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Discontinued thruster
Lewmar 140TT 2.2 Gen 1 (discontinued): specs, manual and parts
The Lewmar 140TT 2.2 Gen 1 is a tunnel thruster. The motor sits inside the boat and turns a propeller in a tube through the hull. Lewmar has replaced it with its Gen 2 range. Lewmar’s own 2018 thruster controls brochure, which we read on 11 October 2026, calls the units with the black control box the previous generation and the blue box system the next generation. Some dealers still list Gen 1 part numbers.
This page stays up for the owners still running one. It holds the published figures, the part numbers and the manual. You will not find the unit in the thruster finder, the tool here that matches a unit to your boat, or on the compare page. If you need a new thruster, start with either of those.
The published figures
| Type | Tunnel, fixed mount |
|---|---|
| Thrust | 92 lb (42 kgf) |
| As the maker printed it | 42 kgf / 92 lbs (Lewmar manual 500100, electric specification table) |
| Voltage | 12 V |
| Motor | 2.2 kW |
| Tunnel diameter | 140 mm |
| Maker’s boat length | Not published |
| Part number | 59140112V |
| Last price we read | No price held |
| Manual | Lewmar’s manual for it |
Service parts
These are Lewmar’s own part numbers for the parts an owner replaces, where we could find them: the pin that drives the propeller, the propeller, the anode, the brushes, the switch gear, the fuse and the motor. We read them on 11 October 2026. The last column says how we know each one fits this model. Give the dealer your thruster’s serial number from its label when you order.
| Part | Part number | Lewmar’s name for it | How we know it fits |
|---|---|---|---|
| Drive pin (shear pin) | 559018 | Drive pin | Lewmar’s manual for this model |
| Propeller | 589151 | Propeller | Lewmar’s manual for this model |
| Anode kit | 589150 | Propeller anode kit | Lewmar’s manual for this model |
| Black box (the controller) | 559003 | Black Box | Lewmar’s manual for this model |
| Solenoid (the motor switch) | B11126 | Solenoid | Lewmar’s manual for this model |
| Main fuse | 589012 | ANL fuse 200 A | Lewmar’s manual for this modelFuse holder 589006 (589013 for the T2 holder). |
| Tunnel gasket | 551035 | Tunnel gasket | Lewmar’s manual for this model |
| Replacement motor | 581026 | Motor Assembly | Lewmar’s manual for this modelFisheries Supply sells a "140TT 2.2KW Replacement 12V Electric Motor" for 591401 as 551026. Confirm the number with Lewmar. |
| Original Gen 1 control panels | 589001, 589002, 589004 | Touch panel, single joystick, double joystick (NOT 2.0 kW) | Lewmar’s manual for this model |
| Gen 2 controls on a Gen 1 unit | 589842 | Black box convertor | Lewmar’s 2018 controls brochureLewmar’s 2018 brochure: it lets a Gen 2 control panel run a black box thruster on the existing boat wiring. |
What the manual and listings say
Lewmar's first-generation 140TT 2.2 tunnel thruster, the one wired through a black control box. It is rated 42 kgf (92 lb) on a 2.2 kW motor in a 140 mm tunnel. Lewmar's 2018 thruster controls brochure calls these the previous generation, replaced by its next-generation blue box system, the Gen 2 range sold today in the same motor sizes.
Lewmar sells a converter so a black box unit can take the newer controls.
Replacement and close alternatives
The replacement: Lewmar 140TT Gen 2, 2.2 kW. Lewmar’s Gen 2 range in the same motor size.
These are Lewmar’s nearest current sizes by thrust, in any of its lines.
- Nearest below: Lewmar 140TT Tunnel Thruster, 82 lb, $1,486.
- Nearest above: Lewmar 185TT GEN 2 Tunnel Thruster Package with Joystick, 128 lb, $2,239.
Other makers’ current units of the same style, for the same end, within a quarter of its published thrust:
- VETUS Bow Pro 421, 93 lb, $3,258.
- Sleipner SE30/125S DC, 88 lb, $1,755.
- Max Power CT45-IP, 88 lb, $2,456.