374D Excavator Machine System Specifications Boom Cylinder Caterpillar


Boom Cylinder
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Illustration 1g02145673

(1) 234-3748 Sleeve Bearing

Inside diameter ... 140.38 ± 0.04 mm (5.527 ± 0.002 inch)
Outside diameter ... 164.290 ± 0.013 mm (6.4681 ± 0.0005 inch)
Installation depth of the sleeve bearing ... 9.85 ± 0.30 mm (0.388 ± 0.012 inch)

Note: Before assembly, lubricate the threads with molybdenum disulphide.

(2) Torque for the locknut ... 13500 ± 700 N·m (9960 ± 520 lb ft)

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

(4) Lubricate the inside diameter and the outside diameter of the seal assembly with clean grease.

(A) Diameter of the rod assembly ... 129.93 ± 0.03 mm (5.115 ± 0.001 inch)

(B) Bore of the cylinder assembly ... 190.050 ± 0.025 mm (7.4823 ± 0.0010 inch)

(C) Bore of the head over two lands ... 130.630 ± 0.030 mm (5.1429 ± 0.0012 inch)

(5) 148-3381 Bearing

Inside diameter ... 140.34 ± 0.02 mm (5.525 ± 0.001 inch)
Outside diameter ... 164.290 ± 0.013 mm (6.4681 ± 0.0005 inch)
Installation depth of the sleeve bearing ... 10.0 ± 0.5 mm (0.39 ± 0.02 inch)

(6) The slit of the seal ring must turn in the direction of the piston.

(7) 114-0763 Sleeve Bearing

Outside diameter ... 135.153 ± 0.033 mm (5.3210 ± 0.0013 inch)
Thickness ... 2.475 ± 0.025 mm (0.0974 ± 0.0010 inch)

(8) Lubricate the sealing lip of the buffer seal lightly with the lubricant that is being sealed.

(9) Lubricate the sealing lip of the U-cup seal lightly with the lubricant that is being sealed.

(10) Lubricate the sealing lip of the lip type seal lightly with the lubricant that is being sealed.

(11) Before assembly, apply green Loctite 609 to the wiper seal groove.

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