National Crane Published 08/16/19 Control # 112-05 7-7
500E2 SERVICE MANUAL LUBRICATION
2. Check alignment between the 2
nd
section access hole
and the 3
rd
section access holes. When these holes
become aligned, the end of the extend cable sheave pin
is visible and accessible for lubrication.
3. This boom position also aligns the access holes at the
rear of the 1
st
section for lubrication of the retract
sheaves.
Inner Boom Pad Lubrication
1. With the boom fully retracted, apply grease to the wear
pads on the top of second boom section with a small
paint brush or a grease gun.
2. Extend boom to position the wear pad access holes
directly above the wear pads on the third boom section,
apply grease to the pads using the brush or gun.
3. Extend boom to position the wear pad access holes
directly above the wear pads on the fourth boom section,
apply grease to the pads using the brush or gun.
4. After grease is applied to all wear pads raise the boom to
the maximum angle and slowly extend the boom to full
extension and slowly retract completely.
5. Repeat steps 1 - 4 three times to ensure the boom is
fully lubricated.
Side and Bottom Boom Wear Pad
Lubrication
1. Fully extend and set the outriggers.
2. Lower the boom to horizontal.
3. Fully extend the boom and apply grease to the side and
bottom of the 2
nd
and 3
rd
sections with a brush.
4. Raise the boom to about 75° and retract the boom
5. Extend and retract the boom several times until the
grease is evenly spread.
6. Repeat steps 1-3 as necessary to ensure the boom is
fully lubricated.
Hoist Gearbox Oil
Use the following procedures to change the hoist gearbox oil
(Figure 7-1).
NOTE: Hoist gear and brake lubricants are satisfactory for
operation in temperatures from -10°F to +110°F (-
23°C to 43°C). For operation outside this range,
contact Manitowoc Crane Care for
recommendations.
Hoist Gearbox Oil Change
To change the hoist gearbox oil, rotate the drum so that the
plug is visible through the lower hole in the side plate (See
33, Figure 7-2, view 1). Screw in a piece of 1 inch pipe in the
gearbox oil drain to allow the oil to drain. Remove the
gearbox vent (30, Figure 7-2, view 1), then with a hex
wrench remove the drain plug located inside of the 1 inch
pipe (See Figure 7-2, view 2). Examine the used oil for signs
of significant metal deposits and then dispose of it in a proper
manner. Remove the 1 inch pipe.
Rotate the drum so that the port is visible through the
gearbox oil fill and level hole in the side plate (Figure 7-1).
Install a 1 inch pipe with elbow into the upper hole in the side
plate (See Figure 7-2, view 3). Fill the gearbox with
Item Component
1 First Section of Boom
2 Wear Pad Access Holes
3
Third
Section Wear Pads
1
2
3
Gearbox Oil Drain
Gearbox Vent
Gearbox Oil Fill
and Level
FIGURE 7-1
9871
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