540 to 1000 mower pto speed change

[Gettin by]

Odd scenario as us often the case. Running a rear mower on 540 pto and investigating any options to alter it to 1000 speed pto so that it would be compatible with a front mounted mower that runs 1000 speed.
annoyingly the tractors rear pto speed opinions are 540e or 1000 speed. Thinking about bolt on reduction boxes? Any opinions or options appreciated.

 

[Sharpy]

Odd scenario as us often the case. Running a rear mower on 540 pto and investigating any options to alter it to 1000 speed pto so that it would be compatible with a front mounted mower that runs 1000 speed.
annoyingly the tractors rear pto speed opinions are 540e or 1000 speed. Thinking about bolt on reduction boxes? Any opinions or options appreciated.

What make and model mower?

 

[Fergieman]

Some mowers you could turn the gearbox around to switch from 540 to 1000.

Would be better to change gearbox than fit a reduction box.

 

[Blue.]

Had this with my fastcrap,front pto ran at same speed a rear on the 2100s ended up changing the front gearbox so that the it ran at 540,had the same with the Valtra,1000speed front and 1000 or 540e with the rear,just ran the rear slightly faster and the front slightly slower.

 

[Dave W]

Odd scenario as us often the case. Running a rear mower on 540 pto and investigating any options to alter it to 1000 speed pto so that it would be compatible with a front mounted mower that runs 1000 speed.
annoyingly the tractors rear pto speed opinions are 540e or 1000 speed. Thinking about bolt on reduction boxes? Any opinions or options appreciated.

Give us a bit more information.
What mower is it? most can have 540/1000 input, you just had too spec which one from new. Probably only a case of changing the input gearbox

 

[Bucks Boy]

Not that I’m suggesting you do it. Neighbour ran his 540rpm PZ 4 drum mower with conditioner at 1000 rpm for years. Never had a problem! He said it cut much cleaner and he could go faster. Tractor was only 70hp though. IH574 6’6” mower

 

[Dave W]

On Krone mowers they fitted cream gearboxes for 1000 input or green for 540. Output speeds were the same though

 

[Gettin by]

Thanks for the replies so far. John Deere (Kuhn) 342 mower conditioner. yes, it’s on a valtra and first gearbox is the same on this and bigger mowers. It’s the second box that would need altering potentially. Reduction boxes are a last resort in my mind as they’re rarely up to handling the power.
I obviously thought about splitting the difference and running both at 750rpm but I’m anticipating trouble going down that route.

 

[Dave W]

Thanks for the replies so far. John Deere (Kuhn) 342 mower conditioner. yes, it’s on a valtra and first gearbox is the same on this and bigger mowers. It’s the second box that would need altering potentially. Reduction boxes are a last resort in my mind as they’re rarely up to handling the power.
I obviously thought about splitting the difference and running both at 750rpm but I’m anticipating trouble going down that route.

342?
The 90 deg box under the headstock will likely dictate the speed. Pull the cover off and see if the gears are 1:1 or (hopefully) 1:1.25 increase. In which Case you may be able to flip the box and mount it in reverse

 

[Gettin by]

Crownwheel and pinion box is under the headstock. I’ll see what the gearing ratio is. Does it matter which is the driving and which is the driven shaft?
I assumed you always drive the pinion shaft but I’m often wrong!

 

[horace]

Hiya
You are overthinking and creating a problem that doesn't exist.
Front PTO is geared to 1000 rpm so nothing you do at the back will alter that. Stick the back in 540, rev it up and flat out I would expect you to see approx 600 out the back and maybe up to 1100 at the front. Drop them on the floor and crack on.

 

[Dave W]

Hiya
You are overthinking and creating a problem that doesn't exist.
Front PTO is geared to 1000 rpm so nothing you do at the back will alter that. Stick the back in 540, rev it up and flat out I would expect you to see approx 600 out the back and maybe up to 1100 at the front. Drop them on the floor and crack on.

He’s only got 540e at the back. So if I I’ve understood the rear will be 750 and front 1000

 

[Dave W]

Crownwheel and pinion box is under the headstock. I’ll see what the gearing ratio is. Does it matter which is the driving and which is the driven shaft?
I assumed you always drive the pinion shaft but I’m often wrong!

Have a look at the parts list. It often states number of teeth. Just from the picture it looks like too big a ratio

 

[Gettin by]

Just had another look at the first gearbox.
10 turns in the input gives 18.5 on the output.
that’s a 1.85 increase.
540input gives 999rpm output
Flip the box as Dave W noted and then
Input 1000 gives output 540 at rated pto engine rpm.
nope, I need 1000rpm output speed at engine 1000 front pto speed.
I’ll investigate the second gearbox and see if it anything in there is a better ratio.

 

[Horn&corn]

Just had another look at the first gearbox.
10 turns in the input gives 18.5 on the output.
that’s a 1.85 increase.
540input gives 999rpm output
Flip the box as Dave W noted and then
Input 1000 gives output 540 at rated pto engine rpm.
nope, I need 1000rpm output speed at engine 1000 front pto speed.
I’ll investigate the second gearbox and see if it anything in there is a better ratio.

Sounds like you need a replacement 1:1 gearbox. I’d be very surprised if anything to change in the second gearbox.
My kv you turn the first gearbox round to change 540-1000

 

[Simon Chiles]

Thanks for the replies so far. John Deere (Kuhn) 342 mower conditioner. yes, it’s on a valtra and first gearbox is the same on this and bigger mowers. It’s the second box that would need altering potentially. Reduction boxes are a last resort in my mind as they’re rarely up to handling the power.
I obviously thought about splitting the difference and running both at 750rpm but I’m anticipating trouble going down that route.

I assume you mean a JD 324. They were available with either a 540 or a 1000 input gearbox, I was given the choice when I ordered mine although it was many years ago.

 

[Gettin by]

Yes. Deere 324 rather than 342 as I stated. Right numbers, wrong order. As the output shaft speed required is 1000rpm I’d be confident in assuming the option on boxes is either the one I have or a 1:1 ratio. Not a big mower and not a new one but they last well as they’re not too heavy etc. It won’t last forever but no point in wasting its potential and I’m not about to buy a pair of mowers just yet. One at a time might have to surfice.
thanks.

 

[flywheel]

Not that I’m suggesting you do it. Neighbour ran his 540rpm PZ 4 drum mower with conditioner at 1000 rpm for years. Never had a problem! He said it cut much cleaner and he could go faster. Tractor was only 70hp though. IH574 6’6” mower

..I remember dad mowing with fahr 2 drum mower ...just didn't hear the normal sound ,yes he forgot t change back to 540 , 25 acre complete set of blades kaput &belts on mower fried ...

 

[killie_cowboy]

We've just bought a Kuhn PZ 280. Folk that had it before bought cog and shaft to convert it from 540 to 1000 for the same reason to run front and back. Came with the cogs to put it back to standard 540. We don't have a front tho, but still gonna leave it as is and run it at 1000e