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Caterpillar 973 failure

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greetings to all forum members. first of all apologize in advance because my language is not English, but have started to work google translator to understand and communicate with you.

I recently purchased a 973 serial cat 66g, at first glance the machine does not wear this because I never work with soil or rocks, but work in a warehouse storage of fertilizers.

the initial problem of this charger is that it did not move. only 1 meter and stopped. got a manual and started work. adjustments made in linking the servos and many other things.

Now the machine if it moves freely. forward back and sides, but after working 10 or 15 minutes the machine stops. enters the vent mode and guess. pulled the lever to park and then restart .and after stepping pedal and steering or try to push the bucket, it stops.

I put clocks in the 7 systems. I have given adjustment screw cutting synchronization clockwise to these tests.

venturi differential pressure.
differential pressure in the filter.
underspeed differential pressure valve
servo supply.

but .... when I test the machine with the clock connected in quick-connect charge pressure of 200psi drops to just under 100 psi which gives way to operate brake vent or spool start spool. that's just some of what I have gathered in this machine. to disarm the main control valve to a piece missing. 1u2604. check valve. the request and I came to miami. the mountain this week and the machine remains the same. not as if this piece he needed.

note that this machine was brought from Italy in 1998 and worked until 2009 in many years.And stop there remain several "mechanical" and was not given the revised with failure ..

I change oil and filters. first use a SAE 30. I thought the machine to heat lost all the oil viscosity change was equal to 15w40.

what I really want to know is where I lost that this charge is for pressure. servo cylinder? Charge Pressure Check Valve? pump varible displacement? no engine tracks. I put a hose in each of them and does not drain oil.

any comments that will help me to guide me I will be very grateful.;)

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