Recent content by 4270

Got it sorted. The loose ‘exciter wheel’ was the problem. A spot of weld to hold the wheel on the shaft. Hopefully it lasts. Tractor is shifting and engaging the clutch perfect now. The sensor is giving out a voltage ranging from 2Vac at idle to 8Vac at 3/4 rev! Before it was below 1v at idle...

It’s on the shaft that drives the external hydraulic pump, in the housing that the pump is bolted onto. At the backend of the tractor. PTO , road speed and engine speed sensors are all at the backend!

I’m interested in the voltage it will put out when exciter wheel is fixed!

I put the multimeter on the ‘sensor’. At idle less than 1v ac, it went up erratically to about 2.2v ac at about 1/4 rev, and didn’t increase after that! I’m using an old analog multimeter so that’s why my readings are abouts!! This convinced me that the problem was the exciter wheel, as it’s...

Ok It’s like a mini dynamo or alternator. The coil, r the core must give the 450ohm resistance! I’ll put the multimeter on the sensor wires with the tractor at different revs and see what happens. I’ll keep ya posted Cheers

Do those type sensor need voltage to work or does the sensor generate the signal. I’ve been told the sensor should have a resistance of about 450 ohms

Shifts as normal, just needs that extra bit of extra rev. While I wouldn’t be concerned about the rev counter, I think I need to get it working first to eliminate that it’s causing the problem with the shuttle. I’m tempted to join sensor wires together, but afraid of damaging something else!!

That’s my understanding also fedup, though it’s not a modern tractor 22 yrs old! It stays in neutral (stops moving) when you try to move at low revs and sometimes goes into neutral. There is no indication on the dash your in neutral. Slightly newer machines would have R N F on the dash as an...

Thanks bczoom👍

Thanks for reply Fedup Yes, both directions same symptoms. When the RPM sensor is disconnected the tractor doesn’t move at all!! All other hydraulic functions are fine. The sensor is worked by a gear passing around it at back of hydraulic pump. Do you know how these sensors work? Does it act...

Hello all I’m new here and come across this forum when looking for answers! 4270 24x24 power shuttle won’t move when at low revs. Also the Rev counter stopped working about the same time. I’ve changed backend oil and all the filters and put in a new engine speed sensor. Should there be 12v at...