The power of chipper power!

[Mike Hill]

Here is my Jensen 6" Tracked machine in action.

 

Its chipping Lime,your machine should be devestating the lenghts your man was feeding it.

 

[ame=http://www.youtube.com/watch?v=EZ6ARLjS64s]Jensen tracked chipper - YouTube[/ame]

[Old Mill Tree Care]

Here is my Jensen 6" Tracked machine in action.

 

Its chipping Lime,your machine should be devestating the lenghts your man was feeding it.

 

[ame=http://www.youtube.com/watch?v=EZ6ARLjS64s]Jensen tracked chipper - YouTube[/ame]

 

Thanks for posting that Mike but I'm not sure I see your point.

Your chipper was doing 5" and mine was doing 8&9".

I've hired in those tracked 6" in the past, great machines.

 

 

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[Mozza]

Thanks for posting that Mike but I'm not sure I see your point.

Your chipper was doing 5" and mine was doing 8&9".

I've hired in those tracked 6" in the past, great machines.

 

 

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Really? Them bits in your vid didn't look like 9 inch mate.

[skyhuck]

Really? Them bits in your vid didn't look like 9 inch mate.

 

Indeed, if they were 8/9 inch I'm a much bigger boy than I thought

[Mike Hill]

Here is my 10" Jensen with 80 HP Chipping.

 

Sorry no Pelvic thrusts.

 

I think the input PTO speed on your machine is to slow.

 

[ame=http://www.youtube.com/watch?v=-CpsQHBGdVQ]My big chipper!! - YouTube[/ame]

[Old Mill Tree Care]

That's more like it Mike, thanks. Well that seals the deal for me and proves (I think) that my Unimog really does only have six horse power!

Damn it!!

 

When the RAF carpet bomb all gypo camps and we can start charging properly I'll get a new engine. Lol!

[Old Mill Tree Care]

How funny, it transpires that by doing what EVERYONE else said and running in 540 and at a different speed, there's nothing wrong with the unimog power.

It appears that it was all an illusion of sorts due to the low speed at the shaft 1400rpm.

 

So thanks for all your input, and I'll rename this thread the powers of Arbtalk power!

 

Lucky really as I was thinking I should put a 600hp engine in the Mog

[b101uk]

If you are running at 1400rpm engine and you have it in the 1000rpm pto gear you will have the pto shaft spinning ~603rpm if it’s a pre 92/93 mog with the 2.32:1 ratio 1000rpm gear or ~639rpm if it’s the post 88 mog with the 2.19:1 ratio 1000rpm gear.

 

The relevant ratio’s of the MBU & SBU 540/1000rpm transmission or live PTO boxes are:

 

Older type:

540rpm gear = 4.08:1, thus 540rpm * 4.08 = 2203rpm engine.

1000rpm gear = 2.32:1, thus 1000rpm * 2.32 = 2320rpm engine.

Spinning the 1000rpm gear @ 540rpm = 540rpm * 2.32 = 1253rpm engine.

 

Newer type:

540rpm gear = 3.85:1, thus 540rpm * 3.85 = 2079rpm engine.

1000rpm gear = 2.19:1, thus 1000rpm * 2.19 = 2190rpm engine.

Spinning the 1000rpm gear @ 540rpm = 540rpm * 2.19 = 1183rpm engine.

 

Between ~1988 & ~1992/93 its possible to have had either box type fitted at the factory, though the older type was aimed at older OM352 powered 424, 425, 435 types while the new was aimed at the OM366 powered 427 & 437 types with some crossover for the euro 1 and early euro 2 OM366/A while the OM366LA (intercooled Euro 2+) should have the newer type – note dealers/people can easily retrofit PTO box onto mogs that did not leave the factory with them so much newer mogs may have old type pto box and likewise older mogs may have the newer type box.

 

If your no-stress cuts in at 540rpm on the shaft then you need to be running ~600rpm on the shaft no-load which also gives the required ~250rpm +-50rpm pull-down for the engine rpm so the load governor on the injection pump works to its best extent altering power delivery vs. load to try to keep the RPM's stable

[Old Mill Tree Care]

Holy cow! Just when I thought I understood it all........

Now I'm definitely confused but thanks for posting. I'll try and figure out how it relates to my Mog.

 

 

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