2014/03/25 Caterpillar

An Improved Disconnect Switch Group Is Now Used on Certain Off-Highway Trucks and Wheel Tractor-Scrapers {1411}

Usage:

770 BZZ

Off-Highway Truck: 770 (S/N: BZZ1-UP) 770G (S/N: KDH1-UP; ECM1-UP) 772 (S/N: RLB1-UP; J2M1-UP) 772G (S/N: LTS1-UP; KEX1-UP)
Quarry Truck: 773G (S/N: MWH1-UP; JWS1-UP) 775G (S/N: RFM1-UP; MJS1-UP)
Wheel Tractor-Scraper: 621H (S/N: DBK1-UP; HKK1-UP; NYY1-UP; EAZ1-UP) 623H (S/N: EJD1-UP; DBF1-UP) 627H (S/N: LCT1-UP; DBW1-UP) 637G (S/N: DFJ1-UP; DEY1-UP) 657G (S/N: W1B1-UP; W1C1-UP; W1E1-UP; W1F1-UP)

Description of Change: An improved disconnect switch group is now used on the machines listed above. The new switch has been improved with a brazed joint between the ground spacer and the bus bar providing a more robust grounded connection.

Adaptable To:

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Table 1
Parts List
Quantity	Improved Part	Description	Current Part
1	237-7602 "CHG 05"	237-7602 Disconnect Switch Gp	237-7602 "CHG 04"

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Illustration 1	g03651416

The manufacturing process of 237-7602 Disconnect Switch Gp has been improved by conducting 100 percent in line resistance testing.

The 237-7602 Disconnect Switch Gp improvements have been progressed from change level "04" to "05".

Improved 237-7602 Disconnect Switch Gp is adaptable to machines and effective in production with machines that are listed in Table 1.

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Table 2
Sales Model	Adaptable to Machines	Effective in Production with Machines
621H	S/N:DBK1-128	S/N:DBK129-UP
	S/N:EAZ1-125	S/N:EAZ126-UP
	S/N:HKK1-136	S/N:HKK137-UP
	S/N:NYY1-123	S/N:NYY124-UP
623H	S/N:DBF1-170	S/N:DBF171-UP
623H	S/N:EJD1-105	S/N:EJD106-UP
627H	S/N:DBW1-332	S/N:DBW333-UP
627H	S/N:LCT1-112	S/N:LCT113-UP
637G	S/N:DEY1-237	S/N:DEY238-UP
637G	S/N:DFJ1-522	S/N:DFJ523-UP
657G	S/N:W1B1-168	S/N:W1B169-UP
	S/N:W1C1-323	S/N:W1C324-UP
	S/N:W1E1-236	S/N:W1E237-UP
	S/N:W1F1-143	S/N:W1F144-UP
770	S/N:BZZ1-898	S/N:BZZ899-UP
770G	S/N:ECM1-239	S/N:ECM240-UP
770G	S/N:KDH1-205	S/N:KDH206-UP
772	S/N:RLB1-902	S/N:RLB903-UP
772	S/N:J2M1-101	S/N:J2M102-UP
772G	S/N:KEX1-105	S/N:KEX106-UP
772G	S/N:LTS1-337	S/N:LTS338-UP
773G	S/N:JWS1-245	S/N:JWS246-UP
773G	S/N:MWH1-345	S/N:MWH346-UP
775G	S/N:MJS1-391	S/N:MJS392-UP
775G	S/N:RFM1-632	S/N:RFM633-UP