7.9
Travel circuit
BOMAG
80
008 921 86
7.9
Travel circuit
The travel circuit is a closed hydraulic circuit, it consists mainly of the travel pump
PMVO13S
with the integrated
safety elements, the travel motors and the check valve.
The travel pump has the function of supplying the travel circuit with hydraulic oil.
The travel motors are connected in series and drive the drum .
The gear pump flanged to the travel pump is responsible for vibration, steering and the charge circuit, the return
flow form the steering valve passes through the charge oil filter and the charge oil port on the travel pump.
The
filter
is equipped with a
bypass valve
. This valve opens at a pressure differential (pressure difference be-
tween filter inlet and filter outlet) of
Δ
p = 3.5 bar. This pressure differential depends on the filter contamination
and the viscosity of the hydraulic oil.
Fig. 1
The filter is equipped with a contamination indicator, the indicator pin of which pops out at a pressure differential
of
Δ
p = 2.5 bar.
462117
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