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Home >> Mercedes Benz >> 2021 >> C43 AMG 2D Convertible >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Sliding Roof, Soft Top, Top Attachments - 205 Chassis >> Testing & Repair >> Check Hydraulic System Of Soft Top - AR77.37-P-0001LWR

Check Hydraulic System Of Soft Top - AR77.37-P-0001LWR

Model 205.4 

Model 217.4 

Model 238.4 

Fig 1: Soft Top Control Hydraulic Unit Components Location - Model 205.4
G13023804Courtesy of MERCEDES-BENZ USA

Shown on model 205.4 

G13023805Courtesy of MERCEDES-BENZ USA

Shown on model 205.4 

G13023806Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury  to skin or eyes from hydraulic fluid spraying out under pressure. Risk of poisoning  from swallowing hydraulic fluid. Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses. AS00.00-Z-0013-01A
REMOVING Remove     
1 Expose soft top control hydraulic unit (A7/5) and lay down on clean dry cloth Model 205.4 AR77.37-P-1000LWR 
    Model 217.4 AR77.37-P-1000LCA
    Model 238.4
NOTES Protect vehicle interior against escaping hydraulic oil.
Otherwise the vehicle interior can be contaminated.
IMPORTANT Do not disconnect hydraulic lines (1) and electrical connectors (2).
AR77.37-P-1000LWP
2 Remove paneling from spare wheel well    
3 Expose hydraulic lines (1)    
INSPECT Check     
4 Prepare valve block (5)   AR77.37-P-4205-01LWR 
    SPECIAL TOOL Tester Fig 2
    SPECIAL TOOL Record plug Fig 5
    SPECIAL TOOL Adapter Fig 3
    SPECIAL TOOL Valve block Fig 4
5 Unscrew bolts (3) from connection plate (4) on soft top control hydraulic unit (A7/5) and push connection plate (4) in direction of arrow (A)    
6 Unscrew bolts (6) on connection plate (7) from valve block (5) and push connection plate (7) in direction of arrow (B)    
7 Connect diagnostic system and start test for hydraulic system    
REFER TO SELF-DIAGNOSTIC SYSTEMS   Model 205.4, 217.4 AD00.00-P-2000-04B
REFER TO SELF-DIAGNOSTIC SYSTEMS   Model 238.4
IMPORTANT The test is menu-guided via the diagnostic system.
AD00.00-P-2000-06LWO
8 Set up test according to specifications of menu-guided test Connection scheme for pressure test AR77.37-P-4205-02LWR 
    IMPORTANT Connect valve block (5) together with test lines (8), adapter (9) and test equipment (10) between vehicle hydraulic lines (1) and soft top hydraulic unit (A7/5).
See the appropriate corresponding connection diagram.
SPECIAL TOOL Tester
Fig 2
    SPECIAL TOOL Adapter Fig 3
    SPECIAL TOOL Valve block Fig 4
9 Move connection plate (4) opposite direction of arrow (A) and tighten bolts (3) to soft top control hydraulic unit (A7/5) TORQUE SPECIFICATION Model 205.4 Bolt, connection plate to hydraulic unit *BA77.37-P-1002-01D 
    TORQUE SPECIFICATION Model 217.4 Bolt, connection plate to hydraulic unit BA77.37-P-1002-01C
    TORQUE SPECIFICATION Model 238.4 Bolt, connection plate to hydraulic unit BA77.37-P-1002-01E
10 Move connection plate (7) opposite direction of (arrow B) and tighten bolts (6) to valve block (5)    
11 Perform test according to specifications of diagnostic system IMPORTANT The test is menu-guided via the diagnostic system.
The test setup must be adapted according to the test step (operation steps 5 to 10).
 
12 Unscrew bolts (3) from connection plate (4) on soft top control hydraulic unit (A7/5) and push connection plate (4) in direction of arrow (A)    
13 Disconnect valve block (5) together with test lines (8) from soft top control hydraulic unit (A7/5)    
14 Remove test lines (8) from valve block (5), adapter (9) and test equipment (10)    
INSTALLING Install     
15 Insert hydraulic lines (1) into soft top control hydraulic unit (A7/5) IMPORTANT The hydraulic lines (1) are marked with numbers which coincide with the numbers on the connection plate (4).  
16 Move connection plate (4) opposite direction of arrow (A) and tighten bolts (3) to soft top control hydraulic unit (A7/5) TORQUE SPECIFICATION Model 205.4 Bolt, connection plate to hydraulic unit *BA77.37-P-1002-01D 
    TORQUE SPECIFICATION Model 217.4 Bolt, connection plate to hydraulic unit BA77.37-P-1002-01C
    TORQUE SPECIFICATION Model 238.4 Bolt, connection plate to hydraulic unit BA77.37-P-1002-01E
17 Ope soft top with switch and close    
18 Check/correct oil level of hydraulic unit   AR77.37-P-3501LCA 
19 Install soft top control hydraulic unit (A7/5) Model 205.4 AR77.37-P-1000LWR 
    Model 217.4 AR77.37-P-1000LCA
    Model 238.4 AR77.37-P-1000LWP
SOFT TOP HYDRAULIC SYSTEM

Number Designation Model 217.4
BA77.37-P-1002-01C Bolt, connection plate to hydraulic unit Nm 4
SOFT TOP HYDRAULIC SYSTEM

Number Designation Model 205.4
BA77.37-P-1002-01D Bolt, connection plate to hydraulic unit Nm 4
SOFT TOP HYDRAULIC SYSTEM

Number Designation Model 238
BA77.37-P-1002-01E Bolt, connection plate to hydraulic unit Nm 4
Fig 2: Identifying Tester (126 589 14 21 00)
G10003494Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Adapter (171 589 00 91 00)
G11139625Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Valve Block (230 589 00 91 00)
G11129786Courtesy of MERCEDES-BENZ USA
Fig 5: Identifying Record Plug (129 589 00 91 00)
G07473018Courtesy of MERCEDES-BENZ USA