Maeda MK0003, Service Manual, Page: 342 / 348

6-14
Number Name Q'ty Item No.
1 Case 1
Item number: 551-4036800
2 Detector 1
Item number: S551-4041200
3 Grommet 1
Item number: N8711-27900 (C-30-NG-79-C Takigen)
4 Hexagon socket button head screw 2
M6 × 1.0 × 20L (plated)
5 Hexagon nut 2
M6 × 1.0 × Type 1 (plated)
6 Conical spring washer 2
Item number: 21721M06011 (nominal size 6 × 1H plated)
7 Protect weight 1
Item number: 200-4660500
8 Shackle 4
Item number: N7061-06000 (D-shackle 1/4")
9 Protective rope 400L 2
Item number: 541-4628700
10 Plate 1
Item number: 200-4656200
11 Sems bolt 2
Komatsu item number: 01024-81030
12 Plain washer 2 M10 × Regular circle (plated)
13 Hexagon nut 2
M10 × 1.5 × Type 1 (plated)
14 Over-hoisting detector relay cord 1
Item number: 200-4659200
15 Clamp 1 Item number: 22961-08100 (COT-08)
16 Sems bolt 1
Komatsu item number: 01024-80610
17 Blind connector holder 1
Item number: 200-4659600
2.1 OVER-HOISTING PREVENTION DEVICE
[1] OPERATION OF OVER HOIST PROTECTIVE DEVICE
(11) Weight
(12) Over hoist detector
(13) Hook block
When the hook block (13) approaches the tip of the jib and pushes up the
weight (11), the over-hoisting stop device sounds an alarm buzzer of the
crane operation part and warns over hoisting, and the moment when
monitor display of the over-hoist detector flashes in red, the following
operations stop automatically.
• Winding up of winch
• Main boom and jib extension
• Jib derrick-up
[2] INSPECTION OF OVER HOIST DETECTOR
When performing winch raising and main boom extension operation, jib
extension operation and jib hoist-up operation, respectively, with the hook
block (13) set to an over-hoist state, check that the alarm buzzer sounds,
and winch raising and main boom extension operation, jib extension
operation and jib hoist-up operation stop.
If the alarm does not stop sounding, the over hoist detector may be faulty or
the circuit may be open.
Check wire ropes for over hoist weight for damage and if any
abnormality is found, replace.