CRANE - JIB EXTENSIONS

TM 5-5420-279-23

CRANE - JIB EXTENSIONS

This task covers:

a. Remove

b. Install

INITIAL SETUP:

Tools Required

Tool Kit, General Mechanic's, Automotive (GMTK)

Materials Required

Thread locking compound, loctite 243

Equipment Conditions

Crane unfolded

Remove the extension cylinder assembly. See direct support maintenance procedure

6-053.

Remove the jib box bolts and washers securing the spacer and plate mounting.

See direct support maintenance procedure 6-061.

NOTE

There are three boom jib extensions, which fit inside each other.

Remove

(1)

Remove the jib extension cylinder assembly (1, 8 and 14) and place on a suitable working

surface.

(2)

Remove bolts (12) and washers (13).

(3)

Remove the plate mountings (11) and spacer plates (10) from jib extension number two

(8).

(4)

Remove jib extension number three (14).

(5)

Remove bolts (6) and washers (7).

(6)

Remove the plate mountings (4) and spacer plates (5) from jib extension number one (1).

(7)

Remove jib extension number two (8).

(8)

Check the spacer plates (2, 9 and 15) on each of the boom jib extensions for wear.

(9)

Check the spacer plates (3,5,9 and 11) on each of the boom jib extensions for wear.

(10)

Check all threaded components for damage and wear.

(11)

Check the jib extensions for cracking, damage and wear.

(12)

Replace components as necessary.