I have a 2008 komatsu pc78us-6 that all of a sudden the boom will not go up . No leaking down or weakness beforehand . The boom cylinder had just been repacked so I thought that was where the problem was. Took off cylinder and had it taken apart and checked and it was perfect. Put cylinder back on and it worked fine for about 1 hour. now it`s acting up again. Any help would be appreciated as my komatsu dealer is beyond outrageously high
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