345B, 345B Series II and W345B Series II Excavators Engine and Pump Control General Information (Electrical System) Caterpillar


General Information (Electrical System)
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345B, 345B Series II and W345B Series II Excavators Engine and Pump Control [SENR1935]
ELECTRICAL AND STARTING SYSTEM
ALTERNATOR GP-CHARGING
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control General Information (Electrical System)
345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Start and Stop Circuit

Note: The following schematics are typical examples. Refer to the Electrical System Schematic for the machine that is being serviced for the most updated information.




Illustration 1g00672319

Starting And Charging System Schematic For 345B

(1) Disconnect switch

(2) Batteries

(3) Power circuit

(4) Main breaker

(5) Main relay

(6) Fuse box

(7) Low current circuit

(8) Radio

(9) Cigar lighter

(10) Engine ECM

(11) Starter switch

(12) Neutral start switch

(13) Cab heater

(14) Air conditioner

(15) Lights

(16) Windshield wiper

(17) Windshield washer

(18) Start/stop circuit

(19) Starter motor

(20) Starter relay

(21) Alternator

(22) Horn

(23) Engine and pump controller

(24) Switch panel

(25) Engine coolant temperature switch

(26) Start aid solenoid

(27) Start aid switch

(28) Charging circuit

(29) Timer relay

(30) Neutral start relay

(31) Main circuit breaker




Illustration 2g00672595

Schematic Of The Starting And Charging System For The 345B Series II

(1) Disconnect switch

(2) Batteries

(3) Power circuit

(4) Main breaker

(5) Main relay

(6) Fuse box

(7) Low current circuit

(8) Radio

(9) Cigar lighter

(10) Engine ECM

(11) Starter switch

(12) Neutral start switch

(13) Cab heater

(14) Air conditioner

(15) Lights

(16) Windshield wiper

(17) Windshield washer

(18) Start/stop circuit

(19) Starter motor

(20) Starter relay

(21) Alternator

(22) Horn

(23) Engine and pump controller

(24) Switch panel

(25) Engine coolant temperature switch

(26) Start aid solenoid

(27) Start aid switch

(28) Charging circuit

(29) Timer relay

(30) Neutral start relay

(31) Alternator circuit breaker

(39) Air conditioner relay

The starting system and the charging system consist of the following circuits:

  • "Power Circuit"

  • "Start and Stop Circuit"

  • "Starting Aid Circuit"

  • "Charging Circuit"

  • "Low Current Circuit"

Note: The electrical circuits can only be activated when the disconnect switch is in the ON (1) position.

Power Circuit

The power circuit supplies power to the electrical components of the machine. The components of the power circuit include the following items:

  • Battery (2)

  • Disconnect switch (1)

  • Alternator circuit breaker (4)

  • Main breaker (31)

  • Main relay (5)

Start/Stop Circuit

The start/stop circuit consists of the following components:

  • Starter motor (19)

  • Starter relay (20)

  • Timer relay (29)

  • Starter switch (11)

  • Engine ECM (10)

  • Neutral start relay (30)

  • Neutral start switch (12)

Starting Aid Circuit

Some machines are equipped with starting aid for cold weather starting purposes. The starting aid circuit consists of the following components:

  • Starting aid switch (27)

  • Start aid solenoid (26)

  • Engine coolant temperature switch (25)

Charging Circuit

The charging circuit uses an alternator (21) to charge the batteries (2). This circuit supplies power to the machine through a fuse panel (6) .

Low Current Circuit

The low current circuit distributes power to several low current components. A switch panel (24) energizes lights (15). Lights are installed in the chassis, on the cab and on the boom. The circuit supplies power to the following components:

  • Radio (8)

  • Cigar lighter (9)

  • Cab heater (14)

  • Air conditioner (14)

  • Windshield washer (17)

  • Horn (22)

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