Fitting ring gear on differential - AR35.31-P-0550-19D

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Test values of rear axle center assembly gear set

Number	Designation		Model 124	Model 129	Model 140
BE35.31-P-1003-03A	Temperature of ring gear for installation	°C	75 - 85	75 - 85	75 - 85

Test values of rear axle center assembly gear set

Number	Designation		Model 210
BE35.31-P-1003-03A	Temperature of ring gear for installation	°C	75 - 85

Rear axle center assembly gear set

Number	Designation			Models 124.008/028/ 029/031/032/034/ 036/051/052/061/ 066/088/091/092	Models 129.058/ 063 up to 31.05.94 Models 129.061/066
BA35.31-P-1001-03D	Locking bolt, ring gear to differential housing	without serrations	Nm	120	120
BA35.31-P-1001-03D	Locking bolt, ring gear to differential housing	with serrations	Nm	140	140

Rear axle center assembly gear set

Number	Designation			Models 140.028/ 032/033 up to 31.05.94 Models 140.042/ 043/063/1	Models 210.070/074/270/274 up to 31.01.98, Models 210.072/272/617
BA35.31-P-1001-03D	Locking bolt, ring gear to differential housing	without serrations	Nm	120	120
BA35.31-P-1001-03D	Locking bolt, ring gear to differential housing	with serrations	Nm	140	140

Fig 1: Identifying Telethermometer (124 589 07 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Assembly Mandrel (116 589 18 61 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Carefully clean ring gear bore and ring gear seat on the differential housing.
Heat up ring gear (47a) to installation temperature using hot plate (080), constantly checking the temperature with a telethermometer (070).

Fig 3: Checking Temperature With Telethermometer
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Clamp differential housing with assembly mandrel (046).
Mount ring gear (47a) on the differential housing, assisting with light blows from a hammer (rubber mallet) if necessary.

Pay attention to any marking applied (arrow) on the ring gear and differential housing.

Fig 4: Locating Ring Gear
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Attention should be paid to the length of the ring gear bolts when installing a new differential housing or new ring gear bolts.

Only use ring gear bolts with a length of 20 mm on a differential housing with a mounting flange which is only 8 mm thick (dimension "B").

Fig 5: Checking Ring Gear Heat
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Tighten the locking bolts with or without serrations (13a) for mounting the ring gear (47a) evenly and diagonally.

Ring gear bolts (13a) must always be replaced after they have been used once.

Fig 6: Identifying Ring Gear Bolts
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.