TM 9-4910-663-34
3-7.
RHEOSTAT ASSEMBLY (R18, fig 2-5)
a.
Description. The rheostat assembly consists of a carbon pile that is used to limit current during testing of starters
on the test stand.
b.
Repair Instructions. It must be removed from the test stand for repair. Refer to paragraph 2-14 for removal
instructions.
(1)
Remove the four 1/4-20 screws from the plate (lower) end of the rheostat assembly, and remove the plate.
(2)
Remove the insulator and lower brass contact plate.
(3)
Remove and replace the defective carbon pile plates.
(4)
Install the lower brass contact plate and the insulator.
(5)
Install the end plate and secure it with four 1/4-20 screws.
3-8. LINK BOARD ASSEMBLY (fig 2-8)
a.
Description. The link board assembly consists principally of 8 copper links and associated connecting studs.
The links provide means for changing circuit connections for input AC voltage (230/460) conversion. Repair of the link
board assembly is limited to removal and replacement of studs that may have damaged threads.
b.
Removal and Replacement of Studs. The removal procedure for the link board assembly is provided in
paragraph 2-15.
(1)
Remove the links from the studs.
(2)
Remove the mounting hardware from the defective stud, and remove the stud.
(3)
Replace the defective stud, install the stud mounting hardware, and install the links on the studs.
3-9. SPEED CONTROL COMPONENTS AND CURRENT TRANSFORMER (C. T.) PANEL BRACKET ASSEMBLY
a.
Description. The SPEED CONTROL and associated parts (fig 3-1) provide a means for manual adjustment of
the speed of the output shafts of the varidrive assembly and the C.T. panel bracket assembly contains current
transformers used with the instrument panel AC ammeter, and a resistor used with the coil of starter MS1. Repair of the
SPEED CONTROL components is limited to removal and replacement of defective parts. Repair of the C.T. panel
bracket assembly consists of testing to locate the defective part, and removal and replacement of that part.
3-18
