Practice question

What must you do before connecting or disconnecting hydraulic hose quick-couplers (Hydraulik-Steckkupplungen)?

Increase engine speed to maximum throttle
Relieve the residual pressure (Druckentlastung) by switching off the engine and moving the spool control levers through their positions in both directions
Raise the implement fully so that its weight holds the pressure in the cylinder
Disconnect the battery so the electro-hydraulic valves cannot open

Answer: B — Relieve the residual pressure (Druckentlastung) by switching off the engine and moving the spool control levers through their positions in both directions

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