JD 90 Skid Steer Onan motor dilemma

Posted by Aaron Leishman on April 07, 2005 at 07:54:29 from (67.40.106.216):

I’ve been lurking around here for a couple of months trying to acquire some knowledge on JD 90 skid steers, more specifically the Onan NHC 23 hp motors. I have a JD 90 that I bought last year. It’s never run great, but has been useable. But, that’s been changing. I’m down to about 20 minutes of use before it dies for the day. I’m a novice at small engine repair and am hoping to get steered in the right direction.

Here are the problems and the various solutions I’ve tried. It’s always been hard to start, especially during the winter. Once I get it started, it will run fairly well out of gear. When I engage the clutch, it bogs down quite a bit. When I start to move, it wants to die. If I take it out of gear, it will usually rev back up. Or, if I choke it about half way it’ll come back to life. I can usually nurse it along for about 20 minutes before it finally dies. After that it won’t start until it has cooled down. When it dies I can hear a sort of bubbling or gurgling sound if I listen to the air filter. To see if I can see the source of the noise I’ve taken off the hose that attaches the air filter to the carburetor. I don’t see any boiling gas or anything. I do see white smoke inside the carb.

I’ve tried the following with no measurable success: Changed the spark plugs (several times), each time they come back black. Changed the points, the condenser, ignition coil, spark plug wires. Adjusted the idle and high speed needles, and adjusted the governor stop. I took the carburetor off and blew it out with compressed air. I did not take the needles and blow out those little holes, maybe I should have. I adjusted the float, which was a bit off and allowed the carb to fill up with fuel. I’ve tried testing the spark plugs, but I may be doing it wrong, because I can’t get them to spark. I take them out and have held them close to the chassis and have also touched the outside of the plug to the chassis. I’ve only done this after it has died, there has never been a spark. Also, I have changed the fuel filter.

After all of this it will only run about 20 minutes, then die. It also seems to be lacking power compared to a year ago. Could there be water or dirt in the gas tank, or could the fuel jets into the carburetor be clogged? Or, could it be an electrical problem? I’m really at a loss and thought that you guys might have some ideas for me to try.

Follow Ups:

• Re: JD 90 Skid Steer Onan motor dilemma hahler 16:58:59 04/12/05 (0)
• Re: JD 90 Skid Steer Onan motor dilemma Gerald J. 08:17:22 04/07/05 (1)
  • Re: JD 90 Skid Steer Onan motor dilemma Aaron L. 00:51:47 04/13/05 (0)

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