Hello, My Hobart D300 would not engage in the 3rd gear anymore, I cannot turn the lever to that position. Would you be willing to give me some info or a service manual. I am mechanically inclined so I could fix it if I now what to look for.
Hobart won't give up service manuals The slide for your shift fork may be froze or corroded at top. The gear setups are fairly simple. The mainshaft nut comes off counterclockwise. The top gear has one way rollers with shims under the large washer. This gear assy must go back in the right way or you will break gears as soon as you start it.These mixers corode a lot at the top gearbox when they sit idle from moisture. Also check for broken gear teeth that may be jaming up he works. If you want to sell it let us know.
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Best guess is that the gear for 3rd speed is seized together with it's brass bushing and the center, large transmission shaft. I don't recall which gear is for 3rd, but the transmission has two gears (2nd and 3rd speed) which have brass bushings in them. The brass bushing should spin freely on the center shaft (when in final position - sometimes they pull off the shaft tough, but spin freely when in final position, my opinion is that this is OK), and the gear should spin freely of the brass bushing. My guess is that the 3rd speed gear, being seized to the center shaft, cannot freely idle on the center shaft, which would result in being stuck in 3rd gear.
The best thing I can point you to is HobartCorp. website you will have to become a new member it is free. Once you have become a new member you will want to log into spec sheets, type the model number D300, at the bottom of the page that pops up it will show parts catalog this will give you a blowup of all the gears and how they go together. Putting one of these together is not easy you may need to find some one to help you.
I hope that this helps you in your venture and thank you for using FixYa.
d-300 and d-340 mixers dont use oil they use grease -47 can be bought @any hobart office. there are several reasons why this problem can happen. try tighning the planetary nut all the way then back off 1/4 TURN .also do the same with the top main shaft nut if that doesnt work contact me back
The symptoms you are describing would lead me to believe that the shifter clutch sleeve (part # 70035-1) is worn out. There's a chance that the gear that engages the clutch is worn as well, but less likely. A significant amount of transmission disassembly is required to access and replace these particular parts. There are a lot of things that can go poorly if you don't pay attention to detail when disassembling/reassembeling the transmission of a D300 (ie clutch rollers and springs) On a brighter note, it's about a 90 minute job for a proficient technician, if everything goes his/her way. That money would be well spent.
I took mine all apart and the oil was just at the point of turning into grease. Nasty,, brown smelling ****.... I cleaned it all up and just used a sync 50w gear oil.. I over filled it and the extra ran out of the motor end of the gear box... It might have been about 2 table spoons too much.. Now it does not leak anymore.