New Holland T7030 Service Manual page 30

DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Static description
The hydraulic system comprises the following oil circuits:-
High pressure circuit
Hydraulic rear powerlift
Remote valves
Trailer brake system (where fitted)
Front axle suspension (where fitted)
Oil circuit of the steering hydraulics
Steering pump and steering cylinder
Control valve of the Fast Steer (where fitted)
Low pressure circuit
Engine PTO
Differential lock
All wheel drive
Actuation of transmission couplings and synchroniser units
Front axle servobrake
Engagement of the crawler gear
Servo-actuated main brake cylinder
Front PTO (where fitted)
Layout of the lubrication system
PTO coupling
Transmission coupling
Transmission shaft pressure lubrication
Bearing of the pump drive pinion
Lifting shaft of the hydraulic powerlift
The high pressure circuit is a closed Load Sensing system and is configured differently according to the variants in
equipment for each tractor model.
Steering circuit, low pressure and lubrication circuits are an open system, in models with SuperSteer front axle the
steering circuit is however configured as dynamic Load Sensing hydraulics.
VARIATIONS IN EQUIPMENT IN THE TRACTOR HYDRAULICS
Transmission
Power Command
transmission
High pressure
hydraulic system
Closed system
Hydraulic pump
120 L/min CCLS
variable displacement
pump
150 L/min "Hi Flow"
axial piston variable
displacement pump
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Hydraulic powerlift
Electronic powerlift
control
Remote valves
Closed system