374D Excavator Machine System Specifications Bucket Cylinder Caterpillar


Bucket Cylinder
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Illustration 1g02145773

(1) 198-5529 Bushing

Inside diameter ... 120.320 ± 0.020 mm (4.7370 ± 0.0008 inch)
Outside diameter ... 140.260 ± 0.013 mm (5.5220 ± 0.0005 inch)
Installation depth of the bushing ... 10.0 ± 0.3 mm (0.39 ± 0.01 inch)

(A) Outside diameter of the piston

Diameter of the piston over the front two lands ... 198.90 ± 0.03 mm (7.831 ± 0.001 inch)
Diameter of the piston over the rear two lands ... 198.00 ± 0.10 mm (7.795 ± 0.004 inch)

(B) Bore of the cylinder assembly ... 200.050 ± 0.025 mm (7.8760 ± 0.0010 inch)

(C) Diameter of the rod ... 139.930 ± 0.038 mm (5.5090 ± 0.0015 inch)

(D) Bore of the head over two lands ... 140.630 ± 0.030 mm (5.5366 ± 0.0012 inch)

(2) Torque for the bolts ... 900 ± 100 N·m (664 ± 74 lb ft)

(3) 6E-0813 Bushing

Inside diameter ... 130.32 ± 0.02 mm (5.131 ± 0.001 inch)
Outside diameter ... 154.270 ± 0.013 mm (6.0736 ± 0.0005 inch)
Installation depth of the bushing ... 10.0 ± 0.5 mm (0.39 ± 0.02 inch)

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

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

Note: Before assembly, lubricate the threads of the piston (6) with hydraulic oil.

(6) Torque for the piston ... 20000 ± 1000 N·m (14751 ± 738 lb ft)

(7) 128-9261 Bushing

Outside diameter ... 145.153 ± 0.033 mm (5.7147 ± 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.

Note: Apply red Loctite 271 to the threads of the socket setscrews.

(12) Torque for two socket setscrews ... 125 ± 20 N·m (92 ± 15 lb ft)

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