New Main Relief Valve for Transmission Arrangement is Now Used On Certain 797F Off-Highway Trucks {3133, 3167, 3182, 4095} Caterpillar

Off-Highway Truck/Tractor

797F (S/N: LAJ142-622; WSP1-129)

Reference: Bench Test Procedures, REHS3602, "Bench Test Procedure for a 797F Off-Highway Truck Transmission"

Reference: Testing and Adjusting, KENR8371, "797F and 797F XQ Off-Highway Truck Power Train"

Description Of Change: New main relief valve for transmission arrangement is now used on the machines listed above. The new main relief valve increases the service life of clutch 7 friction disc and wave springs of transmission arrangements.

Adaptable To:

Illustration 1	g06174386

Illustration 2	g06174389
View of area A (some parts are removed for clarity) (1) 151-0187 Relief Valve Gp

New 151-0187 Relief Valve Gp (1) replaces the former 438-2216 Relief Valve Gp in 446-9392 Transmission Ar.

The new relief valve group (1) uses a top pressure of 2655 ± 138 kPa (385 ± 20 psi) at high idle and 2310 ± 138 kPa (335 ± 20 psi) at low idle.

Note: Adjust the former 438-2216 Relief Valve Gp to required relief valve group (1) specifications.

The new relief valve group (1) is adaptable to the machines within the listed serial numbers, and is effective in production with all machines after the listed serial numbers.