[donmac]

A friend with an x590 that he just purchased says he thinks the aircooled motor has higher rpm than the x540 liquid that he just traded in!
Myself with both an x500 and an x540 am curious if anybody knows if this is true? if so it might change my use of the machines! I use them on different pieces of property so I don't have them side by side to do a comparison myself!

 

[RoyM]

Probably because the air cooled is noisier. I am not familiar with either machine. Are they not equipped with tachs?

 

[TUDOR]

I don't know the rpm of either, but both use the same K72 hydro which has a max input of 3400 rpm.

 

[donmac]

thanks Tudor! that answers the speed of the machine question! something I just thought of this morning is it possible with the fuel injection torque is higher and they've changed pulley sizes for the decks? what my friend thought was the blades were turning faster,
RoyM your comment on the sound could possibly be the answer,maybe he's just use to the liquids quietness! He's very particular with his turf and seems to think he's getting better results with the 590, same size deck and he has a bagger!

 

[Zebra5]

thanks Tudor! that answers the speed of the machine question! something I just thought of this morning is it possible with the fuel injection torque is higher and they've changed pulley sizes for the decks? what my friend thought was the blades were turning faster,
RoyM your comment on the sound could possibly be the answer,maybe he's just use to the liquids quietness! He's very particular with his turf and seems to think he's getting better results with the 590, same size deck and he has a bagger!

I doubt Deere would stock different pulleys for the same size deck for different engines. It would complicate things needlessly. :tango_face_wink:


That said I did install the 54" decks gear box pulley on 62" deck to increase blade speed. :tango_face_devil:

 

[donmac]

Probably because the air cooled is noisier. I am not familiar with either machine. Are they not equipped with tachs?

none of the machines have a factory tach. you need to keep a good ear out when blowing with the x500, a couple times I've noticed it icing up something on the carb linkage and overevving!

 

[mowergene]

Here's an inexpensive tach/hours meter like one I've been using on my LX178 for about four years. Copy & paste.

https://smile.amazon.com/Rhinoco-Mo...ywords=tach+and+hours+meter+for+small+engines

 

[UpstateTony]

Probably because the air cooled is noisier. I am not familiar with either machine. Are they not equipped with tachs?

I don’t believe that is true with newer EFi engines. When I bought my X590, I bought in transition year. So I had opportunity to test drive, the X530/540 and 590—the 590 and 540 were both considerably quieter than the carbureted 530 . Had a hard time telling which was quieter the EFI 590 or the 540- think the 590 was, but that’s just a guess. Anyhow what I think the difference the OP is experiencing is difference between the older Edge deck on the 540 and the newer Accel deck on the 590

 

[dave_r]

Here's an inexpensive tach/hours meter like one I've been using on my LX178 for about four years. Copy & paste.

https://smile.amazon.com/Rhinoco-Mo...ywords=tach+and+hours+meter+for+small+engines

I bought 10 of that style, they are hit and miss as to how long they last. Some appeared to be DOA, some failed fairly soon after I installed them, and a couple lasted for years.

But, if it stops working, you can pry of the back (mine had very little glue holding the panel on), clean up the inside (moisture can get inside), test the battery and replace if necessary, and it should be good to go again...

 

[jgayman]

A friend with an x590 that he just purchased says he thinks the aircooled motor has higher rpm than the x540 liquid that he just traded in!
Myself with both an x500 and an x540 am curious if anybody knows if this is true? if so it might change my use of the machines! I use them on different pieces of property so I don't have them side by side to do a comparison myself!

According to the OEM Kawasaki manual the X590 (FS730V) and the X540 (FD731V) both run at 3600 RPM.

 

[inspectorudy]

I have never heard of a small gas engine that didn't operate at 3600 rpm. I know many small diesels operate at 1800 but never gas.

 

[TUDOR]

I have never heard of a small gas engine that didn't operate at 3600 rpm. I know many small diesels operate at 1800 but never gas.

Gas engines are rated for 3600 rpm. The manufacturer will set the governor for the engine speed necessary to correctly support the transmission and/or specific attachments in accordance with the transmission manufacturer's specifications or the requirements due to gear reduction availability or government regulations for the specific implement speed. eg. The hydro may have a max input speed rating of 3200 rpm and the government stipulates a maximum tip speed for lawn mower blades. The tractor manufacturers like to keep things simple for the pulley sizes between engine and mower blades for inventory purposes and that may require a somewhat slower engine speed than 3600 rpm.

Hydros operated at speeds in excess of their rating run the risk of cavitation which will result in a shorter than expected service life. The K92 in the X7xx tractors is rated for a max input speed of 3200 rpm and is direct driven from the engine.

I believe that Onan made gas engine powered generators that ran at 1800 rpm for durability and noise reduction. There are probably a few other devices that operate at the same, or similarly reduced, speed. Grain augurs and conveyor belts come to mind.

 

[dave_r]

3600rpm is generally about the max speed the manufacturers set them to, but then equipment manufacturers will set them to lower speeds for specific needs.

I know Ariens turns down their Kawasaki FJ180V's for their LM21 walkbehind mower to 3200+-100 rpm, likely to meet some safety spec for blade tip speed [speculation on my part]. And I'm pretty sure the B&S engine on my Ryan aerator also doesn't run at 3600 rpm with the throttle at max speed (doesn't sound like it, but I haven't put an RPM gauge on it).

 

[donmac]

According to the OEM Kawasaki manual the X590 (FS730V) and the X540 (FD731V) both run at 3600 RPM.

this is the answer I was looking for! now I can tell my friend that his improved cut isn't a difference in rpm! i will have to take a look at his deck and see which model it is! I know he special ordered the deck and hdap's,wonder what the dealer put on it for a deck! I can also be comfortable knowing my 500 will drive the 44"snowblower just as well as the 540 and can keep them at there usual tasks,although there is probably some parasidic loss in HP with the 540 driving the waterpump and extra hydraulic pump! 3600 rpm is the number to look for, now to get 2 of those tachs! My elderly American friend from Ohio who helps me cut grass at the resort loves when I make additions to the equipment,can hardly get him off the x540 and have to keep him in check so he's not cutting grass at 7am and hide the key on the weekend!

 

[oldgibsonguy]

I own a 580 and when I picked it up I ran it side by side with a 590 also being picked up the same day. There was no difference in the engine volume at max RPM and there is no difference in the pulleys, belts or engine speeds. With the exception of the EFI, tilt wheel, and higher seat, they are the same machine in every way.

PS - HDAP tires are standard on the X580/590, and you can choose your deck size. I went with a 48" deck.