TM 5-3805-258-24-1
9 5 0 B O P E R A T O R ’ S S T A T I O N
E L E C T R I C A L
T R O U B L E S H O O T I N G
D. If the magnet did not make the solenoid activate, disconnect the switch
harness from machine harness. Make an electrical test of the pin and
connections in the plug of the machine harness. With the power key
switch turned “ON”, Sockets 2 and 3 must each have power (use the
5P7277 Voltage Tester connected to machine ground); Pin 1 must not
have power. Turn the power key switch “OFF” and check for continuity
to machine ground on Pin 1 (use 8S4627 Circuit Tester). If these pins
and sockets do not test correctly, look at the schematic and find the
causes.
E. If the machine harness test is correct but the kickout still does not work,
connect a (jumper) wire from the negative terminal (the P/W wire) of
the solenoid to machine ground. With the power key switch turned
“ON”, the solenoid must activate each time the wire is put to machine
ground. If the solenoid does not activate, check for +24 volts with the
5P7277 Voltage Tester at the positive (R/O wire) terminal of the
solenoid while grounding the negative terminal of the solenoid. If vol-
tage is present, replace the solenoid. If voltage is not present, look at the
schematic and find the causes.
F. If all of the other tests are correct, make a replacement of the 9G117
Switch Assembly.
If the lift kickout works the first time, but then the solenoid keeps activated
and will not release, this is an indication that +24 volts is not sent to Socket 2 of
the switch by the R/O wire of the machine harness. The switch works the first
time from current through the solenoid. After the solenoid is activated, there is
not enough current for the switch to work so the solenoid keeps activated. Make
another check to be sure that the R/O wire that goes to Socket 2 of the harness
plug does have power when the switch plug is connected to it. To do this, push
the point of the 5P7277 Voltge Tester through the insulation of the R/O wire. If
the switch for sure gets +24 volts at Socket 2, and the system still latches up
(the solenoid does not disconnect), make a replacement of the 9G117 Switch
Assembly.
Bench Test of 9G117 Switch Assembly
Connect the switch as in the following schematic. Move a 5V2787 Magnet
over the 9G117 Switch Assembly at a distance of 6.4 to 9.0 mm (.25 to .35 in.).
The solenoid must activate for about .5 seconds; it must then deactivate (be not
activated).
Bench Test of Lift Kickout Switch
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