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FAST C6J45TB Gearbox Parts - Clutch/Transmission Case/Second Shaft/Countershaft Assembly

  • Exclusively fits FAST C6J45TB 6-speed manual gearbox
  • Covers clutch, transmission case, second shaft and countershaft assembly parts
  • OEM-compatible, precision-machined and factory-inspected
  • Made of high-strength steel, wear-resistant rubber and durable engineering plastics
  • Suitable for buses, trucks, tractors and special vehicles’ heavy-duty operations

    Application & Compatibility

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    Model

    C6J45TB

    Brand

    Fast

    Number of Gears

    6 forward gears + 1 reverse gear

    Shifting Mode

    Manual Transmission

    Maximum Input Torque

    450 N.m

    Adapted Vehicles

    Suitable for harsh working conditions and heavy-duty operations, widely applied in buses, trucks, tractors and special vehicles

    Product Description

    These parts are engineered exclusively for the FAST C6J45TB 6-speed manual gearbox, tailored to heavy-duty scenarios like long-haul transportation, logistics and special vehicle operations.


    Crafted from premium materials—high-strength steel for shafts and gears, wear-resistant rubber for seals, and durable engineering plastics for structural components—all parts undergo professional precision processing. Key processes include forging, heat treatment, CNC machining and airtightness testing, meeting the gearbox’s 450 N.m maximum input torque requirement. Strict dimensional accuracy and performance inspections ensure full compatibility with original equipment.


    Clutch and Transmission Case Assembly Parts

    Clutch housing, transmission case, release fork and gaskets—forming the gearbox’s structural foundation and sealing system.

    Second Shaft Assembly Parts

    Second shaft, 1st-6th/reverse gears and synchronizer assemblies—core components for smooth power transmission and gear shifting.

    Countershaft Assembly Parts

    Countershaft, drive gears, tapered roller bearings and retaining rings—supporting balanced torque distribution in heavy-load operations.


    Direct-fit design allows hassle-free installation without modification, fully interchangeable with original parts. Ideal for routine maintenance, emergency repairs and fleet bulk procurement.

    Detail Parts List

    1Clutch and Transmission Case Assembly

    1-

    No.

    Parts No.

    Part Name

    Qty.

    1

    Q1841252

    Hexagon Flange Bolt

    8

    2

    78CT5737F0

    Self-Lubricating Constant-Contact Clutch Release Bearing

    1

    3

    15641022-4

    Release Fork

    1

    4

    C04022-2

    Release Fork Bushing

    1

    5

    Q5280318

    Elastic Cylinder Pin

    2

    6

    Q40306

    Spring Washer

    1

    7

    Q150B0610

    Hexagon Head Bolt

    1

    8

    C04022-1

    Release Fork Bushing

    1

    9

    C04016-4

    Card Plate

    1

    10

    15621040-2

    Input Shaft Bearing Cover

    1

    11

    Q1420825

    Hexagon Head Bolt and Spring Washer Assembly

    4

    12

    5J30T-1701024B-1

    Input Shaft Oil Seal

    1

    13

    15626015-Y

    Clutch Housing

    1

    14

    15641020-1

    Inspection Hole Cover

    2

    15

    Q1420612

    Hexagon Head Bolt and Spring Washer Assembly

    4

    16

    Q1420812

    Hexagon Head Bolt and Spring Washer Assembly

    2

    17

    15641020-2

    Inspection Hole Cover

    1

    18

    Q1421025

    Hexagon Head Bolt and Spring Washer Assembly

    6

    19

    5J30T-1701020B-1

    PTO Window Cover

    1

    20

    QD40I-4211187

    Pipe Plug

    3

    21

    QD40I-4211188

    O-Ring

    4

    22

    5J30T-1701085B-1

    Oil Drain Magnet Plug Assembly

    1

    23

    Q5210612

    Cylinder Pin

    2

    24

    15621015-Y

    Transmission Case

    1

    25

    C04015-9

    Release Strut

    1

    26

    Q40320

    Spring Washer

    1

    27

    Q340B20

    Type 1 Hexagon Nut

    1

    28

    Q2713508

    Cross Recessed Pan Head Self-Tapping Screw - Type C

    2

    29

    C01007-271

    Name Plate

    1

    30

    Q1421020

    Hexagon Head Bolt and Spring Washer Assembly

    1

    31

    20815

    Lifting Bent Plate

    1

    32

    Q72318

    Sealing Washer

    1

    33

    Q617B18

    Hexagon Head Pipe Plug

    1

    2、Second Shaft Assembly

    2-

    No.

    Parts No.

    Part Name

    Qty.

     

    15681100-2

    Second Shaft Assembly

    1

    1

    15621105-2

    Second Shaft

    1

    2

    15621107

    Reverse Gear Seat Retaining Ring

    1

    3

    15621108-1

    Second Shaft Reverse Gear Seat

    1

    4

    15621109-1

    Reverse Sliding Gear Sleeve

    1

    5

    15631110

    Second Shaft Reverse Gear

    1

    6

    15621118

    Reverse Gear Bearing Seat

    1

    7

    15631121

    Second Shaft 1st Gear Assembly

    1

    8

    FQZC2558X63X28

    Needle Bearing

    1

    9

    FQZC2558X63X38

    Needle Bearing

    3

    10

    15621119

    1st Gear Bearing Seat

    1

    11

    15621130-1

    1st/2nd Gear Synchronizer Assembly

    1

    12

    15621122

    Second Shaft 2nd Gear Assembly

    1

    13

    15621123-3

    Second Shaft 3rd Gear Assembly

    1

    14

    JS125T-1701123

    Stop Ring

    1

    15

    15621140-1

    3rd/4th Gear Synchronizer Assembly

    1

    16

    FQZC2548X54X30

    Needle Bearing

    1

    17

    15621117

    Second Shaft 4th Gear Retaining Ring

    1

    18

    15621124-1

    Second Shaft 4th Gear Assembly

    1

    19

    JS85T-1701122

    Stop Ring

    1

    20

    15631125

    Second Shaft Overdrive Gear Assembly

    1

    21

    K35X40X30_5ZWD

    Needle Bearing

    1

    22

    15621150-3

    5th/6th Gear Synchronizer Assembly

    1

    23

    5J55T-1701123

    Spacer

    1

    24

    RN2304X2-YA-1

    Cylindrical Roller Bearing Without Outer Ring

    1

    25

    Q43120

    Elastic Retaining Ring for Shaft

    1

    26

    4_00G100BGB-T308

    Steel Ball

    1

    3、Countershaft Assembly

    3-

    No.

    Parts No.

    Part Name

    Qty.

     

    15681047

    Countershaft Assembly

    1

    1

    Q43135

    Elastic Retaining Ring for Shaft

    1

    2

    32207

    Tapered Roller Bearing

    2

    3

    15681056

    Countershaft Drive Gear

    1

    4

    15631055

    Countershaft Overdrive Gear

    1

    5

    15621054

    Countershaft 4th Gear

    1

    6

    15621053

    Countershaft 3rd Gear

    1

    7

    15631048

    Countershaft

    1

    Product Advantages

    C6J45TB Exact Fit
    100% matched to original dimensions, no fitment issues for heavy-duty repairs.
    Heavy-Duty Durability
    Withstands 450 N.m torque and harsh working conditions, extending service life.
    Stable Power Transmission
    Precision-machined second shaft and countershaft guarantee consistent torque delivery.
    Superior Sealing Performance
    High-quality gaskets and oil seals prevent oil leakage and dust intrusion.
    Easy Maintenance
    Modular design enables quick replacement without full gearbox disassembly.

    Payment & Shipping Terms

    MOQ: 1 piece

    Packaging: Customizable wooden crate/carton

    Delivery: 3-20 working days (express: DHL/FedEx; sea freight for bulk)

    Payment: L/C, T/T, Western Union; tracking number provided in 24hrs

    ● After-Sales Service:24-hour technical support, global service network

     

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