CUP 2D8496 - Caterpillar

Introduction
For Specifications with illustrations, make reference to Specifications for 3304B & 3306B Industrial & Marine Engine Attachments, SENR2570. If the Specifications in SENR2570 are not the same as in the Systems Operation and the Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.Instrument Panel
Wiring Diagram For Instrument Panel
(1) Light switch. (2) Panel lights. (3) Instrument panel. (4) Ammeter. (5) Oil pressure gauge. (6) Water temperature gauge. (7) Gear oil pressure gauge. (8) Terminal strip. (9) Wire to battery. (10) Oil pressure switch with time delay. (11) Sending unit for oil pressure. (12) Sending unit for water temperature. (13) Sending unit for gear oil pressure.
Gauges With Resistors For 32 Volt System
(1) Resistor. (2) Oil pressure gauge. (3) Resistor. (4) Water temperature gauge. (5) Resistor. (6) Gear oil pressure gauge.
Resistor For 32 Volt System (65Ohms)Indicators And Sending Units
Sending Unit for Water Temperature
Sending Unit For Water Temperature
(1) Connection. (2) Bushing. (3) Bulb.The sending unit for water temperature is an electrical resistance. It changes the value of its resistance according to the temperature which the bulb (3) feels.The sending unit is in a series circuit with the electrical indicator. When the temperature is high, the resistance is high. This makes the indicator have a high reading.The sending unit must be in contact with the coolant. If the coolant level is too low because of a sudden loss of coolant while the engine is running or because the level is too low before starting the engine, the sending unit will not work correctly.Sending Unit for Oil Pressure
Sending Unit For Oil Pressure
(1) Connection. (2) Bushing.The sending unit for oil pressure is an electrical resistance. It has a material which changes electrical resistance according to pressure which it feels.The sending unit for oil pressure is in a series circuit with the electrical indicator. As the pressure on the sending unit changes, the reading on the indicator changes in the same way.Electric Hour Meter
Hour Meter Wiring Diagram
(1) Electrical hour meter. (2) Pressure switch. (3) To alternator or battery.Electric hour meter (1) measures the clock hours that the engine operates. The hour meter activates when pressure switch (2) closes. Pressure switch (2) closes the circuit from the positive terminal on the alternator or battery when the engine oil pressure is above approximately 6 psi (40 kPa).Electric Tachometer Wiring
(1) Magnetic pickup. (2) Terminal connections - terminals 7 and 8 on standby governor control. (3) Tachometer. (4) Ground connection - governor control chassis ground. (5) Governor control terminal strip. (6) Wiring connections - for second tachometer circuit. (7) All wire must be 22AWG shielded cable or larger. (8) Dual speed switch terminal strip. (9) Ground connection - ground to engine.Wiring Diagram
Starting And Charging System
(1) Off, start switch. (2) Ammeter. (3) Fuel shutoff solenoid. (4) Starter solenoid. (5) Alternator regulator. (6) Starter motor. (7) Pressure switch - normally open. (8) Alternator. (9) Battery. (10) Hourmeter. Automatic Start/Stop System
Automatic Start/Stop System Schematic (Hydraulic Governor)
(1)