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Disassembly. - TM-10-3930-620-340049
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TM-10-3930-620-34 Truck Lift Fork Solid Rubber Tired Wheels 6000 Capacity 180 Inch Lift Manual
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Under voltage Test.
Figure 3-12. Control compartment, terminal and control locations
(1)  Turn off key switch. Isolate all power circuits
(-) to terminal B2+.
by placing thin cardboard between all pairs of contacts
(8)  Measure for 4.5 to 5.5 volts from terminal
on all contractors except the EC contactor.
B2+ (- lead) to terminal I (+ lead).
(2)  Remove control compartment cover panel
Note.  If the reading of step 18) is
(TM 10-3930-620-12). Connect battery and turn on key
incorrect, test the diode bias block on
switch.
the power switch assembly (para 3-9).
(3)  Measure for full battery voltage from terminal
(9)  Measure voltage between terminal 3 (--)and
8 (-) to terminals B +, B2+, and C2+.
terminal B2+ as follows:
(4)  Measure for full battery voltage from terminal
(a)  Set directional control switch in forward
2 (-) to terminal B2+.
(F) position.
Note. If incorrect reading is obtained on
(b)  With accelerator pedal up, voltmeter
terminals 2, 4. 6.  or 7, test resistor
should read below zero.
assembly (para 3-8).
Note. If the reading of step (b) or (c) is
(5)  Measure for 0.14 volts from terminal 4 (-) to
incorrect, check the adjustment of the
terminal B2+.
speed potentiometer (para 3-6 f).
(6)  Measure for 13 to 15 volts from terminal 6
(c)  With accelerator pedal fully depressed,
to terminal B2+.
voltmeter should read approximately 4 volts.
(7)  Measure for 9.5 to 10.5 volts from terminal 7
(d)  Voltage reading should vary smoothly
3-22

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