CONTACTOR COIL, CHECK
Disconnect coil wires. Test contactor coil using an ohmme-
ter to measure the resistance. The coil should read 23 ohms
±10%. Remove and replace contactor if resistance readings
indicate a short circuit in both directions or if there is an
open circuit in both directions. Make sure coil wires are
connected to the proper terminals. See Figure 7.
NOTE: The contactor contains no serviceable parts and
must be replaced as a complete assembly.
Figure 7. Contactor
Fuses
WARNING
The capacitor in the transistor controller can hold
an electrical charge after the battery is disconnec-
ted. To prevent electrical shock and personal in-
jury, discharge the capacitor before inspecting or
repairing any component in the drive unit com-
partment. Wear safety glasses. Make certain the
battery has been disconnected.
The motorized hand trucks use a single 4-amp in-line fuse
(FU 5) for the control circuit, and a single 400-amp (FU 1)
fuse mounted on the controller for both the drive motor and
the hydraulic pump motor. Trucks with power assisted
steering have a 30-amp in-line fuse in the steering motor
circuit. Remove and replace as required.
If it cannot be determined visually that a fuse has failed,
check for continuity using an ohmmeter. Make certain that
any replacement fuse is of the right amperage before instal-
lation.
2200 SRM 1640 Fuses
9
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