Manitowoc Published 10-09-2020, Control # 259-06 5-21
MLC80A-1/MLC90A-1/MLC100A-1/MLC100-1 SERVICE/MAINTENANCE MANUAL HOISTS
DRUM GEARBOX OIL CHANGE
Drum gearbox maintenance consists of periodically checking
the level and changing the oil in each drum gearbox.
Gear Oil Specifications
For gear oil specifications and gearbox capacities, see the
Lubrication Guide supplied with the crane.
Oil Analysis
An oil analysis program is the best way to determine the
optimum oil change interval and the condition of the drum
gearboxes.
Periodic Maintenance
Initial Operation
Drain and refill each drum gearbox after the first 200 hours of
engine operation.
Monthly
Check the oil level in each drum gearbox monthly or every
200 hours of engine operation, whichever occurs first.
Yearly
Drain and refill each drum gearbox yearly or every 400 hours
of function operation or every 2000 hours of engine
operation, whichever occurs first, unless an alternate interval
has been established through an oil analysis program.
Quick-Drain Valve
Each gearbox for Drums 1, 2, and 4 is equipped with a quick-
drain valve that requires use of the quick-drain drainer
assembly (see Figure 5-15
). The quick-drain drainer
assembly is stored in the parts box supplied with the crane.
To prevent oil contamination, thoroughly clean the
quick-drain drainer assembly before and after each use.
Oil Change Procedure
The oil change interval may be adjusted according to the
results of an oil analysis program.
Change the oil when the gearbox is warm, not hot.
NOTE: To prevent harmful contaminants from entering a
gearbox, thoroughly clean components before
disconnecting or connecting them.
See Figure 5-14
for the following procedures.
Drums 1, 2, and 4
1. Lockout-tagout the crane.
2. Remove the dust cap from the quick-drain valve (4).
3. Place the hose from the quick-drain drainer assembly
into an suitable container for collecting the drained oil.
Refer to the Lubrication Guide for oil capacities.
4. Thread the quick-drain drainer assembly to the quick-
drain valve. The poppet inside the valve will open
allowing the oil to drain from the gearbox.
5. Once the gearbox has finished draining, remove the
quick-drain drainer assembly.
6. Fasten the dust cap to the quick-drain valve.
7. Fill the gearbox with specified oil:
a. Remove the breather (1) from the fill port (2).
b. Disconnect the upper hose (6) to allow trapped air to
vent.
c. Add oil through the fill port using a suitable funnel
until the oil level is halfway up the sight gauge (5).
Do not overfill.
d. Securely reinstall the breather.
e. Install and securely tighten the upper hose.
8. Allow the oil to settle and recheck the oil level, as
required, after operating the drum.
9. Thoroughly clean the quick-drain drainer assembly and
store it in the parts box.
Drum 3
1. Rotate the drum so the fill, level, and drain plugs (6-8)
are aligned with the holes in the drum frame.
2. Lock out-tag out the crane.
3. Place a 26 L (7 gal) container under the drum.
4. Remove the fill, level, and drain plugs (6-8) and drain the
gearbox.
5. Once the gearbox has finished draining, securely
reinstall the drain plug (8).
6. Fill the gearbox with specified oil through the fill plug port
until the oil is just up to the bottom of the level plug port.
7. Securely reinstall the level and fill plugs (6 and 7).
8. Allow the oil to settle and recheck the oil level, as
required, after operating the drum.
9. Thoroughly clean up any spilled oil.
Motor Shaft Oil Cavity
If the motor for Drum 1, 2, or 4 is removed for servicing, the
motor shaft oil cavity must be filled with gear oil after the
motor is reinstalled.
1. Remove the fill plug (9).
2. Fill the cavity to the top with gear oil.
3. The oil level with equalizer with the gearbox.
4. Securely reinstall the fill plug.
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