Unimog U500, Инструкция по монтажу

Страница: 168 / 292

Body and Implement Mounting Guidelines U500 North America Mechanical drive of implements
August 2005 Page 171 of
294
Code Applications
N05
hydraulic pumps (shaft driven), generators, winches
N08
front mounted snow equipment, mower, wood chipper
N16 hydraulic pumps (directly mounted or via adapter)
N19
motor pumps (fire trucks), winches, generators
Table 5.2: Examples of PTO applications
The position of the power take-offs relative to the chassis coordi-
nates is the same for all U500NA. The dimensions can be deter-
mined from the CAD chassis drawings on the Unimog Resource CD.
Coordinates
x y z Code
[in] [mm] [in] [mm] [in] [mm]
N05 54.68 1,389 - 6.38 - 162 14.96 380
N08
- 38.74 -984 - 5.71 - 145 8.50 216
N16
97.29 2,471.2 0.93 23.65 0.36 9.2
N19
101.90 2,588.2 0.53 13.53 4.91 124.8
Table 5.3: Position of PTO´s N05 thru N19
5.6 Maximum available power output of the PTO’s
The maximum available power output can be approximately deter-
mined as follows:
•
Determination of the required PTO – speed and calculation
of the engine speed (e.g. PTO shaft speed: 1,000 rpm; ratio:
2.139; result: engine speed of 2,139 rpm).
•
Determination of the engine power output at this engine
speed from the engine power output diagram (Technical
Data book, see Unimog Resource CD).
•
Reduction of engine power output due to the driven auxilia-
ries (fans, hydraulic pumps, alternator, A/C compressor etc.).
•
Consideration of the drive train efficiency (approx. 90 – 95%).
Multiplication of the reduced engine power output with this
factor.
See also a calculation example in Section 5.9.2 Usable power output
of the power take-off shaft, page 177.
5.7 Engine controls and speed settings
Engine speed control
The Diesel engine OM 906 LA is equipped with an electronic engine
control system.
In normal driving mode, only the idling speed and max. speed is
controlled. With manual throttle setting applied and the auxiliary
power take-off engaged, the variable speed control is automatically
activated.
Variable speed control means that the engine speed is proportional
to the accelerator pedal setting in all engine load conditions. The
engine governor independently sets the injection volume from zero
up to maximum injection volume in order to maintain the specified
speed.
Intermediate speed limit
Max. governed engine speed settings for the auxiliary power take-
offs N16 and N19 can be ordered ex factory or can be programmed
into the engine ECU at authorized Freightliner Unimog dealers. The
following programmed governed speeds can be ordered ex factory:
•
Code W14; maximum engine speed of 1,400 rpm
•
Code W18; maximum engine speed of 1,800 rpm
Other W-codes and speeds are available, therefore see section 7.8
W code descriptions on page 235.
The speed limits are automatically activated when the power take-off
is switched on.
It is a standard feature that the engine speed, and thus the auxiliary
PTO – speed, can be adjusted via the cruise control to any setting
between low idle and max. governed speed.