Something Ive always wondered

opininionated

opininionated

On final warning
doe.jpg

on the old Doe twin tractors, how did they synchronise the engine speeds, and was the gear change just by a mechanical linkage?
 
I've been trawling the back of my mind trying to remember what I've seen at Newark Vintage Show. I'm sure the early Triple Ds had a bunch of cables passed through a bit of lay flat hose across the turntable. There would be 3 for the gears, 1 for H/L, 1 for forward/back on the main lever and 1 for side to side. Whether they were linked to the gear levers on the rear tractor or not, I can't remember. Would be useful to leave the front tractor in neutral in some instances. I think the later ones had a big electric solenoid for the gear lever side to side movement.

Were hydraulic brake/clutch cylinders available in 1958? Might have been a big cable onto the front clutch on the early ones. Again, was it linked to the 2nd tractor pedal? Must have been, you couldn't press 2 pedals to stop quickly.

Throttle and stop controls would be simple bike brake cables. Were the front tractor's brakes coupled up is another question. Did 5000s have hydraulic actuated brakes?
 
deere66 said:
I've been trawling the back of my mind trying to remember what I've seen at Newark Vintage Show. I'm sure the early Triple Ds had a bunch of cables passed through a bit of lay flat hose across the turntable. There would be 3 for the gears, 1 for H/L, 1 for forward/back on the main lever and 1 for side to side. Whether they were linked to the gear levers on the rear tractor or not, I can't remember. Would be useful to leave the front tractor in neutral in some instances. I think the later ones had a big electric solenoid for the gear lever side to side movement.

Were hydraulic brake/clutch cylinders available in 1958? Might have been a big cable onto the front clutch on the early ones. Again, was it linked to the 2nd tractor pedal? Must have been, you couldn't press 2 pedals to stop quickly.

Throttle and stop controls would be simple bike brake cables. Were the front tractor's brakes coupled up is another question. Did 5000s have hydraulic actuated brakes?
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Ford 5000 has mechanical brake actuation
I've seen the pipes and cables in the layflat pipe to the front tractor
 
Multi-power said:
I'm sure the front one ran at slightly more revs
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I suppose there will be a degree of self synchronisation,if the front is revving harder it will try to pull the rear which will tend to put power back through the transmission and power the engine, wheel slippage allowing slight variation.
 
opininionated said:
I suppose there will be a degree of self synchronisation,if the front is revving harder it will try to pull the rear which will tend to put power back through the transmission and power the engine, wheel slippage allowing slight variation.
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Any half decent driver should be able to control both throttles to give a little bit more pull on the front
 
opininionated said:
View attachment 21356

on the old Doe twin tractors, how did they synchronise the engine speeds, and was the gear change just by a mechanical linkage?
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Who said they were synchronised??? Like 4WD Ford Falcon utes you always want the front pulling harder than the rear in order to get maximum traction.
Also like most twin engined cars the front one will always be tweaked more than the rear.
 
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Phil the Dill said:
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Now that is what I’d call a double doe 👌 I’d sit happily on that all day long 😎😎😎😎
 
We had a 130 here when I was a kid, 2x pre-force 4000s if I remember correctly. I don't really remember the technicalities of it (I'd have only been about 7 or 8 years old when it went) but it was blooming noisy sat on the front tractor on a heap of sacks going up and down the field!
A neighbour replaced the back tractor of a 150 with a 7000 (he wanted to change the front one too, but never did for some reason). He used to tow a 15 ton excavator on a low loader with a dolly around which was great fun pulling out of gateways. He was halfway down the road before he could see, and almost at the next junction before he was out the field!
 
Bovrill said:
We had a 130 here when I was a kid, 2x pre-force 4000s if I remember correctly. I don't really remember the technicalities of it (I'd have only been about 7 or 8 years old when it went) but it was blooming noisy sat on the front tractor on a heap of sacks going up and down the field!
A neighbour replaced the back tractor of a 150 with a 7000 (he wanted to change the front one too, but never did for some reason). He used to tow a 15 ton excavator on a low loader with a dolly around which was great fun pulling out of gateways. He was halfway down the road before he could see, and almost at the next junction before he was out the field!
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Pre Force 4000 would be the short stroke 3.1 litre engine rather than the latters 3.3 litre square engine. Equally neither variant would be recommended with a cab as you wouldn't believe the noise that bounces back at you compared to 2 post ROPS!!!!
Don't even ask how I know...
 
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