COVER 2476273 - Caterpillar

Rotary Position Sensor (Boom)
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Rotary Position Sensor (Boom)
Position Sensing Cylinder (PSC)
The Position Sensing Cylinder (PSC) measures the rod extension and retraction of the hydraulic cylinder for the bucket. The PSC uses a sensor that is integrated into the cylinder to make this measurement. Refer to Special Instruction, M0064526, "Troubleshooting Procedure For Bucket Cylinder Position Sensing Unit on Certain Hydraulic Excavators Equipped With Cat® Grade Control".
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(5) Position sensing cylinder connector
(6) Position sensing cylinder assembly
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Bucket Position Sensing Cylinder Connector
(7) Ground
(8) Supply voltage
(9) Signal
Table 3
Bucket Position Sensing Cylinder Connector
Pin Description Color
1 Supply Voltage +8VDC OR(Orange)
2 Ground BK(Black)
3 Signal WH(White)
4 N/A LC450 Laser Catcher
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LC450 Laser Catcher
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Laser Catcher Six-Pin Connector
Table 4
Laser Catcher Connector
Pin Function
A Power
B Unused
C CAN HI
D CAN LO
E Unused
F Ground ECM
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Machine ECM
(10) ECM
(11) J2 Connector (Brown)
(12) J1 Connector (Black)
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Connectors for the Machine ECM
(13) J2 Connector (Brown)
(14) J1 Connector (Black)Table 5 and Table 6 lists the contact description for the ECM.
Table 5
J1 Connector
J1 - 16 "CDL-"
J1 - 25 "CDL+"
J1 - 45 "CAN3+"
J1 - 46 "CAN3-"
J1 - 47 "CAN2+"
J1 - 48 "CAN2-"
J1 - 50 "CAN1+"
J1 - 51 "CAN1-"
Table 6
J2 Connector
J2 - 1 "BAT +"
J2 - 2 "GND"
J2 - 13 "BAT +"
J2 - 14 "GND"
J2 - 23 "Key"
J2 - 27 "8V Power for PSC"
J2 - 44 Bucket PSC
J2 - 47 "Stick potentiometer"
J2 - 50 "Boom potentiometer"