Remove/install auxiliary oil pump for automatic transmission

AR27.30-S-0651E

Remove/install auxiliary oil pump for automatic transmission

06.03.2020

Model

447, 448 with transmission 722.9

with code MJ8 (ECO start/stop function)

Modification notes

11.09.2018

Method adapted

Operation steps 1, 2, 7, 10

1

Electrical connector

4

Auxiliary oil pump

2

Mounting clip

5

Oil guide pipe

3

Bolts

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

 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

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Notes on automatic transmission

AH27.19-P-0001-01NKB

 

Remove/install

1

Remove lower engine compartment paneling.

AR61.20-S-1105E

 Installation: Install engine compartment lining at bottom only after the leak test of the auxiliary oil pump (4) has been carried out.

2

Clean oil pan of automatic transmission and surrounding area thoroughly.


Cleanliness must be ensured when performing work on the automatic transmission.
Otherwise, even the smallest foreign particles in the hydraulic components of the automatic transmission can lead to malfunctions or total failure of the automatic transmission.

 Use lint-free cleaning cloths when cleaning. Chamois leathers are the most suitable.

Assembly cleaner

*BR00.45-Z-1028-04A

3

Remove drain screw from oil pan.


Do not pry off overflow pipe from the base of the oil pan.
Otherwise, the oil pan has to be removed to enable the overflow pipe to be mounted again.

 Collect escaping transmission oil.

 Commercially available devices/tools
Collection bowl

 Drain screw on oil pan

*BA27.10-N-1005-04B

If the overflow pipe has been pried off from the base of the oil pan.



Fit overflow pipe of oil pan.

AR27.10-S-7030E

4

Remove stabilizer bar from integral carrier.

Model 447 except code ZG2 (Permanent all-wheel drive) Model 448

AR32.35-S-2050E

MODEL 447 with CODE ZG2 (Permanent all-wheel drive)

AR32.35-S-2050EA

5

Disconnect electrical connector (1).

6

Unfasten electrical wiring harness.

 To do so, remove retaining clip (2).

 Installation: Check retaining clip (2).

If corresponding findings are present,



replace retaining clip (2).

7

Remove auxiliary oil pump (4).

 To do so, remove bolts (3). Seal connections. Collect escaping transmission oil.

 Commercially available devices/tools
Collection bowl

 Installation: Replace plain couplers (5).

 Bolt, auxiliary oil pump to transmission

*BA27.55-N-1001-01J

 Record plug

*129589009100

8

Install in the reverse order.

9

Fill automatic transmission with oil.

AR27.00-S-0270E



Check

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

10

Check auxiliary oil pump (4) for leak tightness with engine running.

Notes on evaluating leakages

AH00.00-N-0011-01A

 Visual inspection only.

 Complete automatic transmission

Number

Designation

Transmission 722.9

BA27.10-N-1005-04B

Drain screw on oil pan

Nm

22

 Oil cooling

Number

Designation

Transmission 722.9 in model 447, 448

BA27.55-N-1001-01J

Bolt, auxiliary oil pump to transmission

Nm

8

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01