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Electrical Maintenance
8-12
The cylinder head cover must be removed to access the glow plugs.
A shorted glow plug will show excessive current draw (more than 13 amps) during preheat, and may cause fuse F5 (40 A) to
blow. Check each glow plug individually.
EVAPORATOR FAN MOTORS (T-500R/T-DAIRY ONLY)
NOTE: Non-repairable fan motor assemblies are used. If a motor malfunctions, it must be replaced.
CAUTION: Take precautions to ensure the unit will not accidentally start while servicing the system.
The evaporator fan motors are maintenance free. If erratic or intermittent operation is observed, the current draw of the motor
should be measured while proper voltage is applied. The current draw for a evaporator motor is approximately 7.0 to 7.6
amps at 12.5 volts.
If any of the evaporator fan motors do not run at all, check fuses F1, F2, and F3 on the evaporator fan relay board and the output
to the evaporator fans when they should be energized.
UNIT WIRING
Inspect the unit wiring and the wire harnesses during scheduled maintenance inspections for loose, chafed or broken wires to
protect against unit malfunctions due to open or short circuits.
AC COMPONENTS (MODEL 50 UNITS ONLY)
Electrical Contactors
Test the contact points by checking the voltage drop across each set of points when the contactor is energized and the system
is operating. If the voltage drop across a set of points is more than 0.25 Vac, replace the contactor.
Test the contactor coil as follows:
1. Check the voltage to the coil. It should be at battery (source) voltage. If not, check for an open circuit.
2. Check the voltage after the coil. It should be 0 volts. If not, check for an open or high resistance in the circuit to ground. If
the voltage is 0 but the contactor does not pull-in, the coil is probably open. Ohm check to verify.
1.
Remove Wires
2.
Ohmmeter
3.
2.3 Ohms
Glow Plug Ohm Test
CAUTION: Model 50 units use high voltage ac for electric standby operation. Lethal voltage
potentials can exist on connections in the high voltage box. Take appropriate precautions and use
extreme care when testing the unit.
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Summary of Contents for T-1000R
Page 14: ...Safety Precautions 2 6 Warning Decals 2e24151g0 ...
Page 34: ...Maintenance Inspection Schedule 4 10 ...
Page 57: ...Unit Description 5 23 Purge Mode UT Series 1 3 4 5 2 ...
Page 67: ...Unit Description 5 33 Zone 1 Cool and Zone 2 Cool UT SPECTRUM Units ...
Page 69: ...Unit Description 5 35 Purge Mode UT SPECTRUM Units ...
Page 71: ...Unit Description 5 37 Zone 1 Cool and Zone 2 Heat UT SPECTRUM Units ...
Page 72: ...Unit Description 5 38 ...
Page 74: ...Diesel Electric Menu 6 28 Adjust Brightness 6 29 Time 6 30 ...
Page 120: ...Operating Instructions Standard HMI 7 18 ...
Page 152: ...Engine Maintenance 9 14 T Series Fuel and Oil System Components TK 376 ...
Page 154: ...Engine Maintenance 9 16 T Series Fuel and Oil System Components TK 270 ...
Page 156: ...Engine Maintenance 9 18 UT Series Fuel System Components AMA768 ...
Page 172: ...Engine Maintenance 9 34 T Series Engine Mounting Components for 2 Cylinder Engine ...
Page 184: ...Engine Maintenance 9 46 ...
Page 238: ...Refrigeration Maintenance 10 54 ...
Page 246: ...Clutch Maintenance 11 8 ...
Page 258: ...Structural Maintenance 12 12 ...
Page 264: ...Mechanical Diagnosis 13 6 ...
Page 265: ...14 Electric Standby Diagnosis ...
Page 268: ...Electric Standby Diagnosis 14 4 ...
Page 269: ...15 Refrigeration System Diagnosis ...
Page 272: ...Refrigeration System Diagnosis 15 4 ...
Page 280: ...Remote Evaporators 16 8 ...