776D, 777D and 777D HAA Off-Highway Truck/Tractors Suspension Cylinder Caterpillar


Suspension Cylinder (Rear)

Usage:

777D 2YW



Illustration 1g00901967



Illustration 2g00901968

Note: When you assemble suspension cylinder, you must fill the cylinder with the proper amount of oil. Refer to the Testing and Adjusting, "Suspension Cylinder Oil Requirements" for the correct initial fill. See Testing and Adjusting, "Suspension Cylinder (Rear) - Purge and Charge" for the charging procedure and for the charging dimensions.

(A) Outside diameter of rod (over chrome) ... 228.52 ± 0.05 mm (8.997 ± 0.002 inch)

(B) Inside diameter of head (two places) ... 228.68 ± 0.03 mm (9.003 ± 0.001 inch)

(C) Inside diameter of cylinder ... 266.70 + 0.13 - 0.05 mm (10.500 + .005 - 0.002 inch)

(D) Outside diameter of rod (two places) ... 266.06 ± 0.13 mm (10.475 ± 0.005 inch)

(1) Apply a coat of 4C-5593 Anti-Seize Compound to four pins prior to assembly with the bearing.

Outside diameter of pin ... 82.461 ± 0.025 mm (3.2465 ± 0.0010 inch)
Inside diameter of bearing ... 82.5373 ± 0.0127 mm (3.2495 ± 0.0005 inch)

(2) Lubricate the sealing lip lightly with the lubricant that is being sealed.

(3) Torque for one relief valve ... 50 ± 10 N·m (37 ± 7 lb ft)

(4) Torque for one check valve assembly ... 50 ± 10 N·m (37 ± 7 lb ft)

(5) Torque for one valve ... 50 ± 10 N·m (37 ± 7 lb ft)

The charging medium for suspension cylinder is dry nitrogen.

Internal volume ... 6.7 L (4013 in3)

Charged pressure ... 100 kPa (14.5 psi)

Service pressure ... 750 kPa (110 psi)

Bursting pressure ... 6100 kPa (885 psi)

Charged safety factor ratio ... 61:1

Service safety factor ratio ... 8:1

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