Fayat Group BOMAG BW 900-50 Service Manual page 64

7.3
Hydraulic diagram
Fig. 3
Pos Designation
1 mechanical control
2 High pressure relief valves
3 Charge pressure relief valve
High pressure relief and charge pressure valve
High pressure relief valves with integrated boost check valves
Pressure peaks occurring during very fast swashing processes, as well as the maximum pressures are safe-
guarded by superordinate high pressure relief valves, which open when the adjusted value is exceeded and re-
lieve oil into the low pressure side. The fluid quantity always remains constant in the closed hydraulic circuit.
Leakages in pump and motor are compensated by the charge pump.
68
Pos Designation
A Work connection
B Work connection
M Motor
M Pressure test port, pressure A
a
M Pressure test port, pressure B
b
P Control pressure inlet
S
R Ventilation
S Pressure port for charge circuit
T Leak oil
1
T Leak oil
2
X X Port for control pressures, pressure in front of
1 2
nozzle
BOMAG
Travel pump, PMVO 13S
008 921 86