IN Brief:
- KNDS Deutschland has expanded an order for RENK HSWL 354 hydromechanical transmissions worth approximately €130 million.
- The equipment package also includes TCS-354A control units and G4MA11 gear selectors for Leopard 2 family vehicles.
- Deliveries are scheduled from 2029 to 2032, extending the manufacturers’ longstanding propulsion supply relationship.
RENK and KNDS Deutschland have agreed a contract extension worth approximately €130 million for transmissions used in the Leopard 2 main battle tank and related vehicles. The order covers HSWL 354 hydromechanical transmissions, TCS-354A control units and G4MA11 gear selectors. Deliveries are expected to begin in 2029 and finish in 2032, extending the companies’ established supply relationship for the Leopard platform family.
Announced at the Association of the United States Army exhibition in Washington on 14 October, the extension increases an existing supply order rather than introducing a newly designed powertrain. RENK and KNDS have not disclosed unit numbers or recipient nations, and the four-year delivery window does not identify how many transmissions will be used in newly built vehicles rather than replacement or support requirements.
The HSWL 354 is a major component of the vehicle’s powertrain. It transfers engine output into usable torque and speed for the tracks, while incorporating reversing, steering and service-braking functions. Combining these functions within one assembly reduces the need to design and package separate driveline systems around the engine and final drives. The transmission has been associated with the Leopard 2 since series production began in 1983.
RENK specifies the HSWL 354 for tracked vehicles typically weighing between 50 and 70 tonnes, with power inputs from 900 to 1,300 kilowatts. Its current product information lists four forward and four reverse ratios, integrated steering and braking, and a unit mass of 2,250 kilograms without oil. These are specifications for the product family, not a statement that every Leopard 2 variant uses an identical internal configuration.
A hydromechanical transmission combines mechanical gearing with hydraulic torque-management functions. This arrangement allows torque conversion and controlled gear changes while the vehicle is under load. Steering arrangements must vary the relative motion of the tracks so that a heavy vehicle can turn without treating its transmission as a simple road-vehicle gearbox. Brake integration is equally important because slowing a 50- to 70-tonne tracked platform produces substantial loads and heat.
The associated control system determines how the transmission responds to vehicle operating demands. Electronic control and driver inputs must be coordinated with the gear selection process to avoid unnecessary drivetrain loads and maintain predictable mobility. The TCS-354A control unit and G4MA11 gear selector are specifically named in the new order, confirming that the package extends beyond the mechanical transmission casing and its internal components.
Manufacture of an integrated driveline assembly requires controlled production of gears, bearings, friction elements, hydraulic components and seals, together with consistent electronic control hardware. Assembly testing must establish how the transmission shifts, steers and brakes under specified loads. Neither company has disclosed a revised factory output rate or a new production facility associated with the October extension.
RENK began building its 4,000th HSWL 354 at Augsburg in June 2026, a milestone in a product line that has been maintained and developed over several decades. Long production histories create an established base of manufacturing methods and in-service knowledge, although they also require management of changes to components and support equipment as vehicle variants evolve. The new contract stretches deliveries into the following decade, making configuration management and availability of long-life components part of the industrial requirement.
KNDS says approximately 3,300 Leopard 2 tanks and family vehicles are in use across the armed forces of 23 countries. That installed base includes equipment at different points in its life cycle, from recently procured vehicles to older variants requiring maintenance and modernisation. It does not follow that the latest €130 million order supplies all those fleets; the customer allocation has not been identified.
Work to expand Leopard production is taking place across more than one European site. IN Defence previously reported the start of a Leopard 2A8 assembly operation in Lithuania, a separate development involving local industrial capacity. The new transmission commitment concerns a specific propulsion supply chain feeding Leopard family production and support. Its delivery dates therefore cannot be directly equated with the handover schedule of a particular national tank order.
Long-term vehicle support depends on continued availability of compatible transmission assemblies, diagnostic information and trained repair personnel. Because the HSWL 354 incorporates steering and braking as well as gear changes, servicing it involves multiple linked functions. The new contract does not specify the number of spare parts, repair arrangements or in-service support obligations.
RENK chief executive Alexander Sagel and KNDS Deutschland chief technology officer Axel Scheibel cited production capacity and timely vehicle delivery in the agreement announcement. The €130 million extension secures transmission assemblies and related controls for delivery from 2029 to 2032. The companies have not disclosed the number of units or their allocation to national Leopard 2 programmes.
