301.6C and 301.8C Mini Hydraulic Excavators Machine Systems Caterpillar

Blade Cylinder - Remove and Install

Usage:

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-1859	Retaining Ring Pliers	1

Start By:

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

Note: Put identification marks on all lines, on all hoses, on all wires, and on all tubes for installation purposes. Plug all lines, all hoses and all tubes. This helps to prevent fluid loss and this helps to keep contaminants from entering the system.

Note: Cleanliness is an important factor. Before you begin the removal procedure, the exterior of the components should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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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.

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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.

Drain the oil from the hydraulic tank into a suitable container for storage or disposal. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change".

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Illustration 1	g01182094

Remove plate assembly (1). Disconnect hose assemblies (2) .

Use Tooling (A) to remove retaining rings (4). Remove washers (3) .

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Illustration 2	g01182096

Remove pin assemblies (5) and blade cylinder (6) .

Disassembly and Assembly Information

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Table 2
Required Tools
Tool	Part Number	Part Description	Qty
B	5P-3520	Spanner Wrench	1
C	127-4904	Hydraulic Cylinder Repair Stand Gp	1
D	1P-0808	Multipurpose Grease	1
E	195-4609	Seal Pick	1
F	7M-7456	Bearing Mount Compound	1
G	9U-6833	Nut	1
	6V-7047	Single Acting Cylinder	1
	1U-7544	Hydraulic Hand Pump Gp	1
	5P-4197	Spacer	1
	FT-3038	Puller Plate	1
	5P-4776	Tool Stud	1

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Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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Illustration 3	g01182152

(1) Lubricate the seals.

(2) Apply Tooling (D) to the threads. Use Tooling (B) to tighten the head to a torque of 600 ± 130 N·m (443 ± 96 lb ft).

(3) Apply Tooling (F) to the seal groove prior to installation.

(4) Apply Tooling (D) to the threads and tighten the nut to a torque of 235 ± 24 N·m (173 ± 18 lb ft).

Installation Procedure

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Table 3
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-1859	Retaining Ring Pliers	1

Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Dirt and other contaminants can damage the precision component. Perform assembly procedures on a clean work surface. Keep components covered and protected at all times.

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