2012/10/23 Caterpillar

New Permanent Coupling Assemblies Are Now Used for the Service Brake Group on 773G and 775G Quarry Trucks {4251}

Usage:

773G JWS

Quarry Truck: 773G (S/N: MWH1-UP; JWS1-UP; T5S1-UP; T5T1-UP) 775G (S/N: T5F1-UP; RFM1-UP; MJS1-UP; T5W1-UP)

Description of Change: The hose assemblies that attach to the bottom of the rear brake slack adjusters and the hose assembly from the tow valve or park brake valve to the rear wheels have been updated with new permanent coupling assemblies. The new permanent coupling assemblies will provide improved retention of the hose material. The service life of the hose assemblies will be improved.

Adaptable To: The new 397-1924 Permanent Coupling As replaces the former 8T-1710 Permanent Coupling and the new 397-1928 Permanent Coupling As replaces the former 8T-1711 Coupling As in the 331-5158 Hose As and 348-1934 Hose As .

The 331-5158 Hose As and 348-1934 Hose As are part of 371-4800 Service Brake Gp.

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Illustration 1	g03271073

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Illustration 2	g03271075
View of area A

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Table 1
Parts List for 331-5158 Hose As
Item	Qty	Part Number	Description
1	1	397-1924	Permanent Coupling As
2	134 cm	238-8340	Hose
3	1	397-1928	Permanent Coupling As

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Table 2
Parts List for 348-1934 Hose As
Item	Qty	Part Number	Description
1	2	397-1924	Permanent Coupling As
2	50 cm ⁽¹⁾	238-8340	Hose
3	2	397-1928	Permanent Coupling As

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^( 1 )

for each 348-1934 Hose As

The 397-1924 Permanent Coupling As (1), 238-8340 Hose (2), and 397-1928 Permanent Coupling As (3) are adaptable and effective in production with the machines listed in Table 3.

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Table 3
Sales Model	Adaptable Serial Numbers	Effective Serial Numbers
773G	S/N:JWS1-220	S/N:JWS221-UP
	S/N:MWH1-257	S/N:MWH258-UP
	S/N:T5S1-114	S/N:T5S115-UP
	S/N:T5T1-101	S/N:T5T102-UP
775G	S/N:MJS1-342	S/N:MJS343-UP
	S/N:RFM1-471	S/N:RFM472-UP
	S/N:T5F1-101	S/N:T5F102-UP
	S/N:T5W1-107	S/N:T5W108-UP