Wacker Neuson Telehandler TH412 Operator's Manual page 212

Operation
5 Operation
Return without pressure
Fig. 104
Some attachments require a return without pressure. The
connection for the reverse travel without pressure is
located at the front left on the mast. The design of the
connection makes it impossible to confuse it with the
normal connections of the additional hydraulics.
5-86
BA TH412 * 06/2017 * 4512_5-13_2_Opt_Hydr_en.fm