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| Illustration 1 | g00275314 |
Axle Housing and Bearing (Typical Illustration) (1) Ring gear (2) Axle housing (3) Nut (4) Bearing cup (5) Bearing cone (6) Bearing cone (7) Bearing cup (8) Duo-cone seal (9) Axle shaft (A) Bolt circle radius | |
- Freeze ring gear (1) to a limit of −70°C (−94°F). Use four dowel holes (not shown) as guides and press ring gear into axle housing (2) so that the chamfer side of the ring gear is toward the axle housing. Check that the ring gear is fully seated against the housing shoulder. Wipe the ring gear dry. Lubricate the ring gear in order to prevent rust. Install the locking dowels. Peen the housing in order to close up half of the dowel hole. Closing the dowel holes will retain the dowels in place.
- Press inboard bearing cup (4) and outboard bearing cup (7) into the housing. Do not freeze the bearing cups before installation. Check that the bearing cups are fully seated against the housing shoulders.
- Press bearing cone (6) on axle shaft (9). Do not heat the bearing cone before installation. Check that the cone is fully seated against the shoulder of the axle shaft. Lubricate the cone roller assembly.
- Install Duo-Cone seals (8) to axle shaft (9) and to housing (2) .
Note: At assembly, rubber toric seals must be clean and dry and all surfaces that contact the rubber toric seals must be clean and dry. Immediately before installation, apply a thin layer of oil on the surfaces of the metal seals that contact the rubber toric seals. The seal must be assembled square with the bore. Rubber toric seals must not have bulged and these seals must also not have twisted.
- Secure axle shaft (9) in a vertical position so that the rim assembly flange is down. With a lifting device, lower housing (2) over the axle shaft.
- Press bearing cone (5) onto axle shaft (9) so that end play remains in the bearing. Lubricate the cone roller assembly.
- Lubricate adjusting nut (3). Install adjusting nut (3) so that the part number is facing away from the bearing cone. Tighten the nut until only a small amount of end play remains in the axle shaft and bearing assembly.
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Table 1 Required Tools Part Number Description Quantity FT-2615 Rolling Torque Bar 1 6V-7820 Torque Multiplier 1 4C-8501 Spanner Wrench 1
- Measure the torque that is needed to rotate housing (2). This is the seal drag torque. Record the measured seal drag torque. Measure the seal drag torque by one of the methods that follow.
- To measure seal drag torque, fasten rolling torque bar (D) across the axle housing. Rolling torque bar (D) will center the mounting face of the housing. Place the torque wrench on the bolt or the nut at the center of rolling torque bar (D). While you turn housing (2) with the torque wrench, record the reading on the torque wrench. The torque wrench reading is the seal drag torque.
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Illustration 2 g00305001
Typical Illustration
(D) Rolling torque bar
- To measure seal drag torque, place the torque wrench on a bolt that is installed in the bolt circle of housing (2). While you turn housing (2) with the torque wrench, record the reading on the torque wrench. Use the following formula to calculate the actual seal drag torque:
SDT = (C x (B + A)) / B
"SDT" is the actual seal drag torque in N·m.
"C" is the torque wrench reading in N·m.
"B" is the length of the torque wrench in meters.
"A" is the bolt circle radius of axle housing (2) in meters. This is equal to 0.229 m (9.016 inch).
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Illustration 3 g00353124
Typical Illustration
- While you turn housing (2), tighten nut (3). Tighten nut (3) until the torque wrench reading equals the axle bearing preload rolling torque plus the actual seal drag torque. Use the seal drag torque that was recorded in Step 8.
Axle bearing preload rolling torque
- New bearings ... 9 to 16 N·m (7 to 12 lb ft)
- Used bearings ... 4.5 to 8 N·m (3.5 to 6 lb ft)
- New bearings ... 9 to 16 N·m (7 to 12 lb ft)
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| Illustration 4 | g00353123 |
Typical Illustration (F) Torque wrench and spanner wrench | |
- Measure the axle bearing preload rolling torque plus the actual seal drag torque with one of the methods that follow.
- Fasten rolling torque bar (D) across the axle housing. Rolling torque bar (D) will center the mounting face of the housing. Place the torque wrench on the bolt or the nut at the center of rolling torque bar (D). While you turn housing (2) with the torque wrench, record the reading on the torque wrench. The torque wrench reading is the axle bearing preload rolling torque plus the seal drag torque.
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Typical Illustration
(D) Rolling torque Bar
- Install a bolt in the bolt circle of housing (2). While you turn housing (2) with the torque wrench, tighten nut (3). Tighten nut (3) until the torque wrench reading equals the axle bearing preload rolling torque plus the actual seal drag torque. Use the following formula to calculate the required torque wrench reading. This formula is used in order to measure axle bearing preload rolling torque at the bolt circle.
C = ((T + SDT) x B) / (B + A)
"C" is the torque wrench reading in N·m.
"B" is the length of the torque wrench in meters.
"A" is the bolt circle radius of axle housing (2) in meters. This is equal to 0.229 m (9.016 inch).
"SDT" is the actual seal drag torque in N·m from Step 8.
"T" is the axle bearing preload rolling torque.
Axle bearing preload rolling torque "T"
- New bearings ... 9 to 16 N·m (7 to 12 lb ft)
- Used bearings ... 4.5 to 8 N·m (3.5 to 6 lb ft)
Check the assembly in order to make sure that there is zero end play of axle shaft (9) .
- New bearings ... 9 to 16 N·m (7 to 12 lb ft)
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Typical Illustration
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Illustration 7 g00353123
Typical Illustration
(F) Torque wrench and spanner wrench
- If axle bearing preload rolling torque exceeds the specification, back off nut (3) by 1/8 turn and reseat bearing cone (5) against nut (3). Perform Step 9 again.