Pressure Reservoir Test

CHECKING PRESSURE RESERVOIR

Data
Gas filling pressure of pressure reservoir:
When new: 23 ± 1 bar
min. value: 15 bar

Note: Inspection jobs require the following components of tester:





Pressure gauge (0-250 bar gauge pressure) with connection, coupling nut with sealing ring (038a), transfer connection (c), test hose (d), couplings (f), test line (g), and (I), bleed screws (n) and distributor (r). Screw only one bleed screw (n) into distributor (r).

Checkup of pressure reservoirs includes gas filling pressure and can be made on operational vehicle only, similar to pressure oil pump and to level controller.

Insufficient gas filling pressure results in an abnormal pressure increase during deflection. This will be noticed by a considerable hardening of the suspension system and may very well result in damage to suspension elements. In addition, hardening of suspension may lead to a reduction of the damping force of the spring struts, which in turn will result in an increased tendency toward rolling and toward rocking of vehicle when driving around alternating bends.

Checkup





1 Disconnect connecting rod (7) on level controller (3).





2 Set lever of level controller to "L" (emptying).





3 Plug oil drain hose (061) on bleed screw (11a) on level controller. Open bleed screw slowly and discharge pressure.

4 Remove bleed screw (11a) on level controller or on distributor.





5 Connect pressure tester (038) with pressure hose (038d) to level controller or distributor.





6 Disconnect pressure line (B2) on lefthand and righthand pressure reservoir (4). Close both pressure lines each time with coupling (038f) and bleed screw (038n).

Checking Righthand Pressure Reservoir





7 Connect test hose (038d) of pressure tester to righthand pressure reservoir.





8 Set lever of level controller to "L" (emptying).

9 Run engine at idle. Set lever of level controller to "F" (filling), while paying attention to needle of pressure gauge.

10 The gas filling pressure of pressure reservoir is indicated when the needle of the pressure gauge rises continuously to a pressure value. This sudden rise is effected by the oil pressure as soon as the oil pressure exceeds the gas pressure. Set lever of level controller to "L" (emptying). Stop engine.





11 Plug oil drain hose (061) on bleed screw (038n). Open bleed screw slowly and discharge pressure. Catch the oil in a clean vessel.

Checking Lefthand Pressure Reservoir

12 Connect test hose with lefthand pressure reservoir. Then perform jobs according to items 9 and 10.

13 Disconnect pressure tester. Mount bleed screw. Connect pressure lines to pressure reservoirs.





14 Fill caught oil through filling funnel (60) into fluid reservoir (2) in the engine compartment.

Attention! Reuse only clean oil.

15 Fill pressure oil system. Run engine at medium speed while setting lever of level controller for 30 seconds in position "F" (filling).





16 Mount connecting rod for level controller.





17 Check oil level in fluid reservoir (2) with engine stopped and correct, if required. In operational system and ready-for-driving condition the oil level should be between the marks "max." (a) and "min." (b). On loaded vehicle, an oil level at "min." mark will result.