Torque Hub Components
(1) Inner bearing cone. (2) Inner bearing cup. (3) Hub. (4) Spacer. (5) Carrier. (6) Roll pins. (7) Thrust washers. (8) Needle rollers. (9) Ring gear. (10) Spacers. (11) Plugs. (12) Planet shafts. (13) Planet gears. (14) Thrust washer. (15) Input gear. (16) Cover. (17) Spindle or output shaft. (18) Seal. (19) Outer bearing cone. (20) Outer bearing cup. (21) Retaining ring. (22) O-rings. (23) Thrust washer. (24) Standard bolts. (25) Shoulder bolts.
Disassemble Torque Hub
Reference: When torque specifications for nuts and bolts are not given in these instructions, standard torques should be used. See Torque Specifications module, Form No. SENR3130.
Reference: Be sure to follow correct safety practices when performing procedures covered in this module. See Safety Page, Form No. SENR7733.
NOTE: Clean the outside of the torque hub thoroughly before starting disassembly. Perform disassembly and assembly in a clean work area to prevent contaminants from entering the torque hub.
1. Make matching scribe marks on cover (16), ring gear (9), and hub (3). This will help ensure that these parts are reassembled in their original positions.
2. Remove one or more plugs (11) to drain lubricant from the torque hub. Replace the plug after lubricant has drained.
NOTE: Cover (16) is secured to the torque hub with eight standard bolts (24) and four shoulder bolts (25). These bolts are positioned in the cover as shown above.
3. Remove eight standard bolts (24) from cover (16).
4. Remove four shoulder bolts (25) from cover (16).
5. Remove cover (16), one o-ring (22), and two thrust washers (23) and (14) off the torque hub. Discard o-ring (22). This must be replaced with a new part during assembly.
6. Remove input gear (15).
7. Remove ring gear (9) and remaining o-ring (22). Discard o-ring (22). This must be replaced with a new part during assembly.
8. Remove carrier (5).
9. Place a bearing cone pressing tool on top of retaining ring (21) inside the hub.
10. Press the tool with a hydraulic ram or by striking with a soft face hammer. Pressure should be applied until hub (3) rotates with difficulty. This step is necessary to remove the preload against retaining ring (21).
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Wear safety glasses to prevent injury from possible flying parts during the following step. |
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11. Use retaining ring pliers to remove retaining ring (21). Remove spacer (4) Discard retaining ring (21). This must be replaced with a new part during assembly.
12. Press spindle or output shaft (17) out of hub (3).
13. Pull outer bearing cone (19) out of hub (3).
14. Pull inner bearing cone (1) and seal (18) off spindle or output shaft (17). Discard seal (18). This must be replaced with a new part during assembly.
15. Press two bearing cups (2) and (20) out of hub (3).
16. Drive roll pin (6) out of one of the planet shafts (12).
17. Remove planet shaft (12) from carrier (5) and planet gear (13).
18. Remove planet gear (13) and two thrust washers (7) from the carrier.
19. Remove two rows of needle rollers (8) and one spacer (10) from the bore of the planet gear.
20. Repeat steps 16 through 19 for the remaining two planet gears.
21. Wash all parts in clean solvent. Dry parts thoroughly and inspect for damage or excessive wear. Replace parts as necessary before assembly.
Assemble Torque Hub
Reference: When torque specifications for nuts and bolts are not given in these instructions, standard torques should be used. See Torque Specifications module, Form No. SENR3130.
Reference: Be sure to follow correct safety practices when performing procedures covered in this module. See Safety Page, Form No. SENR7733.
1. Apply a coat of grease inside the bore of one planet gear (13). This will hold needle rollers (8) in place during assembly.
2. Install the first row of 16 needle rollers (8) into the bore of the planet gear.
3. Set spacer (10) into the bore of planet gear (13) on top of the needle rollers.
4. Install a second row of 16 needle rollers (8) into the bore of the planet gear.
5. Apply grease to the tang side of two thrust washers (7). Place the thrust washers against bosses in carrier (5). Washer tangs must fit into slots in carrier's outside diameter.
6. When thrust washers (7) are in place, slide planet gear (13) between them. Line up the planet gear bore with the hole in the carrier.
7. Install one planet shaft (12) through the carrier and planet gear assembly. Line up the roll pin hole in the planet shaft with the carrier roll pin hole.
8. Drive roll pin (6) into the carrier hole, locking the planet shaft in place. Make sure the roll pin is driven at least flush with the carrier.
9. Repeat steps 1 through 8 for the remaining two planet gears.
10. If the torque hub uses a spindle (17), as shown above, prepare for assembly as follows:
a. Apply a light film of oil to a new seal (18).
b. Press the seal onto the spindle shoulder so that the closed end of the seal faces the spindle drive plate. Make sure the seal is installed square with the spindle.
c. Press inner bearing cone (1) onto spindle (17).
11. If the torque hub uses an output shaft (17), as shown above, press inner bearing cone (1) onto the output shaft. Seal (18) will be installed in a later step.
12. Press inner bearing cup (2) and outer bearing cup (20) in place inside hub (3).
13. Carefully raise hub (3) and set in place on spindle or output shaft (17). Use care to prevent damaging seal (18), if installed.
14. Press outer bearing cone (19) on spindle or output shaft (17) inside hub (3). Rotate the hub while pressing the bearing. Stop pressing when the hub starts to resist rolling.
15. Install spacer (4) so that it rests on top of outer bearing cone (19).
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Wear safety glasses to prevent injury from possible flying parts during the following step. |
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16. Use retaining ring pliers to install a new retaining ring (21) into the groove on the spindle or output shaft. Use a soft punch against the retaining ring to be sure it is seated.
17. Apply a light coat of grease to one new o-ring (22). Install the o-ring into the counter-bore of hub (3).
18. Install carrier (5) into the torque hub. Make sure the internal spline of the carrier engages the spline of the spindle or output shaft inside the hub.
19. Slide ring gear (9), with the shoulder side toward the hub, into mesh with the planet gears. Be sure to align the scribe marks made during disassembly.
20. Slide input gear (15) into mesh with the planet gears inside the carrier until it rests against the shoulder.
21. Place small thrust washer (23) over the input gear.
22. Apply grease to one side of large thrust washer (14). Place the thrust washer on the counter-bore of carrier (5) with the greased side facing the torque hub cover.
23. Apply a light coat of grease to the second new o-ring (22). Install the o-ring into the counter-bore of cover (16).
24. Install cover (16) to the torque hub. Be sure to align the scribe marks made during disassembly.
25. Install four shoulder bolts (25) into the torque hub cover as shown. Tighten the bolts to 31 to 36 N·m (23 to 27 lb.ft.).
26. Install eight standard bolts (24) into the torque hub cover as shown. Tighten the bolts to 31 to 36 N·m (23 to 27 lb.ft.).
27. If the torque hub uses an output shaft (17), as shown above, install a new seal (18) as follows:
a. Apply a light film of oil to a new seal (18).
b. Orient the seal so the closed end faces out. Tap the seal into place so it is flush with the hub.
28. Refill the torque hub with lubricant. See the Operation and Maintenance Manual for lubricant information.