AR35.25-G-0650-02CC | Assemble hub reduction gear | Rear axles 747.220/221 | |
Danger! | Risk of injury to skin and eyes caused by handling hot or glowing objects. | Wear safety gloves, protective clothing and safety glasses, if necessary. |
Modification notes
7.9.11 | Assembly tool 437 589 19 43 00 for installing ball bearing () inserted. | Operation steps 8 to 14 | |
26.1.12 | Coat gearing on drive shaft using long-life grease, added. | Operation step 10 |
Rear axle hub drive
Number | Designation | Rear axle 747.220 | Rear axle 747.221/222/224 | ||
BA35.25-N-1001-02A | Bolt, wheel hub drive to axle tube | Hexagon socket | Nm | 200 | 200 |
External socket | Nm | - | - | ||
BA35.25-N-1002-02A | Bolt, output gear to axle tube | Nm | 55 | 55 | |
BA35.25-N-1003-02A | Bolt, drive gear to rear axle shaft | Nm | - | 200 | |
425 589 04 14 00
Press-in tool
Assembly sleeve
Guide bolts
Assembly tool
425 589 02 15 00
437 589 11 43 00
437 589 13 43 00
Assembly tool
437 589 19 43 00
Repair materials
Number | Designation | Order number |
BR00.45-Z-1015-01A | Loctite 5203 sealant | A 002 989 71 20 10 |
BR00.45-Z-1001-06A | Long-life grease | A 000 989 63 51 11 |
G33.25-3243-01
1 Place locking plate (16) onto driven gear (6).
2 Press cylindrical roller bearing (15) onto driven gear (6).
Heat cylindrical roller bearing (15) using a hot plate up to max. 80 °C before pressing on.
Shown on driven gear (6) of rear axle 747.220
3.1 Install shims, ABS rotor (17) and circlip.
Rear axles 747.220.
The retaining ring must be installed with zero clearance, place shims under the ABS rotor (17). Determine the shims required using the old ABS rotor (17), then install the new ABS rotor (17). The ABS rotor (17) may only be used once.
3.2 Install shims, spacer washer and circlip.
Rear axle 747.221.
Retaining ring must be fitted with zero clearance, place shims under spacer washer.
G33.25-3122-01
4 Press cylindrical roller bearing (13) onto drive wheel (11).
Heat cylindrical roller bearing (13) using a hot plate up to max. 80 °C before pressing on.
G33.25-3127-01
5 Coat cylindrical roller bearing (14) with long-life grease and install in hub reduction gear housing (2) with a copper drift.
Do not damage bearing seat of cylindrical roller bearing (14).
G33.25-3161-01
6 Install assembly ring (17) in cylindrical roller bearing (5).
Assembly ring (17) is included in the repair kit of the new cylindrical roller bearing (5).
7 Coat cylindrical roller bearing (5) with long-life grease and install in hub reduction gear housing (2) with a copper drift.
Do not damage bearing seat of cylindrical roller bearing (5).
G35.25-3179-11
8 Mount base plate (24.1) to axle tube.
To fasten, use the bolts of the hub reduction gear housing (2).
9 Mount both guide pins (24.2).
10 Coat gearing on drive shaft using long-life grease.
G35.25-3181-11
11 Fit drive wheel (11) with ball bearing (13) onto axle tube.
Grease bearing outer race of ball bearing (13) with transmission oil.
12 Mount flange (24.9) and bridge (24.3) onto both guide pins (24.2).
Screw nuts (24.8) onto bridge (24.3) finger-tight.
13 Press in ball bearing (13).
To do so, counterhold nut (24.7) and screw in bolt (24.6).
14 Completely remove assembly tool.
15 Turn grub screw (M10) into locking plate (16) and fit assembly tool to driven gear (6).
16 Install assembly tool with output gear (6) on axle tube.
Align locking plate (16) with grub screws (M10) to screw holes in axle tube.
17 Install output gear (6).
Turn nut (9.2) using one-way ratchet (10). Nut (9.1) may not be installed on the spindle.
18 Detach assembly tool from driven gear (6) and from axle tube.
G35.25-3159-03
G33.25-3133-01
19 Remove grub screws (M10) and tighten bolts (8) of output gear (6) .
Do not remove all grub screws (M10) at once.
G33.25-3135-01
20 Block output gear (11) and tighten bolt (12) .
Rear axle 747.221 only.
Replace bolt (12) For blocking, place a copper drift between drive gear (11) and driven gear (6).
G33.25-3148-01
21 Install assembly sleeve over cylindrical roller bearing (5) of output gear (6).
Watch the assembly sleeve to ensure that bearings do not fall out.
22 Install guide bolts in the upper two bores (arrows).
23 Coat contact surface on hub reduction gear housing (2) and bolts (7) with sealant.
24 Grease rollers of cylindrical roller bearing (14) with long-life grease.
25 Mount hub reduction gear housing (2) and tighten bolts (7).
Center the hub reduction gear housing (2) on the bearing seat using the bolts (7).
The assembly sleeve is pressed out automatically when the spur gear housing (2) is installed.
G35.25-3115-03
26 Apply long-life grease to the seal rings (3, 4) and install in the hub reduction gear housing (2) using installation tool.
The seals (3, 4) are not identical; one incorporates a supplementary dust lip. The seal with the extra dust lip should be installed on the outside.
27 Install spacer ring (1) in hub reduction gear housing (2).
G33.25-3159-03
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