320C and 322C Excavators Attachment Hydraulic System – Boom Cylinder



Illustration 1 g00768513

(1) Torque for grease fitting … 9.3 ± 4.9 N·m (82.31 ± 43.37 lb in)

(2) Torque for locknut … 4780 ± 240 N·m (3526 ± 177 lb ft)

(3) Lubricate the inside diameter and outside diameter with clean grease.

(4) Install the seal ring with the slit toward the piston.

(5) Rod assembly

Diameter of rod … 85.0 mm (3.35 inch)
Minimum thickness for plating … 0.03 mm (0.001 inch)

(6) Bore of cylinder … 120.0 mm (4.72 inch)

(7) Torque for 12 bolts … 267 ± 40 N·m (197 ± 30 lb ft)

(8) Bore of head … 85.0 mm (3.35 inch)

Note: Make sure that the bearings are installed in the bore so that the identification numbers of the bearings are facing outward.

(9) 163-3753 Sleeve Bearing

Outside diameter … 95.102 ± 0.011 mm (3.7442 ± 0.0004 inch)
Inside diameter … 80.12 ± 0.02 mm (3.154 ± 0.001 inch)
Install the bearing in the bearing bore. … centered

(10) After tightening the setscrew (10) , stake the setscrew in two places.

Torque for setscrew … 57.0 ± 10.0 N·m (42.04 ± 7.38 lb ft)

Note: Make sure that the bearings are installed in the bore so that the identification numbers of the bearings are facing outward.

(11) 163-3746 Sleeve Bearing

Outside diameter … 95.102 ± 0.011 mm (3.7442 ± 0.0004 inch)
Inside diameter … 80.12 ± 0.02 mm (3.154 ± 0.001 inch)
Install the bearing in the bearing bore. … centered

(12) Install the seal in the bearing bore until dimension (A) is 1.00 ± 0.50 mm (0.039 ± 0.020 inch).

Quantity … 2

(13) Install the seal in the bearing bore until dimension (B) is 1.00 ± 0.50 mm (0.039 ± 0.020 inch).

Quantity … 2