3979294 KIT-SEAL Caterpillar parts
320D, 320D FM, 320D2, 320D2 L, 320E, 320E L, 320E LN, 320E LRR, 320E RR, 323D L, 323E L, 324D L, 325D L, 330D L, 336D L, 345C L, M325D L MH, M325D MH
Rating:
Alternative (cross code) number:
CA3979294
397-9294
3979294
CA3979294
397-9294
3979294
Weight: 0.43 pounds 0 kg.
EXCAVATOR,
You can buy:
US$49.89
15 Jul 2025
FridayParts
Compare Prices: .
As an associate, we earn commssions on qualifying purchases through the links below
Compatible with E324D Seal Kit 3979294 Excavator Part (324D)
Generic Precision Fitment:Direct replacement. Please match the part number instead of images due to packaging updates. || Extreme Durability:Actual items shipped strictly follow P/N specifications. || Leak-Proof Guarantee:Parts are tested on-vehicle and validated to ensure optimal performance on the road. || Multi-scenario compatible: Works with gasoline, diesel, and biofuel systems. Resists oil, coolant, and ethylene glycol degradation. || Important: Always verify the part number in the product title before ordering. Product images are for illustrative purposes only. Shipments are strictly based on the specified part number, not visual references.
Generic Precision Fitment:Direct replacement. Please match the part number instead of images due to packaging updates. || Extreme Durability:Actual items shipped strictly follow P/N specifications. || Leak-Proof Guarantee:Parts are tested on-vehicle and validated to ensure optimal performance on the road. || Multi-scenario compatible: Works with gasoline, diesel, and biofuel systems. Resists oil, coolant, and ethylene glycol degradation. || Important: Always verify the part number in the product title before ordering. Product images are for illustrative purposes only. Shipments are strictly based on the specified part number, not visual references.
Compatible with E324D Seal Kit 3979294 Excavator Part (320B)
Generic Precision Fitment:Direct replacement. Please match the part number instead of images due to packaging updates. || Extreme Durability:Actual items shipped strictly follow P/N specifications. || Leak-Proof Guarantee:Parts are tested on-vehicle and validated to ensure optimal performance on the road. || Multi-scenario compatible: Works with gasoline, diesel, and biofuel systems. Resists oil, coolant, and ethylene glycol degradation. || Important: Always verify the part number in the product title before ordering. Product images are for illustrative purposes only. Shipments are strictly based on the specified part number, not visual references.
Generic Precision Fitment:Direct replacement. Please match the part number instead of images due to packaging updates. || Extreme Durability:Actual items shipped strictly follow P/N specifications. || Leak-Proof Guarantee:Parts are tested on-vehicle and validated to ensure optimal performance on the road. || Multi-scenario compatible: Works with gasoline, diesel, and biofuel systems. Resists oil, coolant, and ethylene glycol degradation. || Important: Always verify the part number in the product title before ordering. Product images are for illustrative purposes only. Shipments are strictly based on the specified part number, not visual references.
Compatible equipment models: 3979294:
Information:
The probable root causes are listed in order below:Note: If the problem is intermittent and the problem cannot be duplicated, refer to Troubleshooting, "Power Is Intermittently Low or Power Cutout Is Intermittent".Note: If the problem only occurs under certain conditions, test the engine under those conditions. Examples of certain conditions are high rpm, full load and engine operating temperature. Troubleshooting the symptoms under other conditions can give misleading results.Probable Causes
Diagnostic codes
Fuel supply
Cold mode operation and cold cylinder cutout
Throttle
Air intake and exhaust system
Cylinder performance
Electrical connectors
Electronic unit injectors
GovernorRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.Fuel Supply
Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the engine has been run out of fuel, it will be necessary to purge the air from the fuel system. Refer to Operation and Maintenance Manual for more information.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Check the fuel lines for the following problems: restrictions, collapsed lines, pinched lines and loose connections. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Prime the fuel system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsNote: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Systems Operation/Testing and Adjusting.
Check the fuel tank for foreign objects which may block the fuel supply.
Check the fuel filters.
Check the diesel fuel for contamination. Refer to Systems Operation/Testing and Adjusting.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. Cold Mode Operation and Cold Cylinder Cutout
Use Cat ET in order to verify that the engine has exited cold mode. During cold mode, fuel injection timing is modified. When the engine is in cold mode, the cold cylinder cutout strategy may be active. Cold mode cylinder cutouts may cause variations in vibration and available power. This is normal operation.Throttle
There may be a problem with the throttle. Refer to Troubleshooting, "Speed Control - Test".Air Intake and Exhaust System
Check the air filter restriction indicator, if equipped. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting. Cylinder Performance
Check the valve lash and reset the valve lash, if necessary. Refer to Systems Operation/Testing and Adjusting.
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder. Refer to Disassembly and Assembly.
Possible causes of low compression are
Diagnostic codes
Fuel supply
Cold mode operation and cold cylinder cutout
Throttle
Air intake and exhaust system
Cylinder performance
Electrical connectors
Electronic unit injectors
GovernorRecommended Actions
Diagnostic Codes
Check for active diagnostic codes on Caterpillar Electronic Technician (ET). Troubleshoot any active codes before continuing with this procedure.Fuel Supply
Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the engine has been run out of fuel, it will be necessary to purge the air from the fuel system. Refer to Operation and Maintenance Manual for more information.
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Check the fuel lines for the following problems: restrictions, collapsed lines, pinched lines and loose connections. If problems are found with the fuel lines, repair the lines and/or replace the lines.
Prime the fuel system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsNote: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Systems Operation/Testing and Adjusting.
Check the fuel tank for foreign objects which may block the fuel supply.
Check the fuel filters.
Check the diesel fuel for contamination. Refer to Systems Operation/Testing and Adjusting.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. Cold Mode Operation and Cold Cylinder Cutout
Use Cat ET in order to verify that the engine has exited cold mode. During cold mode, fuel injection timing is modified. When the engine is in cold mode, the cold cylinder cutout strategy may be active. Cold mode cylinder cutouts may cause variations in vibration and available power. This is normal operation.Throttle
There may be a problem with the throttle. Refer to Troubleshooting, "Speed Control - Test".Air Intake and Exhaust System
Check the air filter restriction indicator, if equipped. Clean plugged air filters or replace plugged air filters. Refer to the Operation and Maintenance Manual.
Check the air inlet and exhaust system for restrictions and/or leaks. Refer to Systems Operation/Testing and Adjusting. Cylinder Performance
Check the valve lash and reset the valve lash, if necessary. Refer to Systems Operation/Testing and Adjusting.
Check for correct installation of the unit injector connectors. Check for correct installation of all other applicable connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform the "Cylinder Cutout Test" on Cat ET in order to identify any injectors that might be misfiring.
If Cat ET indicates a problem, remove the electronic unit injector from the suspect cylinder. Refer to Disassembly and Assembly.
Possible causes of low compression are
Caterpillar parts catalog:
Parts kit Caterpillar catalog:
2344587
KIT-SEAL
320D, 320D FM, 320D L, 323D L, 323D LN, 323D SA, 325D, 325D L, 328D LCR, 329D, 329D L
320D, 320D FM, 320D L, 323D L, 323D LN, 323D SA, 325D, 325D L, 328D LCR, 329D, 329D L
2590656
KIT-SEAL
320D, 320D L, 323D L, 323D LN, 323D SA, 325D, 325D L, 328D LCR, 329D, 329D L
320D, 320D L, 323D L, 323D LN, 323D SA, 325D, 325D L, 328D LCR, 329D, 329D L
2668045
KIT-SEAL
320D, 320D L, 323D L, 325D L, 329D, 329D L
320D, 320D L, 323D L, 325D L, 329D, 329D L
2344576
KIT-SEAL
320D, 320D L, 320E L, 325D, 325D L, 328D LCR, 329D, 329D L
320D, 320D L, 320E L, 325D, 325D L, 328D LCR, 329D, 329D L
3500975
KIT-SEAL
320D, 320D L, 320D2, 320D2 L, 320E, 320E L, 320E LN, 325D, 325D L, 328D LCR, 329D, 329D L, 329E, 329E L, 329E LN
320D, 320D L, 320D2, 320D2 L, 320E, 320E L, 320E LN, 325D, 325D L, 328D LCR, 329D, 329D L, 329E, 329E L, 329E LN
3500974
KIT-SEAL
320D, 320D L, 320E, 320E L, 320E LN, 325D, 325D L, 328D LCR, 329D, 329D L
320D, 320D L, 320E, 320E L, 320E LN, 325D, 325D L, 328D LCR, 329D, 329D L
3319328
KIT-SEAL
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 365C L MH, 374D L, 374F L, 385C L MH
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 365C L MH, 374D L, 374F L, 385C L MH
2254625
KIT-SEAL
324D, 330D, 330D L, 330D LN, 330D MH, 336D, 336D L, 340D L, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E L, 349E L VG, 365B, 365C
324D, 330D, 330D L, 330D LN, 330D MH, 336D, 336D L, 340D L, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E L, 349E L VG, 365B, 365C
3338750
KIT-SEAL
324D, 329D LN, 330D, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 336D2, 336D2 L, 336E, 336E L, 336E LN, 336F L, 340D L, 340D2 L, 345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E...
324D, 329D LN, 330D, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 336D2, 336D2 L, 336E, 336E L, 336E LN, 336F L, 340D L, 340D2 L, 345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E...
2316844
KIT-SEAL
324D, 325C, 325D L, 330C, 330C L, 330D, 330D FM, 330D L, 330D LN, 336D, 336D L, 340D L, 385C L
324D, 325C, 325D L, 330C, 330C L, 330D, 330D FM, 330D L, 330D LN, 336D, 336D L, 340D L, 385C L
2304001
KIT-SEAL
330C, 330C L, 330D, 330D L, 330D LN, 336D L
330C, 330C L, 330D, 330D L, 330D LN, 336D L
2042721
KIT-SEAL
330C, 345B II, 345B L, 350, M325C MH, M325D L MH
330C, 345B II, 345B L, 350, M325C MH, M325D L MH
3333717
KIT-SEAL
1190, 1190T, 2290, 2390, 2391, 2491, 2590, 511, 521, 522, 532, 541, 551, 552
1190, 1190T, 2290, 2390, 2391, 2491, 2590, 511, 521, 522, 532, 541, 551, 552
2673856
KIT-SEAL
325D MH, 330D MH, 345C, 345C MH, M325D L MH, M325D MH, M330D, W345C MH
325D MH, 330D MH, 345C, 345C MH, M325D L MH, M325D MH, M330D, W345C MH
3479481
KIT-PUMP
330D, 330D FM, 330D L, 330D MH, 345C, 345C L, 345C MH, W345C MH
330D, 330D FM, 330D L, 330D MH, 345C, 345C L, 345C MH, W345C MH
3799497
KIT-SEAL
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 349F L
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 349F L
2159995
KIT-SEAL
345C, 365B, 365B II, 365B L, 365C, 365C L, 365C L MH, 385B, 385C, 385C L, 390D, 390D L
345C, 365B, 365B II, 365B L, 365C, 365C L, 365C L MH, 385B, 385C, 385C L, 390D, 390D L
3319328
KIT-SEAL
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 365C L MH, 374D L, 374F L, 385C L MH
345B II, 345C, 345C L, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L VG, 365C L MH, 374D L, 374F L, 385C L MH
2645285
KIT-SHIM
525C, 525D, 535C, 535D, 545C, 545D, 555D
525C, 525D, 535C, 535D, 545C, 545D, 555D
3576032
KIT-WINDOW REPAIR
525C, 535C, 545C
525C, 535C, 545C
3576031
KIT-LATCH
525C, 535C, 545C
525C, 535C, 545C
4508233
KIT-LEVER
525C, 535C, 545C
525C, 535C, 545C
2566151
KIT-SEAL
525C, 535C, 545C
525C, 535C, 545C
3087841
KIT-SEAL
525C, 535C, 545C
525C, 535C, 545C