New Holland CX720 Repair Manual page 2535

Motor Charge pressure relief valve - Check (C.20.F.28.10 - F.45.A.10)
NOTE: The motor charge pump relief valve is not adjustable.
1. To measure the motor charge pressure relief valve
(1) setting, install a 35 bar (500 psi) gauge in gauge
port (2). Start the combine. Engage the parking
brake, put transmission in fourth gear and the en-
gine at high idle. Apply pressure to the foot brake
and stroke the hydrostat lever.
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 motor charge pressure reading must be 18.1 bar
+/- 1.4(262 psi +/- 20). The gauge will read 21 bar
+/- 1.4 (302 psi +/- 20). This includes case pressure.
If the motor charge pressure is not within specifi-
cation, check the pump charge pressure and adjust
as previously described. Recheck the motor charge
pressure, and if it is still out of specification, replace
the relief valve.
POWER TRAIN - TRANSMISSION Hydrostatic
CAUTION
2 4/7/2006
C.20.F / 83
1
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