Mf 6480

[spudman*2008]

Was fitting 2 new batteries this morning and got distracted by phone forgot to turn on isolated key jumped into cab and started tractor no problem switched key off and suddenly remembered about isolated key turned it on and now tractor wont start checked and changed revalant fuses swapped over relays from another I have and still wont start swapped charge stick to no difference any ideas tractor will turn over but no smoke out of exhaust so no diesel getting to pump tier2 model any ideas what a prat I am sodden phone

 

[mf7480]

Unbolt the terminals behind the isolator and bolt them onto one post, that isolator often gives hassle

 

[davidroberts30]

Was fitting 2 new batteries this morning and got distracted by phone forgot to turn on isolated key jumped into cab and started tractor no problem switched key off and suddenly remembered about isolated key turned it on and now tractor wont start checked and changed revalant fuses swapped over relays from another I have and still wont start swapped charge stick to no difference any ideas tractor will turn over but no smoke out of exhaust so no diesel getting to pump tier2 model any ideas what a prat I am sodden phone

Turn the insulator back off??

 

[KRO]

Had similar problem on massey7726 last week, turnover but not start,
We found out there is a 3amp fuse down by the battery that gives earth protection can sometimes blow on a surge. Worth a look ,hope this helps

 

[mf7480]

Unbolt the terminals behind the isolator and bolt them onto one post, that isolator often gives hassle

 

[spudman*2008]

No difference sadly I must of blow something

 

[daveydiesel1]

No difference sadly I must of blow something

Our 6499 has fuse on 1 o the leads from the battery. Worth a check. Have you tried cleanin where the earth lead is bolted onto tractor our 4370 used to need this done with wire brush regularly

 

[spudman*2008]

Hi there and thanks for help so far only getting back to the tractor this evening sadly no fuse there either and have cleaned up earth points how many lives go to the pump when the key is turned on am only getting one live fuses are ok have triple checked them

 

[classic cutter]

our 6499 has a fuse right next to the isolator switch under a small plastic cover

 

[Cowabunga]

Early Tier2 models had the isolator on the Earth lead and later ones have it on the live. Or the other way about, I can't remember which. Neither can I now remember why they changed. On one or the other there is a little lead to the top of the cab, from the isolator, that has a simple single fuseholder very near the isolator. IIRC that could blow if 'playing' with the isolator, preventing the engine starting. It is a long time since I 'played' with these, so although the basics above are correct, the detail may not be.

 

[spudman*2008]

Mine is on the earth side the isolator have checked and followed leads no fuse holder have found a small black box shape plastic piece about 50mm bt 30mm by 75mm long at the end of wires behind the engine and between the cab any ideas what that is many thanks to all so far

 

[jms37]

I've a tier 3. Remember hitting the isolater once with the tractor running.
I'd blown the fuel pump fuse. Worth checking.

 

[jms37]

I've a tier 3. Remember hitting the isolater once with the tractor running.
I'd blown the fuel pump fuse. Worth checking.

 

[jms37]

I've a tier 3. Remember hitting the isolater once with the tractor running.
I'd blown the fuel pump fuse. Worth checking.

 

[Bloders]

does it have a fuse, looks like a stick of dynamite mounted vertically sort of to the left of the fuel pump?

If so, check that.
Ours had continutiy across it, but not enough to feed the fuel pump.
Would crank over fine, but no power getting to the pump.
ours is a 6460 but could well be the same??

 

[Speedstar]

Was fitting 2 new batteries this morning and got distracted by phone forgot to turn on isolated key jumped into cab and started tractor no problem switched key off and suddenly remembered about isolated key turned it on and now tractor wont start checked and changed revalant fuses swapped over relays from another I have and still wont start swapped charge stick to no difference any ideas tractor will turn over but no smoke out of exhaust so no diesel getting to pump tier2 model any ideas what a prat I am sodden phone

as said it will be the dynomite stick that is the problem

 

[spudman*2008]

Hi all thanks for your help so far but no joy have another t2 6480 swapped over the ECU,key switch and the other stick with 4 wires out of it has made no difference at all am wondering has it done something to the unit on of the Bosch VP pump she turns over fine but no smoke out of exhaust or can anyone point me in right direction as to what 12v power is at pump have 12vs in one lead my other 6480 has only 1 to

 

[Chae1]

There's a sensor on the crank. It doesn't pump fuel until its spinning at a certain speed.

The fuel pump has it's own ecu. Have you tried swapping it off orher one?

We went through all this on our t2 6480 in the end it was ecu on fuel pump.

 

[spudman*2008]

Not yet will do tomorrow many thanks

 

[Farmer_Joe]

fuel pump went on mine, someone linked an excellent method for testing if you search my posts you will find all you need.