Thunderbird Food Mixers - Recent Questions, Troubleshooting & Support
Where do I drain the oil in a 60qt. thunderbird mixer
If you are referring to the transmission, I believe it's a sealed unit.
3-Speed gear box
Transmission: Wide-faced, hardened alloy steel, helical gears fully sealed in transmission lubricant with heavy-duty ball bearings and clutch combine for highly dependable, quiet operation.
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