Service Manual

Troubleshooting
CAUTION
Remove all especially rings and
watches, before doing any electrical trouble-
ness from the vehicle unless the test requires
battery voltage.
jewelry,
shooting or testing. Disconnect the power har-
For effective troubleshooting and repairs, you must
have a good understanding of the electrical circuits (see
Chapter 6 – Electrical Diagrams) and components used
on this machine.
If the machine has the interlock switch by–passed, it
must be reconnected for proper troubleshooting and
safety
.
Problem Possible Causes
Brush rotates (but should not) when dump hopper is
raised.
Hopper down proximity switch is malfunctioning or
faulty
.
Brush relay is faulty.
Hopper switch or circuit wiring is faulty.
Logic diode is faulty.
Brush does not rotate. Hopper is raised (brush should only rotate when
hopper is fully lowered).
Hopper down proximity switch is malfunctioning or
faulty
.
Problem with power or ground from vehicle (other
sweeper functions af
fected as well).
Fuse (20 Amp) is faulty (other sweeper functions
af
fected as well).
Brush switch or circuit wiring is faulty.
Brush relay or circuit wiring is faulty.
Hopper down relay or circuit wiring is faulty.
Logic diode is faulty.
Demand solenoid valve coil (S2) or circuit wiring is
faulty
.
Brush solenoid valve coil (S3) or circuit wiring is faulty.
Hydraulic problem exists (see Chapter 3 – Hydraulic
System).
Electrical System
Page 4 – 2
Pro Sweep 5200