Snorkel MB20N-sn0001-0131 - Manual (Page 3)

Introduction
MB20N/MB26
DRIVE & STEER SYSTEM
An electronic controller, mounted in the chassis, is
pre-programmed to adjust the upper speed limits of
each individual function.
The controller limits the rotational speed of the
electric motor and oil pump, thereby limiting the
maximum oil flow rate.
The following functions are controlled and driven by
the electrohydraulic system:-
Traction Drives ( Fwd & Rev) masts stowed
Traction Drives ( Fwd & Rev) masts raised
Steering
Mast Elevation & Descent
Mast Rotation
Jib Elevation
The following functions are gravity operated and are
determined by built-in flow orifices:-
Jib Descent
POWER SYSTEM
The power system (prime mover) incorporates four
6V batteries driving a 4kW electrohydraulic pump.
The pump drives all hydraulic cylinders and the
traction drive motors. A single multi-valve control
block divert oil pressure to the actuators. The oil flow
rate is limited by the pre-programmed speed setting
on the motor but is determined by the position of the
joystick in the Upper Control Box.
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