WORKSHOP MANUAL
PARK
Chapter
EDITION
2020
PAGE
41 /
124
4.1 THE STEERING SYSTEM
4.1.1 Description of the steering system
The PARK series machines are characterised by the division of the frame into two sections, front
and rear, connected to each other by a central articulated joint; for this reason, the steering wheel
does not act directly on the front wheels, but it activates a chain wheel that changes the alignment
between the axles of the front and rear of the machine, allowing
changes of direction.
The steering system uses an hydraulic steering valve, derived from
the rear transmission pump, which reduces the effort required for
the operation, as well as ensuring greater fluidity in driving and
when changing direction.
Since the steering valve is operated by the oil coming from the
pump, the engine should always be on and the machine should be
in motion when the steering is operated.
The machine can still be steered even with the engine off, requir-
ing, however, a greater effort to operate the steering wheel.
Summary
4.1 THE STEERING SYSTEM ...................................................................41
4.1.1 Description of the steering system ................................................41
4.1.2 Steering system problems and remedies ......................................42
4.2 STEERING SYSTEM INTERVENTIONS .............................................43
4.2.1 Disassembly of the chain and steering pinions .............................43
4.2.2 Replacement of the steering wheel pinion ....................................45
4.2.3 Replacement of the hydraulic steering valve (Booster) .................45
4 - STEERING
