F-28. SUSPENSION LOCKOUT HYDRAULIC SUBSYSTEM.
The suspension lockout hydraulic
one side of the cylinder piston to the other.
The pressure switch (8) is closed when
subsystem forms a hydrostatic lock within
pressure in the lockout cylinder is over 120
each lockout cylinder (3). This stops up and
psi (827 kPa), lighting the SUSPENSION
down movement of the road wheels
provides a solid hoisting platform.
lic pressure drops below 95 psi (655 kPa),
the pressure switch (8) opens, putting out
b. Lockout cylinders (3) are locked by
the SUSPENSION LOCKED indicator lights.
setting the selector control valve (5) to
LOCKED. Hydraulic fluid at 1600 to 2400
c. T h e
psi (11,032 to 16,548 kPa) flows through
the valve (5) to the valve (6). The valve (6)
overpressure by the relief valve (2), which
bypasses fluid over 240 psi (1655 kPa)
reduces the fluid pressure to 150 psi (1034
kPa). As the fluid pressure builds up in the
back to the
reservoir. The cylinders (3) are
setting the valve (5) to
lockout cylinders (3), the lockout pistons
This allows the hydraulic fluid
are forced into the lockout position. This
to flow back
to the reservoir.
prevents hydraulic fluid from passing from