B Safety – Safety instructions 5 page Hydraulic and brake systems, depressurizing 1 Machine in service position. 2 Depressurize the hydraulic system. Turn the start key to position I and activate extension out, a dis- tinct hissing sound is heard if there is pressure in the hydraulic system. Activate lift, extension and sideshift several times. 3 Turn the start key to position 0 and turn off the main electric power. 4 Depressurize the attachment. Open the relief valve top lift. 002269 The above illustration shows closed valve. UDRF01.04GB Maintenance manual DRF 400–450