NH 7840 sldp

agrimax

Member
Location
Co Down
PTO working ok on above tractor but speed display not showing on dash. Engine speed showing ok, just no PTO rpm. (full digital dash btw). Is there a speed sensor on these or where does the PTO rpm reading come from?
@forblue
 

essexpete

Member
Location
Essex
PTO working ok on above tractor but speed display not showing on dash. Engine speed showing ok, just no PTO rpm. (full digital dash btw). Is there a speed sensor on these or where does the PTO rpm reading come from?
@forblue
Did not realise that a digital dash was used on sldp. Does it have a 2 speed pto?
 

forblue

Member
What happens if you try and change pto speed readout by touching button on dash, if you have a 2 speed shiftable pto they should have a switch on lever in cab, speed on dash is a theoretical reading computed from engine speed sensor and because that's ok it points toward lever switch, never had this problem, is the pto light coming on dash ?.there is a possibility the wire from pto module to main harness connector is bad so dash is not getting signal.
 

agrimax

Member
Location
Co Down
Ta for replying.
I haven't looked at it yet. Neighbour's tractor. I'd guess he has pressed the button on the dash but probably not moved the speed selector lever. Could be a broken wire somewhere again as Mr Rat visited a small part of the wiring loom and I repaired those wires. He has maybe been back since! I thought there may have been a PTO sensor but I can rule that out...
 

agrimax

Member
Location
Co Down
Did not realise that a digital dash was used on sldp. Does it have a 2 speed pto?
Yes Pete,digi was available,it has 2 speed selectable pto and EDC hydraulics.

Had a quick look today and the button on the dash for pto speed doesn't do anything. Doesn't even beep.All the rest beep when pressed. The light on the dash comes on ok when the selector lever is moved to 1000 rpm.
 

agrimax

Member
Location
Co Down
Can't think of any local I could borrow but it's not critical.We know the engine rpm for 540 and thats the main thing.Will have a plunder behind and inside the dash when I get time.
 

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