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National Crane 1-21-2019 Control # 104-07 4-7

1400A SERVICE MANUAL BOOM MAINTENANCE

FIVE SECTION BOOM

The five section boom is powered by a two-stage double-

acting hydraulic cylinder. The cylinder is attached to and

supports the 1

, 2

, and 3

boom sections. Extend and

retract cables in the boom extend and retract the 3

, 4

and 5

sections. The 5

boom section extend cables are

attached to the base of the 3

section, reeved around

sheaves at the tip of the 4

section, and attached to the

base and support the 5

section. The 3

boom section

retract cables are attached to the base of the 5

section,

reeved around sheaves at the base of the 4

section, and

attached to the tip of the 3

section. The 4

boom section

extend cables are attach to the base of the 2

section,

reeved around sheaves at the tip of the 3

section, and

attached to the base and support the 4

section. The 2

boom section retract cables are attached to the base of the

section, reeved around sheaves at the base of the 3

section, and attach to the tip of the 2

section. The 3

boom section extend cables are attached to the base of the

section, reeved around sheaves at the tip of the 2

section, and attach to the base of the 3

section. The 3

boom section retract cables are attach to the base of the 3

section, reeved around sheaves at the base of the 2

section and attached to the tip of the 1

section.

The 3

section retract cables are directly oppose the

section extend cables to ensure that the 2

and 3

sections extend and retract equally at all times. The 4

section retract cables directly oppose the 4

section extend

cables to ensure that the 3

and 4

sections extend and

retract equally at all times. The 5

section retract cables are

directly oppose the 5

section extend cables to ensure that

the 4

and 5

sections extend and retract equally at all

times.

For information about cable tensioning, see “Cable

Tensioning” on page 4-17.

Internal Cable Sheave Lubrication

Special Tools: Nozzle or needle grease gun fitting. The

lubrication points on the sheaves are not equipped with

grease fitting, therefore a 6.35 mm (0.25 inch) diameter

nozzle grease gun tip is required. Contact the National

Crane Product Support Department to obtain this nozzle tip,

or numerous variations of the nozzle tip can be purchased at

local hardware or auto parts retail outlets.

NOTE: A small amount of grease extrusion around the

internal sheaves is sufficient lubrication. From the

front of the boom, look back through the boom

nose to observe the extend sheaves. From the

back of the boom, look up through the hoist mount

to observe the retract sheaves.

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 2

and 3

section and the

extend cable sheave attached to the bottom of the top plate

of the 2

section at the sheave case end of the boom, are as

follows:

1. Extend the boom 198 cm (78 inches) per section

792 cm (26 ft) 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

through a hole in the 3

section side plate for

lubrication.

3. Grease all pins accessible at this boom length location

with nozzle grease gun fitting.

5th Section

Section

Section Extend

Section Retract

FIGURE 4-2

Extend Cable Sheave

DANGER

Do not, under any circumstances, work at an elevated

height without using proper fall protection as required by

local, state or federal regulations.

Reference

Only

Brand	Manitowoc
Model	1400A
Category	Construction Equipment
Language	English

Manitowoc 1400A User Manual

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Manitowoc 1400A Specifications

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