TM 55-1930-209-14&P-13
3-19.2.2.1.3 Repair. Repair bow crane in accordance with the exploded illustrations in the FASSI Spare Parts Catalog in
Appendix B.
3-19.2.2.2
Bow crane anti-2-block control panel
WARNING
Make sure anti-2-block control panel is electrically dead before attempting maintenance.
Be sure to remove fuses from fuse box 9P14 near 24 Vdc power panel in workshop.
Redtag switchboard circuit breaker P16 and fuse box 9P14, after removing fuses, with:
"WARNING - DO NOT ACTIVATE. REPAIRS BEING MADE."
3-19.2.2.2.1 Cleaning and inspection
WARNING
Make sure anti-2-block control panel is electrically dead by removing fuses from fuse
box 9P14 near 24 Vdc power panel. Redtag fuse box with: "WARNING - DO NOT
ACTIVATE. REPAIRS BEING MADE."
a.
Wipe clean exterior of storage box with clean rag. Open storage box door and vacuum clean or clean inside with
electrician's brush. Avoid using solvents for cleaning inside of storage box. Solvents leave greasy film that may
reduce electrical conductivity of components.
b.
Visually check for indications of burns, loose connections, or damage. Clean corrosion from terminals, tighten
loose connections, and repair damage.
3-19.2.2.2.2 Test
With fuse box 9P14 fuses installed and 24 Vdc power panel power ON, check input voltage across anti-2-block
control panel terminal board terminals TB1-1 and TB1-2. If voltage is not 24 Vdc, replace input wires to anti-2-block
control panel. If voltage is 24 Vdc, troubleshoot anti-2-block control panel as given in the Krueger Crane Systems
manual, Mark H Troubleshooting List, in Appendix B and/or as given in steps (1) thru (5). Replace faulty wires or
components as necessary.
(1)
With bow crane hook lowered, check voltage across terminal board terminals TB1-3 and TB1-2. If voltage
is 24 Vdc, go to step (2). If voltage is not 24 Vdc, replace fuse and/or wires from TB1 to fuse in anti-2-
block control panel.
(2)
Check voltage across terminals TB1-2 and TB1-6. If voltage is 24 Vdc, go to step (3). If voltage is not 24
Vdc, replace anti-2-block switch and/or connecting wires.
(3)
Turn horn switch on. Raise hook to trip anti-2-block switch and to energize horn and warning light. If
neither was activated, check voltage across terminals TB1 -2 and TB1-4. If voltage is 24 Vac, go to step
(4). If voltage is not 24 Vac, replace printed circuit dl relay and/or wire in anti-2-block control panel.
(4)
Check A-2-B, warning light, horn ON/OFF switch, and horn for fault. If fault exists, replace faulty part. If
no fault exists, go to step (5).
(5)
Disconnect wires to solenoid in anti-2-block control panel. Make sure that bow crane boom cannot be
extended and lowered and that hoist cannot be raised. Then connect a ground and a hot wire to the
solenoid. If bow crane does not function through all modes of operation, replace solenoid. If bow crane
still does not operate normally, troubleshoot bow crane as given in Table 3-2.
3-19
