Charge pressure is a supply of oil to the hydrostatic pumps. Charge pressure is regulated by a charge relief valve located inside the hydrostatic pump. Charge pressure is used to replenish hydrostatic fluid removed from the drive circuit, pump and motor “internal leakage” and from the hydrostatic motors shuttle (flushing) valve.
Charge pressure is obtained from the standard section on the hydraulic gear pump.
Charge pressure is also used to operate other hydraulic functions, such as shifting the auxiliary spool in the main hydraulic control valve.
The charge pressure sender is located on the charge filter housing mounted next to the blower housing.
Charge pressure alarm settings are pre-programmed into the main controller and are based on loader type and options installed.