2014/06/20 Caterpillar

New Filter Bypass Switch Is Now Used on Certain Large Off-Highway Trucks {1435, 3067, 5068}

Usage:

789C 2BW

Off-Highway Truck/Tractor: 785C (S/N: APX1641-UP) 785D (S/N: DMC1-UP; MSY84-UP) 789C (S/N: 2BW1497-UP) 789D (S/N: SPD1-UP; SHH1-UP) 793D (S/N: FDB1039-UP) 793FSeries AC (S/N: EMD76-UP) 793F (S/N: SND1-UP; SSP118-UP; RBT1-UP) 795FSeries AC (S/N: ERM153-UP) 797F (S/N: LAJ152-UP; WSP1-UP)

Service Magazine, SEPD1759, 24 March 2014, "New Filter Bypass Switch Is Now Used on Certain Large Off-Highway Trucks {1435, 3067, 5068}". Disregard the information in the article that is listed above. Refer to the information in the following article.

Description of Change: New Bypass Switch is now used on certain machines that are listed above. The new Bypass Switch has enhancements and improvements that are listed below:

Reduced fault plugged filter events.
Improved manufacturing process, end of line testing and changes to the internal mounting of the electronics to reduce component failures.
Addition of three small oil passages to allow trapped oil to escape from the backside of the switch plunger.
Addition of a strain relief on back of sensor housing to reduce wire chafing.

Adaptable To:

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Illustration 1	g03396811
Schematic symbol of new 391-7125 Bypass Switch

The new 391-7125 Bypass Switch is the direct replacement for the existing 164-7577 Bypass Switch Gp. The new Bypass Switch part number is listed in Table 1.

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Table 1
New Bypass Switch
Qty	New Part Number	Description	Former Part Number
4 ⁽¹⁾	391-7125	Bypass Switch	164-7577

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^( 1 )

Not all machines will require four sensors. Refer to the appropriate parts manual for the exact amount of 164-7577 Bypass Switch Gp sensors that need replaced.

The new Bypass Switch is adaptable to, and is effective in production with the serial numbers that are listed in Table 2.

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Table 2
New Bypass Switch
Sales Model	Adaptable Serial Number	Effective Serial Number
785C	S/N:APX1641-5001	S/N:APX5002-UP
785D	S/N:MSY84-601	S/N:MSY602-UP
785D OEM	S/N:DMC1-170	S/N:DMC171-UP
789C	S/N:2BW1497-83001	S/N:2BW83002-UP
789D	S/N:SPD1-582	S/N:SPD583-UP
789D XQ	S/N:SHH1-318	S/N:SHH319-UP
793D	S/N:FDB1039-1801	S/N:FDB1802-UP
793F	S/N:SSP118-943	S/N:SSP944-UP
793F AC	S/N:EMD76-100	S/N:EMD101-UP
793F CMD	S/N:RBT1-164	S/N:RBT165-UP
793F XQ	S/N:SND1-131	S/N:SND132-UP
795F AC	S/N:ERM153-281	S/N:ERM282-UP
797F	S/N:LAJ152-474	S/N:LAJ475-UP
797F XQ	S/N:WSP1-124	S/N:WSP125-UP