573-2.pdf

MOC-573-2

September 2000

National Oceanic and Atmospheric Administration Marine Operation Center

Standard Specification MOC-573-2

OVERHAUL/REPAIR OF HYDRAULIC CYLINDERS

1. SCOPE: This specification provides the minimum requirements for the overhaul and/or repair of hydraulic cylinders.

2. REFERENCES

None

3. REQUIREMENTS

3.1 Tag out system controllers and actuators to preclude

inadvertent operation and secure the movable member to prevent movement while cylinder is removed.

3.1.1 Disconnect and cap hydraulic lines from the cylinder.

Ensure containment is provided to prevent spillage of oil.

Hydraulic lines and inlet/outlet ports shall be capped or plugged with threaded fittings to prevent leakage or contamination of the system.

3.1.2 Remove the cylinder from the ship and transport to

repair facility.

3.2 Perform the following work on the removed cylinder:

3.2.1 Completely disassemble the cylinder and clean all

parts.

3.2.2 Prepare and preserve the external painted surfaces in

accordance with the identified painting specification or as original.

3.2.3 Reassemble the cylinder under clean conditions using

new "O" rings, seals, gaskets, packing, and piston rings.

Materials used shall meet or exceed original manufacturers specifications. During reassembly lubricate the above with a product equal to Hilton's Hyper-Lube, that is compatible with the system fluid.

3.2.4 Provide and install new nuts, washers, bolts, studs and inlet and outlet fittings.

3.3 Reinstall the cylinder in its original location.

MOC-573-2

September 2000

3.4 Top off hydraulic reservoir to full mark and purge all air from the system taking care to contain any fluid bled off.

3.5 Remove tag outs.

4. QUALITY ASSURANCE

4.1 After disassembly, inspect all components for trueness of bore and rod, wear, damage, corrosion or pitting. Provide a Condition Report detailing the inspection results, contractor's corrective action recommendations, and list of additional parts, material and labor not covered by this specification, required to restore the cylinder to the manufacturers specifications.

4.2 After reassembly, bench test the assembly at system working pressure to prove smoothness of operation and tightness of sealing surfaces.

4.3 Cycle the cylinder through a minimum of four evolutions to demonstrate operation and tightness of all disturbed fittings and connections. Upon satisfactory demonstration of operation and tightness apply "Denso tape" to all connections.

END OF SPECIFICATION