Hyundai HL955 Manual page 482

Cross-drilled hole (24) limits the maximum travel of control piston (10) to the left. The pump
supplies a sufficient amount of flow that compensates for system leakage. The pump also supplies
a sufficient of flow that compensates for leakage to the pump case. The leakage to the pump case
is a result of the cross-drilled hole. The pump maintains low pressure standby. Low pressure
standby pressure should not exceed 40 bar (580 psi).
※
Low pressure standby will vary in the same pump as the system leakage or the pump leakage
increases. The pump will upstroke slightly in order to compensate for the increasing leakage.
Control piston (10) will cover more of the cross-drilled hole.
6-18