TM 9-4940-549-14&P
Remove the rheostat as illustrated in figure 18-6.
Removal.
a.
Testing. Use a multimeter and test the rheostat and the direct cur-
b.
--
rent resistance element for smooth operation through out the range.
Test the rheostat for resistance of 121.5 plus or minus 5 percent.
Replace a defective rheostat.
Wipe clean using a lint-tree rag.
Cleaning.
c.
Install the rheostat as illustrated in figure 18-6.
Installation.
d.
Refer to schematic wiring diagrams.
a.
Disassemble the control cabinet as illustrated in fig-
Disassembly.
ures 18-7, 18-8, and 18-9.
Assemble the control cabinet as illustrated in figures
b.
Assembly.
