Manitowoc National Crane NBT30H-2, Руководство по обслуживанию

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03-20-2019 Control # 613-06
INTRODUCTION NBT30H-2 SERVICE MANUAL
GENERAL MAINTENANCE
The suggestions listed below are helpful in analyzing and
correcting problems:
• Determine the problem.
• List possible causes.
• Devise checks.
• Conduct checks in a logical order to determine the
cause.
• Consider the remaining service life of components
against the cost of parts and labor to replace them.
• Make the repair.
• Test the equipment to ensure the problem is fixed.
NOTE: Safety is the number one consideration when
working around machines. Safety is a matter of
understanding the job to be done and the application
of good common sense. It is not just a list of do’s and
don’ts. Stay clear of all moving parts.
Cleanliness
Cleanliness is important in preserving the life of the machine.
Keep dirt out of working parts and compartments. Keep
filters and seals clean. Whenever hydraulic, fuel, lubricating
oil lines, or air lines are disconnected, clean the adjacent
area as well as the point of disconnect. Cap and plug each
line or opening to prevent entry of foreign material.
Clean and inspect all parts. Be sure all passages and holes
are open. Cover all parts to keep them clean. Be sure parts
are clean when they are installed. Leave new parts in their
containers until ready for assembly. Clean the rust
preventive compound from all machined surfaces of new
parts before installing them.
Removal and Installation
Do not attempt to manually lift heavy parts that require
hoisting equipment. Do not put heavy parts in an unstable
position.
When raising a portion or a complete crane, ensure the
weight is supported by blocks rather than by lifting
equipment.
W h e n u s i n g h o i s t i n g e q u i p m e n t , f o l l o w t h e h o i s t
manufacturers recommendations. Use lifting devices that
achieve the proper balance of the assemblies being lifted.
Unless otherwise specified, use an adjustable lifting
attachment for all removals requiring hoisting equipment.
Some removals require the use of lifting fixtures to obtain
proper balance.
All supporting members (chains and cables) need to be
parallel to each other and as near perpendicular as possible
to the top of the object being lifted.
If a part resists removal, check to be sure all nuts and bolts
have been removed and that an adjacent part is not
interfering.
Disassembly and Assembly
Complete each step in turn when disassembling and
assembling a component. Do not partially assemble one part
and start assembling some other part. Make all adjustments
as recommended. Always check the job after it is complete
to see that nothing has been overlooked. Recheck the
various adjustments by operating the machine before
returning it to the job.
Pressing Parts
When one part is pressed into another, use an anti-seize
compound or a molybdenum disulfide base compound to
lubricate the mating surfaces.
Assemble tapered parts dry. Before assembling parts with
tapered splines, be sure the splines are clean, dry, and free
from burrs. Position the parts together by hand to mesh the
splines before applying pressure.
Parts which are fitted together with tapered splines are
always very tight. If they are not tight, inspect the tapered
splines and discard the part if the splines are worn.
Locks
Lock washers, flat metal locks, or cotter pins are used to lock
nuts and bolts. For flat metal locks, bend one end of the lock
around the edge of the part and the other end against one
flat surface of the nut or bolt head.
Always use new locking devices on components which have
moving parts.
Use a steel flat washer between aluminum housings and
lock washers.
Shims
When shims are removed, tie them together and identify
them as to location. Keep shims clean and flat until they are
reinstalled.
CAUTION
The capacity of an eyebolt diminishes as the angle
between the supporting members and the object
becomes less than 90°. Eyebolts and brackets should
never be bent and should only have stress in tension.