TM 5-3810-305-23
0016
SYMPTOM
NO LIGHT AND HORN BUT CONTROL DISCONNECTS WILL NOT ENGAGE
MALFUNCTION
Control Disconnect Defective.
CORRECTIVE ACTION
1.
Check voltage across disconnect terminals. If 24 VDC, check anti-two block BY-PASS switch in
anti-two block panel. If voltage is 0, repair or replace disconnect (check other disconnects for
condition). To operate crane, solenoid must have 24 VDC supplied to one side and have a good
ground on the other side. Under this condition, the disconnect should act as a solid link.
2.
With 24 VDC removed, disconnect should allow free motion of control lever in one direction and
operate valve spool in other direction.
MALFUNCTION
Anti-Two Block BY-PASS Switch Defective.
CORRECTIVE ACTION
1.
Check to ensure that anti-two block BY-PASS switch is in the OFF position.
2.
Check for 24 VDC in anti-two block panel. If present, replace anti-two block BY-PASS switch or
anti-two block panel (WP 0067).
MALFUNCTION
Wire Broken or Bad Connection.
CORRECTIVE ACTION
1.
Check voltage across disconnect terminals.
2.
If voltage is 0, check voltage across terminals in the anti-two block panel. If 24 VDC, replace wire.
If 24 VDC across disconnect, disconnect is defective.
MALFUNCTION
Function Disconnect Defective.
CORRECTIVE ACTION
1.
Check solenoid for function. Applying 24 VDC to disconnect, solenoid should engage with a
distinct snap.
2.
If not, solenoid must be replaced. If solenoid engages but disconnect "breaks" under load,
replace disconnect.
END OF WORK PACKAGE
0016-4
03/15/2011Rel(1.8)root(tswp)wpno(T00021)
