New Holland WorkMaster 50 Service Manual page 422

Main lift system - Inspect
The pre selector (P) is used to connect the auxiliary
port-thread M18 x 1.5 and send the oil to a single acting
cylinder-for example a wagon dump-and moving it with
the draft lever (2).
In this way the oil that normally is filling the rock-shaft
cylinder is deviated to the external cylinder.
• Connect the port (PA) to the single acting usage e.g.
Wagon dump cylinder.
• For safety fully lower the lift arms by putting down
both draft and position levers.
• Screw completely the pre selector (P) in order to
block the oil passage to the rock shaft cylinder.
• To obtain the acting of external cylinder move up
slowly the draft lever (2). If the top link bracket is
in neutral position (without any implement attached)
the effect starts when the lever (2) is between num-
bers 9-6 on the sector.
• To obtain the stop of the acting move back down a
little the draft lever.
• To obtain the discharge - cylinder closing - lower
down fully the draft lever (2).
NOTE: In the acting phase-external cylinder opening-if the
single acting arrives to the end of the stroke the relief valve
enters in action with the possibility to damage the pump if
the system is left for a long time in this position.
Hydraulic systems - Main lift system
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