HOISTS MLC165-1 SERVICE/MAINTENANCE MANUAL
5-20
Published 05-26-17, Control # 238-02
Drums 1 and 2 Gearbox with Free Fall Option
See Figure 5-16 for the following instructions.
NOTE To prevent harmful contaminants from entering the
gearbox, thoroughly clean components before
disconnecting or connecting them.
1. Lock out/tag out the crane.
2. Remove the dust cap (5) from the quick-drain valve (6).
3. Place the hose from the quick-drain drainer assembly
(Figure 5-15
) into a suitable container for collecting the
drained oil: 5.5 gallons (21L) of oil is required to fill a dry
gearbox.
4. Thread the quick-drain drainer assembly all the way
onto the quick-drain valve (6). 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 (5) to the quick-drain valve (6).
7. Fill the gearbox with specified oil:
MANUAL FILL PROCEDURE
a. Check that valve (4) is open. It is used only for the
power fill procedure.
b. Remove the breather (1a) from the fill port (2).
c. Add oil through the fill port (2) using a suitable
funnel until the oil level is halfway up the sight glass
(3). Do not overfill.
d. Reinstall the breather (1a) in the fill port (2).
POWER FILL PROCEDURE (recommended)
a. Close the shut off valve (4), or the oil will flow out the
breather (1b).
b. Remove the dust cap (5) from the quick-drain valve
(6).
c. Thoroughly clean the inside of the hose for the
quick-drain drainer assembly.
d. Thread the quick-drain drainer assembly all the way
onto the quick-drain valve (6). The poppet inside the
valve will open.
e. Connect the hose from the quick-drain drainer
assembly to a portable pump, either hydraulically
powered or hand powered.
f. Slowly pump oil into the gearbox until the oil level is
halfway up the sight glass (3). Do not overfill.
g. Once the gearbox is filled, remove the quick-drain
drainer assembly.
h. Fasten the dust cap (5) to the quick-drain valve (6).
i. Open the shut-off valve (4).
8. Recheck the oil level after operating the hoist. If
necessary, add oil through the fill port (2).
9. Thoroughly clean the quick-drain drainer assembly and
store it in the parts box.
.
Figure 5-16. Front or Rear Free Fall Drum Gearbox
Item Description
1 Breather (2)
2 Fill Port
3Sight Glass
4 Shut-Off Valve (shown open)
5Dust Cap
6 Quick-Drain Valve
1a
1b
3
4
5
6
2
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