2000/07/10 Caterpillar

A New Receptacle Provides a Reliable Connection {1408, 1431, 5258, 7301}

Usage:

426C 1CR

Backhoe Loader: 416C (PIN: 4ZN1-UP; 5YN1-UP; 1WR1-UP; 1XR1-UP) 426C (PIN: 1CR1-UP; 1ER1-UP; 1MR1-UP; 1NR1-UP; 1YR1-UP; 1ZR1-UP; 6XN1-UP; 7WN1-UP) 428C (PIN: 8RN1-UP; 2CR1-UP) 436C (PIN: 1FR1-UP; 1GR1-UP; 1PR1-UP; 1RR1-UP; 2AR1-UP; 2BR1-UP; 8TN1-UP; 9JN1-UP) 438C (PIN: 9KN1-UP; 1JR1-UP; 1TR1-UP; 2DR1-UP)

Description of Change: A new receptacle has been introduced for the beacon and other electrical devices. The new receptacle provides a locking feature for a better connection. The new receptacle is compatible with standard mobile electronic adapters. The receptacle can be serviced without removing the roof.

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Illustration 1	g00711839
(1) 178-7539 Receptacle As

Adaptable To: The 178-7539 Receptacle As replaces the 9R-7941 Power Receptacle As. See Table 3 for the effectivity of this change. This change is adaptable back to first production. See "Installation Procedure for the Receptacle".

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Table 1
Changes to the Receptacle
New Part Number	Description	Former Part Number
178-7539	Receptacle As	9R-7941
179-5434	Plug	9R-7942

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Table 2
Beacon Lights
Part Number	Description	Type of Mount	Former Part Number
180-3664	Warning Beacon	Magnetic	128-6985
180-3663	Warning Beacon	Fixed Mount	130-7580

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Table 3
Manufacturing Effectivity for the Socket
Model	Product Identification Number
416C	4ZN21216
	5YN16675
	1WR10010
	1XR2251
426C	6XN4611
	1CR1082
	1YR2055
	1WR1418
	1ZR1009
428C	8RN5107
428C	2CR20397
436C	8TN1253
	1FR1418
	2AR1860
438C	1TR1931
438C	2DR3541

Installation Procedure for the Socket

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Table 4
Required Parts
Item	Qty	Part Number	Description
1	1	178-7539	Receptacle As ⁽¹⁾
2	1	179-5434	Plug
3	1	179-5435	Flange
4	2	3E-6922	Recess Flat Head Screw

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^( 1 )

If necessary, install new 6V-0491 Blade Terminals .

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Illustration 2	g00711845
The former socket pulled from the roof.

Use a 28.6 mm (1.125 inch) hole saw to drill around the former receptacle.

Remove the former receptacle from the roof and from the electrical connector.
Note: If necessary, install new 6V-0491 Blade Terminals .

Remove the retaining nut from the 178-7539 Receptacle As. Connect the two wires to the 178-7539 Receptacle As .

Wrap the connections with 1P-0810 Electrical Tape .

Push the receptacle into the roof. Install the 179-5435 Flange with the 3E-6922 Recess Flat Head Screws .
Note: Any former warning beacon lamps can be adapted in order to connect to the receptacle.