NUT 5F7354 - Caterpillar

At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.
Lower the boom to the ground.
Release the system pressure. Refer to Disassembly and Assembly, "System Pressure - Release".
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Disconnect grease hose assembly (1).
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Attach a suitable lifting device to boom cylinder (4). The weight of boom cylinder (4) is approximately 440 kg (970 lb).
Remove bolts (2). Remove retainer plate (3) and the spacer.
Repeat step 5 in order to remove the retainer plate on the opposite boom cylinder.
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Install Tooling (A) in pin (5). Use a hammer to drive pin (5) out of boom cylinder (4).
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Disconnect grease hose assembly (6). Repeat Steps 4 through 7 in order to disconnect the boom cylinder from the opposite side.
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Remove step (7).
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Install Tooling (A) onto the hydraulic tank. Attach an air supply hose onto Tooling (A). Apply 276 to 414 kPa (40 to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.
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Disconnect three hose assemblies (8). Disconnect four hose assemblies (9). Disconnect four hose assemblies (11). Disconnect harness assembly (10).
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Disconnect two hose assemblies (12).
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Illustration 10 g01206162Note: Make sure that pin (5) is centered in the pin bore of the boom.
Install retainer plates (3) and bolts (2) on both sides of pin (5). Install pin assembly (15) and bolt (14).
Attach Tooling (B) and a suitable lifting device to boom (13). The weight range of boom (13) can be approximately between 4000 kg (8820 lb) and 4600 kg (10140 lb).
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Attach a suitable lifting device to Tooling (C). The weight of Tooling (C) is approximately 191 kg (420 lb). Attach Tooling (C) to pin assembly (16).
Remove bolt (17). Use Tooling (C) to remove pin assembly (16). Remove pin assembly (16) until the boom is free from the upper frame. The weight of pin assembly (16) is approximately 122 kg (270 lb). Note: Reposition the suitable lifting device as pin assembly (16) is being removed.
Remove the boom and the shims. Put identification marks on the shims for assembly purposes.