Variable Displacement Pump - General Specification; Charge Pump - New Holland T7.170 Service Manual

HYDRAULIC, PNEUMATIC, ELECTRICAL, ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM
Hydraulic pump Variable displacement pump - General specification
Variable displacement pump
Type
Rotation
Pump speed @ engine speed 2400 RPM maximum rated
speed (Theoretical)
Pump speed @ engine speed 2200 RPM
Output @ engine speed 2200 RPM (Standard flow)
Output @ engine speed 2200 RPM(High flow)
Piston Pump displacement (Standard flow)
Piston Pump displacement (High flow)
Low Standby Pressure
Low Standby Pressure (with Italian trailer brakes)
High Standby Pressure
Maximum system pressure
Cooler By Pass valve

Charge Pump

Type
Charge Pump displacement
Output @ engine speed 2200 RPM Standard flow
Output @ engine speed 2200 RPM Hi flow
Charge pressure filter dump valve :
Crack open
Fully open
Charge pressure
Charge pressure switch closes
Variable Displacement Closed Centre
Load Sensing Piston Pump
Clockwise
3000 RPM
2750 RPM
125 l/min (33.0 US gpm)
140 l/min (37.0 US gpm)
56 cm³/rev
63 cm³/rev
26 bar (377.0 psi) ± 1 bar (14.5 psi)
36 bar (522.0 psi)
210 bar (3045.00 psi) ± 5 bar (72.5 psi)
245 bar (3552.5 psi)± 5 bar (72.5 psi)
5.8 bar (84.1 psi).
Internal rotor gear pump
74 cm³/rev Standard flow
82 cm³/rev High flow
200 l/min (52.8 US gpm)
225 l/min (59.4 US gpm)
10 bar (145.0 psi)
15 bar (217.5 psi)
2 - 4 bar (29.0 - 58.0 psi)
1 bar (14.5 psi)
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