CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Propel System Components Caterpillar


Propel System Components
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Illustration 1g01415837
Right Side of Operator Platform
(1) Fuse panel
(2) Relay bank

The main electrical panel is located on the right side of the operator station. A cover plate (removed in photo) provides access to these components.

A decal on the inside of the cover plate identifies each fuse in fuse bank (1) and each relay in relay bank (2).



Illustration 2g01415838
Fuses and Relays
(3) Reverse alarm fuse
(4) Gauge fuse
(5) Park brake fuse
(6) Parking brake relay "P1"
(7) Parking brake relay "P2"
(8) Neutral start relay "P4"

When the main power relay is energized, power is available at contact "C5" of the "REV ALARM" fuse. The "REV ALARM" fuse delivers power to contact "1" of the backup alarm.

When the main power relay is energized, power is available at contact "C9" of the "GAUGE" fuse. Power transfers from the "GAUGE" fuse to terminal "1" of the indicator cluster.

When the main power relay is energized, power is available at contact "B9" of the "PARK BRAKE" fuse. The "PARK BRAKE" fuse delivers power to the following places:

  • Contact "1" and contact "3" of the parking brake switch

  • Contact "2" of the shift switch

  • Contact "30" of neutral start relay "P4"

The coil of brake relay "P1" is energized when the parking brake switch is in the ON position. The coil of brake relay "P1" will remain energized when the parking brake switch is moved to the OFF position under the following conditions:

  • The engine start switch is in the ON position or in the START position.

  • The neutral start switch is open.

  • The coil of neutral start relay "P4" is de-energized.

Contact "30" of brake relay "P1" receives power from contact "2" of the parking brake switch when the switch is in the OFF position. When the relay is de-energized, power transfers from contact "87A" to the axle interlock solenoid and to the drum interlock solenoid.

The coil of brake relay "P2" is energized when the parking brake switch is in the ON position. The coil of brake relay "P2" will remain energized when the parking brake switch is moved to the OFF position under the following conditions:

  • The engine start switch is in the ON position or in the START position.

  • The neutral start switch is open.

  • The coil of neutral start relay "P4" is de-energized.

Contact "30" of brake relay "P2" receives power from contact "87A" of neutral start relay "P4." When the relay is energized, power transfers from contact "87" to the following places:

  • Coil of brake relay "P1"

  • Coil of brake relay "P2"

  • Contact "4" of the parking brake switch

  • Contact "X1" of the parking brake indicator

  • Brake lights

The coil of neutral start relay "P4" is energized when the neutral start switch is closed and the engine start switch is in the ON position or in the START position. Contact "30" of the relay receives power from the "PARK BRAKE" fuse. When the coil of neutral start relay "P4" is energized, power transfers from contact "87A" of the relay to contact "30" of brake relay "P2".

Information System:

CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Operator Controls (Propel System)
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