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

Transmission 725.0 (except 725.007/017/047)

Courtesy of MERCEDES-BENZ USA

Fig 1: Automatic Transmission Oil Pump Components Location - Transmission 725.0 (except 725.007/017/047)

Courtesy of MERCEDES-BENZ USA

	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
	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Notes on automatic transmission		AH27.19-P-0001-01NKB
	Remove
1	Fasten transmission onto assembly stand.		AR27.10-P-0600-01EWM
	000 588 00 31 00 Assembly stand for cars	Commercially available devices/tools Boom crane	WS01.00-N-3028B
		Lifting device	Fig 4
		Support fixture	Fig 5
2	Unscrew quick-release fastener and collect transmission oil in a suitable container.	Assembly tool	Fig 6
3.1	Remove torque converter.	Transmission 725.0 (except 725.007/017/047/06/09)
			AR27.20-P-0500-01EWM
		Assembly device	Fig 3
3.2	Remove wet clutch.	Transmission 725.06/09	AR27.51-P-0300MNE
4	Remove radial shaft sealing ring (4).	Transmission 725.0 (except 725.007/017/047/06/09)	AR27.40-P-0300EWM
5	Remove screws (2, 5).
6	Remove transmission firewall cover (3).	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).	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
		Removal and installation tool	Fig 7
	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		AR27.10-P-0400-02EWM
	(1).	Removal and installation tool	Fig 7
13	Slide on drive gear (7), chain (8) and oil pump gear (9) together.	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).	Screw/bolt, firewall cover to transmission housing	*BA27.10-P-1005-04H
		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 725.007/017/047/06/09)	AR27.40-P-0300EWM
18.1	Install torque converter.	Transmission 725.0 (except 725.007/017/047/06/09)	AR27.20-P-0500-01EWM
		Grease, silicone-based, 100 g	*BR00.45-Z-1008-06A
		Assembly device	Fig 3
		Parallel rest	Fig 2
18.2	Install wet clutch.	Transmission 725.06/09	AR27.51-P-0300MNE
19	Screw in quick-release fastener of oil pan.	Replace seal. Assembly tool	Fig 6
20	Detach transmission from assembly stand.	AR27.10-P-0600-01EWM
	000 588 00 31 00 Assembly stand for cars		WS01.00-N-3028B
		Commercially available devices/tools Boom crane
		Support fixture	Fig 5
		Lifting device	Fig 4
21	Fill transmission with transmission oil.	Transmission 725.037 in model 167	AR27.00-P-0270EWH
		Transmission 725.0 (except 725.007/017/037/047)	AR27.00-P-0270EWN

AUTOMATIC TRANSMISSION COMPLETE

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