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Published 10/19/2017, Control # 618-00
GRT880 SERVICE MANUAL SWING SYSTEM
consists of maintaining the gearbox oil level. Oil in a new
gearbox should be drained and flushed out after
approximately 250 hours of operation, and replaced with
premium quality AGMA No. 4 EP gear lube after
approximately 500 hours of operation or each year,
whichever occurs first. Operation in high humidity or polluted
air areas will require more frequent changes to minimize
moisture or contaminate accumulation. Change the oil as
follows.
a. Unscrew drain plug. Remove breather and dipstick to
ensure all oil has been removed.
b. Flush case with a light flushing oil.
NOTE: Cleaning gearbox with a solvent is recommended
to prevent accumulation of grit and grime. Avoid
steam cleaning where moisture and dirt might be
driven into the swing bearing.
c. After oil is drained, replace drain plug and any other
plugs removed to drain oil.
d. To refill with oil, make sure breather is open. Fill to
proper location on dipstick.
e. Tighten breather and dipstick.
Checking the Oil Level
a. Check level on dipstick
b. If no lubricant is visible on dipstick, add GL-5 until
between minimum and maximum on dipstick
c. Replace dipstick in brake housing.
Testing
1. Test swing of superstructure in each direction. Stop and
start swing several times.
2. Inspect for hydraulic leaks and repair as necessary.
Reference Only
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