- Location
- Agricultural Engineer, Lancashire
Hi,
I'm usually repairing the green brand of tractors so my experience of these Masseys is limited. I was helping a mate out this weekend who has an MF6840 Dyna-6 with a perkins engine. I noticed whilst driving the tractor it was flashing the brake pressure symbol and error code T151 was present. I questioned him to see if he'd seen the code before, he said that mechanics from an MF dealership had been out to the tractor and tried to solve the problem and had been unsucessful and spent plenty on parts! So my aim is to solve it once and for all. I've a tech manual for the tractor and have read up on how the system operates and cannot really understand why they replaced the following if the fault isn't with these components, especially as it is stuff they could test!
New pressure sensor, could have done a resistance check rather than replace?
HP brake block itself, unsure whether this would include the relief valve or accumulator or internal suction screen
New brake switches - if they checked continuity they could have isolated these parts.
The code relates to: Sudden drop in HP braking pressure (pressure measured by sensor less than 78bar) with no braking.
This to me suggests either a bad connection between sensor signal pin and Transmission control unit 1 (pin 35) or more likely a dodgy accumulator not storing charge and therefore pressure is dropped quickly after being initialised?
Could anyone advise me as to whether I'm on the right tracks or any past experiences of the same problem would be great!
Thanks in advance,
jd6820
I'm usually repairing the green brand of tractors so my experience of these Masseys is limited. I was helping a mate out this weekend who has an MF6840 Dyna-6 with a perkins engine. I noticed whilst driving the tractor it was flashing the brake pressure symbol and error code T151 was present. I questioned him to see if he'd seen the code before, he said that mechanics from an MF dealership had been out to the tractor and tried to solve the problem and had been unsucessful and spent plenty on parts! So my aim is to solve it once and for all. I've a tech manual for the tractor and have read up on how the system operates and cannot really understand why they replaced the following if the fault isn't with these components, especially as it is stuff they could test!
New pressure sensor, could have done a resistance check rather than replace?
HP brake block itself, unsure whether this would include the relief valve or accumulator or internal suction screen
New brake switches - if they checked continuity they could have isolated these parts.
The code relates to: Sudden drop in HP braking pressure (pressure measured by sensor less than 78bar) with no braking.
This to me suggests either a bad connection between sensor signal pin and Transmission control unit 1 (pin 35) or more likely a dodgy accumulator not storing charge and therefore pressure is dropped quickly after being initialised?
Could anyone advise me as to whether I'm on the right tracks or any past experiences of the same problem would be great!
Thanks in advance,
jd6820