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Great that its 'sorta running'. What's the back story of this tractor? Is it new to you? Was it sold as having an ok engine? Was the hole in the exhaust manifold there when you got it? Pretty unusual. FYI the starter switch is wired to keep power to the glow plugs while it cranks.

Its a MT - manual transmission with shuttle lever on left. Its not GST (glide shift trans) A few of the L3650's had the 'wet clutch', meaning the Ever Clutch. There would be EC decals on the hood, and reversing would not require the clutch pedal. If it has front wheel drive it's a DT...

If it were mine I'd first re-torque the head bolts - manual shows how. Then before turning the start knob try giving it a small sniff of starting fluid, like a quarter of a second, directed into the horn on the air filter. It won't hurt it and may help it start. If so let it run a while and...

If a whole compressor that fits your tractor can be had for $344 (see link in post #8 above) its pretty clear the Canadian prices are ridiculous. Look closely at the pics in that link to match it up with what you have on your machine - its likely a mass-produced automotive-type unit by a known...

With the engine shut off, and the a/c belt loosened, reach in front of the compressor, pushing in on the clutch face so the springs compress and turn the compressor. If it turns ok with moderate effort the compressor and sytem charge are probably ok. The coil inside the clutch can fail...

I use aftermarket clutch disks like this. They work just fine, last a long time (haven't ever replaced one) and the price is pretty good.

I shouldn't have just guessed at it based on old experience with machines. In the Separation sections of your manual does it say the shuttle parts have to come out for the trans & clutch housing to move away from the engine? It would seem the lever & shaft want to disconnect to stay with the...

If you discover stripped splines, there's something I'd try before shelling out for a new pump. Loctite 660 Quick Metal is made for repairing stripped splines - and it actually works ! The small size tube of it would be plenty for a pump spline repair - clean both parts thoroughly, put some on...

With two roll pins it isn't likely to be splined too. Probably just rusted on the shaft - did the keeper and bolt come out ok?

A long-shot possibility is if the prior owner put the wrong fluid in the tractor? Does it seem like regular hydraulic oil ? Should be like syrup. If it seems too thin, a reasonable experiment would be to drain just the power steering reservoir - and put in a couple quarts of straight 30w motor...

The governor linkage may have something disconnected - there should be two springs 7 and 8 in balance. I haven't worked on mine so maybe someone else will chime in. WSM pages 1-M1 and 1-M2 attached. Best luck, Dick B.

I just wanted to chime back in to say how nice it is to see you (and other posters) still interested in this L4150's return to a full life. I think you and this machine have become serious friends. Someday you may adopt another project but the thoroughness you've brought to this one is...

With a front pump, take out the 2 pump bolts and slide it forward, out of the coupling, and fish the belt out.

edited post #18 - see above

This HST has ELECTRONIC controls - we've been talking about mechanical causes but its very possible the issue is electrical. If the solenoid valves aren't working the tractor won't move. There are several electrical "faults" that could be preventing normal operation. Hope somebody posts about...

The next place I'd look is the battery negative cable. Check the end whwere it's bolted to the engine or tractor frame - I had one that looked good, but was frayed and corroded inside. A quick check is to connect a known good jumper cable between the battery post and a good ground - like the...

These older models used a Fusible Link in the wiring near the starter. It's a loop of special wire that can sacrifice itself if the battery is connected backward. They can corrode and stop conducting current. Ok to try using a loop of house wire instead temporarily until a new link can be...

Your B7200 is the original Kubota orange, used into the '80s until they switched to what they called Orange II - a little brighter with more red to it. I think your earlier color is great - looks vintage and authentic. Painting a tractor is really a lot of work and unless it started out as a...

My guess would be the range shifter is disconnected somewhere and is between gears. Taking off the platform takes some time and may not show much - Cover 070 comes off with 2 screws. Worth a look-see in there before diving deeper.

Anybody know how Grymmm1234 ever made out? Maybe he can go a similar route if he still has the machine...