MAINTENANCE MLC650 VPC-MAX™ OPERATOR MANUAL
6-4
Published 04-06-18, Control # 231-14
Changing the Drum 5 Oil
The Drum 5 gearbox (1) is filled with gear oil and is not open
to the inside of the drum. Only the gearbox itself contains oil.
Drain and refill the gearbox every 1,000 hours.
NOTE: It is better to change the oil when gearbox is warm,
not hot.
See Figure 6-3
for the following procedure.
1. Position the crane in a level area.
2. Lower the fully assembled fixed mast onto 900 mm
(35.43 in) high blocking in front of the crane.
3. Lock out/tag out the crane.
4. To prevent contaminants from entering the gearbox,
clean the fill plug (2) and the area around the plug before
removing the plug.
5. Remove the fill plug.
NOTE: With the fill plug removed, air enters the gearbox,
allowing the oil to drain faster.
6. Place a suitable container under the drain plug (3).
7. Remove the drain plug and allow the oil to drain.
8. When the gearbox has finished draining, clean the drain
plug and the area around the drain plug opening.
9. Reinstall the drain plug.
10. Refill the gearbox with Mobilube SHC™ 75W-90 or an
equivalent until the oil level in the sight glass (4) is
halfway up the glass. Do not overfill the gearbox!
NOTE: To obtain an accurate level reading, the fixed mast
needs to remain in its lowered position, which puts
the sight glass at an approximately -7° angle (5).
11. Reinstall the fill plug.
12. Recheck the level after operating the mast.
FIGURE 6-3
Item Description
1 Drum 5 Gearbox
2 Fill Plug
3Drain Plug
4Sight Glass
5 -7° Angle
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