PTO speed.

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Amended 19/09/18

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drsmith
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PTO speed.

Post by drsmith » Wed Apr 18, 2018 2:26 pm

What PTO speed would be the best to run a Belmac 6ft single rotor topper off a 990 Implematic.High or Low speed pto.

joeproctor
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Re: PTO speed.

Post by joeproctor » Wed Apr 18, 2018 9:44 pm

light crop high box,heavy crop low box and low gear!

SteveCollett
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Re: PTO speed.

Post by SteveCollett » Thu Apr 19, 2018 11:11 am

Definitely 540 RPM at I think it is 1900 RPM other wise you will burn your clutch

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drsmith
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Re: PTO speed.

Post by drsmith » Thu Apr 19, 2018 12:19 pm

Thanks i just wanted to know opinions of what other users would say and their experiences.

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bedwards1966
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Re: PTO speed.

Post by bedwards1966 » Thu Apr 19, 2018 10:39 pm

There's no way that a 990 will be happy (or even able) to run a 6ft topper at the correct 540 speed in the 1000 setting, it's far too much load for that engine to cope at such low revs.

Scooby
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Re: PTO speed.

Post by Scooby » Fri Apr 20, 2018 6:18 am

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What he said. plus every time you turn on the headland the revs will drop and when you go back in again the speed won't be there. In 51 years of owning DBs I can honestly say, after trying it on fert. spreaders, haymaking machines, i.e. low HP requirements, the only time I have ever used 2 speed PTO has been on a sawbench.
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Three is twee, four does snore, but 6 just clicks........Scooby

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db2d
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Re: PTO speed.

Post by db2d » Fri Apr 20, 2018 7:51 am

Wherever possible the high speed should be selected on the tractor PTO and the appropriate speed reduction made on the implement ( rotavators, power harrows etc ) This reduces the pressures on the telescopic drive shaft.
The availability of the two speed PTO was a big selling feature on DBs in the 1960s when other tractor manufacturers were experiencing shafts being pushed into the tractor gearbox.

Scooby
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Re: PTO speed.

Post by Scooby » Fri Apr 20, 2018 9:25 am

Good luck with rotavating when using 1000 rpm on the P.T.O. I've owned 70", 80" and now 100" Howard rotavators as well as Kuhn power harrows in my contracting and farming business and using 1000 rpm doesn't work. :shock:
Last edited by Scooby on Fri Apr 20, 2018 2:01 pm, edited 1 time in total.
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Three is twee, four does snore, but 6 just clicks........Scooby

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db2d
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Re: PTO speed.

Post by db2d » Fri Apr 20, 2018 11:07 am

The appropriate gears had to be installed on the implement, not just selecting a lower speed. If the implement was supplied with gearing for another make of tractor, using high speed PTO did not work. The objective was to reduce the strain on the drive train, not the engine. I am referring to 1960s equipment

Scooby
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Re: PTO speed.

Post by Scooby » Fri Apr 20, 2018 2:06 pm

But if an implement was desigend for working at 1000rpm and had the gearing accordingly then it was a fine splined shaft at the input end and DBs couldn't handle those until late in the day when the reversible shaft appeared.
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Three is twee, four does snore, but 6 just clicks........Scooby

Gard
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Re: PTO speed.

Post by Gard » Fri Apr 20, 2018 3:02 pm

I have a 990 with a 5' brush hog, if the grass is not too tall or thick I can run with high speed on the PTO and low speed on the engine. If the engine bogs down I switch to PTO low speed and high engine speed, In both cases I am keeping the PTO RPM at 540 max.

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rid54
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Re: PTO speed.

Post by rid54 » Fri Apr 20, 2018 7:50 pm

As Gard says, it is all about what the engine can manage when it comes to torque. If the implement requires a certain PTO speed, you have to match that. If "hig gear" PTO puts too much strain on the engine, you downshift and use higher engine speed in "low gear" PTO. Most tractor engines have fairly flat torque vs speed diagrams, but it may be better to run the engine with some "headroom", i.e. not go for full power att low RPM, but rather let it run "lighter" at higher RPM.

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