2013/09/12 Caterpillar

A New Harness Assembly is Available for Certain 777G Off-Highway Trucks {1408, 7540}

Usage:

777G RDR

Off-Highway Truck/Tractor: 777G (S/N: T5A1-UP; TNM1-UP; RDR1-UP; T4Y1-UP)

The new harness assembly allows the autolube pump level sensor to communicate with the chassis ECM (Electronic Control Module). The new harness allows the "Low Autolube Grease Level" message to appear on the Advisor display screen in the cab.

The new 437-5500 Sensor Harness As can be installed on any 777G Off-Highway Truck that is equipped with the 360-2633 Service Center Ar, or the 373-4027 Service Center Ar .

The new 437-5500 Sensor Harness As is available through the parts department at you local Cat^® dealer. Use the following information to fabricate, and install the harness assembly.

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Table 1
Required Parts
Item	Qty	Part Number	Description
1	1	155-2271	Connecting Plug Kit
	1	155-2272 ⁽¹⁾	Connector Plug As
	1	155-2262 ⁽¹⁾	Plug Lock Wedge
2	2	102-8804	Receptacle Kit
	1	3E-3376 ⁽²⁾	Connector Receptacle As
	1	3E-3377 ⁽²⁾	Receptacle Lock Wedge
3	4	9X-3402	Connector Sockets
4	4	9X-3401	Connector Pins
5	4	8T-8737	Seal Plugs
6	1	322-5650 ⁽³⁾	Electrical Wire
7	6	3S-2093	Cable Straps
8	6	7K-1181	Cable Straps

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^( 1 )	Part of the 155-2271 Connecting Plug Kit
^( 2 )	Part of the 102-8804 Receptacle Kit
^( 3 )	Total length of bulk wire required is 1970 mm (77.6 inch)

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Illustration 1	g03424795
(9) Connects to the harness connector tag "Autolube Level Switch" (10) Connects to the harness connector tag "Mates to Autolube LVL SW" (11) Connects to Autolube Pump Level Sensor (A) Two wires 302 mm (11.9 inch) (B) Four wires 200 mm (7.9 inch) (C) Two wires 283 mm (11.1 inch)

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Table 2
Connector (9) a 102-8804 Receptacle Kit (2)
Color-Gauge	Position	Term/Plug
	1	8T-8737 (5)
	2	8T-8737 (5)
Black-16	3	9X-3401 (4)
Black-16	4	9X-3401 (4)

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Table 3
Connector (10) a 102-8804 Receptacle Kit (2)
Color-Gauge	Position	Term/Plug
Black-16	1	9X-3401 (4)
Black-16	2	9X-3401 (4)
	3	8T-8737 (5)
	4	8T-8737 (5)

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Table 4
Connector (11) a 155-2271 Connecting Plug Kit (1)
Color-Gauge	Position	Term/Plug
Black-16	1	9X-3402 (3)
Black-16	2	9X-3402 (3)
Black-16	3	9X-3402 (3)
Black-16	4	9X-3402 (3)

Cut four wires for the harness assembly. Cut two wires to a length of 502 mm (19.8 inch). Cut two wires to a length of 483 mm (19.0 inch). Use the parts listed in Table 1 to fabricate the harness assembly. Refer to all four tables and the Illustration 1. Use six cable straps (7) to bundle the wires together between the connectors.

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Illustration 2	g03424809

Disconnect the 360-2947 Wiring Harness connection (13) that is labeled "Autolube Level Switch" for the autolube pump level sensor. The end of the 360-2947 Wiring Harness will be disconnected until later in the procedure. Install harness assembly connector (11) to the connector for the autolube pump level sensor that is on the pump unit.

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Illustration 3	g03424814

Remove receptacle assembly (14) that covers the connection on the 314-9556 Chassis Harness As connector that is labeled "Mates to Autolube LVL SW". Discard the receptacle assembly. Install harness assembly connector (10) to the 314-9556 Chassis Harness As connector that is labeled "Mates to Autolube LVL SW".

Install harness assembly connector (9) to the disconnected end of the 360-2947 Wiring Harness connector that is labeled "Autolube Level Switch". This connector was disconnected in Step 2. Refer to Step 2, and Illustration 2.