© 2021 Baker Hughes Company. All rights reserved.
48 | Baker Hughes
Body
Shut off the air supply. Disconnect air lines, linkage if reciprocating, and electrical connections
if 4700E/4800E. If positioner is reverse acting, refer to applicable section under “Cam Lobe
Change” on page 38 to safely remove cam. Remove screw (28), washer (27), cam (26).
Separate positioner from actuator by removing screws (29) and washers (30).
Disassembly
See Figure 18 (page 56) and Figure 19 (page 58).
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 the diaphragm 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 the module.
Inspect for any nicks or deterioration. Replace if necessary. Clean bottom of 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.
.
Summary of Contents for Masoneilan 4700P
Page 16: ...2021 Baker Hughes Company All rights reserved 16 Baker Hughes Figure 5 87 88 Actuator...
Page 30: ...2021 Baker Hughes Company All rights reserved 30 Baker Hughes Figure 12 FM Installation...
Page 32: ...2021 Baker Hughes Company All rights reserved 32 Baker Hughes Figure 14 ATEX Installation...
Page 64: ...2021 Baker Hughes Company All rights reserved 64 Baker Hughes NOTES...
