Hydrostatic System Oil Flow - New Holland LS140 Workshop Manual

HYDROSTATIC SYSTEM OIL FLOW

Hydrostatic Pumps and Motors High-Pressure
Flow
The hydrostatic pumps are driven by the engine
through a flex plate drive coupler.
The rear hydrostatic pump, 1, supplies high-pressure
oil through high-pressure lines, 2, to the left hydro-
static motor, 3, when the left forward/reverse control
lever is stroked in either direction.
The front hydrostatic pump, 4, supplies high-pres-
sure oil through high-pressure lines, 5, to the right hy-
SECTION 29 - HYDROSTATIC TRANSMISSION
5
2
29-11
6
5
4 1
2
3
drostatic motor, 6, when the right forward/reverse
control lever is stroked in either direction.
The hydrostatic system is protected by four high-
pressure relief valves, two in each pump, one for for-
ward and one for reverse. All four high-pressure relief
valves are the same and factory set at 306 bar (4500
PSI). Do not try changing the pressure setting of
these relief valves. If during testing the relief valves
are found to be incorrectly set, replace the complete
valve cartridge.
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