kubota kx 121-3 thumb with service code

[crh33]

Hello everyone, happy to find this forum. Have a kubota kx 121-3. 1526 hrs. Using and the thumb aux. had a code of 21. Will not work right now. Read my owners manual and could not find the code. Have not called the kubota yet, but the only thing I can figure out is it's time to change the Hydraulic suction filter and the hydraulic return filter. Does anyone know if I'm on the right track ??? I do need to order a service manual. Anyone else have a service manual and is it understandable for the average joe ?? I know I need to service the hydraulic filter and change fluid. The Hydraulic fluid is as clean as new from the site glass. Any help would greatly be appreciated.
THANK YOU !!! chr33 in colorado.

 

[40rentals]

hey there ive got a kx91-3s thats doin the same thing..did you find out what the problem was?? please call me at 208-762-3998 or leave me your number..john

 

[mflo999]

Hello everyone, happy to find this forum. Have a kubota kx 121-3. 1526 hrs. Using and the thumb aux. had a code of 21. Will not work right now. Read my owners manual and could not find the code. Have not called the kubota yet, but the only thing I can figure out is it's time to change the Hydraulic suction filter and the hydraulic return filter. Does anyone know if I'm on the right track ??? I do need to order a service manual. Anyone else have a service manual and is it understandable for the average joe ?? I know I need to service the hydraulic filter and change fluid. The Hydraulic fluid is as clean as new from the site glass. Any help would greatly be appreciated.
THANK YOU !!! chr33 in colorado.

Hi -- I know it is 6 years later but I am tearing my hair out over the exact same issue with my KX 121-3 of only 400 hours: the thumb fails with an error code of S/P 21. It happens intermittently, so of course when I took it to the dealer to fix they couldn't recreate the problem. Did you ever figure yours out? Many thanks for any help!