7.3
Travel pump, PMVO 13S
BOMAG
68
008 921 86
Hydraulic diagram
Fig. 3
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.
Pos
Designation
Pos
Designation
1
mechanical control
A
Work connection
2
High pressure relief valves
B
Work connection
3
Charge pressure relief valve
M
Motor
M
a
Pressure test port, pressure A
M
b
Pressure test port, pressure B
P
S
Control pressure inlet
R
Ventilation
S
Pressure port for charge circuit
T
1
Leak oil
T
2
Leak oil
X
1
X
2
Port for control pressures, pressure in front of
nozzle
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