GE Baker Hughes 2900-40 Series Maintenance Manual

Consolidated 2900-40 Series POSRV Maintenance Manual | 43© 2019 Baker Hughes, a GE company. All Rights Reserved.XVII. Disassembly of Pilot ValveA. 39PV07/37 DisassemblyFigures 30 and 311 Remove and discard the aluminum seals and sealing wire.2. Remove Cap (Compression Screw) by turningcounterclockwise.3. If a lifting lever is installed, also use Figure 31 to removethe Lifting Lever assembly. Then return to Figure 30 tocontinue disassembly.a. The Lifting Lever Assembly consists of:1 – Lever1 – Drive Pin1 – Cam Shaft1 – Bushingb. Remove Lifting Lever Assembly by turning Bushingcounterclockwise.c. Turn Cap (Compression Screw) counterclockwise.d. Measure distance from Release Lock Nut to the top ofthe Lifting Stem for reassembly later.e. Remove the Release Lock Nut and Release Nut byturning counterclockwise.4. Measure and record Compression Screw height for lateruse when resetting.5. Turn Compression Screw Lock Nut counterclockwise toloosen.6. Turn Compression Screw counterclockwise to remove theload on the Spring.7. Turn Set Screw counterclockwise to loosen.8. Bonnet can now be removed by turning counterclockwise.9. Spring and Spring Washers can now be removed.Note: If Lifting Lever option is equipped, there is no need to removeDrive Pin from Bottom Spring Washer assembly.10. Remove the four Cap Screws (Top Plate) holding the TopPlate to the Pilot Base. Remove and discard the SpringSeal (Main Piston) and O-Ring (Top Plate).11. Remove Main Piston from Pilot Base.12. Removing the Insert Assembly.The Insert Assembly consists of:1 - Insert Top1 - Insert Bottom1 - Spring Seal (Insert)1 - O-Ring (Insert)Remove Insert Assembly from the top of the Pilot Basewith tool #4995401 as shown in Figure 58. Remove anddiscard the O-Ring (Insert) on the bottom of the InsertAssembly. Disassemble Insert Assembly by removing theInsert Bottom from the Insert Top. Discard Spring Seal(Insert).13. Remove Adjuster Cap from the bottom of the Pilot Baseby turning counterclockwise.14. Loosen Adjuster Lock Nut by turning counterclockwise.15. Removing the Adjuster Assembly.The Adjuster Assembly consists of:1 – Adjuster Top1 – Adjuster Bottom1 – O-Ring (Adjuster Top)1 – O-Ring (Adjuster Bottom)1 – Spring Seal (Adjuster Top)16. Turn Adjuster Assembly clockwise counting the numberof flats until assembly stops. Record number of flats forreassembly.17. Remove Adjuster Assembly from the Pilot Base by turningcounterclockwise. Remove O-Ring (Adjuster Top) andO-Ring (Adjuster Bottom) from adjuster assembly anddiscard. Disassemble Adjuster Top from the AdjusterBottom by turning Adjuster Top counterclockwise.Remove Spring Seal (Adjuster Top) from Adjuster Top anddiscard.18. Refer to Field Test Connection / Backflow PreventerOption (Section XXII.A) for disassembly of Field TestConnectionB. Cleaning1. Clean parts to remove all rust, burrs, scale, organicmatter, and loose particles. Parts are to be free of anyoil or grease except for lubrication as specified in thisinstruction.2. Cleaning agents used shall be such that effective cleaningis assured without injuring the surface finishes ormaterial properties of the part.3. Acceptable cleaning agents include demineralized water,nonphosphate detergent, acetone, and isopropyl alcohol.Parts must be blown dry or wiped dry after cleaning.4. If you are using cleaning solvents, take precautions toprotect yourself from potential danger from breathing