GE Masoneilan 4700P Maintenance Manual

Also see for Masoneilan 4700E: Instruction manual

Contents

Masoneilan 4700P/E & 4800P/E Positioners Manual =| 59© 2015 General Electric Company. All rights reserved.BodyShut off the air supply. Disconnect air lines, linkage if reciprocating, and electrical connections if4700E/4800E. If positioner is reverse acting, refer to applicable section under “Cam LobeChange” on page 49 to safely remove cam. Remove screw (28), washer (27), cam (26). Separatepositioner from actuator by removing screws (29) and washers (30).DisassemblySee Figure 19 on page 68 or Figure 20 on page 71.1. Remove pressure gauges (12) (13), and on 4700P/4800P only (14).2. Remove the pilot subassembly (11).3. Remove retaining ring (17), washer (16), lever S/A (3), and spring (5).4. On 4700E/4800E only, remove 4 screws (21) to separate I/P module from body.CAUTION Do not damage or lose the three O-rings on bottom of module.5. Remove cap screws (10) and separate body S/A from the case S/A.6. Remove the diaphragm assembly (9), and reducer plate if 6-30 psi range 4700P/4800P.7. Clean the body (1). Avoid the use of detergents that might deteriorate thediaphragm S/A. Use isopropyl alcohol. Do not use chloride-based solvents.8. On 4700E/4800E, carefully remove the three O-rings from the bottom of themodule. Inspect for any nicks or deterioration. Replace if necessary. Clean bottomof module using isopropyl alcohol. Carefully reassemble O-rings into grooves.Make sure they are seated in bottom of groove.CAUTION Do not use any lubrication on O-rings or base.