Good afternoon Curtis,
The Model Series 405777
The type 0113 E1
Code 990202 YG.
I thought it might be a coil breaking down thats why I changed both of them for the new modified type. But the exact problem still occurs.
I have checked the hour meter and it reads 271 hours.
I will check the tappet clearances tomorrow and give it another road test to see if that makes any improvement.
Apart from the grass box full warning switch, is there any other sensors on this tractor, what about low oil pressure, I've noticed there is a oil pressure switch fitted to this engine but no wire attached to it, there is no warning light on the instrument panel ether.
I have watched on Utube the stripping down of the Hydrostatic drive unit
and cannot see that there can be any connection to the breaking down under load symptoms that I have.
Even thought I have changed both coil units, do you think one could be faulty, it would be very un-likely of this, don't you think.
I have looked at the valve clearances, and they were not drastically out, the inlets were okay, the exhaust were a little slack not excessively though. I also checked the vacuum pipe to the petrol pump while I had the rocker cover off, that was fine as well.
I have adjusted the tappet clearances to .005" and put every thing back.
The engine started and runs fine. But I couldn't go out and work the the mower as its poring with rain here. Hopefully I can test it out tomorrow.
I was looking at that today and wondered what its purpose was, does it cut the fuel flow off when the ignition switch is turned off.
When the engine breaks down when it hot, when I joggle the drive pedal to try and nurse the tractor back to the garage, it do pop and backfire.
I will go for a test mow tomorrow if the weather lets me, If the engine breaks down as usual I will then remove the solenoid and plug the hole and do a further test.
Its got to be something electrical or fuel, if it was mechanical it wouldn't come and go,
I haven't taken the fuel pump apart yet,