2007/11/26 New Pressure Switches Update the Wiring Groups and Lines Groups {1408, 4304} Caterpillar


New Pressure Switches Update the Wiring Groups and Lines Groups {1408, 4304}
`
2007/11/26 [SEPD0916]
ELECTRICAL AND STARTING SYSTEM
BATTERY GP
2007/11/26 New Pressure Switches Update the Wiring Groups and Lines Groups {1408, 4304}
Off-Highway Truck/Tractor:
784B (S/N: 5RK1-UP)
784C (S/N: 2PZ1-UP)
785B (S/N: 6HK1-UP)
785C (S/N: 1HW1-UP; APX1-UP; 5AZ1-UP)
789B (S/N: 7EK1-UP)
789C (S/N: 2BW1-UP)
793B (S/N: 1HL1-UP)
793C (S/N: 4AR1-UP; ATY1-UP; 4GZ1-UP)
793D (S/N: FDB1-UP)
797 (S/N: 5YW1-UP)
797B (S/N: JSM1-UP)

Description of Change: New pressure switches are now used in the wiring groups and lines groups that monitor low steering pressure. The new pressure switches are more rugged than the former switch.

Adaptable To: The new 307-6718 Pressure Switch is a direct replacement for the former 3E-7809 Pressure Switch. The new 307-6719 Pressure Switch is a direct replacement for the former 3E-7812 Pressure Switch. The new 308-8429 Pressure Switch is a direct replacement for the former 3E-6461 Pressure Switch. The new 256-3638 Pressure Switch is a direct replacement for the former 173-2679 Pressure Switch. The new switches are adaptable back to the beginning of production of the machines.

The new pressure switches became effective in production with the following machines: 2PZ107-UP, APX1239-UP, 5AZ426-UP, 2BW1304-UP, FDB567-UP and JSM220-UP

Refer to Table 1 for the new parts and the former parts. Refer to Table 2 for a list of the use of the former part numbers.

Table 1
Former Part Numbers and New Part Numbers    
New Part     Description     Former Part    
307-6718     Pressure Switch     3E-7809    
307-6719     Pressure Switch     3E-7812    
308-8429     Pressure Switch     3E-6461    
256-3638     Pressure Switch     173-2679    

Table 2
Use of the Former Pressure Switches    
Former Part Number     Group     Description    
3E-7809     2A-6529     Battery and Wiring Gp    
    2A-6542     Machine Wiring Gp    
    115-6477     Battery and Wiring Gp    
    115-6478     Machine Wiring Gp    
    124-7689     Chassis Wiring Gp    
    142-4042     Chassis Wiring Gp    
    147-3533     Machine Wiring Gp    
    149-3068     Steering Lines Gp    
    167-7947     Chassis Wiring Gp    
    170-3624     Chassis Wiring Gp    
    174-0748     Machine Wiring Gp    
    193-6247     Chassis Wiring Gp    
    197-4018     Steering Lines Gp    
3E-7812     2A-6513     Chassis Wiring Gp    
    115-6476     Chassis Wiring Gp    
    147-3200     Battery and Wiring Gp    
    152-4634     Battery and Wiring Gp    
    174-0747     Chassis Wiring Gp    
    193-6247     Chassis Wiring Gp    
3E-6461     2A-6529     Battery and Wiring Gp    
    2A-6542     Machine Wiring Gp    
    115-6477     Battery and Wiring Gp    
    115-6478     Machine Wiring Gp    
    124-7689     Chassis Wiring Gp    
    142-4042     Chassis Wiring Gp    
    147-3533     Machine Wiring Gp    
    167-7947     Chassis Wiring Gp    
    170-3624     Chassis Wiring Gp    
173-2679     149-3056     Chassis Wiring Gp    
    220-5601     Chassis Wiring Gp    
The former pressure switches contain ms connectors. The new pressure switches contain DT connectors. On the wiring harness, you must replace the ms connector with a DT connector.

Use the following procedure in order to update your machine to the new DT connectors.

Note: When you replace the ms connectors, disconnect the electrical connector to the pressure switch. Identify the pin that connects to each wire. The wire connections for the wires may not be obvious because the wires are potted. In order to reduce the opportunity for an error, cut one wire at a time. Perform a continuity check on the cut wire and the pin in the ms connector. Insert one wire at a time into the new DT connector.

Table 3
Parts Needed to Update the Pressure Switches.    
Item     Qty     Part Number     Description    
1     2     9X-3402     Connector Sockets (1)    
2     1     155-2260     Connecting Plug Kit    
( 1 ) The connector sockets are also part of the 175-3700 Connector Repair Kit .



    Illustration 1g01430694

    Pinout specification of the former pressure switch

    (4) Pin (C)

    (5) Pin (A)

    (6) Pin (B)




    Illustration 2g01430697

    Pinout specification of the new pressure switch

    (7) Pin (B)

    (8) Pin (A)

    (9) Pin (C)

  1. In the ms connector that is in the wiring harness, identify the wire that connects to pin (A) on the former pressure switch. On the new pressure switch with a DT connector, the wire to pin (A) connects to pin (B) .

    On the ms connector that is in the wiring harness, identify the wire that connects to the socket for pin (B) on the former pressure switch. On the new pressure switch with a DT connector, the wire to pin (6) connects to pin (A). Refer to Table 4.

    Record the color of each wire and the number of each wire. Label each wire.

  1. Disconnect the former pressure switch. Remove the former pressure switch.

  1. Remove the connector for the former pressure switch that is in the harness that is on the machine.

  1. Remove 6 to 8 mm (0.24 to 0.32 inch) of insulation from each wire.

  1. By using the 1U-5804 Crimp Tool, crimp one connector socket (1) onto each wire.

    Table 4
    The Pinout Specification for the new Pressure Switch    
    Wire     Circuit     Color     Status    
    A     Pin (A) (Ground)     BK     Used    
    B     Pin (B) (N/O).     RD     Used    
    C     Pin (C) (N/C).     BU     Unused    

  1. Install each wire into the plug assembly that is part of connecting plug kit (2) .

    Note: The orientation of the three pins on the new DT connector is different from the orientation of the three pins in the ms connector.

  1. Insert the green wedge from the connecting plug kit (2) into the plug assembly. In order to verify that each connector socket (1) is locked into position, pull on the plug assembly with a force of 45 N (10 lb).

  1. Install the new pressure switch into the port as the former pressure switch. Torque the switch to 35 ± 3 N·m (26 ± 2 lb ft).

  1. Plug the connector from the harness into the connector that is part of the pressure switch. Ensure that the tab lock on the connector is secure.

  1. Ensure that the wiring harness that is on the machine is secured no more than 105 mm (4.1 inch) from the pressure switch.

    Note: As the three wires exit the pressure switch, do not place stress on the wires or have less than a 10 mm (0.4 inch) radius on the wires.

Information System:

CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Relief Valve (Main, Drum Propel Pump) - Test and Adjust
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Relief Valve (Charge Pressure, Axle Propel Pump) - Test and Adjust
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Relief Valve (Charge Pressure, Drum Propel Pump) - Test and Adjust
140M and 150 Motor Grader Power Train Gear Pump (Transmission Charging and Scavenge) - Disassemble
2007/10/08 A New Main Power Relay and Starter Relay are Now Used {4493, 7499}
CB34, CB34XW and CC34 Utility Compactors Battery Disconnect Switch - If Equipped
160M and 160 Motor Grader Power Train Transmission Oil Cooler - Install
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Soil Compactors Machine Systems Hydraulic Oil Contamination - Test
CP54B, CS54B and CS64B Vibratory Soil Compactors Propel System Propel System Troubleshooting
CP56, CS56, CP64, CS64, CP74 and CS74 Vibratory Compactors Propel System Hydraulic System Pressure - Release
160M and 160 Motor Grader Power Train Transmission Oil Cooler - Remove
140M and 150 Motor Grader Power Train Differential Lock Valve - Remove and Install
140M and 150 Motor Grader Power Train Gear Pump (Transmission Charging and Scavenge) - Assemble
770 and 772 Off-Highway Trucks Power Train Differential and Bevel Gear - Remove
770 and 772 Off-Highway Trucks Power Train Differential and Bevel Gear - Disassemble
770 and 772 Off-Highway Trucks Power Train Differential and Bevel Gear - Install
140M and 150 Motor Graders Engine Supplement Engine Support (Front) - Remove and Install
2008/01/28 The Lighting Wiring Group is Updated {1408, 1429, 7553}
C32 Engine for D11T Track-Type Tractors Component Location
140M and 150 Motor Grader Piston Pump (Hydraulic Fan) - Disassemble
160M and 160 Motor Grader Power Train Front Axle - Install
140M and 150 Motor Grader Piston Pump (Hydraulic Fan) - Assemble
3500 Generator Sets Air Shutoff - Test - Engines That Are Equipped with ADEM II or ADEM III Engine Control Modules (If equipped)
C32 LRC Engine for Track-Type Tractors Electrical Connectors