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I would think that these transmissions have straight cut gears so if one is popping out you can not have much tooth engagement. Look at your shifting forks being bent or cracked or maybe a adjuster for throw. Never had one of mine apart. So it is a guess.
check all the pins that hold the shifting levers on the drive section, they have been known to partially break giving weird issues with moving the tractors.
what I would do is use a test light or meter, ground one side of what ever you use, put the switch in the heat position and look for what terminal gets power in the heater position . Get a wire on that terminal carry it to a relay( I used a start relay off a riding lawnmower but they need a ground wire they are not self grounded thru the base) make that your power to activate the relay. Run a wire from the battery or starter and fuse or breaker it 30 amps should do it to one of the larger posts on the relay. Then take a wire form the other large post to the heater strip and you should be good to go. I would use 10 ga. wire for the large posts and I would think nothing smaller than 16 ga. for the smaller lug from the switch. You will not see a big discharge on the amp meter when heating wired like this just FYI.
it uses a common hot, all power from the switch comes from one source and switched out to what gets energy. You need to determine how the switch works as since there is no wire to the glow plug bar, did it come from the factory like that then the switch might not have a heat position. If the switch is marked on the dash that might be a good indicator as how it works . My tractor the switch turns to the left to heat. Try applying 12 volts to the glow plug bar to see if there is a current draw or a meter to ohms one side to the bar the other to ground it should read about zero ohms if one of the is working. Like in the earlier post a relay will make it heat better.
it should be on a spline , chances it is just stuck ,if I remember right there was no place for a puller I just tapped with rubber mallet from side to side till it came off. Use never seize on shaft before reinstallation of steering wheel,
I and others had some problems having the split pin in the 4 wheel engaging lever shear, I believe a quick fix was to put a pin inside a pin to strengthen it. But the balls falling out is common too.
if your tractor has a common sump as diff. trans, hydros ,power steering, universal tractor fluid is ok. If hyrdos only aw-32 is ok as long as you are not running in extreme heat conditions then aw-46 I would think.
glad you were able to post the pictures of those brakes, never seen that before, interesting . When you decide to lube things up use hi – temp. lube.
I am assuming that your tractor has dry brakes , if so take off the covers ,I think you will see two small shoes. They pivot one end and there is a cam on the other end that pushes the shoes onto the drum . I have a dong feng le 204a so I may be incorrect on what I am telling you. But mine the shaft that has the cam was dry and rusted as it went thru the housing so the brakes on that side did not work properly . took that shaft out used some emery paper on it lubed it lightly reassembled and it is good to go. Hopefully yours is similar.
