Service Training Travel pump(s) The travel pump on the BW 145 D-3 is a swash plate actuated variable displacement axial piston pump from Hydromatik, type A10VG 63 HWD. The tandem pump unit used on the models BW 145 DH-3 / PDH-3 consists of two variable displacement axial piston pumps of the same type A10VG 28 HW. The pumps are fitted with all control and safety elements needed for operation in a closed hydraulic circuit. These are: • Servo control • High pressure relief valves with integrated boost check valves • Charge pressure relief valve • Pressure override
to the tank thermostat
Charge oil to brake valve
to cross-flushing drum drive
2 4 5 3
to/from travel motors
6
1
8
7
6 5 from/to travel motors
Charge oil from filter
Fig. 3 Hydraulic diagram travel pump BW 145 D-3(DH/PDH: Tandem pump of identical design) 1
Variable displacement pump
2
Servo valve (mech. control)
3
Control piston
6
Feedback lever
5
High pressure relief valves
6
Boost check valves
7
Pressure override
8
Charge pressure relief valve
BW 145 D-3 / DH-3 / PDH-3
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