National Crane 03-20-2019 Control # 613-06 1-1
NBT30H-2 SERVICE MANUAL INTRODUCTION
SECTION 1
INTRODUCTION
SECTION CONTENTS
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Service and Repair . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Supplemental Information . . . . . . . . . . . . . . . . . . . 1-2
New Owner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Basic Nomenclature . . . . . . . . . . . . . . . . . . . . . . . 1-2
General Maintenance . . . . . . . . . . . . . . . . . . . . . . . 1-4
Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Removal and Installation . . . . . . . . . . . . . . . . . . . 1-4
Disassembly and Assembly . . . . . . . . . . . . . . . . . 1-4
Pressing Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Shims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Hoses and Tubes . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Jump Starting Hazard . . . . . . . . . . . . . . . . . . . . . . 1-6
Charging the Battery . . . . . . . . . . . . . . . . . . . . . . . 1-6
Hydraulic Systems . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Hydraulic Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Fatigue of Welded Structures . . . . . . . . . . . . . . . 1-11
Loctite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Fasteners and Torque Values . . . . . . . . . . . . . . . 1-12
Weld Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Wire Rope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Environmental Conditions . . . . . . . . . . . . . . . . . . 1-26
Dynamic Shock Loads . . . . . . . . . . . . . . . . . . . . . 1-26
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Recommendations for Servicing Wire Rope . . . . 1-27
Wire Rope Inspection . . . . . . . . . . . . . . . . . . . . . 1-27
Boom Extension and Retraction Cables . . . . . . . 1-28
Wire Rope Replacement (All Wire Rope) . . . . . . 1-28
Seizing Wire Rope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
GENERAL
This manual has been compiled to assist you in properly
operating and maintaining your Model NBT30H-2 Series
National Crane (Figure 1-1).
Before placing the crane into service, all operators and
persons working around the crane must thoroughly read and
understand the contents of the Operator Manual. Before
moving a vehicle equipped with a crane, information relating
to transporting the vehicle must be read and observed.
This manual must be retained with the machine for use by
subsequent operating personnel.
Information in this manual does not replace federal, state or
local regulations, safety codes or insurance requirements.
For detailed information concerning the operation and
maintenance of the RCL system installed on the crane, see
the manufacturer’s manual supplied with the crane.
Manufacturers of rated capacity limiters may refer to them in
their manuals as a load moment indicator (LMI), a hydraulic
capacity alert system (HCAS), or a safe load indicator (SLI);
Manitowoc refers to these systems as a rated capacity limiter
(RCL) throughout its Operator and Service Manuals.)
This crane has been designed for maximum performance
with minimum maintenance. With proper care, years of
trouble-free service can be expected.
National Crane reserves the right to make specification and
equipment changes without notice because of product
improvements.
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