Adjusting Control Point on Rear Axle
Adjusting Control Point on Rear Axle
Preliminary operations:
Mounting of wheels.
Checking and adjusting vehicle level at front and rear axles.
Oil level:
check and correct in oil reservoir for level control.
Level measuring instrument (02) 201 589 O1 21 OO:
position at inner pivot point of spring link (6) and measure control point with feeler arm at rear axle shaft (11).
Vehicle rear end:
load with weights or pull down with pulling device 201 589 11 31 00 to specified control point (observe notes)
4 mm adjustment pin (015):
insert into bore "a" in level control adjustment lever. If adjustment is correct, the adjustment pin can be inserted into the locating bore in the level control.
Connecting rod (55a)
correct if adjustment is not correct. For this purpose loosen both contact nuts and shorten or lengthen the connecting rod with the adjustment screw until the lever on the level controller (3a) can be located with the 4 mm adjustment pin on the level controller (bore "a").
4 mm adjustment pin on level controller:
pull out.
Vehicle rear end:
relieve.
Adjustment of headlights:
check, correct if required.
Basic Version
Special Tools
Equipment (shop-made)
Weights for loading vehicle
2 x 5kg
5 x 10kg
5 x 20kg
Note
The level control on the rear axle consists of a hydropneumatic auxiliary suspension system, which is automatically activated when the rear suspension is compressed a specific distance. On sedans, for example, the level control is activated when the vehicle is loaded with two passengers seated in back or approx. 40 kg (88 lb.) of luggage in the trunk. In all cases the control point for the loaded vehicle is the level corresponding to the design position for the vehicle model in question.
For proper function of the level control as well as for comfort and optimum handling, the vehicle level be adjusted according to specifications in the ready-to-drive state as well as when loaded.
In the ready-to-drive state the rear end of the vehicle is supported only by the rear springs and the basic pressure in the suspension elements. The basic pressure is maintained by the pressure release valve in the level control regardless of the position of the lever.
Caution!
If the rear end is too low in the ready-to-drive state never attempt to adjust to a higher level by readjusting the level control connecting rod.
This would result in the level being continuously too high under load. The results would be poor handling, oil flow and knocking noises when the suspension bottoms out as well as the trailer hitch being considerably too high for operation with a trailer.
Moreover at high loads or when accelerating the maximum pressure limited by the level control in the suspension elements would be reached so that in these vehicle states the opening noise could be heard continuously as a whistling and knocking noise. If the level is too low in the ready-to-drive state, correct at the rear springs. However the prerequisite for evaluation of the level in the ready-to-drive state is that the full basic pressure is present in the suspension elements.
Pull vehicle rear end down with pulling device 201 58911 31 00
Vehicles without trailer hitch
Hook pulling device (040b) with mounting bolts (040a) onto rear mount for rear axle carrier and lock in place (arrows). Attach lower cross member (040c) with pulling spindle (040d) to pit or lifting platform.
Vehicles with trailer hitch
Hook pulling device to trailer hitch with two additional chains (041) through inner eyes in trailer hitch. Attach lower cross member (040c) with pulling spindle (040d) to pit or lifting platform.