Raising/lowering the vehicle frame manually, function

W32.33-1014-09

All models except 375, 944, 957, 950.5/6,

954.5

1 Raise/lower front indicator lamp

2 Raise/lower rear indicator lamp

3 Raise/lower front On/Off key

4 Raise/lower rear On/Off key

5 Frame height M1 key

7 Driving position key

8 Raise key

9 Lower key

B51 Front axle position sensor

B52 Left driven axle position sensor

B53 Right driven axle position sensor

S50 NR/ENR operating unit

Y26 NR/ENR front axle solenoid valve

Y27 NR/ENR valve block (4x2 or 6x4)

Y28 NR/ENR valve block (6x2 or 6x2/4)

10 Stop key

11 NR/ENR display field

11.1 "Vehicle frame above normal level" indicator

11.2 "Vehicle level below normal level" indicator

A14.1 NR/ENR control unit

A14.2 WR control unit

W32.33-1034-09

Models 375, 944, 950.5/6, 954.5

1 Raise/lower front indicator lamp

2 Raise/lower rear indicator lamp

3 Raise/lower front On/Off key

4 Raise/lower rear On/Off key

5 Frame height M1 key

7 Driving position key

8 Raise key

9 Lower key

B52 Left driven axle position sensor

B53 Right driven axle position sensor

S50 NR/ENR operating unit

Y26 NR/ENR front axle solenoid valve

Y27 NR/ENR valve block (4x2 or 6x4)

Y28 NR/ENR valve block (6x2 or 6x2/4)

10 Stop key

11 NR/ENR display field

11.1 "Vehicle frame above normal level" indicator

11.2 "Vehicle level below normal level" indicator

A14.1 NR/ENR control unit

B51 Front axle position sensor

W32.33-1021-09

Model 957

1 Raise/lower front indicator lamp

2 Raise/lower rear indicator lamp

3 Raise/lower front On/Off key

4 Raise/lower rear On/Off key

5 Frame height M1 key

6 Frame height M2 key

7 Driving position key

8 Raise key

B51 Front axle position sensor

B52 Left driven axle position sensor

B53 Right driven axle position sensor

S50 NR/ENR operating unit

Y26 NR/ENR front axle solenoid valve

Y27 NR/ENR valve block (4x2 or 6x4)

Y28 NR/ENR valve block (6x2 or 6x2/4)

9 Lower key

10 Stop key

11 NR/ENR display field

11.1 "Vehicle frame above normal level" indicator

11.2 "Vehicle level below normal level" indicator

A14.1 NR/ENR control unit

Function

Activate NR/ENR operating unit and raise or lower the vehicle frame

1 Basic condition:

 Ignition "on"

2 Activate the NR/ENR operating unit (S50) by pressing the raise/lower front and/or rear On/Off key (3 and/or 4).

3 The raise/lower front and/or rear indicator lamp (1 and/or 2) lights up to indicate that operating unit is ready.

 If the vehicle is equipped with full air suspension, the vehicle frame can be raised or lowered separately at the front and rear by pressing the appropriate key (3 or 4). If the driver presses both keys, the front and rear of the vehicle frame can be raised or lowered simultaneously. If the vehicle is not equipped with full air suspension, the raise/lower front key and indicator lamp (1 and 3) do not operate.

4 Change the height of the vehicle frame using the raise and lower key (8 or 9).

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 The vehicle frame can only be raised or lowered using keys (8 or 9) if the vehicle speed is < 30 km/h.

5 The NR/ENR or WR control unit (A14.1 or A14.2) receives signals from the NR/ENR operating unit and actuates the NR/ENR valve block (Y27/Y28) at the driven axle and/or the NR/ENR solenoid valve (Y26) at the front axle.

6 The valve block and/or the solenoid valve pressurize or vent the air bellows at the driven axle and/or front axle according to the command from the control unit. The vehicle frame is raised or lowered.

7 The "vehicle frame above or below normal level" indicator (11.1 or 11.2) lights up in the NR/ENR display field (11).

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8 The position sensors (B52 and B53) at the driven axle and/or the position sensor (B51) at the front axle monitor the changes in the frame height for the control unit (A14.1).

 The control unit interrupts the raising or lowing process as soon as the signals from the position sensors indicate that the upper or lower frame height limit of the vehicle frame has been reached. The vehicle frame then remains in the maximum upper or lower frame position.

Raise or lower the vehicle frame using the stop key

1 The driver can press the stop key (10) to end the raising or lowering procedure immediately in all frame positions.

2 When the driver presses the stop key the control unit (A14.1) deactivates the NR/ENR valve block (Y27/Y28) at the driven axle and/or the NR/ENR solenoid valve (Y26) at the front axle. The air bellows are no longer pressurized or vented.

3 The control unit adopts the current frame height as the specified level with a delay of 4 seconds.

 The stop function is available at all vehicle speeds.

Deactivate the NR/ENR operating unit by returning to the normal level (driving position)

1 The vehicle frame is set to any height.

2 The NR/ENR operating unit is deactivated if the driver presses the driving position key (7). The raise/lower front and/or rear indicator lamp (1 and/or 2) extinguishes on the NR/ENR operating unit (S50).

3 The control unit (A14.1) actuates the NR/ENR valve block (Y27/Y28) at the driven axle and/or the NR/ENR solenoid valve (Y26) at the front axle so that they either pressurize or vent the air bellows depending on the position of the vehicle frame.

4 The vehicle frame is raised or lowered to the normal level (starting position).

5 The position sensors (B52 and B53) at the driven axle and/or the position sensor (B51) at the front axle monitor the position of the vehicle frame.

6 The control unit (A14.1) deactivates the NR/ENR valve block (Y27/Y28) and/or the NR/ENR (Y26) solenoid valve as soon as it receives signals from the position sensors indicating that the normal vehicle level as been reached .

7 The "vehicle frame above or below normal level" (11.1 or 11.2) indicator in the NR/ENR display field (11) extinguishes.