CK30 RPM Normal Drop Under Road Load

[Spanky100]

I have a CK30 HST FEL R4s(not loaded) Box Blade (600 lbs). This is the first time that I have used the HST High range for driving on paved roads. Each time I would set engine RPM to PTO rated notch on tachometer which is 2500 Engine RPM before starting out.

When running full forward speed (HST foot pedal down all the way) on level road the Engine would drop 100 to 2400. Some of the short up grades the RPM would drop a total of 200 to 2300 Engine RPM. Does this seem normal? I was thinking the engine governer might maintain the engine RPM closer to unloaded set engine speed.

When do you get to the point that you should select the next lower HST Range for road transport?

From memory when running a 5 foot rotary cutter in low range over 4 to 5 foot grass type weeds about a 100 engine RPM drop is my experience.

Trying to learn and not abuse the tractor.


Thanks

Wayne

 

[Mousefield]

I have had my CK35 HST R4 tires on a paved road a couple of times, went down about 1,000 feet to box blade around the government mail boxes. Mine will drop a bit of RPM as well. Only had it in high a few times, find the tractor is too bouncy using it to travel around my property in high.

 

[LastSTRAW]

High Range tends to do that on my DK50 as well when going up hill. I am still getting used to the HST but I find that in high range it does bog down from time to time especially with the PTO engaged. I don't have a solution I just live with it.

 

[Dmace]

I was thinking the engine governer might maintain the engine RPM closer to unloaded set engine speed.

There is no governor, you set the engine speed with the hand throttle. I think the drop in engine speed is normal. You don't want to lug the engine too much so keep it above 2000 rpms while operating the HST and it will be fine.

 

[MtnViewRanch]

I have a CK30 HST FEL R4s(not loaded) Box Blade (600 lbs). This is the first time that I have used the HST High range for driving on paved roads. Each time I would set engine RPM to PTO rated notch on tachometer which is 2500 Engine RPM before starting out.

When running full forward speed (HST foot pedal down all the way) on level road the Engine would drop 100 to 2400. Some of the short up grades the RPM would drop a total of 200 to 2300 Engine RPM. Does this seem normal? I was thinking the engine governer might maintain the engine RPM closer to unloaded set engine speed.

When do you get to the point that you should select the next lower HST Range for road transport?

From memory when running a 5 foot rotary cutter in low range over 4 to 5 foot grass type weeds about a 100 engine RPM drop is my experience.

Trying to learn and not abuse the tractor.


Thanks

Wayne

This is most likely a common occurrence with the CK27 & CK30. I would think that the CK35 does not do this. This is part of why there is different HP ranges in the same frame size. Just think how bad this is with a CK27. I would think that if the RPM drops 350-400 RPM that it would be time to shift down.

Just my :2cents:

 

[Alien]

Correct. They are gutless in high gear and it is only a road transport gear more than anything. Mine loses a lot of rpm on a hill or even a slight rise. If it struggles too much just ease your foot off the fwd pedal a bit and allow it to come back to the next ratio until you are past the rise. Personally, I never use mine above 2000 rpm and usually about 1800 and it works fine.

 

[Dmace]

Personally, I never use mine above 2000 rpm and usually about 1800 and it works fine.

If you have an HST then you could be causing harm to the HST pump by operating it at less than 2000 rpms. The manuals as well as dealers and mechanics on this forum all say 2000 rpms is the lowest engine speed for operating the HST.

 

[VictorW]

The rpm drop in high range you mentioned is what mine does also. 30hp, over 3500lbs in weight and a high gear to get some travel speed puts some load on the engine. As Dmace mentioned, no governor to compensate for load.

 

[MtnViewRanch]

If you have an HST then you could be causing harm to the HST pump by operating it at less than 2000 rpms. The manuals as well as dealers and mechanics on this forum all say 2000 rpms is the lowest engine speed for operating the HST.

Is the 2000 RPM what the operator's manual says? With my Mahindra 3215 HST, the manual says to not operate under 1500 RPM. I know, different manufacturer, but I was just wondering.

 

[Mousefield]

If you have an HST then you could be causing harm to the HST pump by operating it at less than 2000 rpms. The manuals as well as dealers and mechanics on this forum all say 2000 rpms is the lowest engine speed for operating the HST.

I find 2,200 to 2,400 RPM is were I operate my CK35 HST.
When using my backhoe I am usually around 1800 RPM.

 

[Mousefield]

Correct. They are gutless in high gear and it is only a road transport gear more than anything. Mine loses a lot of rpm on a hill or even a slight rise. If it struggles too much just ease your foot off the fwd pedal a bit and allow it to come back to the next ratio until you are past the rise. Personally, I never use mine above 2000 rpm and usually about 1800 and it works fine.

As mentioned in my earlier post I find if trying to travel in high gear on anything other than a paved road the tractor bounces way to much. So I am almost always in middle gear.

 

[MotorSeven]

Spank, that drop sounds normal to me & is about what mine does. Remember to ease up on the pedal when you start to climb a hill. Big hills will require a range shift to MED.
Alien I never go down the road without first putting the throttle on the red triangle....about 2600 rpm. Also, I always work my DK40 in the 2300-2400 range when using any pto powered implement or when dragging the box. I find that the tractor just likes that higher rpm range to do that kind of work and anything lower just feels sluggish to me.

 

[milkman636]

Correct. They are gutless in high gear and it is only a road transport gear more than anything. Mine loses a lot of rpm on a hill or even a slight rise. If it struggles too much just ease your foot off the fwd pedal a bit and allow it to come back to the next ratio until you are past the rise. Personally, I never use mine above 2000 rpm and usually about 1800 and it works fine.

If you run the engine speed up a little higher you will find that the HST performance improves.

 

[milkman636]

...............When running full forward speed (HST foot pedal down all the way) on level road the Engine would drop 100 to 2400. Some of the short up grades the RPM would drop a total of 200 to 2300 Engine RPM. Does this seem normal? I was thinking the engine governer might maintain the engine RPM closer to unloaded set engine speed.

When do you get to the point that you should select the next lower HST Range for road transport?.....................................

The throttle lever position determines the amount of injector pump stroke that is used in delivery of fuel to the injectors. The governor's primary function in life is to reduce that stroke as the engine starts to overspeed. As you add more load to the engine, it will need to burn more fuel in order to maintain rpms.

If it sounds like it is starting to labor just bump up the throttle. If you stop the tractor without throttling down, that's when the governor will kick in to reduce fuel delivery as the load drops off.

If you start to reach the point where there is no more throttle to add to keep you at 2500, then you are at the point where you need to reduce the load.

As long as your staying in the low 2's, as you have descibed, I wouldn't be concerned. But don't be afraid to add a little more fuel into the mix to keep it running up where you want it either. The loads are dynamic and it is normal for the operator to adjust to them.

 

[Spanky100]

Everyone Thanks for a great Discussion and help in answering my questions.

Sounds like I am not abusing the tractor as not lugging the engine. Do not expect to use it for road transport much but in this case had to move some cut wood a short distance. I will admit rolling the cut log 18 inch long sections into the FEL Bucket on the ground was much easier that lifting them into the pick-up bed. Some of the wood sections just barely fit into the bucket. Next time I lift them they will have been split into smaller pieces for firewood.

One good thing I was able to confirm is when going downhill on dry pavement just easing off on the HST pedal would slow the movement down and allow you to stop the tractor from full speed without using the brakes. Nice to know when the grades get steeper if you have good traction going down hill you can slow and stop well with the HST.

Thanks again for the help

Wayne

 

[MotorSeven]

One more tip...if it's steep and wet(pavement) or steep on dirt/gravel, and you had a heavy load(dirt/logs/rocks) ALWAYS have it in 4wd. You will then have engine braking on all 4 wheels instead of just the rear and much more anti sliding control.

~don't ask me how I know this~

 

[Spanky100]

One more tip...if it's steep and wet(pavement) or steep on dirt/gravel, and you had a heavy load(dirt/logs/rocks) ALWAYS have it in 4wd. You will then have engine braking on all 4 wheels instead of just the rear and much more anti sliding control.

~don't ask me how I know this~

MotorSeven

Thanks for the Tip. (I am sure you saw someone else and learned from them) I am now mature enough (sometimes) that I can learn from others.

I do remember as a kid watching those that had to hold the spark plug wire lead on the single cylinder engine while the older kid pulled the starter. I learned from watching even then. I am still wondering what happens when you pee on the electric fence.

Thanks again I am still learning.

Spanky

 

[lockhaven]

MotorSeven

Thanks for the Tip. (I am sure you saw someone else and learned from them) I am now mature enough (sometimes) that I can learn from others.

I do remember as a kid watching those that had to hold the spark plug wire lead on the single cylinder engine while the older kid pulled the starter. I learned from watching even then. I am still wondering what happens when you pee on the electric fence.

Thanks again I am still learning.

Spanky

do not worry about peeing on an electric fence, pee does not conduct electricity go ahead TRY IT