New Holland LS140 Workshop Manual page 157

Hydrostatic Pump and Motor Charge Pressure
Oil Flow
During the operation of the hydrostatic pumps and
motors, oil from the high-pressure system is used for
lubrication of the internal rotating parts of the pumps
and motors. The lubrication oil drains into the pump
and motor housings.
SECTION 29 - HYDROSTATIC TRANSMISSION
3
29-12
3
A charge check valve in the return line after the filter
at 1, builds back pressure in the return circuit and
forces oil through the charge line, 2, into the hydro-
static pump back plates at 3. This charge oil provides
replacement oil in the high-pressure circuits that was
used for lubrication purposes.
Copyright © New Holland
1
2
9