Section 22
Section 22
Hydraulic SystemHydraulic System
Steering LogicSteering Logic (Illustration 22-20 and 22-14)(Illustration 22-20 and 22-14)..
Hydraulic flow from the larger of the two gear setsHydraulic flow from the larger of the two gear sets
in the main pump enters the manifold at port P1.in the main pump enters the manifold at port P1.
Flow is then directed to the main relief valve (RV1)Flow is then directed to the main relief valve (RV1)
and the two steering logic controls (LC2 and LC3).and the two steering logic controls (LC2 and LC3).
If there is no demand from steering, LC2 sendsIf there is no demand from steering, LC2 sends
flow to the orbitrol until 150 psi (10.4 bar) standbyflow to the orbitrol until 150 psi (10.4 bar) standby
pressure can maintained in the line causing LC2pressure can maintained in the line causing LC2
to close. to close. The flow opens The flow opens LC3 and is LC3 and is then directedthen directed
to the hoist to the hoist and tilt valvand tilt valves. es. When steering, loadWhen steering, load
sense pressure builds from the orbitrol, whichsense pressure builds from the orbitrol, which
tank return from one outlet port to force fluidtank return from one outlet port to force fluid
through a hydraulic cooler located behind thethrough a hydraulic cooler located behind the
radiator. radiator. The check acts The check acts as a bypass as a bypass valve forvalve for
cold fluid startup as well as increased flow to tankcold fluid startup as well as increased flow to tank
as the mast is being lowered.as the mast is being lowered.
Brake / Brake Cooling LogicBrake / Brake Cooling Logic (Illustration 22-20)(Illustration 22-20)..
The auxiliary pump is a two section pump withThe auxiliary pump is a two section pump with
gear sets of gear sets of equal size. equal size. Flow from Flow from one gear setone gear set
enters the manifenters the manifold at port old at port P3. P3. Flow is Flow is blocked byblocked by
logic element (LC1) and must pass through orificelogic element (LC1) and must pass through orifice
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