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Cat 304cr mini problem...

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Ok guys back in the early fall 70 degree weather I was called out to work site ...The 304 couldn't walk its self out of a hole 3 feet deep not a very steep ramp grade out of ditch with out the bucket helping it ....2 weeks later no start ....6000 hours on machine ....Now
Things I have replaced last year all injectors and glow plugs new caterpillar parts
Older tech that was helping me with a bigger job asked me what was up with mini I tolded him and he grabbed a can of ether and said mind if I have a look I said no but I don't like ether, my boss was there and said let him check it out .
Smoked no start .really didn't spin over fast enuff for me
he pulled dip stick and sealed blowbye tube and said spin it over I did and he said rings are gone I asked how can you tell he tolded me watch and boss spun machine over and he said stopped released fingers off tube and air blew out ....Back of my mind I think this is a sealed system no blow bye tube open
I check older threads here often ....I notice one same thing but was slow to start but does start and mention of hydraulic problem
I start back to work tomorrow after 2 weeks off paid for Christmas and new years...Nice I like this
But I think tomorrow I'm pulling hydraulic pump far enuff off engine to see if it cranks and see where it goes from there.....
Ill report back what I find ..

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