Symptom Troubleshooting Guide; Pmc Control; Plugging Diode; Freewheel Diode - Taylor-Dunn SC-001-59 Operation, T Roubleshooting And Replacement Parts Manual

SYMPTOM TROUBLESHOOTING GUIDE

This section is specific to the symptoms listed below. Each troubleshooting sequence assumes
that all listed symptoms are present. Do not use this section unless the truck has all listed
symptoms.
Ø
Runs slow in both directions plus high armature and field current in both
directions. NOTE: Armature and field current should be equal.
Ø
Runs slow in both directions plus high armature current in both directions.
NOTE: Field current will be very low.
Ø
Runs normal in one direction only plus runs slow or lacks power in the opposite
direction with high armature current in the opposite direction or;
Accelerates slowly and exceeds normal speed in the opposite direction with high
armature current only. NOTE: Field current will be very low in the opposite
Ø
direction.
Ø
Accelerates slowly and exceeds normal speed in both directions plus high
armature current. NOTE: Field current will be very low.
Ø
Full speed only.
Ø
Does not run in either direction plus there is noise from motor (hum or whine)
with high field current and low armature current.
Ø
Excessive spark when connecting battery
Ø
Does not run or runs very slow with low motor current and high battery current.
Ø
Jumps into high speed when direction is selected after depressing the accelerator
pedal.

PMC CONTROL .................................................................... 22

PLUGGING DIODE .............................................................. 25

FREEWHEEL DIODE ........................................................... 26

ISO ........................................................................................... 27

SOLENOIDS .......................................................................... 29

MOTOR .................................................................................. 32

SYMPTOMS
Special Troubleshooting
Table of Contents
Curtis PMC Troubleshooting
FREEWHEEL DIODE
GO TO
MOTOR
SOLENOIDS
SOLENOIDS
SOLENOIDS
PMC CONTROL
PLUGGING DIODE
ISO
HPD
Page 19