2012/02/06 Caterpillar

Off-Highway Truck:

793F (S/N: SND1-UP; SSP1-UP)

795FSeries AC (S/N: ERM1-UP)

797F (S/N: LAJ1-UP)

Service Magazine SEPD1313, 10 August 2011, "The Buffers for the Exhaust Temperature Sensors Are Relocated on C175 Engines in 793F and 797F Off-Highway Trucks". The original article was revised to add the 793F S/N:SND
and the 795F S/N:ERM
. The effective serial numbers have also been added. No other information has changed.

The buffers for the exhaust temperature sensors were relocated to a lower retention bolt on the valve covers. Relocation of the buffers reduces the possibility of damage from overheating.

If a problem occurs with a buffer for either of these temperature sensors in the original location, install a new sensor and relocate the buffer:

• 247-7635 Temperature Sensor Gp

• 345-9731 Exhaust Temperature Sensor Gp

Install a new 345-9731 Exhaust Temperature Sensor Gp with the buffer located on the valve cover as shown below.

Illustration 1 shows the original location of the buffer on the left side of the engine. Illustration 2 shows the routing of the wire and the new location for the buffer on the left side of the engine.

Illustration 3 shows the original location of the buffer on the right side of the engine. Illustration 4 shows the routing of the wire and the new location for the buffer on the right side of the engine.

Illustration 1	g02672918
Original location of the buffer on the left side of the engine

Illustration 2	g02673121
Routing of the wire and new location of the buffer on the left side of the engine

Illustration 3	g02673123
Original location of the buffer on the right side of the engine

Illustration 4	g02673125
Routing of the wire and new location of the buffer on the right side of the engine

The effective serial numbers are listed in Table 1.

Table 1

S/N:SSP00408

S/N:SND00106

S/N:ERM00185

S/N:LAJ00282