Unimog U500, Инструкция по монтажу

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Body and Implement Mounting Guidelines U500 North America Hydraulic system
August 2005 Page 211 of
294
6.3 Information to the power hydraulic systems
Circuit Cell Symbol
Symbol
color
Pressure
line
Red
HS 20 screwed joint,
plug
Closed
Circuit
Separate
return
Red
HS 20 screwed joint,
socket
Pressure
line
Green
HS 20 screwed joint,
plug
Open
Circuit
Separate
return
Green
HS 20 screwed joint,
socket
Table 6.9 UNIMOG power hydraulic connections
Note: Care should be taken when connecting implements
to circuit 3 or 4 to ensure that implements cannot
be connected at the front (code H93 / H94) and the
side at the same time.
6.3.1 Power hydraulic flow rates
A constant capacity is often necessary for the operation of a
continuous consumer. This is why the Unimog has electrically
controlled variable displacement pumps for the power hydrau-
lic systems (circuit 3 and circuit 4). Before operating an imple-
ment the driver must adjust the necessary flow rate for the cor-
responding circuit on the hydraulic control unit in the cab. The
flow rate can be adjusted continuously variable between 0 and
the maximum capacity (circuit 3: 33.02 gal/min / 125 l/min; cir-
cuit 4: 23.78 gal/min / 90 l/min) in both circuits. It is controlled
independent of the engine speed in the context of basic val-
ues. If the engine speed is changed during operation, the flow
rate of the variable displacement pump remains constant. The
maximum flow rate is reached with engine speeds of approx.
1,800 rpm. Above 1,800 rpm the flow rate remains constant
(see Figure 6.14).
Figure 6.14: Flow rate over engine speed