National Crane Published 10-30-2014 Control # 040-09 5-27
1400H OPERATOR AND SERVICE MANUAL SERVICE
FIVE SECTION BOOM MAINTENANCE
Do not, under any circumstances, work at an
elevated height without using proper fall protection as
required by local, state or federal regulations.
Internal Cable Sheave Lubrication
Special Tools: Nozzle or needle grease gun fitting. The
lubrication points on the sheaves are not equipped with
grease fittings (zerks), therefore a 0.25 in (6,35 mm)
diameter nozzle grease gun tip will be required. Contact the
National Crane Product Support Department to obtain this
nozzle tip (NCC PN 955047), or numerous variations of the
nozzle tip can be purchased at local hardware or auto parts
retail outlets.
NOTE: Observation through the sheave case for the
extend sheaves and the hoist mount for retract sheaves
will visually determine the amount of grease necessary
for proper lubrication. A slight amount of grease
extrusion around the pin joint is adequate for proper
lubrication.
Lubrication of the extend cable sheaves located on the
boom tip end of the extend cylinder, and the retract cable
sheaves located on the inside rear of the 2nd and 3rd section
and the extend cable sheave attached to the bottom of the
top plate of the second section at the sheave case end of the
boom, are accomplished as follows:
1. Extend boom 78 in (198 cm) per section 26 ft (792 cm)
for a five section boom.
2. Visually check alignment between the grease access
holes for the retract sheaves, when the holes align, the
end of the extend cable sheave pin will be accessible
thru a hole in the 3rd section side plate for lubrication.
3. Grease all pins accessible at this boom length location
with nozzle grease gun fitting.
4. The extend cable sheave located on the bottom of the
top plate of the 2nd section at the sheave case end of
the boom can be accessed at any boom length for
lubrication.
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