2012/08/08 Caterpillar

Load Haul Dump:

R1300G (S/N: LJB1454-UP)

A new air conditioner relay is now available. The new air conditioner relay will extend the life of the air conditioner compressor clutch.

The new air conditioner relay is adaptable to the machines listed above.

Refer to the following procedure in order to determine if a new air conditioner relay is required.

Procedure to Check the Voltage Supply at 3E-1906 Refrigerant Compressor Gp

1. Park the machine in a smooth level area.

2. Engage the parking brake and stop the engine.

3. Turn the key start switch to the ON position.

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Illustration 1	g03145676
(1) 361-8530 Air Conditioner Gp (2) 186-8221 Knob-Fan Switch (3) 186-8220 Knob-Thermostat

4. Turn 186-8221 Knob-Fan Switch (2) to the ON position.

5. Turn 186-8220 Knob-Thermostat (3) clockwise to the MAXIMUM position.

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Illustration 2	g03145677
Typical compressor mounting arrangement (4) 3E-1906 Refrigerant Compressor Gp

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Illustration 3	g03145678
Electrical schematic for 3E-1906 Refrigerant Compressor Gp

6. Check the voltage supply between pin 2 (wire 513-OR) and pin 3 (wire 200-BK) of the connector.

7. If the voltage supply is less than 24V, check the wiring at 3E-1906 Refrigerant Compressor Gp (4). Refer to System Operation, Testing and Adjusting, "Wiring Harness (Open Circuit) - Test" and System Operation, Testing and Adjusting, "Wiring Harness (Short Circuit) - Test".

8. Check that pin 3 (wire 200-BK) of the connector to ground has a resistance of less than 2 ohms.

9. If the voltage supply between pin 2 (wire 513-OR) and pin 3 (wire 200-BK) of the connector remains at less than 24V, replace the relay in 361-8530 Air Conditioner Gp (1). Refer to "Procedure to Install 231-3930 Relay As ".

Procedure to Install 231-3930 Relay As

1. Turn the key start switch and battery disconnect switch to the OFF position.

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Illustration 4	g03145683
(5) 214-2088 Panel

2. Remove 214-2088 Panel (5) .

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Illustration 5	g03145685
(6) 186-8222 Fan

3. Move 186-8222 Fan (6) to allow access to the inside of 361-8530 Air Conditioner Gp (1) .

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Illustration 6	g03148080
View of the inside of 361-8530 Air Conditioner Gp (1) (7) 163-5833 Relay (8) Existing plug

4. Remove and discard 163-5833 Relay (7), existing plug (8) and existing wire terminals.

5. Install 9X-1056 Receptacle Terminal on each wire.

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Illustration 7	g03148136
Wiring arrangement for 9X-1054 Connector Plug As (9) 9X-1054 Connector Plug As (10) Pink wires (two) (11) White wire (12) Black wire (13) Green wires (two)

6. Install six wires onto 9X-1054 Connector Plug As (9) as shown in Illustration 7.

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Illustration 8	g03148082
Location of 231-3930 Relay As (9) 231-3930 Relay As (14) 227-5169 Case (15) 8T-4138 Bolt (16) 9X-1054 Connector Plug As

7. Install 9X-1054 Connector Plug As (16) onto 231-3930 Relay As (9) .

8. Drill a 6 mm (0.24 inch) hole through 227-5169 Case (14) to mount 8T-4138 Bolt (15). Refer to Illustration 8.

9. Install 231-3930 Relay As (9) onto 8T-4138 Bolt (15) and secure using 5N-6646 Spacer, two 9X-2026 Washers and 5C-2890 Nut .

10. Install 186-8222 Fan (6) .

11. Install 214-2088 Panel (5) .