MAAG™ PPU gear unit

The MAAG PPU for roller presses, horizontal mills and kilns is a three-stage gearbox with application-oriented input stage followed by two planetary stages. Thanks to the highly standardised and modular concept, ratio adjustments have no impact on delivery times.

FLSmidth MAAG Gear PPU gear unit for roller presses, horizontal mills and kilns
  • Technical Description
  • Customer Benefits


Originally developed to drive roller presses, the field of application has been expanded during the redesign: The PPU drive train is now an attractive option to drive small ball mills. The drive train consists of main motor, gearbox with foot, high and low speed coupling, oil unit, auxiliary drive and optional water injection.


  • Three-stage gear unit with input stage reduction (e.g. spur gear or bevel stage) and two planetary stages
  • Power range up to 4000 kW
  • Ratio 45–140
  • Input speed: 980–1800 rpm
  • Integrated oil tank
  • Bearing lifetime L10hm > 100,000
  • Left and right gear units are interchangeable (for roller presses)

Design concept 1987
The PPU concept of 1987 is established in the cement and minerals market.

Redesign 2013
With the objective of improving already proven technologies, MAAG has taken a critical look at the existing design and potential areas of use of the MAAG PPU, taking into consideration technological advances made in recent years. The results speak for themselves: using a more compact and modular desgin, we were able to reduce gear weight, size and cost, while at the same time improving functionality and delivery times.

Roller presses, horizontal mills, kilns and others
Industries: Cement production, minerals, mining and food

Design criteria
ANSI/AGMA 2101-C95
ISO 6336 and ISO 1328

Scope of supply

Input stage
For driving roller presses, the MAAG PPU is delivered with a spur gear input stage. Ratio requirements can easily be fulfilled simply by changing the wheels of the input stage, thereby providing the highest possible flexibility.

Lubrication unit

An oil supply unit with low-pressure pump, double oil filter and oil cooler are part of the scope of supply. For roller press drives, we offer a cost-effective solution with a single oil unit lubricating both gear units. The gear unit casing also serves as oil circulation tank.

Torque arm system
MAAG provides customised torque arm solutions such as balanced torque arm system (self-regulating system without foundation connection) or a single torque arm with torsion shaft for torque absorption into the foundation.

Auxiliary gear drive
The auxiliary gear drive has a high speed shaft with a sprocket wheel. Auxiliary drive and gear unit are connected via roller chains. Standard instrumentation
Allmetra, ABB or equivalent

Shrink discs
Tollok, Stüwe or equivalent

Torque limiting safety coupling
Voith, Malmedi or equivalent

Cardan shaft
Voith, GKN or equivalent 

Optional condition monitoring system
Excluded from our scope of supply is the condition monitoring system which helps to save money by enabling condition-based maintenance. We offer solutions of Prüftechnik or Dalog.

  • Reduced to the max: smaller, lighter and more compact design
  • Input stage exchangeable
  • Both senses of rotation possible 
  • Flexibility with modular and standardised design
  • Only five different types of bearings implemented
  • Ring gear is part of the casing
  • Cast and welded parts long operating life
Download the brochure
Watch the technical animation about MAAG PPU
ppu video
Redesign of PPU
Case story of PPU installation