8F7421 GEAR (19 teeth) Caterpillar parts
120B, 12E, 140, 140B
Rating:
Alternative (cross code) number:
CA8F7421
8F-7421
8F7421
CA8F7421
8F-7421
8F7421
Weight: 2 pounds 0 kg.
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8F7421 Worm Gear fits Caterpillar 120B 140B 120 12E 140
ZBOX 【FITMENT MODELS】 Fits Caterpillar 120B - 140B - 120 - 12E - 140 || 【AMERICAN OWNED & OPERATED】Fully owned and operated within the United States, our business is dedicated to contributing to local economies, supporting American jobs, and fostering community growth. || 【QUALITY REPLACEMENT】Engineered for durability and performance, our parts meet or exceed OEM specifications. Ideal for construction and agriculture machinery, ensuring reliability and efficiency in tough working conditions. || 【PACK SIZE】This product is a pack of 1, making it easy to stock up and ensure you have the necessary parts on hand for maintenance.
ZBOX 【FITMENT MODELS】 Fits Caterpillar 120B - 140B - 120 - 12E - 140 || 【AMERICAN OWNED & OPERATED】Fully owned and operated within the United States, our business is dedicated to contributing to local economies, supporting American jobs, and fostering community growth. || 【QUALITY REPLACEMENT】Engineered for durability and performance, our parts meet or exceed OEM specifications. Ideal for construction and agriculture machinery, ensuring reliability and efficiency in tough working conditions. || 【PACK SIZE】This product is a pack of 1, making it easy to stock up and ensure you have the necessary parts on hand for maintenance.
Reliable Aftermarket Parts Our Name Says It All 8F7421 Fits Caterpillar Worm Gear fits Several Models
Reliable Aftermarket Parts Our Name Says It All One New Aftermarket Replacement Worm Gear That Fits Caterpillar Models. Replaces Part Number: Enp70- || OEM Numbers Are Provided for Reference Only. Please Verify Fit Prior To Ordering. || Please Note: Some Listings Use Stock Images for Reference and May Differ from the Actual Product. || This Aftermarket Part Is Made to Meet or Exceed Manufacturer (OEM) Specifications.
Reliable Aftermarket Parts Our Name Says It All One New Aftermarket Replacement Worm Gear That Fits Caterpillar Models. Replaces Part Number: Enp70- || OEM Numbers Are Provided for Reference Only. Please Verify Fit Prior To Ordering. || Please Note: Some Listings Use Stock Images for Reference and May Differ from the Actual Product. || This Aftermarket Part Is Made to Meet or Exceed Manufacturer (OEM) Specifications.
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Information:
Always verify fuel dilution. Ask the Caterpillar dealer to submit an oil sample to a Caterpillar regional SOS laboratory for analysis.Note: For additional information, refer to Special Instruction, REHS3007, "Determining the Cause of Fuel Dilution of Engine Oil".Probable Causes
Leaking seals
Fuel injector tip
Fuel transfer pump seal
Cracked cylinder headRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Leaking Seals
A. Remove the injector from the affected cylinder and visually inspect the injector O-ring seals for damage.
If leakage is found and the O-rings are in good repair, there may be a problem with the injector. Replace the injector. Ensure that the new trim files are installed. Refer to Troubleshooting, "Injector Trim File - Install" for details. Use Caterpillar Electronic Technician (ET) to perform a "Fuel System Verification Test". Refer to Troubleshooting, "Injector Solenoid - Test" for details.
If the leakage is not located, add the appropriate dye to the fuel tanks. Run the engine at high idle for several minutes. Shut down the engine and remove the valve covers. Use a black light to check for traces of dye around each injector.
O-ring seal
Result: The injector O-ring seal is damaged.
Replace the damaged seals. Install the injector onto the engine and confirm that the repair has resolved the problem.
Result: The injector O-ring seal is not damaged.
Proceed to Test Step 2.
2. Fuel Injector Tip
A. Use Cat ET to perform the "Cylinder Cutout Test" in order to identify any cylinders that may be overfueled.
B. A fuel injector tip that is broken or fractured is a possible cause of a cylinder that is being overfueled. If a cylinder is identified by the test, Remove the injector and check the injector tip for damage. Check the fuel injector tip for cracks or breakage.
Injector tip
Result: The fuel injector tip is damaged.
Replace the suspect injector.
Result: The fuel injector tip is not damaged.
Proceed to Test Step 3.
3. Fuel Transfer Pump Seal
A. Check for fuel leakage around the shaft seal for the fuel transfer pump. Ensure that the weep hole is not plugged.
Pump seal
Result: There is fuel leakage around the shaft seal.
Replace the fuel transfer pump.
Result There is not fuel leakage around the shaft seal.
Proceed to Test Step 4.
4. Cracked Cylinder Head
A. Look for signs of damage to the internal passages for the fuel supply to the injectors in the cylinder head. Check for pin hole leaks. Refer to Disassembly and Assembly.
Cracked head
Result The internal passages for the fuel supply to the injectors are damaged.
Repair or replace the cylinder head.
Complete the procedure in the order in which the steps are listed.
Leaking seals
Fuel injector tip
Fuel transfer pump seal
Cracked cylinder headRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Leaking Seals
A. Remove the injector from the affected cylinder and visually inspect the injector O-ring seals for damage.
If leakage is found and the O-rings are in good repair, there may be a problem with the injector. Replace the injector. Ensure that the new trim files are installed. Refer to Troubleshooting, "Injector Trim File - Install" for details. Use Caterpillar Electronic Technician (ET) to perform a "Fuel System Verification Test". Refer to Troubleshooting, "Injector Solenoid - Test" for details.
If the leakage is not located, add the appropriate dye to the fuel tanks. Run the engine at high idle for several minutes. Shut down the engine and remove the valve covers. Use a black light to check for traces of dye around each injector.
O-ring seal
Result: The injector O-ring seal is damaged.
Replace the damaged seals. Install the injector onto the engine and confirm that the repair has resolved the problem.
Result: The injector O-ring seal is not damaged.
Proceed to Test Step 2.
2. Fuel Injector Tip
A. Use Cat ET to perform the "Cylinder Cutout Test" in order to identify any cylinders that may be overfueled.
B. A fuel injector tip that is broken or fractured is a possible cause of a cylinder that is being overfueled. If a cylinder is identified by the test, Remove the injector and check the injector tip for damage. Check the fuel injector tip for cracks or breakage.
Injector tip
Result: The fuel injector tip is damaged.
Replace the suspect injector.
Result: The fuel injector tip is not damaged.
Proceed to Test Step 3.
3. Fuel Transfer Pump Seal
A. Check for fuel leakage around the shaft seal for the fuel transfer pump. Ensure that the weep hole is not plugged.
Pump seal
Result: There is fuel leakage around the shaft seal.
Replace the fuel transfer pump.
Result There is not fuel leakage around the shaft seal.
Proceed to Test Step 4.
4. Cracked Cylinder Head
A. Look for signs of damage to the internal passages for the fuel supply to the injectors in the cylinder head. Check for pin hole leaks. Refer to Disassembly and Assembly.
Cracked head
Result The internal passages for the fuel supply to the injectors are damaged.
Repair or replace the cylinder head.
Complete the procedure in the order in which the steps are listed.
Caterpillar parts catalog:
Parts gear Caterpillar catalog:
120, 120B, 12E, 140, 140B
120, 120B, 12E, 140, 140B
12E, 140
12E, 140
120, 120B, 12E, 140, 140B
120B, 12E
120B, 12E, 14E
120B, 12E, 140, 140B
120B, 12E, 140, 140B
4545238
GEAR
MH3059
MH3059
4545231
GEAR
MH3059
MH3059
3959646
GEAR
MH3049
MH3049
3959624
GEAR
MH3049
MH3049
3F0018
GEAR (30T)
120B, 12E, 12F, 140, 140B, 14E
120B, 12E, 12F, 140, 140B, 14E
120B, 12E, 12F, 140, 140B, 14E
120B, 12E, 12F, 140, 140B, 14E
4D2169
GEAR (33T)
120B, 12E, 12F, 140, 140B, 14E
120B, 12E, 12F, 140, 140B, 14E
12F, 140, 140B, 14E
120B, 140B