My CASE 621B only going forward and not reverse am told they check the solenoids and wiring. The auto mechanic says it’s the gear box ECM with a problem. Could this be real ? If yes where can I get the ECM I have attached the ECM and the machine serial
I doubt it's the ECU, as tranny still working in F. Please check solenoid M1. Will share some technical stuff in a conversation. Assume, tranny is a ZF 4WG150 with ECU EST 25.
Do you have a service manual? It will show you how to test your FNR switch with ohm volt meter for possible failure