315C Excavator Machine Systems Caterpillar

Removal Procedure

1. Start the machine. Fully extend the stick. Fully extend the bucket. Lower the stick and the bucket to the ground.

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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

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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.

2. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".

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Illustration 1	g00357232

3. Attach a suitable lifting device to the rod end of the bucket cylinder, as shown. Put a wood block (3) under the link assemblies as a support.

4. Remove the nuts and retaining bolt (1) . Remove pin (2) .

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Illustration 2	g00357292

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

5. Raise bucket cylinder (4) until the cylinder is level. Attach a suitable lifting device to the head end of the bucket cylinder, as shown. Disconnect two hose assemblies (5) from the bucket cylinder. Put plugs in the ends of the hose assemblies. Plugs prevent oil loss. Plugs prevent contaminating the hydraulic system.

6. Remove retaining bolt (6) , the washer, pin assembly (7) and the spacer. Remove the bucket cylinder. The weight of the bucket cylinder is approximately 135 kg (300 lb).

Note: Shims may be used between the stick and the bucket cylinder. These shims are used to adjust the lateral clearance between the components at the pin joint. Put identification marks on all shims for assembly purposes.

7. Remove the shims that are used at the pin joint for the bucket cylinder.

Disassembly and Assembly Information

Start By:

1. Remove the bucket cylinder. Refer to Disassembly and Assembly, "Bucket Cylinder - Remove".

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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

Illustration 3	g01012413

(1) Lubricate the face of the locknut and threads of the locknut with Tooling (G) prior to assembly. More than one bucket cylinder is available for this machine. Refer to Specification, "Bucket Cylinder" for the proper torque value for your part number.

Torque for locknut ... 4500 ± 230 N·m (3319 ± 170 lb ft)

Torque for locknut ... 3600 ± 180 N·m (2655 ± 133 lb ft)

(2) Lubricate the inside diameter and the outside diameter with Tooling (G) .

(3) Lubricate the sealing lip slightly with the lubricant that is being sealed.

(4) Apply Tooling (F) to the groove of the wiper seal prior to assembly.

(5) Install the bearing in the bearing bore. ... 7.35 ± 0.50 mm (0.289 ± 0.020 inch)

(6) Lubricate the sealing lip slightly with the lubricant that is being sealed.

Install the seal in the bearing bore. ... 1.00 ± 0.50 mm (0.039 ± 0.020 inch)

(7) Install the bearing in the bearing bore. ... 5.00 ± 0.50 mm (0.197 ± 0.020 inch)

(8) Lubricate the sealing lip slightly with the lubricant that is being sealed.

Install the seal in the bearing bore. ... 0.50 ± 0.50 mm (0.020 ± 0.020 inch)

Installation Procedure

1. Be sure that the pin bores in the stick, in the link assemblies, and in the bucket cylinder are clean and free of dirt prior to installation of the bucket cylinder.

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Illustration 4	g00357292
Typical example

2. Attach a suitable lifting device to bucket cylinder (4) , and put the bucket cylinder in position on the stick. Be sure that the pin bores in the stick and bucket cylinder are in alignment. Also, be sure that the grease fittings in the head end and in the rod end of the bucket cylinder are facing away from the stick.

3. Apply Tooling (G) on pin assembly (7) . Temporarily install the pin assembly. Do not remove the suitable lifting device from the bucket cylinder at this time.

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Illustration 5	g00357375
Top view of stick and bucket cylinder

4. Slide the bucket cylinder to one side until the bucket cylinder makes contact with the stick. Measure the total clearance between the bucket cylinder and the stick at the pin bore. The total clearance of measurement (a) plus measurement (b) must not be more than 1.0 mm (0.04 inch). If the total clearance is less than 1.0 mm (0.04 inch), the addition of shims between the bucket cylinder and stick will not be required. If the total clearance is more than 1.0 mm (0.04 inch), the addition of shims between the bucket cylinder and the stick will be required.

5. Remove pin assembly (7) , if shims are required. Refer to Disassembly and Assembly, "Bucket Cylinder - Remove". Install the shims between the stick and bucket cylinder on the side opposite the retaining bolt for the pin assembly. Install the spacer and pin assembly (7) . Install the washer and retaining bolt (6) . Tighten retaining bolt (6) to a torque of 325 ± 40 N·m (240 ± 30 lb ft).

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Illustration 6	g00357377
Typical example

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Illustration 7	g00357378

6. Lower the bucket cylinder between the link assemblies. Apply Tooling (G) on pin (2) . Be sure that the bore in the bucket cylinder rod is aligned with the bores in the link assemblies. Install pin (2) . Install retaining bolt (1) and the nuts.

7. Rotate pin (2) until the pin is parallel with the link, as shown. Tighten the outside nut until the nut is 0.5 mm (0.02 inch) beyond the end of the retaining bolt, as shown. Tighten the inside nut against the outside nut to a torque of 200 ± 40 N·m (150 ± 30 lb ft).

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

8. Check the condition of the O-ring seals in the ends of hose assemblies (5) prior to installation. If the O-ring seals are damaged, use new parts for replacement. Connect the two hose assemblies to the bucket cylinder.

9. Fill the hydraulic oil tank with oil to the correct level. Refer to Operation and Maintenance Manual, "Capacities (Refill)". Lubricate the bucket cylinder support pins. Refer to Operation and Maintenance Manual for the correct procedure.

10. Start the machine, and run the machine at low idle speed. Remove wood block (3) . Move the control lever for the bucket cylinder so that the cylinder rod extends to the halfway position. Retract the cylinder rod. The cylinder should be cycled in this manner for approximately ten cycles in order to remove the air from the hydraulic system. Recheck the oil level in the hydraulic oil tank.