2555 throttle response

[Jabonee]

Got a question for you out there for those who have a 2555 tractor. I noticed on the one I have seems to be a bit sluggish on the throttle response. Told this was the nature of the beast since it is flyby-wire. Anyone out there notice this?:confused3:

 

[Uncle Hulka]

Noticed the same thing on mine. I assume it's directly related to Tier IV emissions, as well as being throttle-by-wire. A dealer apprised me of this behavior early on. I haven't found it to be an issue.

One behavior I didn't expect, was that when I have engaged the rear PTO, it is not possible to exceed the pto-rated engine rpm, regardless of throttle position. And I'm not talking about implements that require high horsepower either. It does this even with my 3-pt leaf blower!

 

[Jabonee]

Noticed the same thing on mine.

Thanks for the confirmation.Is your tractor HST? If so is the engine real sluggish and weak in high range?:confused3:

 

[akax50]

Thanks for the confirmation.Is your tractor HST? If so is the engine real sluggish and weak in high range?:confused3:

Hey Jabonee, I have the 2555 hst and I have never noticed any sluggishness with throttle or high gear. We traded a very new John Deere for our Mahindra and the JD had both of those problems. Found out that part of the problem with the JD was a throttle postion sensor that was replaced just before we traded it.

 

[Uncle Hulka]

Don't know if this is normal, but I just discovered that even without the PTO engaged, I am unable to get the engine RPMs above 2,400 (pto speed). Yesterday I mounted a 3-point hydraulic reservoir/pump (30 gal if memory serves) to power my FEL-mount Erskine snow blower. I believe this requires about 45-50 hp. I did a test run and at first (with cold hydro oil), I couldn't get engine rpm above 1,800. WTF?! This was the first time the engine had been put under any real load. I let it run awhile. With the oil good and warm, I could now reach about 2,150-2,200 rpm. I know the pto on a 3555 HST is rated at 42.5 hp, but shouldn't I be able to reach at rated pto speed with the blower doing nothing but, well, blowing?

 

[Jabonee]

Hey Jabonee, I have the 2555 hst and I have never noticed any sluggishness with throttle or high gear. We traded a very new John Deere for our Mahindra and the JD had both of those problems. Found out that part of the problem with the JD was a throttle postion sensor that was replaced just before we traded it.

AKAX50 Is you tractor equipped with"Load Sense"? I notice on the tractor I have here if the load sense is not on the tractor won't get out of its own way in high range.:confused3:

 

[Jabonee]

I'm wondering if the PTO has a load sense like the HST tractors do. Only delivers RPM when Load is applyed. Does seem strange you could not reach 2,400.:confused3:

 

[Uncle Hulka]

I do have a push-button switch identified as "LOAD SENSING", but I didn't turn it on. I had forgotten all about that little bugger. Hmmnnnnnn......I wonder if that could be part of the problem.

I won't be able to test until the weekend, but I'll report my findings here asap.

Can anyone here explain, in real-world terminology, what exactly "Load Sensing" is and how it would limit my engine speed when it's not engaged?

 

[oldpilgrim]

I'm wondering if the load sensing thing is like the smaller lawmmowers that used to have a spring on the carb that would speed up the engine if the engine sensed a load. Some people called it a governor. There was a paddle that used the flywheel generated wind and would move and pull on the spring.


It didn't control max rpms, as in a limiter like most governors do, but gave you more power when you started to get bogged down.

 

[Uncle Hulka]

I'm just hoping I'm making the rated 42.5 hp at the pto. This was one of the main reasons for buying this tractor in the first place. Realistically, I won't know for sure until the first snow storm. And no matter how impatient I am to know the answer, I am NOT going to be the one responsible for wishing the first snowfall of the season into existence!:snowflake: