How to check the pitch drive planetary gearbox of a wind turbine?

Inspection and maintenance  the pitch planetary gear box of wind turbines includes the inspection and maintenance of the components such as pitch drive planetary reduction gearbox and pinion, pitch motor, pitch control cabinet and accessories. The details are as follows:

1, pitch drive planetary gear reducer and pinion
Appearance inspection
(1) Check whether the anti-corrosion coating on the surface of the planetary transmission reducer has the phenomenon of peeling off; if planetary reducer needs to be repaired, please planetary gearbox manufacturer-SGR ;
(2) Check if the oil level mirror of the pitch drive planetary transmission reducer is in good condition;
(3) Check the pinion surface is pitting, excessive wear and broken teeth.
Noise check
Manually pitch each blade to check for noise in the pitch planetary gearboxes .
Backlash check
(1) with a feeler to check pitch gear and pitch ring gear meshing gap, the normal meshing gap 0.3 ~ 0.9mm.
(2) backlash measurement method: first ensure that the pitch ring gear tooth side of the tooth surface and the corresponding pinion gear meshing completely,  then use the feeler to measure the pinion gear other side and Minimum engagement clearance of pitch ring gears.
Torque inspection of planetary reducer / hub mounting bolts
Inspect the pitch head / hub mounting bolts at the specified torque, and check the torque values in accordance with the design requirements.
Torque inspection of planetary reducer /  hub mounting bolts

Inspect the pitch head / hub mounting bolts at the specified torque, and check the torque values in accordance with the design requirements.
Check the oil level of the planetary reduction gearbox
Check if the oil level of the planetary reducer is normal (the oil level should be in the middle of the observation window). If the oil level is low, check whether the pitching planetary gear oil leaks and replenishes the oil. Repair work and refueling work is completed, the planetary reducer clean up;
NOTE: The planetary reduction gearbox should be set at 6 o’clock during refueling or oil level check.
planetary reduction gearbox lubricating oil supplement and replacement program (the pitching planetary transmission reducer lubricating oil to add the same process, the main difference is that  heavy vertical planetary gearboxes fueling port location and seal the form of slightly different):
Note: When filling lubricating oil to prevent foreign matter falling into the planetary reduction gearbox, oil drain oil should be carried out in the state of heat, when the ambient temperature is too low, planetary reducer should be added to the amount of pre-heated new oil  .
(1) with a towel to clean up the grease around the nozzle and oil;
(2) Unscrew the fuel plug and place it on a clean towel;
(3) the oil down into the planetary gear set along the nozzle (due to the small fuel nozzle, the actual refueling can be used when the large clean cylinder as a fuel tool), while oil side oil level through the mirror to observe the oil level;
(4) When the oil level close to normal oil level, stop refueling (which can be used in the normal oil level mark with a marker);
(5) clean the fueling plug and screw to the fuel nozzle, tighten;
(6) run the planetary reduction gearbox 5 minutes to observe whether the fuel nozzle at the leakage phenomenon, if any;
(7) Stop the planetary gear set re-observe the oil level, such as the oil level reaches the normal end of the refueling work, such as failure to meet the requirements of repeat steps (2) ~ (6) until the oil level to meet the requirements.
(8) If you change the oil, you can replace the lubricating oil planetary transmission gearbox at 10 o’clock or 2 o’clock position, the empty container is placed under the planetary transmission gearbox oil plug, unscrew the fuel plug, let the oil into the container Inside. After all the flow of oil to be, with a towel to clean up the fuel nozzle and its surroundings, cycle fuel plug. (1) – (7) when the planetary reduction gearbox is turned back to the 6 o’clock position to complete the supplementary work of lubricating oil.

2, Pitch drive gear motor inspection and maintenance
(1) Check whether the anti-corrosion coating on the surface of the pitch drive reducing motor has the phenomenon of peeling off, if it is necessary, repair, please contact planetary gearbox manufacturer-SGR;
(2) Check the appearance and fixation of the pitch-reducing motor cable, if the cable is damaged or fixed loosening situation must be dealt with immediately;
(3) manually for each blade pitch, check the pitch drive planetary reduction gear motor for the presence of noise;
(4) Check the pitch drive planetary gear  motor / variable pitch reducer mounting bolts.
3, accessories inspection
(1) whether the limit switch is intact, fixed is solid;
(2) whether the proximity switch is intact;
(3) the proximity switch and the distance between the sensor is appropriate (3-5mm);
(4) check the limit working position and proximity switch at the sensor mounting bolts are solid;
(5) Check the limit working position and the proximity switch whether the sensor piece deformation (bending angle of approximately 90 degrees is normal).
4, the pitch control cabinet inspection
(1) Check whether the triangular bracket fixing circlip is intact;
(2) check the connection cable insulation is aging, damaged;
(3) Check the pitch control cabinet / hub mounting bolts with the specified torque;
(4) check the elastic support is aging or cracks, if the above-mentioned circumstances, must be replaced immediately.
(5) open the pitch control cabinet, visual electrical components are obvious device burned and fixed line is not strong and other issues. If there are problems, timely find, analyze the reasons and timely processing and records.
(6) Use hexagon socket wrench or wrench to tighten the line card of the cable protection sleeve between the cabinet to ensure that there is no looseness and avoid the wear of the cable and the cable protection sleeve. If there is a problem with cable shaking, it must be secured with a cable tie. Check the fixing of the wiring plug on the back of the pitch control cabinet.
(7) Check the pitch of the planetary reducer motor power cord, encoder wire, brake wire fixed to ensure that no banding with the phenomenon of falling off to ensure that no loose wiring to ensure that the first Gulan no loosening.