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XIX. Reassembly of Pilot Valve (Cont.)
d. Lubricate Main Piston stem and cycle Main Piston
through Spring Seal (Adjuster Top) 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
the Adjuster Top is not tighten properly.
e. Install O-Ring (Adjuster Top) into groove on Adjuster
Top.
f. Install O-Ring (Adjuster Bottom) into groove on
Adjuster Bottom. Install from the opposite end of the
square wrenching flats.
g. 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.
h. Continue to turn Adjuster Assembly clockwise into
Pilot Base until it stops.
i. Turn Adjuster Assembly counterclockwise the number
of flats that was recorded in Disassembly Instructions
(Section XVII.A), step 16.
j. Thread the Adjuster Lock Nut clockwise onto the
Adjuster Assembly hand tight.
k. 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.
2.
The Insert Assembly of the pilot consists of:
1 – Insert Top
1 – Insert Bottom
1 – Spring Seal (Insert)
1 – O-Ring (Insert)
a. Press Spring Seal (Insert) into groove on the Insert
Bottom. Make sure spring is facing upwards.
b. Install Insert Top over Insert Bottom with the spring
seal side going in first.
c. Lightly lubricate O-Ring groove now formed by the
two insert parts. This lubrication is used to hold the
O-Ring in place when it is being inserted into Pilot
Base.
d. Place O-Ring (Insert) into groove.
48 | BHGE
Insert Top
Insert Bottom
O-Ring (Insert)
Figure 35: Insert Assembly
e. Final Insert Assembly is shown in Figure 35.
f. Turn Insert Assembly over and thread into Pilot Base
with T-handle groove wrench (Part #4995401 Figure
58 in Section XXIII). Tighten wrench tight. Make sure
milled slot is facing up.
g. Lubricate Main Piston stem and cycle Main Piston
through Spring Seal (Insert) five times.
3.
Install O-Ring (Top Plate) into groove on top of Pilot Base.
a. Lubricate the Spring Seal (Main Piston) and Top Plate
gland. Install the Spring Seal (Main Piston) into Top
Plate. The spring should be oriented as shown in
Figures 36 or 37.
b. Lubricate Main Piston before installing. Install the
Main Piston into the Top Plate with the Spring Washer
bearing point going in first. Be careful not to damage
the Spring Seal (Main Piston).
4.
Install Main Piston / Top Plate Assembly into Pilot Base
by inserting small diameter end of Main Piston through
Insert Assembly.
Top Plate
Figure 36: Top Plate (39PV07)
© 2019 Baker Hughes, a GE company. All Rights Reserved.
Spring Seal
Spring Seal
(Main Piston)
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