Manitowoc Published 05-26-17, Control # 238-02 5-19
MLC165-1 SERVICE/MAINTENANCE MANUAL HOISTS
DRUM GEARBOXES
Each drum gearbox is filled with gear oil and is not open to
the inside of the drum. Only the gearbox itself contains oil.
Maintenance consists of periodically checking the level and
changing the oil.
Gear Oil Specifications
For gear oil specifications, see the Lubrication Guide
supplied with the crane.
Oil Analysis
An oil analysis program is the best way to determine the
optimal oil change interval and the condition of the drum
gearboxes.
Periodic Maintenance
Initial Operation
Drums 1 and 2 without free fall, Drum 3, and Drum 4: drain
and refill the gearboxes after the first 150 hours of operation.
Drums 1 and 2 with free fall: drain and refill the gearboxes
after the first 200 hours of operation.
Monthly or 200 Hours
Check the oil level in the drum gearboxes every 200 hours of
operation or monthly, whichever occurs first. For details, see
the Lubrication Guide supplied with the crane.
Every 6 Months or 1,000 Hours
Drain and refill the drum gearboxes every 1,000 hours of
operation or every 6 months, whichever occurs first.
Quick-Drain Valve
Each drum gearbox is equipped with a quick-drain valve
which requires use of the quick-drain drainer assembly
shown in Figure 5-15
. The quick-drain drainer assembly is
stored in the parts box supplied with the crane.
Oil Change Procedure
The oil change interval may be adjusted according to the
results of an oil analysis program.
Change the oil when the gearboxes are warm, not hot.
Gearbox
Oil Change
Procedure
Drums 1 and 2 with Free Fall Option page 5-20
Drums 1 and 2 without Free Fall Option page 5-21
Drum 3 page 5-22
Drum 4 page 5-26
Figure 5-15. Quick-Drain Drainer Assembly
Item Description
1 Quick-Drain Drainer
2 Hose Clamp
3 Hose: 3/4 in (19 mm) Inside Diameter by 10 ft (3,0 m) Long
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