The speed input range of the Advance 120C marine gearbox is 1000-2500 RPM, with engine input power from 168 kW to 210 kW. the center distance is 180 mm, the reduction ratio range is 1.48-3.35, the transmission capacity range is 0.08-0.1 kW/RPM, the rated propeller thrust is 25 KN, and the input shaft is in the train Opposite to the output shaft.
Advance 120C marine gearbox is composed of transmission shaft, output coupling, input coupling, oil pressure gauge, oil Filter, control system, oil pump and other important components.
Advance 120C marine gearboxes provides two types of control system which are push-pull flexible shaft, electric control for customers to choose. To meet the different requirement of coupling with different engine brand and models, Advance 120C marine gearboxes provide different SAE size coupling and housing including SAE 1 2 3, flywheel SAE 14 11.5 is available……
All of our Advance 120 series marine gearbox can provide CCS classification certificate, some of series can provide international classifications with extra costs which mainly including French BV, British LR, American ABS, Japanese NK , Norway DNV-GL, Russia RS, South Korea KR, Italy RINA and other classification societies.
Advantages Of Advance 120C Marine Gearbox Parts
It has the functions of reversing, clutching, and deceleration, and can be matched with various marine diesel engines with equivalent torque to form a unit. Applicable to all kinds of medium and small ships.
The gearbox has a compact structure and can be controlled by a variety of control methods. The operation is light and sensitive, and it can be operated from a distance, which is convenient for driving and machine integration.
The advanced design makes the connection of the gearbox very soft, easy to maintain, more durable, and has the characteristics of large transmission power, small size and light weight.
The toothed elastic input coupling and connection cover can be matched with various flywheels and flywheel shells to connect with the host, easy installation and beautiful appearance
With excellent deceleration effect and strong bearing propeller thrust
Professional gearbox specialists and after-sales service, spare parts directly available from stock.
Technical Specifications
| Gearbox Model: | 120C |
| Input Speed: | 1000-2500 RPM |
| Power: | 168 – 210 kW @ 2100 RPM |
| Center Distance: | 180 mm |
| Trans.Capacity: | 0.08 – 0.1 kW / RPM |
| Reduction Ratio: | 1.48 2.96 3.35 |
| Rated Thrust: | 25 kN |
| Dimension: | 432 mm * 440 mm * 650 mm |
| Net Weight: | 225 kg |
| Lead Time: | 15-30 Working Days |
| Payment Terms: | T/T ,L/C |
Click Kit Name to Check Part List
- Input Shaft Assembly
- Transmission Shaft Assembly
- Output Shaft Assembly
- Housing Assembly
- Oil Pipe System Assembly
- Tootned Input Coupling Assembly
- Companion Coupling Assembly
No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Bolt | M8x25 GB30 – 76 | 4 | Standard part |
| 2 | Washer | 8GB93 – 76 | 4 | Standard part |
| 3 | Sleeve | 120C – 01 – 003 | 1 | / |
| 4 | Bearing | 7313E GB297 – 84 | 1 | Standard part |
| 5 | Bearing spacer | 120C – 01 – 005 | 1 | / |
| 6 | Spacer | 65GB894 – 76 | 1 | Standard part |
| 7 | Spacer | 45GB895 – 76 | 1 | Standard part |
| 8 | Thrust ring | 120C – 01 – 006 | 2 | / |
| 9 | Pinion | 120C-01-101/1.5 | 1 | mn = 3.5 z = 40 i = 1.5 |
| 10 | Pinion | 120C-01-101/2 | 1 | mn = 3.5 z = 34 i = 2 |
| 11 | Pinion | 120C-01-101/2.5 | 1 | mn = 3.5 z = 29 i = 2.5 |
| 12 | Pinion | 120C-01-101/3 | 1 | mn = 3.5 z = 25 i = 3 |
| 13 | Pinion | 120C-01-101/3.5 | 1 | mn = 3.5 z = 23 i = 3.5 |
| 14 | sleeve | 120C-01-102 | 1 | / |
| 15 | Spacer | 135GB893 – 76 | 1 | Standard part |
| 16 | Thrust plate | 120C – 01 – 007 | 1 | / |
| 17 | External disc | 120C – 01 – 008 | 7 | / |
| 18 | Internal disc | 120C – 01 – 009 | 7 | / |
| 19 | Single – face external disc | 120C – 01 – 010 | 1 | / |
| 20 | Bolt | M10x30 GB21 – 76 | 1 | Standard part |
| 21 | End cover | 120C – 01 – 001 | 1 | / |
| 22 | Gasket | 120C – 01 – 002 | 1~2 | / |
| 23 | Adjusting plate for thrust ring | 120C – 01 – 004 | 1~2 | / |
| 24 | Sealing ring | 120C – 01 – 016 | 1 | / |
| 25 | Spacer | 45GB894 – 76 | 1 | Standard part |
| 26 | Thrust – ring spacer | 120C – 01 – 015 | 2 | / |
| 27 | Return spring | 120C – 01 – 014 | 1 | / |
| 28 | Piston | 120C – 01 – 011 | 1 | / |
| 29 | Piston ring | 120C – 01 – 012 | 1 | / |
| 30 | Input shaft | 120C – 01 – 202 | 1 | / |
| 31 | Transmission gear | 120C – 01 – 201 | 1 | / |
| 32 | Bearing | 7309E GB297 – 84 | 1 | Standard part |
| 33 | Oil sealing | 120C – 01 – 013 | 2 | / |
| 34 | Plug | φ7Q21 – 14 | 1 | / |
| 35 | Screw | M10x16GB77 – 85 | 2 | Standard part |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Bolt | M10x30 GB21 – 76 | 1 | Standard part |
| 2 | Washer | 120C – 02 – 004 | 1 | / |
| 3 | Bearing | 7310E GB297 – 84 | 1 | Standard part |
| 4 | Bearing bush | 120C – 02 – 001 | 1 | / |
| 5 | Adjusting plate | 120C – 02 – 003 | 1~2 | / |
| 6 | Thrust ring | 120C – 01 – 006 | 2 | / |
| 7 | Pinion | 120C-01-101/1.5 | 1 | mn = 3.5 z = 40 i = 1.5 |
| 8 | Pinion | 120C-01-101/2 | 1 | mn = 3.5 z = 34 i = 2 |
| 9 | Pinion | 120C-01-101/2.5 | 1 | mn = 3.5 z = 29 i = 2.5 |
| 10 | Pinion | 120C-01-101/3 | 1 | mn = 3.5 z = 25 i = 3 |
| 11 | Pinion | 120C-01-101/3.5 | 1 | mn = 3.5 z = 23 i = 3.5 |
| 12 | Sleeve | 120C – 01 – 102 | 1 | / |
| 13 | Thrust – ring spacer | 120C – 01 – 015 | 2 | / |
| 14 | Spacer | 45 GB894 – 76 | 1 | Standard part |
| 15 | Return spring | 120C – 01 – 014 | 1 | / |
| 16 | Spacer | 135 GB893 – 76 | 1 | Standard part |
| 17 | Thrust plate | 120C – 01 – 007 | 1 | / |
| 18 | External disc | 120C – 01 – 008 | 7 | / |
| 19 | Internal disc | 120C – 01 – 009 | 7 | / |
| 20 | Single – face external disc | 120C – 01 – 010 | 1 | / |
| 21 | piston | 120C – 01 – 011 | 1 | / |
| 22 | Piston ring | 120C – 01 – 012 | 1 | / |
| 23 | Transmission shaft | 120C – 02 – 102 | 1 | / |
| 24 | Gear | 120C – 02 – 101 | 1 | / |
| 25 | Screw | M10x16 GB77 – 85 | 2 | Standard part |
| 26 | Bearing | 7309E GB297 – 84 | 1 | Standard part |
| 27 | Oil sealing | 120C – 01 – 013 | 2 | / |
| 28 | Plug | φ7Q21 – 14 | 1 | / |
| 29 | Pump connecting cap | 120C – 02 – 002 | 1 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Bearing | 27314E GB297 – 84 | 1 | Standard part |
| 2 | Wheel | 120C-03-101/1.5 | 1 | mn = 3.5 z = 59 i = 1.5 |
| 3 | Wheel | 120C-03-101/2 | 1 | mn = 3.5 z = 66 i = 2 |
| 4 | Wheel | 120C-03-101/2.5 | 1 | mn = 3.5 z = 71 i = 2.5 |
| 5 | Wheel | 120C-03-101/3 | 1 | mn = 3.5 z = 74 i = 3 |
| 6 | Wheel | 120C-03-101/3.5 | 1 | mn = 3.5 z = 77 i = 3.5 |
| 7 | Output Shaft | 120C – 03 – 102 | 1 | / |
| 8 | Key | C20x80 GB1096 – 79 | 1 | Standard part |
| 9 | Bearing | 7514E GB297 – 84 | 1 | Standard part |
| 10 | Sealing | W70x95x7 JB2600 – 80 | 1 | Standard part |
| 11 | Output coupling | 120C – 03 – 001 | 1 | / |
| 12 | Plate | 120C – 03 – 003 | 1 | / |
| 13 | Lock washer | 120C – 03 – 002 | 1 | / |
| 14 | Bolt | M16x40 – 8.8 GB30 – 76 | 3 | Standard part |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Oil sealing bush | 120C – 04 – 008 | 2 | / |
| 2 | Gasket | MB170 – 04 – 022 | 1 | / |
| 3 | Rear end cover of transmission shaft | 120C – 04 – 015 | 1 | / |
| 4 | Gasket | 120C – 04 – 016 | 1 | / |
| 5 | Spacer | 80 GB893 – 76 | 2 | Standard part |
| 6 | “O” ring | 92.5×3.55 GB3452.1 – 82 | 2 | Standard part |
| 7 | Plug | φ7 Q21 – 14 | 8 | / |
| 8 | Rear end cover of input shaft | 120C – 04 – 011 | 1 | / |
| 9 | Gasket | 120C – 04 – 012 | 1 | / |
| 10 | Plug | φ10 Q21 – 38 | 1 | / |
| 11 | Bolt | M10×120 GB21 – 76 | 2 | Standard part |
| 12 | “O” ring | 9×2.65 GB3452.1 – 82 | 4 | Standard part |
| 13 | Rear end cover | 120C – 04 – 303 | 1 | / |
| 14 | Adjusting plate | 120C – 04 – 009 | 4~8 | / |
| 15 | Plug | Z3/8″Q20 – 02 | 1 | / |
| 16 | Pin | 12ga×25 GB120 – 76 | 5 | Standard part |
| 17 | Spring | 1×10×40 GB2089 – 80 | 1 | Standard part |
| 18 | Gasket | 120C – 04 – 007 | 1 | / |
| 19 | Rivet | 2×6 GB827 – 76 | 6 | Standard part |
| 20 | Name plate | Q25 – 01 – 01 | 1 | / |
| 21 | Right support | 120C – 04 – 002/1 | 1 | / |
| 22 | Left support | 120C – 04 – 002/2 | 1 | / |
| 23 | Support | 120C – 04 – 002x₁ | 2 | On request |
| 24 | Dipstick group | 120C – 04 – 100 | 1 | / |
| 25 | Screw | M12 GB825 – 76 | 2 | Standard part |
| 26 | Top cover | 120C – 04 – 006A | 1 | / |
| 27 | Dipstick sleeve | 120C – 04 – 001 | 1 | / |
| 28 | Screw | M8×16 GB70 – 85 | 4 | Standard part |
| 29 | Screw | M6×10 GB67 – 76 | 2 | Standard part |
| 30 | Rotation arrow | 7501 – 012 | 1 | / |
| 31 | Breathing cap group | 120C – 04 – 200 | 1 | / |
| 32 | Cover | 1601 – 0018 | 1 | / |
| 33 | Bell housing | 120C – 04 – 003/1 | 1 | For Diesel 6135 |
| 34 | Bell housing | 120C – 04 – 003x₁ | 1 | For SAE No. 1 |
| 35 | Bell housing | 120C – 04 – 003x₂ | 1 | For SAE No. 2 |
| 36 | Bell housing | 120C – 04 – 003x₃ | 1 | For no bell housing |
| 37 | Front end cover | 120C – 04 – 005 | 1 | / |
| 38 | Washer | 10 GB93 – 76 | 42 | Standard part |
| 39 | Bolt | M10×30 GB21 – 76 | 32 | Standard part |
| 40 | Gasket | 120C – 04 – 004 | 1 | / |
| 41 | Washer | 12 GB93 – 76 | 11 | Standard part |
| 42 | Bolt | M6×20 GB32 – 76 | 4 | Standard part |
| 43 | Galvanized steel wire | φ1.4 GB343 – 82 | 4 | Length L = 500mm |
| 44 | Bolt | M10×80 GB21 – 76 | 4 | Standard part |
| 45 | Rear cover of oil filter | 120C – 04 – 017 | 1 | / |
| 46 | Gasket | 120C – 04 – 018 | 2 | / |
| 47 | Oil filter | WU63×100 – J | 1 | With safety device |
| 48 | Front cover of oil filter | 120C – 04 – 019 | 1 | / |
| 49 | Screw | M10×35 GB70 – 76 | 4 | Standard part |
| 50 | Oil sealing | W70×95×7 JB2600 – 80 | 1 | Standard part |
| 51 | Oil sealing | PC70×95×12 JB2600 – 80 | 2 | Standard part |
| 52 | Rear end cover of output shaft | 120C – 04 – 013 | 1 | / |
| 53 | Gasket | 120C-04-013 | 1 | / |
| 54 | “O” ring | 115×5.3 GB3452.1-82 | 1 | Standard part |
| 55 | Plug | M22x1.5 Q21-15 | 1 | / |
| 56 | Washer | 22 Q20-03 | 1 | / |
| 57 | Adjusting plate φ124 | 120C-04-010 | ≈4 | / |
| 58 | Cover | 120C – 04 – 302 | 1 | / |
| 59 | Oil shroud element | 120C – 04 – 400 | 1 | / |
| 60 | Bolt | M10x16 GB21 – 76 | 2 | Standard part |
| 61 | Housing | 120C – 04 – 301 | 1 | / |
| 62 | Bolt | M12x30 GB30 – 76 | 11 | Standard part |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Pump | BB – B16A | 1 | / |
| 2 | Pump inlet – pipe group | 120C – 05 – 200 | 1 | / |
| 3 | Pump outlet – pipe group | 120C – 05 – 100A | 1 | / |
| 4 | Hydraulic Control Assembly | Q06 – 01A – 000 | 1 | / |
| 5 | Cooler Assembly(Type 135) | Q08 – 02 – 00A | 1 | / |
| 6 | Cooler inlet – pipe group | 120C – 05 – 300 | 1 | / |
| 7 | Cooler outlet – pipe group | 120C – 05 – 400 | 1 | / |
| 8 | Bolt | M22×1.5×40 Q21 – 18 | 8 | / |
| 9 | Washer | 22 Q20 – 03 | 16 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Internal toothed ring | Q05 – 02 – 02 | 1 | For 6135C flywheel |
| 2 | Internal toothed ring | Q05 – 02 – 03 | 1 | For SAE No. 14 flywheel |
| 3 | Internal toothed ring | Q05 – 05 – 02 | 1 | For SAE No. 11½ flywheel |
| 4 | Toothed rubber block | Q26 – 06 – 02 | 24 | 18 blocks for Q05 – 05 – 01x₁ |
| 5 | External toothed ring | Q05 – 05 – 01 | 1 | For Q05 – 02 – 02, Q05 – 02 – 03 |
| 6 | External toothed ring | Q05 – 05 – 01x₁ | 1 | For Q05 – 05 – 02 |
| 7 | Washer | 12 GB93 – 76 | 10 | Standard part |
| 8 | Bolt | M12×30 GB30 – 76 | 10 | Standard part |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Bolt | M16x70 – 8.8 GB30 – 76 | 6 | Standard part |
| 2 | Washer | 16 GB93 – 76 | 6 | Standard part |
| 3 | Nut | M16 GB52 – 76 | 6 | Standard part |
| 4 | Companion coupling | 120C – F3 – 01 | 1 | / |
| ——END—— | ||||

Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

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