Disassembly and assembly of the main gear reducer
11a, 43e, 46b. - Outer bearing rings; 11b, 43d, 46a. - Inner bearing ring; 13 - Differential housing; 13a - Bolts; 29, 30 - Retaining rings; 32a - Radial oil seal; 33 - Drive shaft flange; 40 - Nut; 41 - Flange; 42 - Radial oil seal; 44 - Bushing; 45, 48 - Gaskets; 47 - Drive gear; 47a - Driven gear; 50 - Gearbox housing; 54 - Back cover; 55 - Sapun
Disassembly
1. Remove the gearbox housing 50. Drain the oil from the gearbox.
2. Secure the gearbox in a vice.
3. Remove the back cover 54.
4. Remove the retaining ring 30 from both flanges of the drive shafts 33.
5. Remove the drive shaft flanges 33.
6. Press out the left and right radial oil seals 32a.
7. Remove retaining rings 29.
8. Insert pin 046 for differential gear on the right side and press the differential so that it touches the gearbox housing on the left side. Remove both outer rings 11a of the roller bearings from the gearbox housing.
Material based on data from the portal MercedesMAN
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9. Remove differential 13 from the gearbox.
10. Remove both inner races 11b of the tapered roller bearings from differential 13.
11. Loosen and unscrew bolts 13a securing the driven gear of the main transmission.
12. Remove the driven gear of the main transmission 47a from the differential 13.
13. Loosen and unscrew nut 40 securing flange 41.
14. Remove flange 41.
15. Remove the main gear pinion 47 from the gearbox.
16. Press out oil seal 42 from the gearbox.
17. Remove the inner ring of bearing 43d.
18. Remove the outer rings of bearings 46b 43e from the gearbox.
19. Remove gasket 45.
20. Remove sleeve 44 with gasket 48 from the drive gear.
Examination
1. Check all parts for wear and replace if necessary.
2. Check the driving gear 47 and driven gear 47a for matching numbering.
Assembly and adjustment
1. Press the inner ring of bearing 46a onto the drive gear 47.
2. Calculate the thickness of the 45 gasket and install it in the gearbox housing.
3. Install the outer rings of bearings 46b, 43e into the gearbox housing.
4. Install sleeve 44 with gaskets 48 on both sides on the drive gear.
5. Install the drive gear 47 into the gearbox 50.
6. Install the inner ring of bearing 43d on the drive gear and press them in together with the radial seal 42.
7. Install flange 41 on the drive gear.
8. Tighten nut 40.
9. Adjust the friction torque in the drive gear bearing.
10. Check the drive gear clearance.
11. Install driven gear 47a on differential 13. To do this, it is necessary to heat the driven gear to a temperature of 75-85°C.
12. Press the inner bearing race 11b onto the differential.
13. Further assembly is carried out in the reverse order of disassembly.
14. Check and adjust the flange axial clearance.
15. Secure the back cover 54.
16. Remove the gearbox from the vice.
Installation
1. Install gearbox 50.
2. Fill with oil. Oil volume: 1.2 l.
3. Replace breather 55 on rear cover 54.
Technical data:
- Frictional moment in the bearing of the drive gear (new tapered roller bearings): 215-245 Nm.
- Permissible deviation from the adjustment parameter at the end of the drive gear: -0.02/+0.01 mm.
- Clearance between the driving and driven gears of the main transmission: 0.08-0.014 mm.
- Axial clearance between flange and differential housing: 0.03-0.3 mm.