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34
E
LECTRICAL
The electrical system is divided into two sections. The first
section describes how the electrical components work and the
second section describes how to adjust and repair the electrical
components.
Wittke offers two different electrical systems. One is controlled
by relay logic and the other one is controlled by an electronic
controller (optional). Both systems are equivalent. The only
difference between both of them is the control box located inside
the cab.
E
S
LECTRICAL
Two types of schematics are provided with Wittke trucks. First,
there is the electrical schematic, which shows how components
are wired to each other. This schematic is useful to diagnose
electrical circuits.
The second one is the control schematic, which shows the truck
logic. This schematic is used to find which components are
involved in a specific circuit. If the truck is equipped with an
electronic controller, this schematic is replaced by a
configuration sheet, which is explained in details in the
Electronic Modules Troubleshooting Guide (part # 90330).
H
E
OW THE
LECTRICAL
The electrical system includes:
•
Control panel
•
Relay box
•
Electronic controller (optional)
•
Valve box
•
Limit/proximity switches
•
Harnesses
Control Panel (located centrally in the cab)
The front loader's push buttons, toggle switches and warning
lamps are located in a centrally mounted control panel in the
cab. Some units have auxiliary controls located on the curb or
street side of the truck.
S
YSTEM
CHEMATICS
S
YSTEM
W
ORKS
Part #: 90309
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