Catipillar 312 c swing motor lock solenoid location

[Dave Sutton]

Hi working on an early 321c escuvator. The swing will not rotate from straight ahead setting . Hydraulics load up when trying to swing suspect the lock solenoid, but unable to locate the solinoid location. Please can someone advise me on the location thanks Dave

 

[DEMLONE70]

Serial number ?

 

[Dave Sutton]

Serial number ?

12RF234 serial number. Manufactured 4/05

 

[Nige]

12RF234 serial number. Manufactured 4/05

Sorry that doesn't match any 320C Serial Number I can find, neither does it appear in the S/N Index.
Could you post a photo of the S/N plate please.?