Check hydraulic unit and hydraulic cylinder for Vario roof - AR77.37-P-3502G
MODEL 170
Fig 1: Identifying Trunk Luggage Cover Closed Limit Switch And Soft Top Connector (Reed Contact Switch)
Fig 2: Identifying Valve Block, Pressure Gage, Hydraulic Lines And Soft Top Actuation Hydraulic Unit
| Risk of injury caused by pinching or jamming when working on loaded springs or spring bodies | Use only approved clamping devices; shield off hazard area if necessary. Inspect special tools for damage and proper operation (visual inspection). Wear protective gloves. |
AS00.00-Z-0001-01A | |
| Risk of injury as a result of trapping or crushing when working on the partly open Vario roof (stop mode) or within its closing range as a result of the Vario roof suddenly collapsing | Secure the Vario roof with a suitable special tool. | AS77.50-Z-0001-01A | |
| Risk of injury. Moving parts can pinch, crush or , in extreme cases even sever extremities. | No parts of the body or limbs should be within the operating range of the mechanism when moving components. | AS00.00-Z-0009-01A | |
| Risk of injury to skin or eyes caused by hydraulic fluid spraying out under pressure. Risk of poisoning caused by swallowing hydraulic fluid. | Depressurize the hydraulic system completely before starting any work on the system. Wear protective clothing and safety glasses. | AS00.00-Z-0013-01A | |
| Notes on Vario roof assembly work | AH77.30-P-0002-01R | ||
| Use of the special "valve block" tool when performing diagnosis on the Vario roof hydraulic system allows rapid and precise troubleshooting on the hydraulic soft top actuation unit (A7/5) and the hydraulic cylinder. | |||
| Before starting the test, check oil level in reservoir of hydraulic soft top actuation unit (A7/5), correct if necessary (see Maintenance manual) Oil loss in supply reservoir |
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| Remove | |||
| 1 | Remove paneling on the right-hand side of the trunk | AR68.30-P-4800G | |
| 2 | Check tightening torque on emergency actuation valve (N) of hydraulic soft top actuation unit (A7/5), correct tightening torque if necessary. | ||
| *BA77.37-P-1001-01A | |||
| 3 | Connect pressure gauge to hydraulic soft top actuation unit (A7/5) | ↓ |
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| Connection schematic for pressure gauge on Vario roof hydraulic unit (VR) | AD77.50-P-2000-06A | ||
| Figure | |||
| 4 | Disconnect soft top connector (Reed contact switch) (X23/7) | ||
| 5 | Close trunk cover closed limit switch (S69/10) with adhesive tape (see arrow) | ||
| Install | |||
| 6 | Connect valve block to hydraulic unit | AR77.37-P-3500-01G | |
| Figure | |||
| 7 | Close all connections on valve block (2) with knurled screws (7) | ||
| Check | |||
| 8 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure on pressure gauge | ||
| Removal, see: ↓ | AR77.37-P-3500G | ||
| Remove hydraulic unit |
Figure | ||
| 9 | At a hydraulic pressure of > 180 bar, open connector hydraulic line (20) on valve block (2) with knurled screw (7) | ||
| 10 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure of pressure gauge (6) | Removal, see: ↓ |
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| Remove Vario roof actuation hydraulic cylinder | AR77.37-P-3490G | ||
| 11 | At a hydraulic pressure of > 180 bar, reclose connection for hydraulic line (20) on valve block (2) and open hydraulic line (21) with knurled screw (7) | ||
| 12 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure of pressure gauge (6) | Removal, see: ↓ |
|
| Remove Vario roof actuation hydraulic cylinder | AR77.37-P-3490G | ||
| 13 | At a hydraulic pressure of > 180 bar, reclose connection for hydraulic line (21) on valve block (2) and open hydraulic line (31) with knurled screw (7) | ||
| 14 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure of pressure gauge (6) | Removal, see: ↓ |
|
| Remove hydraulic cylinder from front lock | AR77.37-P-3560G | ||
| 15 | At a hydraulic pressure of > 180 bar, reclose connection for hydraulic line (31) on valve block and open hydraulic line (42) with knurled screw (7) | ||
| 16 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure of pressure gauge (6) | Removal, see: ↓ |
|
| Remove hydraulic cylinder for trunk lid actuation | AR77.37-P-3550G | ||
| 17 | At a hydraulic pressure of > 180 bar, reclose connection for hydraulic line (42) on valve block (2) and open hydraulic line (44) with knurled screw (7) | ||
| 18 | Actuate Vario roof switch (S84) five seconds in the "closing" direction and simultaneously read off hydraulic pressure of pressure gauge (6) | Removal, see: ↓ |
|
| Remove hydraulic cylinder for trunk lid actuation | AR77.37-P-3550G | ||
| Remove | |||
| 19 | Disconnect hydraulic lines for valve block (2) from hydraulic soft top actuation unit (A7/5) | ||
| 20 | Disconnect all of the vehicle's own hydraulic lines from valve block (2) and connect to hydraulic soft top actuation unit (A7/5) | ||
| Install | |||
| 21 | Reassemble valve block (2) | ||
| 22 | Install in the reverse order | ||
| 23 | Check oil level of hydraulic unit, correct | AR77.37-P-3501G | |
| 24 | Check Vario roof with Vario roof switch (S84) for proper function |
| Number | Designation | Model 170 | ||
|---|---|---|---|---|
| BA77.37-P-1001-01A | Emergency actuation valve (N) on hydraulic unit | Nm | 3 | |
| Fig. see | AR77.50-P-3100G | |||