Wayne,
I'm with you about being leary about the fix. I really think there was something stuck in the check valve in the right side control valve just in front of the right side travel spool. I do have an on going problem with a 120-6 that has stayed with me for over two years. My client bought the grey market machine two years ago and when it worked in warm weather it would would not restart when hot. If it cooled down for about a half an hour it would start again. I checked the pressures and found LS pressure getting to the pump even with nothing working. The pump was holding 2600 PSI of pressure when the starter was trying to turn over the engine. About five months ago I got a helping hand from the dealer when they told me Komatsu had an update to a spool in the swing circuit. I installed the updated spool and the machine starts working right. I think I'm in fat city for a week when the client calls me a tells me the machine is back to the same. This time the dealer people tell me the auxilliary valve is the problem as there was a bad bunch from the factory. I install a new auxilliary valve section to the tune of $2,200 and everything is hunky dory again. Two weeks later I get another call from the client who tells me again the machine is acting the same. This time he has shutdown the machine and I go back and tear the compensator valve completely out of the swing circuit and still find nothing wrong. I have put it back together, put the gauges in and stalled the machine to get it hot. Sure enough I'm getting LS pressure into the pump again. This time though it's only about 1700 PSI. Now no one has any ideas. I'm about to tell the client that there is nothing anyone can do and if it bothers him that much to send the machine to auction or trade it off. Any thoughts or directions would be appreciated. Thanks, John C.
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