speed, this was done very gradually. I tried to keep the rpm's at the 2500 level marker by increasing or decreasing the amount of pedal.

From your above mention that it is a CK30hst with 1200lb bh, loaded tires. and cab with total weight at @6500lbs, that's a load for those 30 ponies. Hopefully Tony can give you an idea of what it may be being that you said it used to do better.
 

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