(2) Inspect for worn or stripped threads
multimeter to the two terminals of
on mounting and terminal hardware,
the resistor.
defective wiring, and general condi-
(2) Resistance should measure 5.0 ohms
tion. Repair or replace the contactor
10 percent.
as required.
(3) Replace a resistor which does not
c. Testing.
meet these specifications.
(1) Use a multimeter set to a suitable ohm
scale and touch the probes of the mul-
the welding wire feed control rheostat, rheo-
timeter to the two coil terminals.
stat resistor, and fuse holders.
(2) The average resistance should read
240 ohms, with a maximum allowable
53. Contractor
resistance of 252 ohms and a mini-
a. Removal.
mum allowable resistance of 226
(1) Refer to paragraph 51 and remove the
ohms.
cable assembly.
(3) Replace a defective contactor or report
(2) Refer to figure 14 and remove the
a repairable contactor to field mainte-
contactor.
nance.
b. Cleaning and Inspection.
d. Installation.
(1) Refer to figure 14 and install the
(1) Clean the contactor with a dry, lint
contactor.
free cloth or with compressed air.
27
