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Remove/Install Transmission Oil Pump - AR27.10-P-0400EWM

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Transmission 725.0 (except 725.007/017/037/047) 

G14546752Courtesy of MERCEDES-BENZ USA
Fig 1: Transmission Oil Pump Components Location - Transmission 725.0 (Except 725.007/017/037/047)
G14546753Courtesy of MERCEDES-BENZ USA
CAUTION Risk of injury  to skin and eyes due to handling of transmission oil. Health risk caused by swallowing transmission oil Wear protective gloves, protective clothing and safety glasses.
Do not pour transmission oil into beverage bottles.		 AS00.40-Z-0001-01A
Notice Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
Notice Notes on threaded connections fastened using a tightening angle-based tightening process   AH00.00-P-0020-01A
Notice Notes on self-locking nuts and bolts   AH00.00-P-0001-01KOA
  Notes on automatic transmission   AH27.19-P-0001-01NKB 
REMOVING Remove     
1 Fasten transmission onto assembly stand.   AR27.10-P-0600-01EWM
REFER TO SPECIAL TOOLS 000 588 00 31 00 Assembly stand for cars IMPORTANTCommercially available devices/tools  Boom crane WS01.00-Z-3028KOB
    SPECIAL TOOL Lifting device Fig 4
    SPECIAL TOOL Support fixture Fig 5
2 Unscrew quick-release fastener and collect transmission oil in a suitable container. SPECIAL TOOL Assembly tool Fig 6
3.1 Remove torque converter. Transmission 725.0 (except 725.007/017/037/047/06/091/096/099) AR27.20-P-0050EWM
    SPECIAL TOOL Assembly device Fig 3
3.2 Remove wet clutch. Transmission 725.06, 725.09 (except 725.095) AR27.51-P-0300MNE
4 Remove radial shaft sealing ring (4). Transmission 725.0 (except 725.007/017/037/047/06/09) AR27.40-P-0300EWM
    Transmission 725.06/09 AR27.40-P-0300MNE
5 Remove screws (2, 5).    
6 Remove transmission firewall cover (3). NOTES Carefully pry off transmission firewall cover (3) at lugs only (arrows).
Otherwise the sealing surfaces will be damaged.		  
7 Remove drive gear (7), chain (8) and oil pump gear (9) together.    
8 Remove seal (6).    
9 Clean sealing surfaces on transmission firewall cover (3) and transmission housing (1). NOTES When cleaning, make sure that dirt particles do not enter the transmission.
Otherwise, the transmission may be damaged.
Assembly cleaner		  
      *BR00.45-Z-1028-04A 
10 Remove oil pump (10) from transmission housing (1).   AR27.10-P-0400-02EWM 
    SPECIAL TOOL Removal and installation tool Fig 7
INSTALLING Install     
11 Check O-rings of the oil pump (10) for damage. If there is damage to the O-rings:
↓
replace oil pump (10).		  
12 Install oil pump (10) into transmission housing (1).   AR27.10-P-0400-02EWM 
    SPECIAL TOOL Removal and installation tool Fig 7
13 Slide on drive gear (7), chain (8) and oil pump gear (9) together. NOTES Check chain (8) is correctly seated on drive gear (7) and oil pump gear (9).
Otherwise mounting problems may occur.		  
14 Mount new seal (6).    
15 Install transmission firewall cover (3).    
16 Tighten screws (2, 5). TORQUE SPECIFICATION Screw/bolt, firewall cover to transmission housing *BA27.10-P-1005-04H 
    TORQUE SPECIFICATION Screw/bolt, firewall cover to external plate carrier *BA27.10-P-1006-04H 
17 Install new radial shaft sealing ring (4). Transmission 725.0 (except 725.007/017/037/047/06/09) AR27.40-P-0300EWM
    Transmission 725.06/09 AR27.40-P-0300MNE
18.1 Install torque converter. Transmission 725.0 (except 725.007/017/037/047/06/091/096/099)  
      AR27.20-P-0050EWM
    Grease, silicone-based, 100 g *BR00.45-Z-1008-06A 
    SPECIAL TOOL Assembly device Fig 3
    SPECIAL TOOL Parallel rest Fig 2
18.2 Install wet clutch. Transmission 725.06, 725.09 (except 725.095) AR27.51-P-0300MNE
19 Screw in quick-release fastener of oil pan. IMPORTANT Replace seal.  
    SPECIAL TOOL Assembly tool Fig 6
20 Detach transmission from assembly stand.    
REFER TO SPECIAL TOOLS 000 588 00 31 00 Assembly stand for cars   WS01.00-Z-3028KOB
      AR27.10-P-0600-01EWM
    IMPORTANTCommercially available devices/tools  Boom crane  
    SPECIAL TOOL Support fixture Fig 5
    SPECIAL TOOL Lifting device Fig 4
21 Fill transmission with transmission oil.   AR27.00-P-0270EWN 
AUTOMATIC TRANSMISSION COMPLETE

Number Designation Transmission 725.0/1
BA27.10-P-1005-04H Screw/bolt, firewall cover to transmission housing M8 Stage 1 Nm 10
Stage 2 ∠° 90
AUTOMATIC TRANSMISSION COMPLETE

Number Designation Transmission 725.0/1
BA27.10-P-1006-04H Screw/bolt, firewall cover to external plate carrier M6 Nm 10
Fig 2: Identifying Parallel Rest (126 589 04 31 00)
G09975668Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Assembly Device (725 589 01 31 00)
G12935450Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Lifting Device (724 589 02 63 00)
G12935451Courtesy of MERCEDES-BENZ USA
Fig 5: Identifying Support Fixture (725 589 00 40 00)
G12935452Courtesy of MERCEDES-BENZ USA
Fig 6: Identifying Assembly Tool (725 589 02 90 00)
G12935453Courtesy of MERCEDES-BENZ USA
Fig 7: Identifying Removal And Installation Tool (725 589 00 59 00)
G12935443Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1008-06A Grease, silicone-based, 100 g A 001 989 28 51
BR00.45-Z-1028-04A Assembly cleaner A 000 986 56 01
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