Good morning for Alaska. I have an M7500dt with 3900 hours on it. I just changed the oil, oil filter, fuel filters, and air cleaner. I purchased the tractor over the winter and it ran fine in -30 to +30 degree weather. Now that its summer it seems to be quit and is hard to start once its ran for a while. Last week I found a rotten fuel line between the sediment filter and the fuel pump, so i replaced that. It still has the same issue. I've noticed before it dies it will start to sputter a bit and loose power and then it will just stop running. I noticed once it dies and I turn it over it will not build oil pressure on the oil gauge until it cools down for a bit. I ordered a thermostat thinking maybe it has an overheating issue. The thermostat will be in next week. Any ideas???
Kubota M7500DT quits when warm
- Thread starter Will_jones5
- Start date
If it's hard to start when it's warm, it sounds like it could be an overheating issue. I would check the water pump too. Given the hours the machine has done, it's likely to be a combination of things - thermostat, water pump, injectors may need cleaning etc. I would give it a good going-over and while you're at it, flush and clean the radiator too.
Kubota's as a rule don't build a lot of idle oil pressure cold and even less hot so if you don't know what the actual acceptable pressure is, you are shooting totally blind. Time for a WSM (Workshop Manual). That will call out the pressures. You local dealer will have access to the Kubota WSM and will know as well. 3900 hours is in reality nothing far as meter time... if, and I say if the motor was maintained correctly. However 3900 hours on an ill maintained engine is a lot. You ever have the overhead ran? it's way past time for a valve adjustment, in fact it's double the time for an adjustment. Generally Kubota recommends a valve set every 1500 hours. When I have mine done (at the dealer), I have them spray test the injectors as well and if they find any to be substandard they are replaced with Kubota OEM units.
Time to take a hard look at the sediment bowl and fittings. I'm thinking the inlet is blocked with trash and it's starving the engine for fuel.
I just bought the tractor over the winter. It was running just fine when it was cold. Not exactly sure on the service history of the tractor. Living in Alaska, tractors are very hard to come by. As far as service departments, those are not an option up here. I have a service manual for it, so i'll most likely be tackling that myself.
First thought is that it is a fuel problem. As temperature gets warmer things expand and fuel thins. More likely for air to get sucked in. I would check and replace fuel lines, and tighten fittings. If possible, then get a sight glass into the line to check for bubbles.
Valve lash needs to be measured regardless. Part of routine maintenance.
If the injection pump has never been serviced, check the WSM or Operator Manual for maintenance period. I would start pre-planning a shop and downtime to get that looked at. But I would attack the fuel lines first.
Valve lash needs to be measured regardless. Part of routine maintenance.
If the injection pump has never been serviced, check the WSM or Operator Manual for maintenance period. I would start pre-planning a shop and downtime to get that looked at. But I would attack the fuel lines first.