2008/08/11 Caterpillar

Off-Highway Truck/Tractor:

773F (S/N: EED1-UP)

777F (S/N: JRP1-UP)

Quarry Truck:

775F (S/N: DLS1-UP)

Service Magazine SEPD0953, 11 August 2008, "The Crankcase Breather for the Engine is Relocated". Disregard this article. See the replacement article that follows.

Description of Change: The engine crankcase breather has been relocated in order to reduce spillage of oil during the operation of the truck on a grade.

Adaptable To:

Table 1

Required Parts for 773F and 775F
Item	Quantity	Part Number	Description
1	1	273-8703	Cover
2	1	227-5538	O-Ring Seal
3	4	1A-2029	Bolts
4	4	5M-2894	Hard Washers
5	2	223-1993	Covers
6	2	224-7506	Valve Cover Seals
7	2	5P-1255	Hose (1)
8	4	9M-2904	Clamps
9	2	282-9105	Breathers
10	2	292-1163	Elbows
11	4	126-0559	Bolts
12	4	4D-7388	Clips
13	1	6S-4258	Spacer
14	2	7X-0291	Bolts
15	2	8T-4896	Hard Washers
16	1	090-8747	Spacer
17	1	294-1871	Tube
18	1	294-1872	Tube
19	2	8T-4136	Bolts
20	2	8T-4121	Hard Washers
21	2	5P-8211	O-Ring Seals
22	2	033-6031	O-Ring Seals

( 1 )

11.5 cm (4.5275 inch) long

Table 2

Required Parts for 777F
Item	Quantity	Part Number	Description
1	1	273-8703	Cover
2	1	227-5538	O-Ring Seal
3	4	1A-2029	Bolts
4	4	5M-2894	Hard Washers
5	2	223-1993	Covers
6	2	224-7506	Valve Cover Seals
7	2	6N-3792	Hoses
8	4	9M-2904	Clamps
9	2	282-9105	Breathers
10	2	292-1163	Elbows
11	4	126-0559	Bolts
15	2	8T-4896	Hard Washers
19	2	8T-4136	Bolts
20	2	8T-4121	Hard Washers
21	1	298-6589	Tube
22	1	298-6588	Tube
23	2	6V-2235	Clips
24	2	8T-4136	Bolts
25	2	8T-4896	Hard Washers
26	2	8T-4121	Hard Washers
27	1	298-6591	Bracket
28	1	4L-6454	Bolt
29	1	298-6590	Bracket
30	1	5N-7917	Spacer
31	1	7X-0297	Bolt
32	2	5P-8211	O-Ring Seals
33	2	033-6031	O-Ring Seals

To relocate the crankcase breather to the valve covers for the engine, use the procedure that follows:

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Illustration 1	g01621873
This view is typical for the 773F engine and the 775F engine.

1. Remove the fumes disposal group.

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Illustration 2	g01622168
This view is typical for the 773F engine and the 775F engine.

2. Install cover (1) and O-ring seal (2) with four bolts (3) and four hard washers (4) .

   Note: Refer to Step 3 through Step 13 for the 773F and the 775F Off-Highway Truck.

   Note: Refer to Step 14 through Step 22 for the 777F Off-Highway Truck.

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Illustration 3	g02141996
This view is typical for the 773F engine and the 775F engine.

3. For the 773F and the 775F Off-Highway Truck, remove the rear valve covers from each side of the engine. See Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

4. Install two new covers (5) and two valve cover seals (6) .

5. Install one O-ring seal (21) to each elbow (10). Before installation, lightly lubricate the O-ring seal with engine oil and lightly lubricate the O-ring groove with engine oil. Install an elbow (10) to each cover (5) with two bolts (11) .

6. Install one O-ring seal (22) to each breather (9). Before installation, lightly lubricate the O-ring seal with engine oil and lightly lubricate the O-ring groove with engine oil. Install a breather (9) to each elbow (10) .

7. Install a hose (7) to each breather (9) with clamp (8) .

8. Install tube (17) to the hose (7) for the LH breather with clamp (8) .

9. Secure tube (17) to the engine with clip (12), spacer (13), bolt (14), and hard washer (15) .

10. Secure tube (17) to the engine block with clip (12), bolt (19), and hard washer (20) .

11. Install tube (18) to the hose (7) for the RH breather with clamp (8) .

12. Secure tube (18) to the engine with clip (12), spacer (13), bolt (14), and hard washer (15) .

13. Secure tube (18) to the engine block with clip (12), bolt (19), and hard washer (20) .

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Illustration 4	g02141999
View of the 777F Engine

14. For the 777F Off-Highway Truck, remove the center valve covers from each side of the engine. See Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".

15. Install two new covers (5) and two valve cover seals (6) .

16. Install one O-ring seal (32) to each elbow (10). Before installation, lightly lubricate the O-ring seal with engine oil and lightly lubricate the O-ring groove with engine oil. Install an elbow (10) to each cover (5) with two bolts (11) .

17. Install one O-ring seal (33) to each breather (9). Before installation, lightly lubricate the O-ring seal with engine oil and lightly lubricate the O-ring groove with engine oil. Install a breather (9) to each elbow (10) .

18. Install a hose (7) to each breather (9) with clamp (8) .

19. Install tube (21) to the hose (7) for the LH breather with clamp (8) .

20. Secure tube (21) to the engine block with clip (23), bolt (24), hard washer (25), bracket (27), bolt (28), and hard washer (26) .

21. Install tube (22) to the hose (7) for the RH breather with clamp (8) .

22. Secure tube (22) to the engine block with clip (23), bolt (24), hard washer (25), bracket (29), spacer (30), bolt (31), and hard washer (26) .

The relocation of the breather is effective with the following machines:

• 773F: DLS375-UP

• 775F: EED372-UP

• 777F: JRP543-UP

The relocation of the breather is adaptable to the following machines:

• 773F: DLS1-374

• 775F: EED1-371

• 777F: JRP1-542