The speed input range of the Advance MA125 marine gearbox is 1500-3000 RPM, with engine input power from 23.1 kW to 42 kW. the center distance is 125 mm, the reduction ratio range is 2.03-4.70, the transmission capacity range is 0.011-0.02 kW/RPM, the rated propeller thrust is 5.5 KN, and the input shaft is in the train Opposite to the output shaft.
Advance MA125 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 MA125 marine gearboxes provides of control system which are push-pull flexible shaft, To meet the different requirement of coupling with different engine brand and models, Advance MA125 marine gearboxes provide different SAE size coupling and housing including SAE 2 3 4, flywheel SAE 11.5 10 is available……
All of our Advance MA 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 MA125 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: | MA125 |
| Input Speed: | 1500-3000 RPM |
| Power: | 60 kW @ 3000 RPM |
| Center Distance: | 125 mm |
| Trans.Capacity: | 0.02-0.011 kW / RPM |
| Reduction Ratio: | 2.03-4.70 |
| Rated Thrust: | 5.5 kN |
| Dimension: | 291 mm * 454 mm * 485 mm |
| Net Weight: | 115 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
- Hydraulic Control System
- P.T.O Assembly
- Cooler Assembly
No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Plug | 125 – 01 – 003 | 1 | / |
| 2 | Internal toothed ring | Q05 – 11 – 02A Q05 – 11 – 02X1A | 1 | / |
| 3 | External toothed ring | Q05 – 11 – 01 | 1 | / |
| 4 | Toothed rubber block | Q26 – 06 – 01 | 16 | / |
| 5 | Input flange | 125 – 01 – 002A | 1 | / |
| 6 | Oil seal | SPD 50×68×8 HG 4 – 692 – 67 | 1 | / |
| 7 | Front cover | 125 – 01 – 001A | 1 | / |
| 8 | Bearing | 208GB276 – 82 | 2 | / |
| 9 | Snap ring (for shaft) | 35GB894 – 76 | 1 | / |
| 10 | Snap ring (for shaft) | 40GB894 – 76 | 1 | / |
| 11 | Snap ring (for hole) | 75GB893 – 76 | 1 | / |
| 12 | Washer | 10GB93 – 76 | 8 | / |
| 13 | Bolt | M10×25GB21 – 76 | 8 | / |
| 14 | Stop ring for bearing | 90GB305 – 82 | 2 | / |
| 15 | Bearing | 50308GB277 – 82 | 1 | / |
| 16 | Pinion | 125 – 01 – 201/2 | 1 | / |
| 17 | Pinion | 125 – 01 – 201/2.5 | 1 | / |
| 18 | Pinion | 125 – 01 – 201/3 | 1 | / |
| 19 | Pinion | 125 – 01 – 201/3.5 | 1 | / |
| 20 | Pinion | 125 – 01 – 201/4 | 1 | / |
| 21 | Pinion | 125 – 01 – 201/4.5 | 1 | / |
| 22 | Pinion | 125 – 01 – 201/5 | 1 | / |
| 23 | Spacer | 125 – 01 – 203 | 1 | / |
| 24 | Bearing | 111GB276 – 82 | 1 | / |
| 25 | Snap ring (for shaft) | 55GB894 – 76 | 1 | / |
| 26 | Clutch bracket | 125 – 01 – 202 | 1 | / |
| 27 | Snap ring (for hole) | 90GB893 – 76 | 1 | / |
| 28 | Thrust plate | 100 – 01 – 003 | 1 | / |
| 29 | External disc | 100 – 01 – 009 | 8 | / |
| 30 | Internal disc | 100 – 01 – 010 | 7 | / |
| 31 | Snap ring (for shaft) | 26GB894 – 76 | 1 | / |
| 32 | Snap ring | 100 – 01 – 011 | 1 | / |
| 33 | Return spring | 100 – 01 – 007 | 1 | / |
| 34 | Piston | 100 – 01 – 005 | 1 | / |
| 35 | Piston ring | 100 – 01 – 004 | 1 | / |
| 36 | Screw | M8×10GB77 – 76 | 2 | / |
| 37 | Transmission gear | 125 – 01 – 012 | 1 | / |
| 38 | Bearing | 50210GB277 – 82 | 1 | / |
| 39 | Snap ring (for shaft) | 50GB894 – 76 | 1 | / |
| 40 | Input shaft | 100 – 01 – 0101 | 1 | / |
| 41 | Dividing oil plug | 125 – 01 – 0103 | 1 | / |
| 42 | Seal ring | 100 – 01 – 0006 | 2 | / |
| 43 | Fastening bolt | 125 – 01 – 0104 | 1 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Bearing | 125 – 02 – 002 | 1 | / |
| 4 | Snap ring (for shaft) | 40GB894 – 76 | 1 | / |
| 5 | Stop ring for bearing | 90GB305 – 82 | 2 | / |
| 6 | Bearing | 50308GB277 – 82 | 1 | / |
| 7 | Pinion | 125 – 01 – 201/2 | 1 | for ratio 4.5 Z=15 |
| 7 | Pinion | 125 – 01 – 201/2.5 | 1 | for ratio 5 Z=32 |
| 7 | Pinion | 125 – 01 – 201/3 | 1 | for ratio 2 Z=28 |
| 7 | Pinion | 125 – 01 – 201/3.5 | 1 | for ratio 2.5 Z=24 |
| 7 | Pinion | 125 – 01 – 201/4 | 1 | for ratio 3 Z=21 |
| 7 | Pinion | 125 – 01 – 201/4.5 | 1 | for ratio 3.5 Z=19 |
| 7 | Pinion | 125 – 01 – 201/5 | 1 | for ratio 4 Z=18 |
| 8 | Spacer | 125 – 01 – 203 | 1 | / |
| 9 | Bearing | 111GB276 – 82 | 1 | / |
| 10 | Snap ring (for shaft) | 55GB894 – 76 | 1 | / |
| 11 | Clutch bracket | 125 – 01 – 202 | 1 | / |
| 12 | Snap ring (for hole) | 130GB893 – 76 | 1 | / |
| 14 | External disc | MB170 – 01 – 012 | 8 | / |
| 15 | Internal disc | 142 – 01 – 006 | 7 | / |
| 16 | Screw | M10x12GB77 – 76 | 2 | / |
| 17 | Snap ring (for shaft) | 30GB894 – 76 | 1 | / |
| 22 | Transmission gear | 125 – 02 – 0102 | 1 | / |
| 23 | Bearing | 50210GB277 – 82 | 1 | / |
| 24 | Snap ring (for shaft) | 60GB894 – 76 | 1 | / |
| 25 | Transmission shaft | 125 – 02 – 0101 | 1 | / |
| 26 | Dividing oil plug | 125 – 01 – 0103 | 1 | / |
| 27 | Seal ring | 100 – 01 – 0006 | 2 | / |
| 28 | Fastening bolt | 125 – 01 – 0104 | 1 | / |
| 30 | Coupling for oil pump | 125 – 02 – 001 | 1 | / |
| 31 | Oil pump bracket | 125 – 04 – 013 | 1 | / |
| 32 | Oil pump gasket | 125 – 04 – 016 | 1 | / |
| 33 | Oil pump | BB – B6D | 1 | / |
| 34 | Oil pipe assembly | Q06 – 01A – 200 | 1 | / |
| 34 | Connector | 14×1.5 Q21 – 19 | 7 | / |
| 34 | Connector | 14×1.5 Q21 – 20 | 1 | / |
| 34 | Copper washer | 14Q20 – 03 | 17 | / |
| 35 | Hydraulic oil pipe | 125 – 00 – 100 | 1 | / |
| 36 | Hydraulic oil pipe | 125 – 00 – 200 | 1 | / |
| 37 | Lubricating pipe | 100-00-200 | 1 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Nut | M39x1.5GB812 – 76 | 1 | / |
| 2 | Lock washer | 39GB858 – 76 | 1 | / |
| 3 | Stop ring for bearing | 90GB305 – 82 | 1 | / |
| 4 | Bearing | 50308GB277 – 82 | 1 | / |
| 5 | Spacer | 125 – 01 – 203 | 1 | / |
| 6 | Driven gear | 125 – 03 – 001/2 | 1 | for ratio 2 Z=65 |
| 7 | Driven gear | 125 – 03 – 001/2.5 | 1 | for ratio 2.5 Z=69 |
| 8 | Driven gear | 125 – 03 – 001/3 | 1 | for ratio 3 Z=73 |
| 9 | Driven gear | 125 – 03 – 001/3.5 | 1 | for ratio 3.5 Z=75 |
| 10 | Driven gear | 125 – 03 – 001/4 | 1 | for ratio 4 Z=77 |
| 11 | Driven gear | 125 – 03 – 001/4.5 | 1 | for ratio 4.5 Z=79 |
| 12 | Driven gear | 125 – 03 – 001/5 | 1 | for ratio 5 Z=80 |
| 13 | Snap ring (for shaft) | 50GB894 – 76 | 1 | / |
| 14 | Bearing | 2110GB283 – 81 | 1 | / |
| 15 | Oil seal | SD55x80x12 HG4 – 692 – 67 | 1 | / |
| 16 | Key | 14x55GB1096 – 79 | 1 | / |
| 17 | Nut | M10GB52 – 76 | 6 | / |
| 18 | Nut | M12GB52 – 76 | 6 | / |
| 19 | Spring washer | 10GB93 – 76 | 6 | / |
| 20 | Spring washer | 12GB93 – 76 | 6 | / |
| 21 | Output shaft | 125 – 03 – 003 | 1 | / |
| 22 | Companion – coupling | 125 – F2 – 001 | 1 | / |
| 23 | Bolt | M10x40GB27 – 76 | 6 | / |
| 24 | Bolt | M12x50GB27 – 76 | 6 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Front cover | 125 – 04 – 012 | 1 | for no bell housing |
| 2 | Bell housing | 125 – 04 – 012X1 | 1 | SAE No3 |
| 3 | Bell housing | 125 – 04 – 012X2 | 1 | SAE No4 |
| 4 | Bell housing | 125 – 04 – 012X3 | 1 | SAE No2 Available according to order |
| 5 | Cover | 0601A – 0018 | 1 | / |
| 6 | Spring washer | 6GB93 – 76 | 2 | / |
| 7 | Screw | M6x10GB67 – 76 | 2 | / |
| 8 | Dipstick | 125 – 04 – 200 | 1 | / |
| 9 | Supporter | 125 – 04 – 010 | 2 | / |
| 10 | Rivet | 2x4GB827 – 76 | 4 | / |
| 11 | Name plate | Q25 – 01 – 01 | 1 | / |
| 12 | Housing | 125 – 04 – 100 | 1 | / |
| 13 | Washer | B8GB97 – 76 | 8 | / |
| 14 | Bolt | M8x55GB30 – 76 | 6 | / |
| 15 | Bolt | M8x50GB30 – 76 | 6 | / |
| 16 | Bolt | M8x30GB30 – 76 | 6 | / |
| 17 | Gasket | 125 – 04 – 004 | 1 | / |
| 18 | Gasket | 125 – 04 – 001 | 1 | / |
| 19 | Plug | φ7Q21 – 25 | 2 | / |
| 20 | Gasket | 125 – 04 – 003 | 1 | / |
| 21 | End cover | 125 – 04 – 002 | 1 | / |
| 22 | End cover | 125 – 04 – 002X | 1 | for P. T. O |
| 23 | Plug | Q06 – 03 – 15 | 2 | / |
| 24 | Spring washer | 8GB93 – 76 | 45 | / |
| 25 | Bolt | M8x45GB30 – 76 | 2 | / |
| 26 | Bolt | M8x25GB30 – 76 | 11 | / |
| 27 | Gasket | 125 – 04 – 009A | 1 | / |
| 28 | Bolt | M8x12GB30 – 76 | 10 | / |
| 29 | Pin | 8x30GB118 – 76 | 2 | / |
| 30 | Side cover | 125 – 04 – 015 | 1 | / |
| 31 | Gasket | 125 – 04 – 011 | 1 | / |
| 32 | Bolt | M10x30GB30 – 76 | 10 | / |
| 33 | Spring washer | 10GB93 – 76 | 22 | / |
| 34 | Bottom cover | 125 – 04 – 005A | 1 | / |
| 35 | Bottom cover | 125 – 04 – 005AX | 1 | X means an alternative Part for i<3:1 |
| 36 | Gasket | 125 – 04 – 004 | 1 | / |
| 37 | Screw | M625GB75 – 76 | 1 | / |
| 38 | Nut | M6GB52 – 76 | 1 | / |
| 39 | Copper washer | 22Q20 – 03 | 1 | / |
| 40 | Drain plug | Q21 – 15 | 1 | / |
| 41 | Shroud | 125 – 04 – 006 | 1 | / |
| 42 | Washer | 125 – 04 – 008 | 1 | / |
| 43 | Shim | 404 – 0033 | 1-2 | / |
| 44 | Shim | 142 – 04 – 005 | 1-2 | / |
| 45 | Gasket | 125 – 04 – 007 | 1 | for no bell housing |
| 46 | Gasket | 125 – 04 – 007X | 1 | / |
| 47 | Welding assembly of filter | 125 – 04 – 301 | 1 | 4 parts welded into one as integral |
| 48 | Copper washer | Q21 – 03 | 2 | / |
| 49 | Suction pipe | 125 – 04 – 302 | 1 | / |
| 50 | Connector | Q21 – 19 | 1 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Handle | Q06 – 03 – 13 | 1 | / |
| 2 | Bolt | Q21 – 19 | 1 | / |
| 3 | Copper washer | 14Q20 – 03 | 2 | / |
| 4 | Bolt | M6x15GB30 – 76 | 1 | / |
| 5 | Front cover | Q06 – 03 – 05 | 1 | / |
| 6 | Gasket | Q06 – 03 – 06 | 1 | / |
| 7 | Valve body | Q06 – 03 – 01 | 1 | / |
| 8 | Spring seat | Q06 – 03 – 14 | 1 | / |
| 9 | Spring | 0.8x6x20 JB272 – 60 | 1 | / |
| 10 | Steel ball | 6GB308 – 77 | 1 | / |
| 11 | Plug | φ7Q21 – 14 | 2 | / |
| 11 | Plug | Q06 – 03 – 15 | 4 | / |
| 12 | Pin | 4x10GB879 – 76 | 1 | / |
| 13 | Shifting valve | Q06 – 03 – 02 | 1 | / |
| 14 | Control valve | Q06 – 03 – 12 | 1 | / |
| 15 | Overflow valve | Q06 – 03 – 10 | 2 | / |
| 16 | Spring | Q06 – 03 – 11 | 1 | / |
| 17 | Spring | Q06 – 03 – 09 | 1 | / |
| 18 | Washer | B8GB97 – 76 | 0 – 2 | / |
| 19 | Delay valve | Q06 – 03 – 08 | 1 | / |
| 20 | Rear cover | Q06 – 03 – 03 | 1 | / |
| 21 | Bolt | M6x12GB70 – 76 | 12 | / |
| 22 | Nut | M6GB54 – 76 | 1 | / |
| 23 | Bolt | M6x15GB30 – 76 | 1 | / |
| 24 | Gasket | Q06 – 03 – 04 | 1 | / |
| 25 | Spring | 0.5x7x50 JB272 – 60 | 1 | / |
| 26 | Steel ball | 8GB308 – 77 | 1 | / |
| 27 | Valve seat | Q06 – 03 – 07 | 1 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Coupling | 125 – F1 – 007 | 1 | / |
| 2 | Bearing seat | 125 – F1 – 001 | 1 | / |
| 3 | Oil seal | SPD45x70x12 HG4 – 692 – 67 | 1 | / |
| 4 | Snap ring | 68GB893 – 76 | 1 | / |
| 5 | Bearing | 108GB276 – 82 | 2 | / |
| 6 | Spacer | 125 – F1 – 004 | 1 | / |
| 7 | Snap ring | 40GB894 – 76 | 1 | / |
| 8 | Belt wheel | 125 – F1 – 006 | 1 | / |
| 9 | Seal ring | 100 – 01 – 006 | 2 | / |
| 10 | Flange | 125 – F1 – 005 | 1 | / |
| 11 | Washer | 8GB93 – 76 | 12 | / |
| 12 | Bolt | M8x20GB21 – 76 | 12 | / |
| ——END—— | ||||

No. | Part Name | Part No. | Qty. | Remarks |
| 1 | Connector screw | Q21 – 19 | 2 | / |
| 2 | Washer | 22Q20 – 03 | 4 | / |
| 3 | Flange | Q08 – 03 – 06 | 2 | / |
| 4 | Washer | 8GB93 – 76 | 4 | / |
| 5 | Bolt | M8×20GB30 – 76 | 4 | / |
| 6 | End cover | Q08 – 03 – 01 | 2 | / |
| 7 | “O” ring | Q08 – 03 – 02 | 2 | / |
| 8 | Cooling tube assembly | Q08 – 03 – 100 | 1 | / |
| 9 | Connecting plate | Q08 – 03 – 04 | 1 | / |
| 10 | Bolt | M6 25GB30 – 76 | 4 | / |
| 11 | Washer | 6GB93 – 76 | 12 | / |
| 12 | Housing | Q08 – 03 – 03 | 1 | / |
| 13 | Bolt | M6×40GB900 – 76 | 8 | / |
| ——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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