Automatic transmission fluid and oil filter change

AP27.00-S-2702E

Automatic transmission fluid and oil filter change

12.09.2017

Transmission

722.9 in model 447

Transmission

722.9 in model 448

1

Oil pan

5

Screw

9

Seal

2

Drain screw

6

Sprag

10

Shield

3

Overflow pipe

7

Magnet

4

Drift

8

Oil filter

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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

Notes on automatic transmission

AH27.19-P-0001-01NKB

Remove

1

Move A/T into neutral position and switch off ignition

2

Remove lower engine compartment paneling

Only if this was not already removed for other maintenance operations.



AR61.20-S-1105E

3

Clean area surrounding oil pan (1)

4

Drain transmission oil from oil pan (1)

 To do so, remove drain screw (2) and collect escaping oil in suitable container.

5

Remove auxiliary oil pump



Model 447, 448 with code MJ8 (ECO start-stop function)

AR27.30-S-0651E

6

Drain transmission oil from torque converter



AR27.20-S-0200-03E

 Drain plug to torque converter

*BA27.20-N-1001-01B

 Socket wrench bit

*001589650900

 Counterholder

*651589004000

 Counterholder

*651589084000

7

Detach overflow pipe (3) using drift (4) from base (arrow), and drain off remaining transmission oil from oil pan (1)

 Transmission oil escapes immediately after detaching the overflow pipe (3).

 Drift

*722589031500

8

Screw in drain screw (2) by hand

 Replace seal.

9

Remove shield (10)

10

Remove oil pan (1)

 To do this, remove the bolts (5).

11

Remove sprag (6)

12

Remove seal (9)

13

Remove oil filter (8) downwards



Clean

14

Mark installation position of magnet (7)

15

Remove magnet (7) from oil pan (1) and clean

16

Check magnet (7) for damage

If damage is present



Replace magnet (7).

17

Clean oil pan (1) and sealing surfaces on transmission


Sealing surfaces must be absolutely free of oil and grease. Have the cleaning sprays completely extracted.
Leaks may occur otherwise.



Install

18

Install new oil filter (8)

19

Install magnet (7) in oil pan (1)

 Ensure bulb is correctly installed.

20

Install new overflow pipe (3)

 To do so, push overflow pipe (3) firmly onto base (arrow). The overflow pipe (3) must latch into place noticeably.

21

Install oil pan (1) with new seal (9)


The sprags (6) are only approved for transmission 722.9 and must not be interchanged with sprags (6) of other transmissions.
Contact corrosion can otherwise occur.

 To do so, screw in new bolts (5). Do not apply any sealant or sealing compound to oil pan (1) and transmission housing.

 Bolt, oil pan to transmission housing

*BA27.10-N-1006-04B

22

Install shield (10)

23

Install auxiliary oil pump



Model 447, 448 with code MJ8 (ECO start-stop function)

AR27.30-S-0651E

24

Fill with transmission oil



AR27.00-S-0270E

25

Install lower engine compartment paneling



AR61.20-S-1105E

 Install lower engine compartment paneling after all other maintenance operations have been completed.

26

Confirm transmission oil change and filter change in maintenance booklet or in Digital Service Booklet (DSB)

 Complete automatic transmission

Number

Designation

Transmission 722.9

BA27.10-N-1006-04B

Bolt, oil pan to transmission housing

Stage 1

Nm

4

Stage 2

°

180

 Torque converter

Number

Designation

Transmission 722.9

BA27.20-N-1001-01B

Drain plug to torque converter

M8

Nm

10

M10

Nm

15