M312 Excavator Machine System Caterpillar

Boom Cylinder

Usage:

M312 6TL

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Illustration 1	g03396237

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Table 1
Specification for 118-4979 Boom Cylinder Gp
Item	Qty	Part	Specification Description
1	1	229-1095 Bushing	Bore diameter before assembly is 60.15 ± 0.04 mm (2.368 ± 0.002 inch).
1	1	229-1095 Bushing	Installation depth is 6.5 ± 0.5 mm (0.26 ± 0.02 inch).
A	1	118-4999 Cylinder As	Bore diameter is 100.000 to 100.054 mm (3.9370 to 3.9391 inch).
2	1	114-9323 Head	Bore over two lands is 70.53 ± 0.03 mm (2.777 ± 0.001 inch).
B	1	136-6023 Rod As	Diameter is 69.93 ± 0.03 mm (2.753 ± 0.001 inch).
3	1	143-3836 Bushing	Bore diameter before assembly is 70.230 to 70.304 mm (2.7650 to 2.7679 inch).
3	1	143-3836 Bushing	Installation depth is 7.5 ± 0.5 mm (0.30 ± 0.02 inch).
4	1	143-8149 Special Locknut	Before assembly, apply 2P-9063 Hydraulic Oil to the face and threads.
4	1	143-8149 Special Locknut	Torque to 2900 ± 90 N·m (2139 ± 66 lb ft).
5	1	119-5456 Ring	Lubricate the inside diameter and the outside diameter with clean grease.
6	1	9X-7298 Seal As	Lubricate the inside diameter and the outside diameter with clean grease.
7	1	143-8025 Ring	Lubricate the inside diameter and the outside diameter with clean grease.
8	1	125-1552 Piston	Lubricate the inside diameter and the outside diameter with clean grease.
9	1	6I-6922 Seal Ring	Slit of ring must turn in direction of piston.
10	1	114-0753 Bushing	Outside diameter before assembly is 75.120 ± 0.025 mm (2.9575 ± 0.0010 inch).
10	1	114-0753 Bushing	Thickness is 2.475 ± 0.025 mm (0.0974 ± 0.0010 inch).
11	1	170-9841 Buffer Seal	Lubricate the sealing lip lightly with the lubricant that is being sealed.
12	1	170-9857 U-Cup Seal	Lubricate the sealing lip lightly with the lubricant that is being sealed.
13	1	165-9283 Lip Type Seal	Lubricate the sealing lip lightly with the lubricant that is being sealed.
14	-	-	Before assembly, apply green Loctite 609 to the wiper seal grooves.