Automatic Suspension - Hydraulic Fluid Leaks
Date: December 10, 2002Order No.: P-B-32.50/12
Supersedes:
Group: 32
SUBJECT:
Model 215
Model 220 and 230 with Active Body Control (ABC)
Hydraulic Oil Leakage at ABC System
If you encounter hydraulic oil leakage within the Active Body Control System (ABC) in the above models, perform the following procedure.
1) Identify the location of the leaking component.
2) Depressurize the ABC hydraulic system completely before starting any work on the system. Drain the hydraulic oil through the appropriate bleed screws shown in Figure 1 (front # 56, rear # 57). WIS document AH32.50-P-0001-01N. Wear protective clothing and eye protection. WIS document AS00.00-Z-0013-01A.
Note:
Wait for pressure relief in the ABC system. Pressure is relieved 10 minutes after the engine is shut down. Open bleed screw(s) carefully so that the hydraulic oil can drain out slowly in order to prevent the vehicle's body from dropping too rapidly.
3) Thoroughly clean the hydraulic line.
Note:
When working on the ABC system, the area around the oil pressure line connections and the components to be removed must be cleaned before commencing repair work.
4) Loosen the identified leaking hydraulic line.
5) Center and tighten the hydraulic line without tension.
Note:
It is only possible to ensure that the line connections are properly tightened when they are positioned tension-free. In order to ensure that the line is installed tension-free, tighten the nuts as far as possible by hand and then tighten to the specified torque with tool. Refer to torque specification chart.
6) Fill and bleed the ABC hydraulic system. WIS document AP32.50-P-0021 N.
7) Thoroughly clean the hydraulic line.
8) Connect STAR Diagnosis, and select the following menus; Control Units--> Chassis--> ABC active body control --> Actuations --> Cyclically Alternative Actuation Of All Suspension Struts In A Circular Motion Rodeo".
Note:
The Rodeo actuation is performed in order to heat the system up to operating temperature. Allow the vehicle to run in the Rodeo" program mode for a minimum of 5 minutes.
9) Perform a visual inspection of the hydraulic line.
10) If the system is still leaking replace the affected hydraulic line.
Note:
No residues such as swarf, lint, etc., must be allowed to enter the ABC system through the open oil pressure line connections.
11) Fill and bleed the ABC hydraulic system. WIS document AP32.50-P-0021N.
12) After line replacement, thoroughly clean the hydraulic line area.
13) Connect STAR Diagnosis, and select the following menus; Control Units --> Chassis --> ABC active body control --> Actuations --> Cyclically Alternative Actuation Of All Suspension Struts In A Circular Motion Rodeo".
14) Perform a visual inspection of the hydraulic line.
15) If after hydraulic line replacement the system continues to leak, replace the corresponding element for line connection (e.g. valve block, T-fitting).
16) Fill and bleed the ABC hydraulic system. WIS document AP32.50-P-0021N.
17) After component replacement, thoroughly clean the hydraulic line and component area.
18) Connect STAR Diagnosis, and select the following menus; Control Units --> Chassis --> ABC active body control --> Actuations --> Cyclically Alternative Actuation Of All Suspension Struts In A Circular Motion Rodeo".
19) Perform a complete visual inspection of the ABC hydraulic system.
TORQUE SPECIFICATION CHART
In Case of Warranty