The following procedure shows the differential backlash and differential bearing preload settings for the rear axle. Adjust the differential backlash and bearings for the axle according to the following procedure.
Reference: For information regarding the removal and installation of the differential, refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Remove" and Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Install" for your machine.
Table 1 provides a list of the required tools. The tools are required to carry out the adjustment of the differential backlash and the differential bearings for the front axle.
| Required Tools | |||
|---|---|---|---|
| Tooling | Part Number | Description | Qty |
| A | 8T-5096 | Dial Indicator Group | 1 |
| B | 5P-3520 | Wrench | 1 |
| C | 9U-5017 | Torque Wrench | 1 |
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Assemble".
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
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When testing and adjusting the transmission and power train, move the machine to an area clear of obstructions, with safe exhaust ventilation for the exhausts. Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, do the procedure that follows before testing and adjusting the transmission and power train. |
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Assemble".
- Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in the sight of the operator.
- Move the transmission control to the NEUTRAL position.
- Lower the boom. If equipped, lower the work tool to the ground.
- Engage the parking brake and stop the engine.
- If the machine is in a confined area, ensure that exhaust gases are vented to the outside when the engine is operated.
- Make sure that all the oil pressure is released before you perform any of the following procedures:
- Loosen any fitting, any hose, or any component.
- Tighten any fitting, any hose, or any component.
- Remove any fitting, any hose, or any component.
- Adjust any fitting, any hose, or any component.
- Remove the differential. Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Remove".
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Dissemble".
Start By:
- Determining and installing the correct pinion shims. Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Assemble".
- Support the differential assembly in a fixture.
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Illustration 2 g01427630 Typical Example - Set the pinion rotating torque. Tighten the pinion nut to achieve a rotation torque between
2 N·m (18 lb in) and2.4 N·m (21 lb in) .Show/hide table
Illustration 3 g01427215 - Install tooling (A) on the center housing. Position the contact point (plunger) of the dial indicator on the mark that corresponds to the outer radius of the bevel gear. Zero the dial indicator.
- Hold the pinion gear stationary while you rotate the tool back and forth to measure the bevel gear backlash. The bevel gear backlash is the total deflection of the dial indicator. Take further measurements at three equally spaced positions to establish an average backlash. The backlash should be between
0.25 mm to 0.33 mm (0.0098 inch to 0.0130 inch) .Show/hide table
Illustration 4 g01427219 - Use tooling (B) to tighten each nut until slight resistance is felt. Strike both sides of the assembly with a soft mallet to seat the bearings. Repeat this process until the rolling resistance begins to increase.
- If, the measurement is not within the specification adjust nuts (6) and (12). Back off nut (6) and tighten nut (12) by the same amount to increase the backlash. Back off nut (12) and tighten nut (6) by the same amount to decrease the backlash. Adjusting the nuts by the same amount will maintain the correct rolling resistance.
- Use tooling (C) to remeasure the rolling resistance. The total rolling resistance should be
0.69 ± 0.14 N·m (6.11 ± 1.24 lb in) more than the previously measured pinion rolling torque. - When the backlash and the rolling resistance are within the specification, check the tooth contact pattern.
- Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Assemble"
- Install the differential. Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Rear) - Install"
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| Illustration 1 | g01427183 |
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Differential and Bevel Gear (Rear Axle) (2) Bevel gear (4) Cup (bearing) (5) Cone (bearing) (6) Nut (7) Retainer (8) Bolt (9) Bolt (10) Center housing (11) Case (differential) (12) Nut (13) Cone (bearing) (14) Cup (bearing) | |
The following procedure controls the differential backlash and differential bearings preload settings for the front axle. Adjust the differential backlash and bearings for the axle according to the following procedure.
Table 2 provides a list of the tools that are required. Use the tools to carry out the adjustment of the differential backlash and the differential bearings for the front axle.
| Required Tools | |||
| Tool | Part Number | Description | Qty |
| A | 8T-5096 | Dial Indicator Group | 1 |
| B | 235-2797 | Spanner Socket | 1 |
| C | 9U-5017 | Torque Wrench | 1 |
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Assemble".
| NOTICE |
|---|
|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
|
|
When testing and adjusting the transmission and power train, move the machine to an area clear of obstructions, with safe exhaust ventilation for the exhausts. Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, do the procedure that follows before testing and adjusting the transmission and power train. |
- Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in the sight of the operator.
- Move the transmission control to the NEUTRAL position.
- Lower the boom. If equipped, lower the work tool to the ground.
- Engage the parking brake and stop the engine.
- If the machine is in a confined area, ensure that exhaust gases are vented to the outside when the engine is operated.
- Make sure that all the oil pressure is released before you perform any of the following procedures:
- Loosen any fitting, any hose, or any component.
- Tighten any fitting, any hose, or any component.
- Remove any fitting, any hose, or any component.
- Adjust any fitting, any hose, or any component.
- Remove the differential. Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Remove"
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Dissemble".
Reference: Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Assemble".
- Support the differential in a fixture.
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Illustration 6 g01427630 Check the rolling resistance of the differential. - Use Tooling (B) with a dial type torque wrench to set the rotating torque. Tighten the pinion nut to achieve a rotating torque between
1.81 N·m (16 lb in) and2.60 N·m (23 lb in) .Show/hide table
Illustration 7 g01427622 - Install nuts (5) and (9). Use tooling (B) to tighten each nut until slight resistance is felt. Oscillate the pinion shaft and use Tooling (B) to advance spanner nuts (5) and (9). Advance the nuts until there is slight backlash and no end play on the bearings.
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Illustration 8 g01427630 Check the rolling resistance of the differential. - Use a dial type torque wrench and measure the total rotating torque. Use the following formula to calculate the total rotating torque (TRT): P equals the rotating torque that was measured in Step 2. TRT = P + 0.3819 N·m (3.38 lb in) to P + 0.4406 N·m (3.90 lb in)
- If the total rotating torque (TRT) is less than the specified amount, tighten the spanner nuts. If the total rotating torque (TRT) is greater than the specified amount, loosen the spanner nuts. Be sure to maintain a slight backlash.
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Illustration 9 g01427626 Measuring Pinion Backlash - Install tooling (A). Position the contact point (plunger) at 90 degrees to one of the bevel gear teeth. Adjust the dial indicator so that the contact point (plunger) is just in contact with the tooth. Zero the dial indicator. Hold the pinion gear stationary and rotate the bevel gear back and forth to measure the backlash. The bevel gear backlash is the total deflection of the dial indicator. Use tooling (B) to tighten nuts (5) and (9) by equal amounts until the measured backlash is between
0.18 to 0.23 mm (0.007 to 0.906 inch) .Show/hide table
Illustration 10 g01427633 - If the backlash is not within the specification, retract one spanner nut and advance the opposite spanner nut equally. This method will maintain the bearing preload. If the backlash is less than the specified amount, move the bevel gear in Direction (A). If the backlash is greater than the specified amount, move the bevel gear in Direction (B).
- When the backlash and the rolling resistance are within the specification, check the tooth contact pattern.
- Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Assemble" for assembly.
- Install the differential. Refer to Disassembly and Assembly, UENR0265, "450E Backhoe Loader Power Train", "Axle Housing (Differential and Bevel Gear) (Front) - Install"
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| Illustration 5 | g01427194 |
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Differential and Bevel Gear (Rear Axle) (1) Bevel gear (2) Bolt (3) Cup (bearing) (4) Cone (bearing) (5) Nut (6) Bolt (7) Retainer (8) Case (9) Nut (10) Cone (bearing) (11) Cup (bearing) | |
The correct tooth contact between the pinion gear and the bevel gear in important. The correct tooth contact will help prevent excessive wear of the gear teeth.
Check the tooth contact pattern according to the following procedure:
- Apply marking compound (Prussian blue) to the teeth of bevel gear (2). Rotate pinion gear (1) clockwise and counterclockwise until all the teeth on the bevel gear come into contact with the pinion gear in both directions. Refer to lustration 11 and check the tooth contact pattern of the bevel gear and pinion gear (bevel gear set).
- Adjust the position of the bevel gear or adjust the position of the pinion gear to achieve optimum tooth contact.
- To move bevel gear (2) toward pinion gear (1), adjust the nuts that are used to establish correct backlash. Adjust the nuts by the same amount to maintain the correct backlash and rolling resistance.
- To move bevel gear (2) away from pinion gear (1), adjust the nuts that are used to establish correct backlash. Adjust the nuts by the same amount to maintain the correct backlash and rolling resistance.
- To move pinion gear (1) toward bevel gear (2), an adjustment must be made. The adjustment must be made to the thickness of the shim that is used to establish the correct depth of the pinion gear. Refer to Systems Operation, Testing, and Adjusting, "Differential Pinion Bearing - Adjust".
- To move pinion gear (1) away from bevel gear (2), an adjustment must be made. The adjustment must be made to the thickness of the shim that is used to establish the correct depth of the pinion gear. Refer to Systems Operation, Testing, and Adjusting, "Differential Pinion Bearing - Adjust".
- Clean the marking compound from the bevel gear and pinion gear. Recheck the backlash and the rolling resistance.
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| Illustration 11 | g00729328 |
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Examples of Incorrect Tooth Contact Patterns The illustration gives an indication of possible bevel gear or pinion gear movements to achieve correct tooth contact. | |
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| Illustration 12 | g00797650 |
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(1) Pinion gear
(2) Bevel gear | |