Mercedes-Benz S-Class - Power window system on S-Guard vehicles with code Z07 | W221
This S-Class is not a normal series production vehicle, it is actually an armored special protection vehicle. Due to the large weight of the side windows ... ... electric power windows are not installed, hydraulic power windows are installed instead. On this S-Guard, there is a problem with the power window system. When the vehicle is parked, a window lowers slightly after several hours idle time. First check this complaint in the workshop. Close all windows. Allow vehicle to stand with the engine off for 4 to 5 hours. Then check the position of the windows. There is a clear gap on one of the windows. The cause is presumably a leak in the emergency valve block of the hydraulic power window on the door. Remove the mechanical key and store it outside the vehicle. Be careful not to lock yourself out of Guard vehicles. Close window. Switch ignition off again. Check whether both levers of the emergency operation function are closed correctly. This is the case here and the system has not been operated incorrectly. For safety reasons, depressurize the system. Operate the emergency opening/closing function until there is no longer any pressure and the window comes to a standstill. Continue troubleshooting by performing basic adjustment of the emergency levers to the valve shaft. Remove the door trim as described in WIS. Remove the retaining ring shown here. Unhook the spring. Use an open end wrench to hold the "emergency opening" valve shaft. Loosen the locknut. Detach the nut, washers and lever. Check whether the opening valve is closed correctly. Note: It is a right-hand thread. The "emergency opening" valve shaft can be turned further in the closing direction. The system is thus not leaktight here. Close the valve shaft fully with 7 Nm. Continue adjusting the basic setting. Apply Loctite 270 thread lock to the thread. Install the lever including washers. Screw locknut on the valve shaft. Tighten the nut until the lever is seated firmly. Fix the position of the valve shaft using an open end wrench. Use a feeler gauge to adjust the distance between lever and stop plate to 1.6 mm. When the dimension is set correctly, tighten locknut to 11 Nm. Check the set dimension again by way of precaution. Also perform basic adjustment on the upper lever. Note: The upper valve shaft is a left-hand thread. Note: The rotation directions of the valve shafts are the other way around on the passenger side. The upper lever has a right-hand thread, the lower lever a left-hand thread. Apart from the rotation directions, basic adjustment of the emergency valves works the same everywhere. When correctly adjusted, hook in the spring and reattach the retaining ring. Check the emergency operation function of the power windows for proper operation. Be sure to close the levers correctly after actuation. The spring provides assistance and does not return the lever back to its position fully. Switch on the ignition. Perform a function check of the power window using the electric switch on the driver door. The window opens and closes properly. Reinstall the door trim. Charge the pressure reservoir of the hydraulic pump. To do so, hold down the operating switch for 10 seconds. Perform a final quick test with Star Diagnosis. Reinsert the mechanical key into the main key. Allow vehicle to stand for 4 to 5 hours again. Finally, check whether the window has opened again. That is not the case. The problem is thus eliminated. =========================================================== instagram: https://www.instagram.com/mbownersclub/ twitter: https://twitter.com/MB_Owners
This S-Class is not a normal series production vehicle, it is actually an armored special protection vehicle. Due to the large weight of the side windows ... ... electric power windows are not installed, hydraulic power windows are installed instead. On this S-Guard, there is a problem with the power window system. When the vehicle is parked, a window lowers slightly after several hours idle time. First check this complaint in the workshop. Close all windows. Allow vehicle to stand with the engine off for 4 to 5 hours. Then check the position of the windows. There is a clear gap on one of the windows. The cause is presumably a leak in the emergency valve block of the hydraulic power window on the door. Remove the mechanical key and store it outside the vehicle. Be careful not to lock yourself out of Guard vehicles. Close window. Switch ignition off again. Check whether both levers of the emergency operation function are closed correctly. This is the case here and the system has not been operated incorrectly. For safety reasons, depressurize the system. Operate the emergency opening/closing function until there is no longer any pressure and the window comes to a standstill. Continue troubleshooting by performing basic adjustment of the emergency levers to the valve shaft. Remove the door trim as described in WIS. Remove the retaining ring shown here. Unhook the spring. Use an open end wrench to hold the "emergency opening" valve shaft. Loosen the locknut. Detach the nut, washers and lever. Check whether the opening valve is closed correctly. Note: It is a right-hand thread. The "emergency opening" valve shaft can be turned further in the closing direction. The system is thus not leaktight here. Close the valve shaft fully with 7 Nm. Continue adjusting the basic setting. Apply Loctite 270 thread lock to the thread. Install the lever including washers. Screw locknut on the valve shaft. Tighten the nut until the lever is seated firmly. Fix the position of the valve shaft using an open end wrench. Use a feeler gauge to adjust the distance between lever and stop plate to 1.6 mm. When the dimension is set correctly, tighten locknut to 11 Nm. Check the set dimension again by way of precaution. Also perform basic adjustment on the upper lever. Note: The upper valve shaft is a left-hand thread. Note: The rotation directions of the valve shafts are the other way around on the passenger side. The upper lever has a right-hand thread, the lower lever a left-hand thread. Apart from the rotation directions, basic adjustment of the emergency valves works the same everywhere. When correctly adjusted, hook in the spring and reattach the retaining ring. Check the emergency operation function of the power windows for proper operation. Be sure to close the levers correctly after actuation. The spring provides assistance and does not return the lever back to its position fully. Switch on the ignition. Perform a function check of the power window using the electric switch on the driver door. The window opens and closes properly. Reinstall the door trim. Charge the pressure reservoir of the hydraulic pump. To do so, hold down the operating switch for 10 seconds. Perform a final quick test with Star Diagnosis. Reinsert the mechanical key into the main key. Allow vehicle to stand for 4 to 5 hours again. Finally, check whether the window has opened again. That is not the case. The problem is thus eliminated. =========================================================== instagram: https://www.instagram.com/mbownersclub/ twitter: https://twitter.com/MB_Owners