MAINTENANCE OF HYDRAULIC SYSTEM

TM-5-3820-256-24-1 Drilling System Manual
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e. Slide the piston and rod out of the tube. Remove the nut (14) to remove the piston (18) from the rod (19). Remove the packing (17) from the piston rod. Remove the backup washers (15) and packing (16) from the piston. 4-17.2.2 Cleaning, Inspection, and Repair. Discard all packing (12 and 16), wiper (7), backup washers (11 and 15), and seals (10 and 17) and use new parts each time cylinder is disassembled. Clean all other parts with an approved cleaning solvent. Inspect the piston and rod for burrs, wear, scoring, pitting or other damage. Check the nylon ball (2) for damage or wear. Replace parts as needed. 4-17.2.3 Assembly and Installation. a. Coat all packing, seals, wiper, and backup rings with hydraulic oil before assembly. b. Clamp the bottom clevis (8) in a vice with the cylinder end up. Install the packing (11) and backup washer (12) on the bottom clevis (8); assemble the tube onto the clevis. c. Install the packing (16) and backup washers (15) on the outside diameter of the piston (18). Install packing (17) onto the piston rod (19). d. Install wiper (7) in the inside diameter of the rod guide (6); then install seal (10) packing (11) and backup washer (12) on the outside diameter of the rod guide. e. Insert piston rod (19) through the rod guide (6). Install assembled piston onto the rod. Install nut (14) on the piston rod. f. Insert the piston end of the assembly into the tube, lowering it until the rod guide mates inside the tube. Fasten nuts (5) onto one end of the tie rods (9) and insert the tie rods through the rod guide (6) and clevis (8). Aline the rods and install the other nuts (5). Tighten the nuts securely. g. Screw the clevis (4) onto the piston rod. Install the cylinder, inserting the clevis and cotter pins (1). Aline the clevis (4), adjusting as necessary; then install the ball (3) and set screw (2), 4-18 MAINTENANCE OF HYDRAULIC SYSTEM 4-18.1 Hydraulic Piping Assembly (Figure 4-42). Maintenance of the hydraulic piping consists of periodically checking the system for evidence of any leakage. Tighten any loose connections and replace any ruptured hoses or piping. 4-18.2 Hydraulic Filter (Figure 4-43). 4-18.2.1 Cleaning and Inspection. Check the dirt alarm gage (4) daily. When the gage indicates a dirty filter, replace the element. Before disassembling the filter, clean the cap assembly (1) and the area around the cap to ensure dirt does not fall into the bowl while the cap is removed. 4-169

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