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Grey, like my 864 and other diesels here.
Also the rest condition includes waiting for the engine to cool down to ambient temperature.
Does not burn or leak oil or coolant.
Unreliably, it most often runs all day, and only occasionally drops into this low power mode after a couple of hours.
Also the rest condition includes waiting for the engine to cool down to ambient temperature.
Does not burn or leak oil or coolant.
Unreliably, it most often runs all day, and only occasionally drops into this low power mode after a couple of hours.
ByggareBobby
Member
- Joined
- Jan 3, 2024
- Messages
- 21
Something (filler filter?) on the bottom of your hydraulic tank that is loose and blocking the oil to your pump now and then?
Thanks to the advice on this thread I studied fuel starvation on YouTube and found it upstream of the fuel filter. It's running well for the moment after some compressed air to clear the fuel pickup, but I now know I have to drain and clean the tank itself. It's a 1981 machine and there's got to be a lot of debris in there.
A heartfelt thanks to all.
A heartfelt thanks to all.
It's amazing the stuff that can sometime end up in a fuel tank. Two examples come to mind in my 35+ year heavy equipment career. A 988 Cat loader would intermittently low power then die, and then inexplicably start right up again and run fine. Turned out to be a good-sized piece of oil absorbent in the tank would drift around on the bottom until it got close enough to the pick-up tube it would get sucked up and choke off the fuel. Had a log truck one time all of a sudden went from running just fine to just about no power at all. Still running, but clear down to granny gear and barely making the grade. Turned out to be a lengthy piece of black electric tape had sucked all the way up into the filter head where it wadded itself up in there. Took a while to find that one. Water absorb baggies on a string are another potential problem. Probably OK for a storage tank, but I would be very careful about having one in a piece of equipment.
Hydraulic tanks have the same vulnerability. Cat equipment always had a fine mesh screen in the fill neck. That screen went into the tank and drifted around down there and would occasionally (intermittent failure again!) suck up to the suck tube and choke off the hydraulic flow. This was a D10 with hydraulic powered engine cooling fan which would quit working seemingly at random. Frustrating. Sometimes you just have to go back to the basics.
ByggareBobby
Member
- Joined
- Jan 3, 2024
- Messages
- 21
I'm currently cleaning up and fixing my newly bought old 643. Disassembled the diesel and hydraulic tanks yesterday. This is what I found in my diesel tank ;-) Lots of small pieces of old hoses and both screen filters were rattling around lose at the bottom. My motor did not stall or show any odd symptoms (checked compression) but the lift and tilt seems weak so I took the decision to refurbish as much as possible including repacking all cylinders. Maybe half way through this work by now...
Attachments
That is quite a collection.
couple years ago had a similar issue on a 743 turned out to be a seed, it would suck up the tube and get caught in the elbow, sit for a short time it would sink down the tube and run fine for a short time, when we cleaned the tank there was several in the bottom with other debris but the seeds were the culprit, one was still in the elbow
