New Holland CSX7000 Service Manual page 50

DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
Stack valve - Static description
The main hydraulic system will be a open centre load sensing system that controls all high pressure functions: All
header functions and unloading auger swing.
The hydraulic system contains one stack valve:
Main stack valve . (see also hydraulic schematic PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic schema
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(A.10.A)) Located at the left-hand side of the cab behind the steering platform.
The stack valve consists of two main parts.
Control valves for oil supply and load sensing (7 and 27)
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Refer to PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic schema (A.10.A)
Load sensing is a system which avoids high pressure when the valves are in neutral position and consequently,
less heating up of the oil and creating load-independent flow rate control.
Control valves with load sensing (13-15-17-21-28)
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Refer to PRIMARY HYDRAULIC POWER SYSTEM - Hydraulic schema (A.10.A).
13 Unloading tube movement
15 Reel vertical adjustment
17 Reel horizontal adjustment
21 Reversing system
28 Lateral float system
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