New Holland CX720 Repair Manual page 2475

Pressure Limiter 8b - 9b
When high pressure exceeds 420 bar (6090 psi), poppet (D), will move to the left, compressing spring (E), due to
the pressure behind the poppet pressurized oil will flow from port (X), into port (Z), to the main servo cylinder. The
main servo cylinder will then move the swash plate of the hydrostatic pump towards neutral when the transmission is
in drive mode and towards maximum displacement when the transmission is in brake mode.
POWER TRAIN - TRANSMISSION Hydrostatic
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