pto generater

[tupmaster]

the engine on my generater seized last week
has anyone on ttf removed an engine and converted the genny to pto drive
I think its 70 kva genny
the engine was a deutz 8 cylinder air cooled
is it do-able and what pto speed would need to be achieved

tia

 

[TheTallGuy]

The alternator will run at either 1500 or 3000 rpm (should be on the rating plate) , so you will probably need to gear up your pto output to achieve that.

 

[Netherfield]

More than likely 1500, or it would have been geared up to start with, be easier to gear up from a 1000 rpm pto I would guess and less power loss as well..

Must be quite a beast you've got with an eight cylinder engine, how many Kva does it produce?

 

[davidroberts30]

More than likely 1500, or it would have been geared up to start with, be easier to gear up from a 1000 rpm pto I would guess and less power loss as well..

Must be quite a beast you've got with an eight cylinder engine, how many Kva does it produce?

70ish....

 

[roscoe erf]

70ish....

 

[Mur Huwcun]

A 70kva genny will need what, roughly 100-120hp when directly driven? On a PTO will power lossess, speed changes etc at full chat will need some tractor and a heafty PTO shaft?

 

[Pheasant Surprise]

the engine on my generater seized last week
has anyone on ttf removed an engine and converted the genny to pto drive
I think its 70 kva genny
the engine was a deutz 8 cylinder air cooled
is it do-able and what pto speed would need to be achieved

tia

The driving engine will need about 10% more power then the prime power (in KW) of the set.

So for example at 70 kVA @ 0.8 power factor that is 56 kW. Add about 10% to that and it’s 62 kW. Converting to HP and it roughly 83 horsepower.

Given that tractor engines won’t be as well regulated due to governor type than an engine on a genset, I’d over egg it and have about 100hp available to drive it.

Gear it up as said to most likely 1500rpm. I doubt it was a 3000 rpm drive unit, but best to check. It will be on the alternator plate.

 

[sjt01]

The driving engine will need about 10% more power then the prime power (in KW) of the set.

So for example at 70 kVA @ 0.8 power factor that is 56 kW. Add about 10% to that and it’s 62 kW. Converting to HP and it roughly 83 horsepower.

Given that tractor engines won’t be as well regulated due to governor type than an engine on a genset, I’d over egg it and have about 100hp available to drive it.

Gear it up as said to most likely 1500rpm. I doubt it was a 3000 rpm drive unit, but best to check. It will be on the alternator plate.

We have a 50 kVA pto genset for standby (ancient NJ Froment) and find we really need at least 120 hp tractor if there are any significant motor loads. Starting biggish motors will rock the whole lot! I once mistakenly allowed the 34kW motor to start, running with 120 hp tractor, and it halved the volts and nearly turned the genny on its side.

 

[Netherfield]

We have a 50 kVA pto genset for standby (ancient NJ Froment) and find we really need at least 120 hp tractor if there are any significant motor loads. Starting biggish motors will rock the whole lot! I once mistakenly allowed the 34kW motor to start, running with 120 hp tractor, and it halved the volts and nearly turned the genny on its side.

Be careful though, if you get the engine too big a boss of the alternator it's easy to keep piling a load on and burning it out, we had the same generator, I was on honeymoon and there was a powercut, came home to find the generator beyond econonical repair, only ever had a 72hp tractor until buying a DB 1690 , I seem to recall Froment's suggested a Ford 7000 was what was needed for that genny.

 

[startinghandle]

the engine on my generater seized last week
has anyone on ttf removed an engine and converted the genny to pto drive
I think its 70 kva genny
the engine was a deutz 8 cylinder air cooled
is it do-able and what pto speed would need to be achieved

tia

Did you forget to check oil level?
Or was there restriction in air flow?

 

[sjt01]

Be careful though, if you get the engine too big a boss of the alternator it's easy to keep piling a load on and burning it out, we had the same generator, I was on honeymoon and there was a powercut, came home to find the generator beyond econonical repair, only ever had a 72hp tractor until buying a DB 1690 , I seem to recall Froment's suggested a Ford 7000 was what was needed for that genny.

Just need to make sure you have an appropriate MCB for the genny

 

[startinghandle]

Just a thought.... if you remove the engine and connect a tractor pto it will
Be turning in the wrong direction!!!

 

[startinghandle]

I saved quite a few quid when I bought my 200 amp welder generator
Direct from manufacture

 

[Pheasant Surprise]

Just a thought.... if you remove the engine and connect a tractor pto it will
Be turning in the wrong direction!!!

Simple to change the phase rotation by swapping over the outbound cable on two of the line terminals.

 

[Blue.]

I once converted a 12kva to pto drive using belts,had it so 750rpm was running the genny at 1500rpm,if I ever did another I’d use 3:1 and run at 500rpm

 

[Pheasant Surprise]

I once converted a 12kva to pto drive using belts,had it so 750rpm was running the genny at 1500rpm,if I ever did another I’d use 3:1 and run at 500rpm

Did you get any belt slip under heavy load or machine startups?

 

[Blue.]

Did you get any belt slip under heavy load or machine startups?

No slipping,quiet compared to the gearbox type.

 

[Pheasant Surprise]

No slipping,quiet compared to the gearbox type.

Always wondered whether a (cam drive or Harley style) toothed belt would be any good - quiet too as you say.

 

[Blue.]

Always wondered whether a (cam drive or Harley style) toothed belt would be any good - quiet too as you say.

Seen a small ex army generator with a tooth belt on eBay recently,so it must be done.

 

[tupmaster]

Did you forget to check oil level?
Or was there restriction in air flow?