MAIN DRIVE – SEW-EURODRIVE PLANETARY GEAR MOTOR

WARNING

Disconnect main power supply before performing maintenance.

Lockout/tagout the spiral according to your company’s lockout/tagout before performing maintenance.

WARNING

Risk of burns due to hot gear unit and hot gear unit oil.

  • Let the gear unit cool down before you start working on it.

 

Inspection and maintenance intervals

Time interval What to do?
  • Daily
  • Check the housing temperature:
    • Mineral oil: max 90°C
    • Synthetic oil: max 100°C
    • Check for gear unit noise.
  • Monthly
  • Check the gear unit for signs of leakage.
  • Check the oil level.
  • After 500 operating hours
  • First oil change after initial startup.
  • Every 3000 operating hours, at least every 6 months
  • Check the oil consistency.
  • Visual inspection of the seals for leakage.
  • Depending on the operating conditions, at least every 12 months
  • Check whether retaining screws are tightly secured.
  • Check breathers, replace if necessary.
  • Check the alignment of the input and output shaft.
  • Depending on the operating conditions, at least every 3 years
  • Change mineral oil.
  • Replace rolling bearing grease (recommendation)
  • Replace oil seal (do not install it in the same track)
  • Depending on the operating conditions, at least every 5 years
  • Change synthetic oil.
  • Varying (depending on external factors)
  • Touch up or renew the surfaces / anti-corrosion coating.
  • Check installed pipes.
  • Clean the outer gear unit housing.

 

NOTICE

Note that the planetary gear units and primary gear units have 2 separate oil chambers. Make sure both gear units are filled with the correct oil fill quantity.

NOTICE

Improper checking of the oil level may result in damage to the gear unit.

Check the oil level only when the gear unit is cooled down to room temperature.

Check the oil level again after a few operating hours.

Planetary gear unit oil dipstick

The oil dipstick and breather are combined in one unit.

  1. Unscrew the oil dipstick with breather and remove it.

  2. Clean the oil dipstick with breather.

  3. Re-insert the oil dipstick with breather by turning it hand-tight into the gear unit to the stop.

  4. Remove the oil dipstick with breather and check the oil level. The oil level must be between the markings.

  5. Proceed as follows if the oil level is too low:
    • Open the oil fill plug.
    • Fill in oil of the same oil grade until the oil is between the markings.
  6. If you filled too much, proceed as follows:
    • Place a suitable container underneath the oil drain plug.
    • Remove the oil drain plug.
    • Drain oil, until the oil level is between the markings.
    • Re-insert the oil drain plug.
  7. Screw in the oil fill plug.
  8. Screw in the oil dipstick with breather.

Primary gear unit sight glass

  1. Check the oil level on the oil sight glass. The oil fill quantity must not exceed the upper edge of the sight glass.
  2. Proceed as follows if the oil level is too low:
    • Open the oil fill plug.
    • Fill in oil of the same oil grade via the oil fill plug up to the center mark of the oil sight glass.
    • Screw in the oil fill plug.
  1. If you filled too much, proceed as follows:

    • Place a suitable container underneath the oil drain plug.
    • Remove the oil drain plug.
    • Drain oil, until the oil level is at the center mark of the oil sight glass.
    • Re-insert the oil drain plug.

Oil expansion tank

The oil expansion tank is designed to compensate for oil volume variations in the system caused by temperature fluctuations. When the gear unit temperature increases, the oil expansion tank absorbs some of the increasing oil volume and feeds it back to the gear unit as the temperature goes down, which means the gear unit is always completely filled with oil.

Based on the oil level specified by SEW-Eurodrive, the oil expansion tank is designed to compensate the oil volume change within the permitted operating temperature range. A temperature decrease below the permitted range causes the oil expansion tank to be completely emptied and air being sucked into the gear unit. This might result in insufficient lubrication and a malfunction of the gear unit. An increase above the permitted temperature range causes an overfilling of the expansion tank and oil might leak from the gear unit. During operation, any oil level above the level specified by SEW-Eurodrive is permitted as long as there is oil in the expansion tank and the oil expansion tank does not overflow. During operation, the oil level must not be below the minimum marking on the oil dipstick.

Changing the oil

NOTICE

Improper oil change may result in damage to the gear unit.

The oil grade and viscosity are listed on the nameplate of the gear unit.

An oil level above the maximum marking might indicate that foreign liquids (e.g. water) have entered. An oil level below the minimum marking might indicate a leakage. Find out and eliminate the cause before you fill in new oil.

Perform the oil change quickly after you have switched off the gear unit to prevent solids from settling. You should drain the oil while it is still warm. Avoid temperatures well above 50°C.

Always fill the gear unit with the same oil grade as before. Mixing oils of different grades and/or manufacturers is not permitted. Synthetic oils in particular must not be mixed with mineral oils or other synthetic oils. When switching from mineral oil and/or when switching from synthetic oil of one basis to synthetic oil of another basis, thoroughly flush the gear unit with the new oil grade.

When changing the oil, flush the gear unit interior thoroughly with oil to remove oil sludge, oil residue, and abrasion. Use the same oil grade you use to operate the gear unit. Fill in fresh oil only after all residues have been removed.

Remove any dripping oil immediately with oil binding agent. Dispose of the used oil in accordance with applicable regulations.

Planetary gear unit oil

  1. Place a suitable container underneath the oil drain plug.

  2. Remove the oil drain plug.

  3. Remove the oil dipstick with breather.

  4. Drain all of the oil.

  5. Screw in the oil drain plug again,

  6. Fill in new oil of the same grade through the oil filling hole.

    • Use a filling filter to fill the oil into the gear unit (maximum filter mesh 25 μm).
    • The oil quantities specified on the nameplate is an approximate quantity. The mark on the oil dipstick is the decisive indicator of the correct oil quantity.
  7. Screw in the oil dipstick with breather.

Primary gear unit oil

  1. Place a suitable container underneath the oil drain plug.

  2. Remove the oil drain plug.

  3. Remove the oil fill plug.

  4. Drain all of the oil.

  5. Screw in the oil drain plug again,

  6. Fill in new oil of the same grade through the oil filling hole.

    • Use a filling filter to fill the oil into the gear unit (maximum filter mesh 25 μm).
    • The oil quantities specified on the nameplate is an approximate quantity. The mark on the oil sight glass is the decisive indicator of the correct oil quantity.
  1. Screw in the oil fill plug.

Checking and cleaning the breather

NOTICE

Improper cleaning of the breather may result in damage to the gear unit.

Prevent foreign objects from entering into the gear unit.

Planetary/primary gear breather

  1. Remove any deposits near the breather.

  2. If the breather is clogged, replace it.

Inspecting the hollow shaft with shrink disc

NOTICE

Improper shrink disc installation may result in damage to the gear unit.

Tightening the locking screws without installed shaft may result in the hollow shaft being deformed. Only tighten the locking screws with the machine shaft installed.

Shrink disc

  1. Check for correct position of the shrink disc [2] on the gear unit hollow shaft [1].

    • The shrink disc is positioned correctly when the inner ring [4] is in contact with the hollow shaft shoulder [5].

  1. Check for correct position of the shrink disc on the machine shaft.

    • To guarantee a complete torque transmission from the gear unit to the machine shaft, push the gear unit onto the machine shaft until the shrink disc surface [6] contacts the machine shaft shoulder [7].
  1. First tighten the locking screws manually. Then tighten all locking screws by working round equally (not in diametrically opposite sequence) in 1/4 turn increments.

  2. Adhere to the tightening torque table below. Continue to tighten the locking screws evenly by working round in 1/4 turns until you reach the tightening torque.