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2014-09-20 Workshop Manual, GGP Park 4 Hydraulic system 11
Charge pump
The charge pump has two tasks:
• To feed the external hydraulic with 35-45 bar.
• To feed the main pump with its initial pres-
sure, 1,5-2,5 bar.
External hydraulic
The charge pump (1) sucks oil from the oil
container (5).
When the external hydraulics are in use, the
pressure in the out line (3) is limited to 35-45
bar by the pressure valve (4).
Without external hydraulic
The connections for the external hydraulics are
connected to each other. Compare the two
figures.
The charge pump (1) sucs oil from the oil
container (5).
The pressure valve (4) has no function because
the pressure valve (7) is set to a much lower
pressure (see below).
Feeding the main pump
The line (2) feeds oil to the main pump
respective suction lines (depending on driving
forwards or backwards) through the respective
back valves (6). The pressure in the line (2) is
limited to 1,5-2,5 bar by the pressure valve (7).
6
6
5
2
4
3
1
7
With external hydraulic
4
7
6
6
5
2
4
3
1
7
Without external hydraulic
1.5-2.5 bar
35-45 bar
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