Domestic Series 5000 Hydraulics
3
1.17. The process is reversed for right turns.
1.18. From the steering system, the fluid may follow
one of two return paths:
1.19. The fluid may pass through the T port, to the
return manifold. See Figure 1.19.
1.20. From the return manifold, the fluid may be
directed through the hydrostatic drive filter, to
provide charge pressure to the hydrostatic drive.
1.21. Pressure is maintained to the filter and hydro-
static drive by a spring loaded check valve. The
check valve in this application acts to maintain at
least 30 PSI (2.07 Bars) of hydraulic pressure in
the system. Above 30 PSI, it allows fluid to
return to the reservoir (transmission housing).
Figure 1.17
Steering cylinder
Pressure from R port
(right turn)
Pressure from L port
(left turn)
Figure 1.19
Fluid return
from T port
Fluid return from
lift valve
30 PSI
check
valve
Lift
valve
Charge
pressure
(30 PSI)
1.22. From the E port, fluid will travel to the lift control
1.23. The fluid pressure that comes out of the E port
goes to the outboard port of the lift control valve.
1.24. The lift control valve directs pressure to the sin-
gle-acting lift cylinder through the elbow on the
bottom of the valve when operator control input
directs it to do so. See Figure 1.24.
1.25. Fluid not required to power the lift cylinder will be
continuously directed back to the transmission
through the lower inboard port (forward facing
elbow) via the return manifold.
Figure 1.22
Pressure from E port
Figure 1.24
Pressure to lift
control valve
Pressure to
lift cylinder
Direct return
(on down-stroke)
Return via
return manifold
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