The crankshaft seal is the primary barrier that keeps oil from leaking from the rear or front end of the crankshaft. Over time, crankshaft seals can dry out, break, or wear a groove into the crankshaft, allowing oil to leak.

Some CTP crankshaft seals come with a steel wear sleeve which creates a new surface for the seal. These seals/sleeves combination is pressed on the crankshaft at the same time, specialty tools are required for the installation. Many new seals are PTFE (polytetrafluoroethylene) type. PTFE seals provide low friction sealing with minimal oil lubrication requirement.

PTFE Installation tips:

  • To protect the seal from dust and other contamination, only remove the seal from the protective packaging at the time of installation.
  • The sealing lip of a PTFE oil seal is protected by a plastic sleeve, which sometimes can be used as an assembly aid. The sleeve protective sleeve must remain in place until the seal has been installed.
  • Both the PTFE sealing lip and the shaft surface must be completely dry. Do not use any grease or oil.
  • The shaft surface must be in a perfect condition in order to have a good running seal surface. Do not start the engine sooner than a couple of hours after installation, this allows the new sealing lip to adapt properly to the shaft.

Caution: If the sealing surface has a wear groove, the seal lip of the new seal should not run in the same position as the old seal.

CRANKSHAFT SEALS

PART NO.DESCRIPTIONENGINEAPPLICATION
1005421SEAL GP-CRANKSHAFT (REAR)3176, 3176B, 3176C, 3196, C-10, C-12, C-15, C-16, C11, C13, C15, C1814M, 16M, 3176, 3176B, 3176C, 3196, 345D L, 349D, 349D L, 349E, 349E L, 572R II, 980K, 980K HLG, 980M, 982M, CPT372, CX31-C13I, CX31-C15I, CX31-C18I, CX35-C
1138432SEAL GP-CRANKSHAFT (CLOCKWISE ROTATION)3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C5130, 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793B, 793C, 793D, 797
1138433SEAL GP-CRANKSHAFT (COUNTERCLOCKWISE ROTATION)3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C5130, 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784B, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793B, 793C, 793D, 797
1175015SEAL AS-OIL (REAR)3044C236B, 236B3, 242B3, 246C, 252B, 252B3, 256C, 257B3, 259B3, 262C, 262C2, 267B, 268B, 272C, 277C, 277C2, 279C, 279C2, 287C, 287C2, 289C, 289C2, 297C, 299C, 303.5C, 303.5D, 303C CR, 304C CR, 304D
1260110SEAL GP (REAR)3176B, 3176C, 3196, C-10, C-12345B, 345B II, 345B II MH, 345B L, 365B, 365B L, 480, 65E, 75C, 75D, 75E, 85C, 85D, 85E, 95E, D7R II, R1600, R1600G, R1700G, W345B II
1425867SEAL CRANKSHAFT (FRONT)3406, 3406B, 3406C, 3406E, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412D, 3412E, 345616G, 16H NA, 24H, 24M, 365C, 365C L, 365C L MH, 374D L, 374F L, 375, 375 L, 385B, 385C, 385C FS, 385C L, 385C L M
1425868SEAL CRANKSHAFT (REAR)3406, 3406B, 3406C, 3406E, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412D, 3412E, 345616G, 16H NA, 24H, 24M, 375, 375 L, 5080, 5110B, 578, 583R, 583T, 587R, 587T, 589, 621B, 621E, 621F, 621G, 621H
1438839SEAL (REAR)3054B924G, 924GZ
1441264SEAL GP-CRANKSHAFT (FRONT) (CLOCKWISE ROTATION)C-12, C13572R II, D7R II
1526556SEAL GP-CRANKSHAFT (REAR)3034216, 228, 236, 247, 248, 267, 287, 906
1526739SEAL (FRONT)3024C, 3034216, 228, 236, 247, 248, 267, 287, 906
1537978SEAL CRANKSHAFT (FRONT)3003, 3011C, 3013C, 3014, C0.5, C0.7, C1.1, C1.5, C1.6, C2.23003, 301.5, CB-14, CB-22, CB-34
1694166SEAL GP-CRANKSHAFT (FRONT)3176C, 3196140H, 143H, 14H, 14M, 160H, 163H, 16M, 345B, 345B II, 345C, 345C L, 345C MH, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L HVG, 349E L VG, 480, 621H, 621K, 623H, 623K, 623K
2099218SEAL AS (REAR)3054, 3054B, 3056, 3056E312B L, 312C, 315B L, 317, 416C, 416D, 420D, 424D, 426C, 428C, 428D, 430D, 432D, 436C, 438C, 438D, 442D, 550B, 554, 560B, 564, 574B, 908, 914G, 924G, 924GZ, 930G, AP-655C
2223909SEAL GP-CRANKSHAFT3116, 3126B322C, 324D, 325 L, 325B L, 325C, 325D, 325D L, 326D L, 329D, 329D L, 45, 55, 950F, 953B, 953C, 963B, CS-531D, CS-533D, CS-563C, CS-563D, CS-573C, CS-573D, CS-583C, CS-583D, M318, M320
2223910SEAL GP-CRANKSHAFT (REAR) (CLOCKWISE ROTATION)3126, 3126B120H, 120H ES, 120H NA, 120K, 120K 2, 12K, 135H, 135H NA, 140G, 140K, 140K 2, 160K, 322C, 322C FM, 525B, 525C, 533, 535B, 535C, 543, 545C, 561M, 561N, 613C II, 815B, 924F, 928G, 938F, 938
2264755SEAL GP-CRANKSHAFT (FRONT)3176C, 3196140H, 143H, 14H, 14M, 160H, 163H, 16H, 16M, 345B, 345B II, 345B II MH, 345B L, 345C, 345C L, 345C MH, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L HVG, 349E L VG, 349F L
2327449HOUSING-(REAR) (INCLUDES SEAL)3054C, 3054E312D2, 312D2 GC, 312D2 L, 312E, 312E L, 313D2, 313D2 LGP, 314E CR, 314E LCR, 315C, 316E L, 318D2 L, 318E L, 320D2, 320D2 GC, 320D2 L, 323D2 L, 414E, 416D, 416E, 416F, 420D, 420E, 420F
2457339SEAL-CRANKSHAFT (FRONT)3114, 3116, 3126, 3126B, 3126E120H, 120H ES, 120H NA, 120K, 120K 2, 12H, 12K, 12M, 135H, 135H NA, 140G, 140K, 140K 2, 140M, 140M 2, 160K, 160M, 160M 2, 2290, 2390, 2391, 2491, 2590, 320B, 322B L
2770116SEAL-CRANKSHAFT (REAR)C6.6, C7.1120M, 120M 2, 12M, 613G, 938H, 950K, 962K, 963D, D5R LGP, D6K LGP, D6N, D6N LGP, D6N OEM, IT38H, R1300G II
2854073SEAL GP-CRANKSHAFT (REAR)C912H, 2290, 2390, 2391, 2491, 2590, 2864C, 330C, 330C FM, 330C L, 330C MH, 330D, 330D FM, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 336D2, 336D2 L, 336E, 336E HVG, 336E L, 336E LH, 336E LN, 336F
2854074SEAL GP-CRANKSHAFT (REAR)C-9, C912H, 12M 2, 12M 3, 12M 3 AWD, 140M, 140M 2, 140M 3, 140M 3 AWD, 160M, 160M 2, 160M 3, 160M 3 AWD, 336E, 336E H, 336E L, 336E LH, 336F L, 627G, 627H, 627K, 627K LRC, 637D, 637E, 637G, 725C
2880422SEAL-OIL (FRONT)3054, 3054B, 3054C, 3054E, 3056, 3056E307, 312, 312B L, 312C, 312D2, 312D2 GC, 312D2 L, 313D2, 313D2 LGP, 315, 315B L, 315C, 317, 318D2 L, 414E, 416B, 416C, 416D, 416E, 416F, 420D, 420E, 420F, 422E
2920886HOUSING-(REAR) (INCLUDES SEAL)C6.6, C7.1120M, 120M 2, 12M, 2384C, 2470C, 2484C, 2670C, 320D GC, 320D L, 320E, 320E L, 320E LN, 320E LRR, 320E RR, 323D L, 323E L, 324E, 324E L, 324E LN, 329E, 329E L, 329E LN, 525D, 535D, 545D, 553C, 555D
3190785SEAL GP-CRANKSHAFT (REAR)3406, 3406B, 3406C, 3406E, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412D, 3412E, 345616G, 16H NA, 24H, 24M, 375, 375 L, 5080, 5110B, 578, 583R, 583T, 587R, 587T, 589, 621B, 621E, 621F, 621G, 623E
3197401SEAL GP-CRANKSHAFT (FRONT)3406, 3406B, 3406C, 3406E, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412D, 3412E, 345616G, 16H NA, 24H, 24M, 365C, 365C L, 365C L MH, 374D L, 374F L, 375, 375 L, 385B, 385C, 385C FS, 385C L, 385C L M
3244223SEAL (FRONT)3064, 3066318C, 319C, 320C, 320C FM, 320C L, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 321C, 321D LCR, 323D L, 323D LN, 323D SA
3628853SEAL GP-CRANKSHAFT (FRONT) (CLOCKWISE ROTATION)1673C, 3304, 3304B, 3306, 3306B, 3306C120G, 12G, 12H, 12H ES, 12H NA, 130G, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160G, 160H, 160H ES, 160H NA, 163H NA, 1673C, 235B, 330, 330B L, 350, 515, 517
4361478SEAL-CRANKSHAFT (CLOCKWISE ROTATION)3508C, 3512, 3516C, 793D, G3516, G3516H793D
4361479SEAL-CRANKSHAFT (COUNTERCLOCKWISE ROTATION)3508C, 3512, 3516C, 793D, G3516, G3516H3508C, 3512, 3516C, 793D, G3516, G3516H
5285683SEAL GP-CRANKSHAFT (FRONT)C9MACHINE
1W4506ADAPTER-SEAL (FRONT)1673C, 3304, 3304B, 3306, 3306B, 3306C12H, 12H ES, 12H NA, 140G, 140H, 140H ES, 140H NA, 143H, 160H, 160H ES, 160H NA, 163H NA, 611, 615C, 65C, 966F II, CB-534, D250B, D250E, D250E II, D25C, D300B
2P6224CRANKSHAFT SEAL GROUP (FRONT & REAR)1673C120G, 12G, 12H, 12H ES, 12H NA, 130G, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160H, 160H ES, 160H NA, 163H NA, 215, 215B, 215C, 215D, 219D, 225, 225D, 229, 229D, 235, 235B, 235C, 235D
2P6226CRANKSHAFT SEAL GROUP (FRONT & REAR)3306C120G, 12G, 130G, 140G, 14G, 160G, 235B, 3306C, 515, 518, 518C, 525, 528, 528B, 530B, 545, 571G, 572G, 572R, 611, 615, 615C, 627B, 627E, 627F, 627G, 637D, 637E, 637G, 639D, D4D, D4E, D4E SR, D5B, D5E
2S1509SEAL GP-CRANKSHAFT (FRONT)1674, 1676, 1693, D336, D342, D342C, D343, G343621, 631C, 657, 769, 824B, D8H, D8K
4R8831SEAL GP-CRANKSHAFT (FRONT)3116, 3126, 3126B, 3126E, C7, C930/30
4R9999EXCLUDER-CRANKSHAFT SEAL (FRONT)3116, 3126120H, 120H ES, 120H NA, 12H, 12M 2, 12M 3, 12M 3 AWD, 135H, 135H NA, 140G, 140M, 140M 2, 140M 3, 140M 3 AWD, 160M, 160M 2, 160M 3, 160M 3 AWD, 2290, 2390, 2391, 2491, 2590, 2864C, 30/30
4W0452SEAL GP-CRANKSHAFT (REAR) (COUNTERCLOCKWISE ROTATION)1673C, 3176C, 3196, 3304, 3304B, 3306, 3306B, 3306C120G, 12G, 12H, 12H ES, 12H NA, 130G, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160H, 160H ES, 160H NA, 163H NA, 1673C, 235, 235B, 330, 330 L, 330B
4W2606SEAL GP-CRANKSHAFT (FRONT)D379B, D398, D398A, D398B, D399, G398
4W2607SEAL GP-CRANKSHAFT (REAR)D379B, D398, D398A, D398B, D399, G398
4W5360SEAL-CRANKSHAFT (REAR)3054, 3054B, 3056206, 212, 214, 224, 307, 312, 312B L, 312C, 315, 315B L, 317, 416, 416B, 416C, 416D, 420D, 424D, 426, 426B, 426C, 428, 428B, 428C, 428D, 430D, 432D, 436C, 438B, 438C, 438D, 442D
4W8133SEAL GP (BRAKESAVER) (REAR)3406B, 3406C, 3406E, 3408, C-15, C-16, C15
4W8134SEAL GP (BRAKESAVER) (REAR)3406B, 3406C, 3406E, 3408, C-15, C-16, C15
5I7656SEAL (FRONT)3064, 3066311, 311B, 311C, 311D LRR, 312, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318D L, 319D, 319D L, 319D LN, 320, 320 L, 320B, 320B FM LL, 320C, 320N
5I7660SEAL AS (REAR)3064, 3066311, 311B, 311C, 311D LRR, 312B, 312C, 312C L, 312D, 312D L, 313D, 314C, 314D CR, 314D LCR, 315D L, 318C, 318D L, 319C, 319D, 319D L, 319D LN, 320 L, 320B, 320B L, 320C, 320C FM, 320C L, 320D, 320D FM
5S3903SEAL GP-CRANKSHAFT (REAR)1674, 1676, 1693, D336, D342, D342C, D343, G343621, 631C, 657, 769, 824B, D8H, D8K
5S6297SEAL ASSEM. (REAR)1673C, 3304, 330614E, 518, 561C, 627, 941, 955L, 966C, 977K, 980B, D4D, D5
7C1728SEAL-CRANKSHAFT (REAR)3176, 3176B, 3176C, 3196140H, 143H, 14H, 160H, 163H, 16H, 345B, 345B II, 345B II MH, 345B L, 345C, 345C L, 345C MH, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L HVG, 349E L VG, 349F L
7C4297SEAL GP-CRANKSHAFT (REAR)3306C140G, 160G, 235B, 515, 518C, 525, 528B, 530B, 545, 572G, 572R, 611, 615C, 627B, 627E, 627F, 627G, 637E, 637G, D4E SR, D5E, D6D, D6E, D6E SR, D6G, D6G SR, D6G2 LGP, D6G2 XL, D6H, D6R, D6R II, D7
7C6660SEAL GP-CRANKSHAFT (FRONT)3208613C, PR-1000, PS-500
7C7473SEAL GP-CRANKSHAFT (FRONT)D346, D348, D349641B, 772, 777, 992, D10
7C7474SEAL GP-CRANKSHAFT24H24H
7H6747SEAL GP-CRANKSHAFT (REAR) .025D342, D342C583H D8H
7W3200SEAL GP-CRANKSHAFT (REAR)3204, 3208613C, 931B, 943, 953, PR-1000, PS-500
7W3202SEAL GP-CRANKSHAFT (REAR)1140, 1145, 1150, 1160, 3160, 3204215, 910, 916, 926, 931B, 943, 953, D3, D4HTSK II
9H1129SEAL GP-CRANKSHAFT (REAR)1673, 1673B, 3306924G, 924GZ, 924H, 924HZ, 924K, 928F, 928G, 928H, 928HZ, 930G, 930K, 955H, 955K, 977H, D320A, D330A, D4D, IT28F, IT28G
9L7735SEAL-LIP TYPE (FRONT)1140, 1145, 1150, 1160, 3160, 3204215, 910, 916, 926, 931B, 943, 953, D3, D4HTSK II
9N3775SEAL GP-CRANKSHAFT (REAR)1693, D343, G343
9Y9895SEAL GP-CRANKSHAFT (FRONT) (CLOCKWISE ROTATION)1673C, 3304, 3304B, 3306, 3306B, 3306C120G, 12G, 12H, 12H ES, 12H NA, 130G, 140B, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160H, 160H ES, 160H NA, 163H NA, 235, 235B, 330, 330 L, 330B, 330B

CRANKSHAFT SEALS For Komatsu®

PART NO.DESCRIPTIONENGINEAPPLICATION
6150-21-3230SEAL (FRONT) KOMATSUSAA6D125E6D125
6151-21-4161SEAL (REAR) KOMATSUS6D140, S6D140E, SA6D125E, SA6D140, SA6D140E, SAA6D125E, SAA6D140EPC400, PC450, PC490
6736-21-4221SEAL (REAR) KOMATSUS6D102E, SA6D114E, SAA4D107E, SAA6D102E, SAA6D107E, SAA6D114EPC200, PC200LL, PC220, PC220LL, PC240, PC270, PC290, PC300, PC300HD, PC300LL, PC350, PC350HD, PC350LL, WA250, WA320, WA380, WA430

CTP Crankshaft Seals are packed with a special anti-rust paper that extends the shelf life of the seal.

* Other part no. not included in the list are available. Please contact your sales representative if you have any questions. Part Numbers are used for reference purposes only. Komatsu® is the registered trademark of Komatsu Ltd.