SUPPLEMENTAL STEERING SYSTEM
apart from the primary system oil by three check valves
PRESSURE SENSING SWITCH
With the Auto/Manual switch in the automatic
AUTO/MANUAL SUPPLEMENTAL STEERING SWITCH
17 .Switch (auto position)
position, pressure sensing switch (14) in the primary
hydraulic system senses when hydraulic pressure has
been lost or is below the minimum acceptable level. The
sensing switch (14) electrically tells the supplemental
steering electronic control module that there is a loss of
pressure. The control then turns on electric motor (6).
This motor (6) drives hydraulic pump (8) for
HYDRAULIC OIL TANK
SUPPLEMENTAL STEERING MOTOR AND PUMP
6. Motor. 8. Pump.
The machine's batteries must have a normal charge and
the supplemental steering electrical system must have
correct operation. A low charge condition, or any defect
in the battery, battery cells, or electrical circuit can cause
loss of supplemental steering and could result in
personal injury and/or damage to the machine.
CHECK VALVE (AT COMBINATION VALVE)
The supplemental steering system is also manually
13. Check valve (at combination valve). Check valve (at
activated by keeping the spring loaded Automatic/Manual
relief valve - not shown). Check valve (at bracket under
switch (17) in the Manual position. This is used to turn
floor plate - not shown).
the wheels while testing the system.
The supplemental steering pump (gear type) (8),
When turning the steering wheel (7), steering
pumps oil from hydraulic tank (3) to steering metering
metering valve (9) sends hydraulic oil (10) to the
valve (9). The supplemental steering oil is kept
respective head and rod ends of the steering cylinders.