3.22 Auxiliary Drives

Power output of the engine via v-belts
At the engine, the output can be decreased by max. 10 kW via v-belts, if the available flange points are being used.

Versions available ex works:

  • Power steering pump/steering booster pump, standard

optional:

  • 2. Generator, 90 A (PR-No. 8HB)
  • Refrigerant compressor (PR-No. 2AB), operative compressor installed in the vehicle, Sanden SD7 H 15 (non-controlled)

  • Hydraulic pump as enclosed package (PR-No. 2BD) preparation for installation

At backfitting of a refrigerant compressor it is important to order the preparation refrigerant compressor (PR-No. 2AC). Otherwise you have to assemble the original parts. Differing parts can cause damages (for example, fracture of the clamping element).



Auxiliary drive of standard transmission
Actuation is realised via the countershaft of the transmission

Versions available ex works:

Module

PR-Number


ZSB

Transmission without auxiliary drive, standard

0R0


ZSB

Transmission with auxiliary drive
Countershaft without flange

0R1


ZSB

Transmission with auxiliary drive
Countershaft with flange

0R3


ZSB

Transmission with auxiliary drive
Switch lock for transmission
Countershaft without flange

0R6


ZSB

Transmission with auxiliary drive
Switch lock for transmission
Countershaft with flange

0R7


Power take-offs are not available for 2,5l diesel TDI(61kW).

The electronical engine speed govemor (PR-No. 6Y3, 6Y6) is only available for power take-offs (PR-No. 0R6, 0R7).



Notes:

  • The design of the auxiliary drive and the selection of the gear ratio depend on the power and speed (revolutions per minute) of the modules to be actuated.
  • Transmission-dependent auxiliary drives may only be switched on/off with the vehicle standing still.
  • Information on max. transmissible torques (Nm) of the individual auxiliary drives can be taken as guide values for shock-free and non-oscillating operation. According to DIN 922, the above specifications are based on a fatigue-limited gearing layout and a calculated service life of 500 hours. Additionally occurring inertia forces at the modules to be actuated are not considered.
  • The gear ratio of the auxiliary drive has to be selected in such a way, that the minimum speed (engine), i. e. between 1,000 rpm and 1,200 rpm, is not exceeded if the auxiliary drive is loaded. The output decrease should lie within the range of the maximum engine torque.
  • Exposed drive shafts, fan rotors or belt pulleys must be covered.
  • It is not permitted to attach belts or chain drives to the drive shaft or flange of the auxiliary drive. However, if exceptions from the above specifications cannot be avoided, the appropriate drawings and data must be submitted for approval.


Dimensions - clutch flange - Auxiliary drive



a ø

b ø

c ø

d ø

e ø

f ø

Number of holes


90

74,5

47e8

6

2.1

8,0B12

6

Technical data/information - auxiliary drive

  • Max. torque decrease for shock-free and non-oscillating operation: Md = 200 Nm

  • Continuous power at engine speed 2,500 rpm: Nmax = 20 kW
    (max. 40 kW, for short time: approx. 3 minutes)

  • Continuous power with engine cooling system with heavy-duty fan and radiator (PR-No. 8Z2): Nmax = 30 kW (max. 40 kW, for short time: approx. 3 minutes)

  • Drive speed at auxiliary drive
    MNA = 0,775 x nMot

 

 

I

II

III

IV

V

VI

VII

A1

B1

C1


2,5 l TDI
2,8 l TDI

G 28-5

0R3/0R7
0R1/0R6

0,775
0,775

20/2500
20/2500

200
200

a
a

639
745

131
127

100,6
100,6


 
Additional information on table "Auxiliary drives":

I

II

Transmission

III

Designation of auxiliary drive

IV

Drive speed (rpm)
at auxiliary drive nNA = iNA x nMotor

V

Continuous power at auxiliary drive

VI

Max. torque decrease at
auxiliary drive in Nm

VII

Direction of rotation seen in driving direction
a) anti-clockwise

A1

Distance between rear edge of clutch flange and middle of front axle

B1

Distance between middle of clutch flange and top edge of chassis frame

C1

Distance between middle of clutch flange and middle of transmission flange



Note: Subject to errors and technical amendments. The electronic version of the body guidelines is the decisive source of up-to-date data on body guidelines.August 2007

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