could u tel me wat error 21 is n a 8360 new holland thank u?

Hydraulic error code 21. Draft control frequency potentiometer or curcuit failed.

Ash
February 2011

Turn the Draft / Position control sensitivity switch both directions fully then switch the ignition off and start up, this may cure the problem if it has not been operated for some time, if not remove the control panel and check the multi plugs behind it for a poor connection, if not then you need to contact a New Holland dealer as you need to go into diagnostics mode to check components.

Para Handy
December 2010