This instruction show you guide on how to release hydraulic system pressure for Kubota U48-4 excavator.
Kubota Diagmaster 22.08.01
Kubota DST-i Diagnostic Adapter
Steps:
1. Place the machine on firm, level ground, lower the bucket and blade to ground level, and stop the engine.
2. Without starting the engine, place the engine starter switch in the "RUN" (B) position
3. Place the machine lock lever in the release position.
4. Operate each control lever for the boom, arm, bucket and swivel to full stroke.
5. Operate the travel lever, blade lever, swing pedal, standby pedal and service port pedal each to full stroke.
6. Place the machine's lock lever in the "Lock" position, and the engine starter switch to the "STOP" position.
https://www.car-auto-repair.com/kubota-diagmaster-v4-2-0-v4-1-2-software-free-download/