TM 9-4940-568-20
2-130
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. HOIST DOES NOT LOWER WITH REMOTE CONTROL (CONT).
Test 4.
Tag and mark connectors on hoist controller switches. Remove the connectors from
the two controller switches. Check each switch for continuity between the following
switch terminal locations, with the controller lever in the position noted:
Switch Terminals:
Controller handle position:
Test results:
Check 1
NC to COM
Neutral
Continuity
Check 2
NO to COM
Neutral
No continuity (open)
Check 3
NC to COM
Full UP position
No continuity (open)
Check 4
NO to COM
Full UP position
Continuity
If the above test results are not obtained, replace switch(es). Refer to paragraph
5-12 in this manual.
If the above test results are obtained, reinstall the controller switch connectors and
go to Test 5.
