The CMM-GL unit is specifically engineered for the extraction of used oil from and the pumping of new oil into wind turbine gearboxes. Additionally, it has the capability to flush the gearbox using a specialized oil. This versatile machine is capable of servicing main and azimuth gearboxes, as well as blade angle of attack gearboxes.

Operating with both mineral and synthetic gearbox oils, the unit adheres to the following specifications:

• Kinematic viscosity at 40°C: 8–50 mm2/sec
• Density at 20°C: 800–950 kg/m3
• ISO 4406 purity class: -/19/16 or better

CMM-GL Gearbox Oil Changer Design

The CMM-GL is a single-axle trailer supporting both the control section and the process section, which includes hose reels. The control section doors are equipped with secure locks. External power is required for the unit, which is fully automated with a specialized controller managing the operation of pumps, valves, capacitance sensors, temperature sensors, flow switches, filters, manometers, and flow meters.

Modes of Operation

1. Used oil drain mode: The vacuum pump extracts oil from the gearbox into the vacuum chamber until it reaches capacity. Subsequently, a gear pump transports the oil to a prepared container.
2. Gearbox flushing mode: Oil is supplied by the gear pump to the required elevation (up to 60 meters) and is injected into the gearbox under pressure, effectively washing away the remaining old oil and particulate matter.
3. New oil supply mode: The gear pump supplies oil to the required elevation (up to 60 meters).

4. Filtration mode: During the pumping of new or flushing oil into the gearbox, the oil passes through a 15 μm filter for enhanced purity.