National Crane 03-20-2019 Control # 613-06 8-9
NBT30H-2 SERVICE MANUAL LUBRICATION
Check Hoist Brake Oil
To check the hoist brake oil, remove the inspection plug
(Figure 8-4) and visually inspect the oil level. The fluid
should be visible within the bottom of the inspection hole. If
more fluid is needed, add through the vent plug hole until oil
is at the bottom level of the inspection hole.
Drain /Add New Hoist Brake Oil
To drain and add new oil, remove the drain plug (Figure 8-4),
inspection plug and vent plug and drain the brake oil.
Reinstall drain plug and add fluid until the fluid is visible to
the bottom of the inspection hole. Reinstall the vent plug and
the inspection plug. See “Lubrication” on page 8-3.The hoist
brake fill capacity is 0.23 liter (.25 quart).
NOTE: Brake lubricants are satisfactory for operation in
temperatures from -23° C to 66° C
(-10° F to +150° F). For operation outside this
range, contact Manitowoc Crane Care for
recommendations.
.
Hoist Gearbox Oil
Check hoist gearbox oil level:
• Rotate the drum until the oil fill/level plug (Figure 8-5) is
visible in the inspection hole.
• Remove the fill/level plug and visually inspect the oil
level. The oil should be level with the bottom of the
inspection hole. If more oil is needed, add and reinstall
fill/level plug.
• To drain and add new oil, remove the vent plug
(Figure 8-5) and then screw a 1” pipe into the drain plug
hole to allow the oil to drain. Remove the drain plug with
a hex head socket and drain hydraulic oil. Remove the
1” drain pipe and install drain plug.
Fill hoist gearbox with oil.
• To fill with oil, rotate the drum so the fill/level port
(Figure 8-5) is visible through the upper hole. Install a 1”
pipe with elbow into the fill hole to assist in adding oil.
Remove fill/level plug with a hex socket and fill gear box
with gear lube oil. See “Lubrication” on page 8-3.
NOTE: Hoist gear lubricants are satisfactory for operation
in temperatures from -23° C to 66° C (-10° F to
+150° F). For operation outside this range, contact
Manitowoc Crane Care for recommendations.
Swing Gearbox and Brake Oil
Check Swing Gearbox oil level
The oil in the gearbox and brake sections is recommended
to be changed after first 50 hours of operation and every
1000 hours or 6 months of usage.
1. Examine the used oil for signs of significant metal deposits.
DANGER
Do not, under any circumstances, work at an elevated
height without using proper fall protection as required by
local, state or federal regulations.
DANGER
Do not use EP type gear lubes in the brake section. This
may prevent proper operation and cause the load to fall
resulting in serious injury or death.
FIGURE 8-4
7142
Brake Oil Vent/
Fill Plug
Brake Oil
Drain Plug
Brake Oil
lnspection
Plug
FIGURE 8-5
Gearbox
Oil Drain
(lower
hole)
Gearbox Oil Fill
(upper hole)
7756-2
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