National Crane Published 5-27-2018 Control # 039-06 4-3
800D LUBRICATION
Over lubrication of non-sealed fittings will not harm the
fittings or components, but under lubrication will definitely
lead to a shorter lifetime.
Grease fittings that are worn and will not hold the grease
gun, or those that have a stuck check ball, must be replaced.
When wear pads or rotation bearings are lubricated, cycle
the components and relubricate to ensure complete
lubrication of the entire wear area.
Wire Rope Lubrication
Wire rope is lubricated during manufacturing so the strands,
and individual wires in strands, may move and adjust as the
rope moves and bends. A wire rope cannot be lubricated
sufficiently during manufacture to last its entire life.
Therefore, new lubricant must be added periodically
throughout the life of a rope to replace factory lubricant which
is used or lost.
The surface of some ropes may become covered with dirt,
rock dust, or other material during their operation. This
covering can prevent field applied lubricants from properly
penetrating into the rope. Therefore, these ropes should be
cleaned before being lubricated.
The lubricant applied should be light bodied enough to
penetrate to the core of the rope. Lubricant may be applied
effectively by various methods. It may be dripped on,
sprayed on, or put on by brushing, but in any case it should
be applied at a place where the rope is being bent, such as at
a sheave. It should be applied at the top of the bend,
because at that point the strands are spread by bending and
are more easily penetrated. The service life of rope will be
directly proportional to the effectiveness of the method used
and amount of lubricant reaching the working parts of the
rope.
A proper lubricant must reduce friction, protect against
corrosion, adhere to every wire and be pliable and not crack
or separate when cold and yet not drip when warm.
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