Check hydraulic unit and hydraulic cylinder for Vario roof

AR77.37-P-3502G

Check hydraulic unit and hydraulic cylinder for Vario roof

22.1.04

Danger!

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

Danger!

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

 Danger!

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

Danger!

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



Remove

1

Remove paneling on the right-hand side of the trunk

 Do not remove rear center section paneling.

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.

 Tightening torque should not be exceeded because the valve seat can be damaged and pressure loss can occur in the hydraulic soft top actuation unit (A7/5).

 Emergency actuation valve (N) on hydraulic unit

*BA77.37-P-1001-01A

3

Connect pressure gauge to hydraulic soft top actuation unit (A7/5)

 For connection pressure gauge, see:




Connection schematic for pressure gauge on Vario roof hydraulic unit (VR)

AD77.50-P-2000-06A

tester.

*126589142100

4

Disconnect soft top connector (Reed contact switch) (X23/7)

 Yellow connector.

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

 Valve block

*230589009100

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

 Replace hydraulic unit at a hydraulic pressure of < 180 bar.
Removal, see: 

Remove hydraulic unit

AR77.37-P-3500G

 Test adapter.

*126589142100

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)

 At a hydraulic pressure of < 180 bar, replace right hydraulic cylinder for Vario roof actuation

Removal, see: 

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)

 At a hydraulic pressure of < 180 bar, replace left hydraulic cylinder for Vario roof actuation.

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)

 At a hydraulic pressure of < 180 bar, replace front lock cylinder.

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)

 At a hydraulic pressure of < 180 bar, replace right hydraulic cylinder for trunk lid actuation.
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)

 At a hydraulic pressure of < 180 bar, replace left hydraulic cylinder for trunk lid actuation
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)

When disconnecting, hold a rag around the hydraulic line connections to catch oil running out.

20

Disconnect all of the vehicle's own hydraulic lines from valve block (2) and connect to hydraulic soft top actuation unit (A7/5)

 The hydraulic lines as well as the connections for the hydraulic soft top actuation unit (A7/5) have corresponding numbers (20, 21, 31, 42, 44) .
 Ensure that lines are connected to the same numbers.



Install

21

Reassemble valve block (2)

22

Install in the reverse order

Steps 5 up to 1.

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