3-19. A sequence of operations best suited to the particular machine and to the economy and quality of the work shall be followed. In order to assure replacement of parts in their proper sequence, adequate identification of parts and accessories shall be accomplished by numbered tags where complicated drive systems, gear trains, etc. are being handled. Where match marks have not been made, such match marks shall be made on mating precision parts and parts shall be reassembled to the marks. Orderly laying out and palletizing of parts and assemblies on greaseproof paper is recommended to eliminate any possibility of improper assembly and to assist in inspection. 3-20. Jacks and wheel pullers shall be used to remove pressed, bushed, keyed, or shimmed fits. Pinch bars or similar systems of leverage shall not be used to remove critical operating parts. 3-21. Suitable overhead handling systems shall be provided in processing areas for removal of cast housings and assemblies. Where installed over- head cranes are not available, portable "A frames" shall be used. Care shall be exercised in rigging arrangements to avoid scoring of machine surfaces, Lift shall be applied slowly and uniformly, to avoid the harnmful effects of snatching. In the process of removing heaving assemblies, care shall be exercised to avoid overloading over-hanging portions of the machine, 3-22. HYDRAULIC SYSTEMS, All used hydraulic oil, sludge accwmlations, tems. Organic type packing shall be removed and attached to the machine corrosion, and other foreign matter shall be removed fram hydraulic sysso that they will be available for reference at time of reactivation (neo- phrene packings need not be removed). 3-23, Care shall be exercised in the removal and reassembly of heavy pis- tons to avoid scoring of working surfaces. At the option of the responsible personnel, large pistons may be stored outside the cylinders when adequately identified, boxed, and stored with the machine. 3-24. Type P-3 preservative shall be applied throughout hydraulic sys- tems. The systems shall be clearly marked with a waterproof tag, or equivalent, which is tightly secured to the machine in a conspicuous location. The tag shall contain the following information: CAUTION! REPLACE PACKING AND REFILL WITH SUITABLE HYDRAULIC OIL BEFORE EQUIPMENT IS PLACED IN OPERATION, 3~25, Valves and valve shafts will require careful handling and inspec- tion to remove any evidence of corrosion, to free valves that have froz- en in position, and to determine any damage that has taken place. 3-26. Pumps shall be dismantled, cleaned, and preserved in accordance with the general requirements of this specification, and pump motors shall 18-31