2011/01/24 Caterpillar

Off-Highway Truck/Tractor:

773F (S/N: EED1-UP; EXD1-UP)

777F (S/N: WTK1-UP; JRP1-UP; JXP1-UP; LJW1-UP)

Quarry Truck:

775F (S/N: EYG1-UP; DLS1-UP)

Track-Type Tractor:

D10T (S/N: RJG1-UP)

D11T (S/N: GEB1-UP; TPB1-UP)

Underground Articulated Truck:

AD55B (S/N: JNW1-UP)

Wheel Dozer:

844H (S/N: BTW1-UP; EHX1-UP)

854K (S/N: 2211-UP)

Wheel Loader:

990H (S/N: BWX1-UP)

992K (S/N: H4C1-UP)

993K (S/N: Z9K1-UP)

Service Magazine SEPD1187, 13 December 2010, "A New Bolt for the Rocker Shaft on Certain C27 and C32 Engines Is Now Used". Disregard this article. Refer to the article that follows.

Description of Change: The new bolt is designed for extended service life.

Adaptable To:

Illustration 1	g02356778
(1) New 356-5212 Bolt (2) Valve mechanism (3) Rocker arm

Table 1

Effective Serial Numbers

S/N:EED01220-UP

S/N:EXD00124-UP

S/N:DLS01211-UP

S/N:EYG00103-UP

S/N:JRP02492-UP

S/N:JXP00175-UP

S/N:WTK00118-UP

S/N:BTW00199-UP

S/N:22100370-UP

S/N:BWX00523-UP

S/N:H4C00464-UP

S/N:Z9K00390-UP

S/N:JNW00191-UP

S/N:RJG2467-UP

S/N:GEB00722-UP

S/N:TPB00190-UP

S/N:LJW06300-UP

S/N:EHX06103-UP

The new 356-5212 Bolt is a direct replacement for 5J-5794 Bolt and 338-4562 Bolt. The new bolt is adaptable back to the first production of the listed machines. The change is effective at the factory with serial numbers listed in Table 1

Follow the procedure below in order to secure the rocker arms with the new bolts.

1. Lubricate the new 356-5212 Bolt threads and rocker arm shaft to bolt interface with clean engine oil before assembly.

2. Tighten the bolts in sequence 2,3,1,4. Refer to Illustration 1

3. Torque the bolts to 55 ± 5 N·m (41 ± 4 lb ft).

4. Retighten the bolts to 55 ± 5 N·m (41 ± 4 lb ft)

5. Turn the bolts in sequence 2,3,1,4 to 60° ± 5°

The bolt can be reused multiple times, but the bolt should be inspected before each reuse. Refer to Reuse And Salvage Guidelines, SEBF8301, "Inspection and Reuse of Critical Fasteners Used in All Engines".