Remove/install oil pump

AR27.10-S-0400EA

Remove/install oil pump

19.08.2020

Transmission

725.0 in model 447, 448

1

Torque converter housing

2

Bolts

3

Spur pinion cap

4

Radial shaft sealing ring

5

Bolts

1

Torque converter housing

6

Seal

7

Drive gear

8

Chain

9

Oil pump gear

10

Oil pump

 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

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

General information on repair work on transmission

AH27.00-S-1000-01PS



Remove

1

Remove automatic transmission.

Transmission 725.0 in model 447
except code ZG2 (Permanent all-wheel drive)
Transmission 725.0 in model 448

AR27.10-S-0005EA

Transmission 725.0 in model 447
with code ZG2 (Permanent all-wheel drive)

AR27.10-S-0005EB

2

Secure automatic transmission on assembly stand.

AR27.10-S-0600-01EA



000 588 00 31 00 Assembly stand for cars

WS01.00-N-3028B

 Commercially available devices/tools
Workshop crane

 Lifting device

*724589026300

 Support fixture

*725589004000

3

Drain automatic transmission fluid.

AR27.00-S-0001EA

4

Remove torque converter.

AR27.20-S-0500-01EA

 Assembly device

*725589013100

5

Remove radial shaft sealing ring (4).

AR27.40-S-0301EA

6

Remove screws (2, 5).

7

Remove spur pinion cap (3).


Carefully pry off spur pinion cap (3) at lugs only (arrows).
The sealing surfaces can be damaged otherwise.

8

Remove drive gear (7), chain (8) and oil pump gear (9) together.

9

Remove seal (6).

10

Remove oil pump (10) from outer plate carrier.

AR27.10-S-0400-02EA

 WIS Service Media
wsm://04_201900_90

 Removal and installation tool

*725589005900



Clean

11

Clean sealing surfaces on spur pinion cap (3) and on torque converter housing (1).

Assembly cleaner

*BR00.45-Z-1028-04A



Check

12

Check O-rings of the oil pump (10) for damage.

If the O-rings are damaged,



replace oil pump (10).



Install

13

Install oil pump (10) in outer plate carrier.

AR27.10-S-0400-02EA

 WIS Service Media
wsm://04_201900_91

 Removal and installation tool

*725589005900

14

Install drive gear (7), chain (8) and oil pump gear (9) together.


Check that chain (8) is correctly seated on drive gear (7) and oil pump gear (9).
Otherwise mounting problems may occur.

15

Install new seal (6).

16

Install spur pinion cap (3).

17

Screw in new bolts (2, 5).

 Bolt, spur pinion cap to transmission housing

*BA27.10-N-1005-06EA

 Bolt, spur pinion cap to external plate carrier

*BA27.10-N-1006-06EA

18

Install new radial shaft sealing ring (4).

AR27.40-S-0301EA

19

Insert torque converter.

AR27.20-S-0500-01EA

 Commercially available devices/tools
Digital vernier caliper

Protrusion of torque converter to torque converter housing

*BE27.20-N-1001-01EA

Long-life grease

*BR00.45-Z-1001-06A

 Support fixture

*725589004000

 Assembly device

*725589013100

 Parallel rest

*126589043100

20

Remove automatic transmission from support fixture.



000 588 00 31 00 Assembly stand for cars

WS01.00-N-3028B

 Commercially available devices/tools
Workshop crane

 Support fixture

*725589004000

 Lifting device

*724589026300

21

Install automatic transmission.

Transmission 725.0 in model 447
except code ZG2 (Permanent all-wheel drive)
Transmission 725.0 in model 448

AR27.10-S-0005EA

Transmission 725.0 in model 447
with code ZG2 (Permanent all-wheel drive)

AR27.10-S-0005EB

22

Fill automatic transmission with automatic transmission fluid.

AR27.00-S-0001EA

Check values for torque converter

Number

Designation

Transmission 725.0 in model 447 with engine 654.9

Transmission 725.0 in model 447, 448 with engine 274

BE27.20-N-1001-01EA

Protrusion of torque converter to torque converter housing

mm

21,2 (2)

31,2 (2)

 Automatic transmission complete

Number

Designation

Transmission 725.0 in model 447, 448

BA27.10-N-1005-06EA

Bolt, spur pinion cap to transmission housing

M8

Stage 1

Nm

10

Stage 2

0

90

 Automatic transmission complete

Number

Designation

Transmission 725.0 in model 447, 448

BA27.10-N-1006-06EA

Bolt, spur pinion cap to external plate carrier

M6

Nm

10

Repair materials

Number

Designation

Order number

BR00.45-Z-1001-06A

Long-life grease

A 000 989 63 51 11

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01