784C and 785C Off-Highway Truck/Tractors Air System and Brakes Caterpillar

Illustration 1	g00493893
Top View

(1) Torque for eight bolts ... 3.00 ± 0.25 N·m (26.552 ± 2.213 lb in)

Illustration 2	g00501691
Section A-A

(2) 121-2052 Spring

Length under test force ... 8.0 mm (0.32 inch)

Test force ... 17.72 ± 0.53 N (3.984 ± 0.119 lb)

Free length after test ... 12.7 mm (0.50 inch)

Outside diameter ... 10.312 mm (0.4060 inch)

(3) 121-2051 Spring

Length under test force ... 46.0 mm (1.81 inch)

Test force ... 21.00 ± 0.63 N (4.721 ± 0.142 lb)

Free length after test ... 53.53 mm (2.108 inch)

Outside diameter ... 15.24 mm (0.600 inch)

(4) 118-5087 Spring

Length under test force ... 50.0 mm (1.97 inch)

Test force ... 243 ± 19 N (55 ± 4 lb)

Free length after test ... 63.5 mm (2.50 inch)

Outside diameter ... 35.58 mm (1.401 inch)

(5) 118-5086 Spring

Length under test force ... 55.0 mm (2.17 inch)

Test force ... 438 ± 35 N (98 ± 8 lb)

Free length after test ... 76.2 mm (3.00 inch)

Outside diameter ... 49.2 mm (1.94 inch)

Illustration 3	g00103227
View B-B

Illustration 4	g00103229
Section C-C

Illustration 5	g00103234
Section D-D

(6) 7S-8491 Spring

Length under test force ... 25.4 mm (1.00 inch)

Test force ... 19.2 ± 1.6 N (4.31 ± .35 lb)

Free length after test ... 41.1 mm (1.62 inch)

Outside diameter ... 30.18 mm (1.188 inch)

Illustration 6	g00103235
Section E-E

(7) Torque for the screen assembly ... 13 ± 3 N·m (9.6 ± 2.2 lb ft)

Illustration 7	g00103237
View F-F

(8) Hoist counterbalance valve

Cracking pressure ... 6900 + 700 - 0 kPa (1000 + 100 - 0 psi)

Illustration 8	g00103238
Section G-G

(9) Rear brake oil cooler relief valve

Relief valve pressure setting ... 790 ± 20 kPa (115 ± 3 psi)

Torque for valve body ... 185 ± 15 N·m (136 ± 11 lb ft)

(10) Torque for plug ... 125 ± 15 N·m (92 ± 11 lb ft)

(11) 8B-4624 Shim

Quantity ... 5

Thickness ... 0.81 mm (0.032 inch)

Note: Adjust the number of shims here.

(12) 8B-4624 Shim

Quantity ... 7

Thickness ... 0.81 mm (0.032 inch)

Note: Do not adjust the number of shims here.

(13) 6J-3380 Spring

Length under test force ... 60.5 mm (2.38 inch)

Test force ... 653.9 ± 51.6 N (147.0 ± 11.6 lb)

Free length after test ... 86.6 mm (3.41 inch)

Outside diameter ... 34.95 mm (1.376 inch)

(14) Hoist dual stage relief valve

(15) Apply sealant to the threads of the plug.