Carefully read personal and machine SAFETY PRECAUTIONS at the beginning of this Manual
GENERALITIES1850K 0 - 13
The machine uses a differential steering system; this consists of a hydraulic pump, a hydraulic
motor, controls, two planetary modules and a steering gear train.
The rear transmission has two power inlets. One from the bevel gear for the speed and Forward
reverse, the other from the motor, to turn.
The steering system is actuated by a pilot valve located on the left side of the driver's compart-
ment.
The levers send an electric signal to the microprocessor controlling the two proportional sole-
noid valves; these valves convert the electric signal into a hydraulic one, piloting the steering
section of the main valve.
This section controls the pump flow to the hydraulic motor that through the steering gear train,
actuates the two planetary modules and the right track chain.
The open hydrostatic circuit includes:
- main pump
the same of the equipment (see hydraulic system) cm
3
/rev 130
- hydraulic motor
Bent axis design, axial pistons, fixed displacement motor
(with bolt-on movement control valve)
Displacement cm
3
/rev 90
Max. operating pressure bar (psi) 350 (5076)
- Steering control valve
Closed centre. This section is included in the implement control valve
- Steering control
Electro-Hydraulic control with two proportional valves
Integrated CPU for steering and TM control
- Priority valve
It provides priority to the steering over the equipment control
(blade raising)
- Make-up valve
It provides pressure to both equipment control pilot valves
and to the proportional solenoid valves bar (psi) 30 (435.1)
- Oil radiator
Aluminum body mm (in) 590x179x63 (23.2x7x2.5)
By-pass setting bar (psi) 5 (72.5)
Planetary modules
See "power train" diagram.
Gear ratio
straight travel conditions - 1.44
Steering line
See "power train" diagram
Gear ratio
Hydraulic motor to sprocket - 1.92
TECHNICAL DATA 1850K
STEERING
SYSTEM
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