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jdemaris
04-06-2004 05:35:32
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Re: Re: Re: JD 350B Reverser Problem in reply to Al Jewett, 04-06-2004 03:30:46
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Okay, so the reverse function is not working in the hydraulic reverser but forward is functional. The most obvious thing to check is the linkage going to the shifter; make sure it is engaging fully into reverse. Also, is your "rate of shift" screw adjusted properly, i.e. how was the crawler shifter between forward and reverse? Normally, with the crawler at half throttle and the gear trans. in second gear, you should be able to shift from forward to reverse without touching the clutch pedal, and it should be a firm but not harsh shift. If it's adjusted too soft, it could make one of the functions slip. There is a trimmer screw underneath that adjusts like a carburetor jet to increase or decrease the rate of shift. Next, you need to put a pressure gauge into the pressure port in the reverser hydraulic control valve. It's pretty simple. When your sitting in the crawler, it's around where your left foot is. Take a floorboard off and there's there's the valve body. You'll find two 1/8" pipe plugs, probably with an Allen wrench drive. One is the lube/release port and the other is clutch pressure port. As I recall, the one that is closest to the front is the lube/release port, and in some applications it has a sending unit stuck into it to operate an "idiot light", but that's usually when used in 1010 crawlers. Next one back is the clutch pressure port. Stick a 0-300 or something capable of reading 150 PSI into the port. A grease-gun hose hooked to a gauge works nicely. Then, put the crawler's gear transmission in neutral and run the engine at half speed. Observe the pressure when you put the reverser into forward and reverse. Pressures should be equal an over 100 PSI. If you get a an overall low reading, you might be able to shim it up. If you get a low reading in reverse only, you've probably got internal problems, but there are some other things to check first, in the control valve.
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