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jdemaris
09-26-2003 18:41:41
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Re: john deere 350 b travel problem in reply to jim s., 09-26-2003 17:34:47
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Check the forward-reverse shifter cable all the way down to the control valve, and make sure it's making full travel into forward position. Also, make sure the clutch pedal is coming all the way back up. Most likely problem though, is something blown in the hydraulic circuit to the forward clutch pack, or the forward clutch itself. Either way, requires pulling engine and reverser out. It has its own hydraulic pump, and has a control valve assembly on the exterior of the reverser that is removable and/or serviceable without major dissassembly. However, since you say reverse works okay, things are narrowed down a bit. The main pressure control valve, and the clutch valve operate at 125-150 p.s.i. and serve both forward and reverse, so if it's malfunctioning, forward and reverse should be equally affected. You can try sticking a gauge in the 1/8 pipe theaded port on top of the control valve (kind of under your left foot when the floor plates are removed). See it the pressure is correct. By the way, there are two ports; one is lube pressure around 15-30 p.s.i. and the other is main clutch around 125-150 p.s.i. It is possible that, even if there is internal damage to the forward hydraulic circuit, you might be able to let more oil flow to it and get it working to some degree. Do this by reaching under the hydraulic control valve and open up the "rate of shift" trimmer screw. There's a small pipe plug that needs to be removed. Under it is a screw that takes a flat screwdriver, kind of like a jet in a carburetor. Turn it counter-clockwise to let more oil flow. It's purpose is to adjust the rate of shift from forward to reverse in a reverser that is working properly. In this case your going to put it out of normal adjustment. If this helps, it's still not a fix. It might, though, get you by for a while. There are a few other remote possibilities within the control vavle that COULD prevent forward from working but leave reverse intact . . . but it's unlikely. I've probably rebuilt or repaired a hundred reversers from 350s, and out of all of them, maybe two or three had problems due to the control valve. All the rest required removal and tear-down. Just out of curiosity, if you put the gear transmission in reverse, and the hydraulic reverser (a.k.a. shuttle shift) in reverse, can you push dirt okay going forward?
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