49Mv22/72 - Baker Hughes Consolidated 4900 Series Instruction Manual

XVI. Disassembly of 4900 Series Pilot Valve (Cont.)
30. Remove Socket Head Cap Screw (qty. 2) to
remove Modulator Assembly from Pilot Base.
Remove and discard both O-Rings (Modulator
Base).
The Modulator Assembly consists of:
1 – Modulator Base
1 – Modulator Stop
1 – Modulator Piston Assembly
The Modulator Piston Assembly consists of:
1 – Modulator Piston Top
1 –Modulator Piston Bottom
1 – O-Ring Retainer
1 – Lock Screw
1 – O-Ring Modulator Piston Bottom
1 – Spring Seal (Piston Top)
1 – Spring Seal (Piston Bottom)
1 – O-Ring (Modulator Seat)
31. Remove Cap Screws (Modulator) holding
Modulator Stop to Modulator Base.
32. Modulator Base can now be removed by rotating
the Modulator Stop enough to be able to push
against the ears on the Modulator Base to
remove the Modulator Stop.
33. Remove both O-Rings (Modulator Stop) and
discard.
34. Disassemble the Modulator Piston Assembly by
removing the Lock Screw.
35. Remove and discard O-Ring (Modulator Piston
Bottom) and O-Ring (Modulator Seat). Be
careful not to bend the lip enclosing the O-Ring
(Modulator Seat) during its removal.
36. Discard Spring Seal (Piston Bottom) and Spring
Seal (Piston Top).
C. 49MV22/72
(Figures 20, 21, and 18)
1. Remove and discard the aluminum seals and
sealing wire.
2. Remove Cap (Compression Screw) by turning
counterclockwise.
3. If a lifting lever is installed, also use Figure 18 to
remove the Lifting Lever assembly. Then return
to Figure 20 or 21 to continue disassembly.
a. The Lifting Lever Assembly consists of:
1 – Lifting Lever
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1 – Drive Pin
1 – Cam Shaft
1 – Cam Bushing
b. Remove Lifting Lever Assembly by turning
Cam Bushing counterclockwise.
c. Turn Cap (Compression Screw)
counterclockwise.
d. Measure distance from Release Lock Nut
to the top of the Lifting Stem for reassembly
later.
e. Remove the Release Lock Nut and Release
Nut by turning counterclockwise.
4. Measure and record Compression Screw height
for later use when resetting.
5. Turn Compression Screw Lock Nut
counterclockwise to loosen.
6. Turn Compression Screw counterclockwise to
remove the load 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 remove Drive Pin from
Bottom Spring Washer assembly.
10. Remove the four Cap Screws (Top Plate) holding
the Top Plate to the Pilot Base. Remove and
discard the Spring Seal (Main Piston), O-Ring
(Top Plate) and back-up rings (if applicable).
11. Remove Main Piston Assembly from Pilot Base.
12 Main Piston Assembly consists of:
1 – Main Piston
1 – Piston Nose
1 – Piston Retainer Nut
1 – Set Screw
Remove Set Screw. Turn Piston Retainer Nut
counterclockwise to remove. Remove Piston
Nose.
13. Remove Spring Seal (Main Piston) and Backup
Ring (if applicable) and discard.
Consolidated 4900 MPV Series POSRV Manual
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