XIX. Reassembly of Pilot Valve (Contd.)
D. Assembly of 39MV22/72
Making the Main Pilot.
1. Making the Main Piston Assembly
a. Insert the Piston Nose into the recess at the
threaded end of the Piston Top.
b. Slide the Piston Nut over the Piston Nose
and thread it onto the Piston Top. Place the
assembly in a vice with soft jaws and torque the
Piston Nut to 30 ± 3 ft-lbs (40.6±4 N-m).
c. Install the Set Screw into the threaded hole of
the Piston Nut and hand tighten.
2. Making the Adjuster Assembly,
This assembly consists of:
1 – Adjuster Bottom
1 – Adjuster Top
1 – Vent Seal Adaptor
1 – Spring Seal (Adjuster Top)
1 – Spring Seal (Adjuster Bottom)
1 – O-Ring (Adjuster Top)
1 – O-Ring (Adjuster Bottom)
a. Check the Adjuster Top for burrs at the spring
seal lead in chamfer. Remove any burrs using
a polishing cloth.
b. Install Spring Seal (Adjuster Top) into Adjuster
Top using insertion tool as shown in Figure 80.
i. Lubricate Spring Seal (Adjuster Top) with
silicone grease.
ii. Install Spring Seal (Adjuster Top) onto
Plunger Cylinder with spring facing away
from Plunger Cylinder.
iii. Insert Plunger into Plunger Cylinder until
Plunger lightly contacts Spring Seal (Adjuster
Top).
iv. Insert Funnel Tube, chamfer side first, over
the Plunger and Spring Seal (Adjuster Top).
Stop when Spring Seal (Adjuster Top) is
about half way inside the Funnel Tube as
shown in Figure 46.
v. Remove Plunger.
vi. Insert Funnel Tube Assembly into Adjuster
Top until Funnel Tube contacts Spring Seal
(Adjuster Top) gland.
vii. Push down on Plunger cylinder to insert
Spring Seal (Adjuster Top) into Adjuster Top
as shown in Figure 47.
viii. Remove Funnel Tube Assembly.
ix. Inspect Adjuster Top to make sure that Spring
Seal (Adjuster Top) did not flare out during
installation and that the Spring Seal (Adjuster
Top) is oriented as shown in Figure 48.
c. Install the Spring Seal (Adjuster Bottom) onto
the Adjuster Bottom with spring side down as
shown in Figure 48.
d. Place the Vent Seal Adaptor onto the Spring Seal
(Adjuster Bottom) with flat side up.
e. Thread Adjuster Top clockwise onto Adjuster
bottom and torque to 27±2 ft-lbs (37± 2.7 N-m).
f. Lubricate Main Piston stem and cycle Main
Piston through Spring Seal (Adjuster Top) and
Spring Seal (Vent Seal Adaptor) five times.
Note: Do not install adjuster assembly into Pilot
Base with O-Rings installed without wrench
tightening Adjuster Top to Adjuster Bottom
together. Adjuster Top can get stuck in Pilot Base
if Adjuster Top is not tightened properly.
g. Install O-Ring (Adjuster Top) into groove on
Adjuster Top.
h. Install O-Ring (Adjuster Bottom) into groove on
Adjuster Bottom. Install from the opposite end
of the square.
i. Lightly lubricate both external O-Rings on
Adjuster Assembly. Install Adjuster Assembly
into Pilot Base with the Adjuster Top going in
first. Rotate the assembly clockwise during
installation until the threads are engaged. This
helps the O-Rings get by chamfers and holes.
j. Continue to turn Adjuster Assembly clockwise
into Pilot Base until it stops.
k. Turn Adjuster Assembly counterclockwise the
number of flats that was recorded in Disassembly
Instructions (Section XVII.C), step 16.
l. Thread the Adjuster Lock Nut clockwise onto the
Adjuster Assembly hand tight.
m. Thread Adjuster Cap clockwise onto Adjuster
Assembly hand tight.
Note: Make sure Adjuster Cap and Adjuster Lock Nut
threads freely on Adjuster Bottom. Adjuster
Assembly may be inadvertently rotated if these
two parts do not fit loosely.
3. The Insert Assembly of the pilot consists of:
1 – Insert Top
1 – Insert Bottom
1 – Spring Seal (Insert)
1 – O-Ring (Insert)
66 | BHGE
© 2018 Baker Hughes, a GE company. All Rights Reserved.
