CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Propel System Propel Electrical System Caterpillar


Propel Electrical System
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CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Propel System [KENR3605]
ELECTRICAL AND STARTING SYSTEM
WIRING GP
CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Propel System Propel Electrical System
1.1. Switch (Neutral Start)
2.1. Switch (Brake)
3.1. Switch (Propel Range)
4.1. Relays
5.1. Solenoid (Brake)
6.1. Solenoid (Axle Interlock Valve)
7.1. Solenoid (Drum Interlock Valve)
8.1. Solenoid (Shift Valve)

Switch (Neutral Start)




Illustration 1g00931241

The neutral start switch energizes the neutral start relays.

The switch is a two-position plunger switch.

When the control valve spool is centered properly, the contacts of the neutral start switch will be closed. When the key start switch is on, the circuit will energize the neutral start relays. When the control valve spool is moved from the centered position (neutral), the contacts of the neutral start switch will open. The neutral start relays will not be energized. This will prevent the machine from starting.

Switch (Brake)




Illustration 2g00931255

The brake switch disables the following solenoids: brake, axle interlock valve and drum interlock valve.

The switch is a two-position push-pull switch.

When the switch is engaged, the switch completes the circuit which energizes the brake relays.

When the switch is disengaged, the switch enables the circuit for the interlock solenoids. If the neutral switch is actuated, the solenoids will energize. This will enable the propel system.

Switch (Propel Range)




Illustration 3g00931256

The propel range switch enables the low speed and the high speed for the propel system.

The switch is a two-position rocker switch. The switch completes the circuit to the solenoid for the shift valve.

The switch may also enable the circuit for the vibratory system.

Relays




Illustration 4g00931277

The following relays are used in the propel system: brake relays and neutral start relays.

The relays have a normally open contact and a normally closed contact. The coil of the relay has a resistance of approximately 380 ohms.

Solenoid (Brake)




Illustration 5g00931049

The brake valve engages the axle brakes and the drum brake when the parking brake is applied.

The solenoid is energized with battery voltage in order to move the valve spool. The solenoid has a resistance of approximately 32Ohms.

When the brake valve is in the BRAKE ON position, the brake solenoid is not energized. In this position, the brake valve shifts and the brake lines are open to the hydraulic oil tank. When the brake lines are open to the hydraulic tank, the spring applied brakes are engaged.

When the axle interlock valve is in the BRAKE OFF position, the solenoid is energized. In this position, the axle interlock valve shifts and the charge oil flows across the valve through the brake lines. The charge oil pressure overcomes the force of the springs and the brakes are released.

Solenoid (Axle Interlock Valve)




Illustration 6g00931245

The axle interlock valve prevents the pump swashplate from moving out of neutral when the parking brake is applied.

The solenoid is energized with battery voltage in order to move the valve spool. The solenoid has a resistance of approximately 24.6Ohms.

When the axle interlock valve is in the BRAKE ON position, the solenoid is not energized. In this position, the axle interlock valve shifts and the brake lines and the directional control valve are open to the hydraulic oil tank. When the brake lines are open to the hydraulic tank, the spring applied brakes are engaged. When the directional control valve is open to the hydraulic tank, the servo valve shifts to the neutral position. This causes the swashplate to move to the neutral position.

When the axle interlock valve is in the BRAKE OFF position, the solenoid is energized. In this position, the axle interlock valve shifts and the charge oil flows across the valve and to the brake lines and the directional control valve. The charge oil pressure overcomes the force of the springs and the brakes are released. When the charge oil becomes available for the directional control valve, any movement of the propel control lever causes the servo valve to shift the swashplate.

Solenoid (Drum Interlock Valve)




Illustration 7g00931245

The drum interlock valve prevents the pump swashplate from moving out of neutral when the parking brake is applied.

The solenoid is energized with battery voltage in order to move the valve spool. The solenoid has a resistance of approximately 24.6Ohms.

When the drum interlock valve is in the BRAKE ON position, the solenoid is not energized. In this position, the drum interlock valve shifts and the brake lines and the directional control valve are open to the hydraulic oil tank. When the brake lines are open to the hydraulic tank, the spring applied brakes are engaged. When the directional control valve is open to the hydraulic tank, the servo valve shifts to the neutral position. This causes the swashplate to move to the neutral position.

When the drum interlock valve is in the BRAKE OFF position, the solenoid is energized. In this position, the drum interlock valve shifts and the charge oil flows across the valve and to the brake lines and the directional control valve. The charge oil pressure overcomes the force of the springs and the brakes are released. When the charge oil becomes available for the directional control valve, any movement of the propel control lever causes the servo valve to shift the swashplate.

Solenoid (Shift Valve)




Illustration 8g00931049

The solenoid for the shift valve controls the low speed and the high speed for the propel system.

The solenoid is energized with battery voltage in order to move the valve spool. The solenoid has a resistance of approximately 32Ohms.

The shift valve controls the operation of the speed shift mechanism in the drum propel motor and the axle propel motor. When the propel speed range control is in the LOW SPEED position, the speed shift solenoid is not energized. The propel motors are at the maximum displacement position (LOW SPEED).

When the propel speed range control is in the HIGH SPEED position, the speed shift solenoid is energized. The propel motors are now at the minimum displacement position (HIGH SPEED).

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