New Holland CX720 Repair Manual page 2525

Pump Charge pressure relief valve - Pressure setting (C.20.F.20.10 -
F.45.A.70)
1. To measure the pump charge pressure relief valve
setting, install a 35 bar (500 psi) gauge in port (1).
Start the combine and, with the hydrostatic transmis-
sion in neutral, record the pressure.
Block the front and rear wheels with suitable blocks
so the machine cannot move. Make sure everyone is
clear of the machine before starting the engine. Z010
2. The charge pump pressure reading should be 20.1 -
21.2 bar (291 - 308 psi). The gauge will read 22 - 23
bar (320 - 340 psi). This includes case pressure.
If the pump charge pressure is not within specifica-
tions, adjust the relief valve as follows:
3. Loosen the jam nut (2).
4. Turn the adjusting screw (3) clockwise to increase
the pressure and counterclockwise to decrease the
pressure.
5. When the charge pump relief valve setting is within
specifications, tighten the jam nut to 52 N·m (38 ft.
lbs.) and remove the gauge.
NOTE: The pressure will change at a rate of approximately
3.4 bar (50 psi) per turn.
POWER TRAIN - TRANSMISSION Hydrostatic
CAUTION
2 4/7/2006
C.20.F / 73
1
40013246_954