2008 Ducati 848 Diagnostic instruments

For information on the “DDS” tester, refer to Sect. D 5, DDS tester.

Using a multimeter to check the electrical systems
Introduction
This instrument allows you to measure resistances, voltages, and current values. Multimeters can be divided into two basic types: those with an analogue display and those with a digital display Units of the first type are equipped with a dial and needle. The dial is marked with the scales to be used for measurement of the various parameters. Digital units are equipped with a dial that displays numbers corresponding to the values of the measured parameters. The type of measurement to be carried out (voltage, current or resistance) is set by means of a selector or by means of several different sockets in which to insert the two test probe connector terminals. In certain cases it is essential to set the full scale value before proceeding. For example, in order to measure a 12 V signal, you need to set a full scale that is close to this value (e.g. 15 V or 20 V). It would be illogical to set a full scale value of 10 V; the same applies when setting current (Amps) or resistance (Ohms) full scale values. Sometimes the instrument can set the required full scale value automatically. Never exceed the maximum value allowed by the tester when measuring voltage or current signals.


The DDS tester (Sect. D 5, DDS tester) can perform the functions of a digital multimeter.

Voltage measurement

Voltage measurements must be carried out by connecting the terminals of the tester in parallel to the load (e.g. to the wires feeding a light bulb or a relay, the two battery terminals, or the two wires supplying power to a control unit). Voltages can be constant over time (DC voltage) or variable over time (AC voltage). In the first case, it is important to consider the negative and positive polarity of the application. It is therefore necessary to select on the multimeter the type of voltage you intend to measure. (DC voltage is shown by the symbol = while AC voltage is denoted by ~).

Current measurement

Current measurements must be made by connecting the multimeter terminals in series with the load (e.g. disconnect one of the wires feeding power to a light bulb and connect one terminal of the multimeter to the free end of wire and the other terminal to the light bulb. When the lights switch is set to ON, the bulb will illuminate normally and the tester will show the absorbed current, i.e. the amount of current passing through the wire. Warning: connections in series must be made and removed only when the power is switched off. Never attempt to make or break a series connection when a device is powered. Always make sure that the connection in series of the tester terminals on the electrical device is made is a safe manner in such a way that it cannot be broken accidentally.

Measurement of resistance values and electrical continuity

Resistance measurements must be taken only when the electrical device or section of the circuit is not powered and isolated from the main electrical system (i.e. not connected to the main electrical system). These measurements can be utilised to check the resistance value across several sensors. For example, after disconnecting the electrical wiring to the rpm/ignition - injection system timing sensor (on the camshaft drive gear) the relative internal resistance can be checked by connecting a multimeter to its terminals. This makes it possible to check the electrical continuity of the winding inside the sensor (a reading of infinite resistance indicates that the winding is interrupted). Resistance measurement can also be used to check the continuity of sections of the electrical circuit or relay type switches. For example, to check the condition of a section of the electrical circuit between two connections, disconnect the connections and connect the terminals of the multimeter to the ends of the electrical cable in question to check that the specified resistance value is present. If this value is close to zero (i.e. lower than approximately 0.3 ohm) this means that the cable is not interrupted. Some instruments feature an audible signal that is emitted when the resistance approaches a value of zero. The same procedure must be adopted to check whether, for example, two contacts of a switch (relay or manual type) are making the contact correctly when closed. In this case the terminals of the multimeter must be connected to the switch terminals, checking that the resistance value is close to zero (or listening for the audible signal) when the switch is closed. To check that the multimeter is functioning correctly in “electrical continuity test” mode, short out the two test probes. The resistance value indicated must be almost nil and the audible signal must be activated.

Protections and precautions


The multimeter is equipped with protective fuses and batteries. These components must always be in perfect condition to ensure that the instrument is functioning correctly. When making electrical measurements always use the maximum caution to avoid short circuits, which can otherwise cause irreparable damage to the electrical system and constitute a personal injury hazard. All maintenance work must be performed exclusively when the system is not live (disconnect the battery in advance). NEVER connect the multimeter in parallel to make current measurements, and NEVER connect it in series to carry out voltage measurements.

1999 3000 Series Engineering Updates

HEAT SHIELD 
A heat shield has been installed on all 3000 series tractors for 1999. The heat shield prevents the exhaust gases from browning the grass. Use kit #7593927. See Service Advisory CC-371.

1. Remove both of the hex bolts and lock nuts securing the front bumper to the frame using a 3/4" socket and a 3/4" wrench. 

2. Remove the bumper. 

3. Slide the muffler shield over the exhaust pipe and rotate it into position

NOTE: Align all three holes in the top of the muffler shield with the existing shield. Also, the muffler shield will be slanting towards the bottom of the front grill assembly

4. Secure the muffler shield with three sheet metal screws.

NOTE: Use a long flat blade screwdriver through the air holes in the grill to tighten the sheet metal screws securely.

5. Install the bumper.

LIFT LINK
The lift link has been modified by strengthening the powder metal that connects the lift lever to the hydraulic valve for 1999.
CHECK VALVE
For 1999, a check valve will be installed to the hydraulic valve to prevent the decks and other attachments from leaking down during and after usage.
LIFT STOP BRACKET
A lift stop bracket will be installed on the left hand side of the deck to prevent the deck from hanging up during operations. Use kit #759-3927.
ROLLER HEIGHT ADJUSTER
The rear roller height adjustment mechanism will be changed for 1999. A newly designed detent pin will
replace the old one, preventing the loss of cutting height during operations. Use kit #759-3928.
FRONT DECK HANGER ASSEMBLY
The front roller bracket has been redesigned to prevent the front lift rod from detaching during operation.
SEAT IMPROVEMENTS
A safer seat spring, part number 732-0869, can be
installed to level the seat for petite operators. In addition, the seat part number 757-3010A, is now made out of a softer material for better operator comfort.

FRONT MOWER DECK HEIGHT ADJUSTER

The front mower deck height adjuster pins have been changed from ball detent pins to quick pull pins.

STEERING WHEEL
The thickness of the steering wheel has been increased for operator comfort

Old Style Steering Wheel

New Thicker Steering Wheel

ROCK SHAFT ASSEMBLY FOR 3 POINT HITCH
190-365-100
The cylinder arms have been redesigned with two V sections cut out to allow for clearance of the clevis nut
on the cylinder shaft. See Service Advisory CC-364

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Horn 
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Restraints 
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Engine 
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Suspension 
Driveline 
Brakes 
Cooling 
Audio/Video 
Chime/Buzzer 
Clock 
Electronic Control Modules 
Engine Systems 
Heated Systems 
Horn 
Ignition Control 
Instrument Cluster 
Lamps 
Message Systems 
Power Systems 
Restraints 
Speed Control 
Vehicle Theft Security 
Wipers/Washers 
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Section 3 – Fuel System
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Section 5 – Tracks / Steering
Section 6 – Power train
Section 7 – Brakes
Section 8 – Hydraulics
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Fuel Tank 
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Main And Engine Electronic Control Boxes 
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Rollers 
Sprocket 
Idler Wheel And Tension Shock Absorber 
6 Drive Train 
Drive Motor And Final Drive Transmission Removal And Installation 
Swing Reduction Gear, Removal And Installation 
Swing Reduction Gear, Disassembly And Assembly 
Travel Reduction Gear Disassembly And Assembly 
7 Undercarriage Hydraulics 
8 Upperstructure Hydraulics 
Depressurising And Decontaminating The Hydraulic System, Use Of The Vacuum Pump And Bleeding The Components 
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Attachment Cylinders, Removal And Installation 
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Pilot Blocs, Removal And Installation 
Swing Motor, Removal And Installation 
Main Hydraulic Pump, Disassembly And Assembly 
Main Hydraulic Control Valve, Disassembly And Assembly 
Attachment Cylinders, Disassembly And Assembly 
Hand Control Levers, Disassembly And Assembly 
Foot Control Levers, Disassembly And Assembly 
Six-Solenoid Valves, Disassembly And Assembly 
Caution Valve, Disassembly And Assembly 
Hydraulic Swivel, Disassembly And Assembly 
Swing Motor, Disassembly And Assembly 
Hydraulic Functions 
Travel Hydraulic Motor, Disassembly And Assembly 
Hydraulic Component Functions 
9 Upperstructure 
Upperstructure, Turntable And Counterweight 
Boom, Dipper And Bucket 
Seat And Seat Belt 
Cab And Cab Equipment 
Air Conditioning Troubleshooting 
Air Conditioning Unit Disassembly And Assembly 
Air Conditioning Servicing 
Air Conditioning Components 
Large Format Hydraulic Schematic 
Large Format Electrical Schematic
 
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