The B2650 count down has begun!

[Rock Crawler]

It's so much more than my BX it's hard to describe. Set your pressure up at the high side and likes your straddling the incredible hulk. It's a beast dude!

 

[Rock Crawler]

So, I put the 72" finish mower on today and cut my yard. Nope. The PTO has enough power in flat ground, but as soon as I got any slope it sucks the engine straight down. Not enough horse power to run the wheels while the PTO is engaged. On perfectly level, it's great. That's it.

I'm going to try to sell it or do a trade in CL for a 60".

 

[Dan33Klein]

So, I put the 72" finish mower on today and cut my yard. Nope. The PTO has enough power in flat ground, but as soon as I got any slope it sucks the engine straight down. Not enough horse power to run the wheels while the PTO is engaged. On perfectly level, it's great. That's it.

I'm going to try to sell it or do a trade in CL for a 60".

View attachment 548952

Larry, sorry your not having luck with the 72”. That’s why I posted awhile back about my
2650 being down on power to run my rear snow blower and wish I had more pto horsepower. But oh well. Doesn’t kubota offer the 72” mid mount mower tho? I wonder why the rear one takes so much more power.

 

[Rock Crawler]

Land Pride makes a heavy duty 72" (what I have) with a larger gear box, but they also make a lower Max power rated version. Maybe the gear box on this one is taxing my little B2650 beyond what it can give?

 

[Dan33Klein]

I wouldn’t think so. Unless the gearbox is getting the blade tip speed higher. That would take more horsepower. I just can’t see it needing much more than the MMM

 

[goeduck]

So, I put the 72" finish mower on today and cut my yard. Nope. The PTO has enough power in flat ground, but as soon as I got any slope it sucks the engine straight down. Not enough horse power to run the wheels while the PTO is engaged. On perfectly level, it's great. That's it.

I'm going to try to sell it or do a trade in CL for a 60".

Makes sense. I run a 45 HP on my 72 BH. Finish mowers can take some grunt depending on the grass.

But I will say the B2650 did well to handle it at all. Nice looking with, I assume, those larger tires.

 

[Rock Crawler]

Makes sense. I run a 45 HP on my 72 BH. Finish mowers can take some grunt depending on the grass.

But I will say the B2650 did well to handle it at all. Nice looking with, I assume, those larger tires.

Thank you. And yes, it has the optional larger tires and wheels from the B3350SU.

 

[goeduck]

Thank you. And yes, it has the optional larger tires and wheels from the B3350SU.

Nice. Makes it look like an L frame. :thumbsup:

 

[check]

Thank you. And yes, it has the optional larger tires and wheels from the B3350SU.

Those larger tires will of course suck more torque from your motor, which may be one reason why your engine bogs down when you go uphill with that 72 inch mower.

 

[Rock Crawler]

Those larger tires will of course suck more torque from your motor, which may be one reason why your engine bogs down when you go uphill with that 72 inch mower.

I'm not talking up an actual hill. I'm talking a slight slope! I'm trying to cut cross hill, and just the natural crown of the hill will stall it out. The tires cost you 7% torque, that would not be near enough to solve this.

 

[beckmurph]

I'm not talking up an actual hill. I'm talking a slight slope! I'm trying to cut cross hill, and just the natural crown of the hill will stall it out. The tires cost you 7% torque, that would not be near enough to solve this.

What range are you cutting in? Are the blades sharp?
I have a steep section beside my house, and my 60" Woods rfm will pull the rpms down if I am in mid range with heavy wet grass.
A 72" mmm is offered with the 2650.:2cents:

 

[Rock Crawler]

Blades were just sharpened and balanced. Freshly greased. New belt and tension spring. Low range, and full throttle on the mild up slope with RPM pulling down to 400-ish PTO or 1800 engine RPM, in the flat and down slope mid range and holding around 2200 engine RPM.

 

[Dan33Klein]

I'm not talking up an actual hill. I'm talking a slight slope! I'm trying to cut cross hill, and just the natural crown of the hill will stall it out. The tires cost you 7% torque, that would not be near enough to solve this.

Larry, out of curiosity were you in M range?

 

[check]

Your PTO hp is only 19.5, which is one reason why I never upgraded grom my 17.5 PTO hp BX25. A lot of the rear implements I was looking at required a minimum of 20 hp.

 

[skipperbrown]

I would have to half my speed when pulling a 72" brush cutter up an 8 degree slope with my 3940. It requires a lot of HP just to pull a tractor up a hill. You will likely still run slower even with a 60" deck.

 

[beckmurph]

Blades were just sharpened and balanced. Freshly greased. New belt and tension spring. Low range, and full throttle on the mild up slope with RPM pulling down to 400-ish PTO or 1800 engine RPM, in the flat and down slope mid range and holding around 2200 engine RPM.

I run the rpm's up to 2500. That is right at 540 on the pto.
On my steep incline, I need to back off the hst by half and slow way down, to keep the rpm's up.

 

[rkidd]

I run the rpm's up to 2500. That is right at 540 on the pto.
On my steep incline, I need to back off the hst by half and slow way down, to keep the rpm's up.

As beckmurph says, rear pto speed is 2400rpm and mid pto speed is 2500rpm and is where you should be running when mowing. From what you are describing you are mowing at 2200 rpms which can make a difference. Those tires or heavy duty gearbox or both must be robbing some power. It might be the larger tires compound the problem on the slopes of robbing power. I dont know the answer to that. I have run my 72" land pride rfm for 3 years now with no problem with running out of power on all types of mowing. Not saying you cant slow it down in some thick spots, and just backing off on the hst will take care of it. I am really surprised that if you are at the pto rpm (2400-2500) and in low range on the hst that you are having that much problem from all of my experiences under normal mowing circumstances. Of course really heavy grass or steep grades can sure bring even an 80 hp. tractor to its knees!

 

[Rock Crawler]

I'm running totally full throttle, balls out, but moving less than walking speed. In no way am I trying to run lower RPM, that's just what I get because of the load on it.

The only other thing that I can think of is the fact that I'm set very low, 1 x 1" spacer on the bottom of the front wheel yokes and 2 x 1" spacers on the bottom of the rear wheel yokes.

Possibly, being that it's set so low and tight to the ground... Maybe it's struggling to suck air and doing a lot of work to fight that drag in the airflow? I'm going to try 2 x 1" on each front yoke and 3 x 1" spacer on each rear yoke and see if that has an effect on it.

After that, the only things left would be drag on the spindles turning the blades, or drag in that gear box. The blade spindles all feel similar, so unless all 3 are degraded the same amount, I'm saying that the spindles are fine. The gear box, I'm not sure how to know what is normal drag and what would be excessive. I'll try at least one more time though when the grass is ready to cut again.

 

[rkidd]

I'm running totally full throttle, balls out, but moving less than walking speed. In no way am I trying to run lower RPM, that's just what I get because of the load on it.

The only other thing that I can think of is the fact that I'm set very low, 1 x 1" spacer on the bottom of the front wheel yokes and 2 x 1" spacers on the bottom of the rear wheel yokes.

Possibly, being that it's set so low and tight to the ground... Maybe it's struggling to suck air and doing a lot of work to fight that drag in the airflow? I'm going to try 2 x 1" on each front yoke and 3 x 1" spacer on each rear yoke and see if that has an effect on it.

After that, the only things left would be drag on the spindles turning the blades, or drag in that gear box. The blade spindles all feel similar, so unless all 3 are degraded the same amount, I'm saying that the spindles are fine. The gear box, I'm not sure how to know what is normal drag and what would be excessive. I'll try at least one more time though when the grass is ready to cut again.

Hey Larry The one thing that concerns me is that you say when you are running the flat or running down hill your rpm is running at 2200 rpm and you have it set at 2500 or full throttle. On mine if I set the throttle at 2400 rpm 540 pto speed, it mows there at that rpm no problem unless I get into some really thick stuff it might drop a little till I get through it. Not sure why yours would drop 300 rpm under full throttle and stay there under regular mowing conditions. Just trying to give you a comparison on 2 different Land Pride units so maybe you can find some answers. Ron.