2015/03/19 Caterpillar

Off-Highway Truck/Tractor:

793FSeries AC (S/N: EMD1-UP)

793F (S/N: SND1-UP; SSP1-UP; RBT1-UP)

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

795F (S/N: SNT1-UP)

797F (S/N: LAJ1-UP; WSP1-UP)

Description of Change: The improved engine oil lines groups offer improved clamp joints for their respective oil cooler bypass tube.

Adaptable To: The improved engine oil lines groups are adaptable back to first production on the serial numbers listed above.

Refer to Table 1 for the affected engine oil lines group numbers.

Table 1

Improved Group Numbers
394-3930 Engine Oil Lines Gp
394-3933 Engine Oil Lines Gp
394-3936 Engine Oil Lines Gp
394-3939 Engine Oil Lines Gp

Refer to Table 2 for the list of parts needed to update the existing oil lines.

Table 2

New Part Number	Description	Quantity
344-9285	Ring	1
371-6762	Flange	2
269-7885	O-Ring Seal	2
8T-0643	Bolt	4
6V-5839	Washer	4
6V-1196	O-Ring Seal	2

This change is effective for the serial numbers listed in Table 3.

Table 3

Effective Serial Numbers

S/N:B7B01981-UP

S/N:B7C01004 -UP

S/N:JTL01151 -UP

S/N:LLM01431-UP

S/N:A4K01026-UP

Installation Instructions

Refer to Illustration 1 for the location of the oil cooler bypass tube that will be reworked.

Illustration 1	g03803150
(1) Oil cooler bypass tube

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Illustration 2	g03803416
(2) 260-9153 Plug (3) 241-6157 Plugs

1. Remove plugs (2) and (3) in order to drain the oil into a suitable container.

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Illustration 3	g03804122
(4) 6V-5230 Bolts

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Illustration 4	g03804137
Detail view of the tube end. (4) 6V-5230 Bolts (5) 6V-5839 Washers (6) 1W-4072 Retainers (7) 1W-4099 Retaining Ring (8) 9Y-2099 Flange

2. Remove bolts (4), washers (5) and retainers (6). Slide the oil cooler bypass tube out.

   Note: The washers are the only reusable parts.

3. Remove the flange (8). Discard the retaining ring (7) and all of the O-ring seals.

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Illustration 5	g03804139
(9) 371-6762 Flange (10) 344-9285 Ring

4. Install the flange (9) and the ring (10) as shown in Illustration 5.

   Note: The inside diameter of the flange (9 ) is tapered. The flange must be positioned on the tube with the large end of the taper toward the end.

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Illustration 6	g03804140
(11) 269-7885 O-Ring Seal (8) 9Y-2099 Flange

5. Install the O-ring (11) onto the tube end. Lubricate the O-ring with clean engine oil. Press the tube end into the flange (8) that was removed. Do not force the tube to the bottom of the flange. Leave some space (A). Do not pinch or roll the O-ring.

   Note: Ensure the O-ring (11) and mating surface are lubricated.

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Illustration 7	g03804143
(12) 6V-1196 O-Ring Seal (5) 6V-5839 Washers (13) 8T-0643 Bolts

6. Install the oil bypass tube

   Note: Use retention compound on the O-ring (12) .

   1. Using retention compound, install the O-ring (12) to the face of the flange (8) .

   2. Slide the tube into position and start the bolts (13) .

      Note: Ensure that the O-rings do not fall out or become pinched.

   3. Torque the bolts (13) to 55 ± 10 N·m (41 ± 7 lb ft).