Are You having to add fluid. Are You using the correct oil. Should be the same as You use in the engine; NOT Hydraulic fluid!!! Although some people use it.
25 years ago I went see a 620 at a dealer. Very nice looking but hydraulics were not working the salesperson thought the arms were stuck. He got a breaker bar & almost lifted the front off the ground. I went over & with one hand lifted the arms. He didn't realize they were already down. Then he checked the fluid level. It didn't measure on the stick so he went for a 5 gallon pail. Poured almost all of it in when I told him the Power Troll only held about 12 quarts. The look on his face is still in my memory. He took his hat off wiped of the sweat, & said I guess there an internal split in the S.O.B. They tore it apart, & that's what it was. Price went from $2800 to $5000 fixed when 620's were around $3000 for a descent looking machine. At that moment on the phone I said good luck; but I am sorry I cant justify the money. I didn't trust them fixing it; when they couldn't even diagnose it without my help!
If no one else can help try "MR. THINKER" of "Green Magazine". He's a marvel of these things!!!
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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