CT 235 PTO HP testing

[powerscol]

Does anyone know of any actual testing of the PTO HP for our tractors. Looking to check the specified 26.5 HP against actual testing.

Second question, is there a way to up the PTO hp by adjusting pressure, etc.

Thanks

 

[ttriff]

Sorry not aware of any independent testing sites for that spec.

No there are no adjustments that increase hp at the PTO.

 

[sd455dan]

Does anyone know of any actual testing of the PTO HP for our tractors. Looking to check the specified 26.5 HP against actual testing.

Second question, is there a way to up the PTO hp by adjusting pressure, etc.

Thanks

not specific to Bobcat- but some dealers reportedly have pto mountable dyno's to verify a tractors horsepower output.


Have seen another post where the owner thought the tractor was producing well over what it was rated- in one case the pto was outputting more than 10 hp more than what it was rated.- i am sure that owner was pleasantly surprised...

you can also check Tractor Data- and it sometimes has links to Nebraska tractor test labs here- http://ccs.infospace.com/ClickHandl...2&mid=9&hash=A23090F6D8BB63CE819D1DC91053C0B0
they do have the CT-450 listed but that is all...?
Hope this is helpful...

 

[powerscol]

Was working with the tiller in my signature today. I got it to dig as deep as it would go and then some. Its the first time it put a load on on my tractor, only dropped RPM's slightly below the 540 rpm mark on the tack, so I am impressed with the power I have. Its rated at 30 to 50 HP. No black smoke, so I will be chatting with my Bobcat Doc on any adjustment possible.

Please keep the comment and thoughts coming - Thanks

 

[SSdoxie]

The PTO drive is all mechanical from engine to the output shaft, there is no hydraulic pressure adjustment that could/would change it. Only way to increase it is more HP from the engine.

 

[powerscol]

Thanks Dennis. Its surprising the parasitic loss then, but it is probably rated with full power to the drive trans too, I.E. running condition. I did notice a big pick up in power if I backed off the speed. Was running in mid range. When I went to low range things were better. Even under load the tractor did not smoke though. Was wondering if it should have? Still very pleased with it.

 

[SSdoxie]

Why run in Mid-range tilling? Top speed in low is 4 mph and I don't think you can do any decent job tilling that fast. When working in slower speeds the lower range allows transfer of engine power to the drive system at less pressure = less HP required.

The top speed in low is 4 mph and top speed in Mid-range is 8 mph. Twice as fast, that means the gear ratio/reduction is 200% less, meaning to go half pedal stroke in Mid to get 4 mph, the HST will be working at twice the pressure.

 

[powerscol]

I usually run in mid range for normal work. Usually plenty of power. I just forgot to shift lower. The smooth running hydrostatic drive makes it easy to forget. Like I forget to take it out of 4WD after using it. I go slow anyway, usually running 1800 to 2000 rpm for my normal things. I'm still learning all the ins and outs of this unit. Yesterday I was using the float feature more to scoop and level a large section of ground. I tilled first to make it fluffy, the used float on the bucket to dig forward from a level spot. Worked great.

Just passed the 150 hour point. One thing I have learned is this unit is very picky on good fresh fuel. Had a can that was about 6 months old that made her run a bit rough. No water though. A good dose of Power service cleaned it right up.

 

[Gil Case]

Dealer told me that I need to run at 2100 rpm min for the HST to function properly, you are running a little below that. That is for my ck20hst.
Not sure if the optimum RPM is different for your model, but worth finding out.

 

[powerscol]

This week I change up my practice and used low range more - everything fine. Got into some heavy wet clay, digging deep that did put a load on. Buy slowing down in low range everything picked up and ran fine.