PVA 112-2190, Operation Manual, Page: 18 / 34

FCS300 Series Manual
Revision D /
June 2020
Page 18 of 34
Assembly Instructions
General
•
All o-rings must be lubricated with a small amount of silicone grease.
•
A small amount of removable thread locker should be applied to the set screw
(9){9}[11]<10>.
•
Assemble the air section and fluid section separately prior to connecting the
assemblies.
Air Section
1. Mount one 007 Buna o-ring (19){20}[20]<19> on the end (F) of the micrometer
(5){5}[7]<6> and slide it up to the threads.
2. Thread the micrometer into the upper air body (2){2}[2]<4> hand tight.
3. Holding the collar (E) of the micrometer turn the dial (C) counterclockwise until “5”
can be seen on the midsection (D).
4. Using soft tip pliers grab the midsection (D) section of the micrometer and turn
clockwise to snug it onto the upper air body.
5. Use a 1/16” Allen key to assemble the set screw (9){9}[11]<10> into the upper air body
securing the micrometer in place.
6. Mount one 014 Buna o-ring (20){21}[22]<20> on the end of the upper air body.
7. Drop the needle into the piston (13){13}[15]<14> and assemble with the set screw
using an adjustable wrench and 5/64” Allen key to tighten.
8. Mount the 014 Buna o-ring onto the piston.
9. Apply a small amount of silicone grease to the inside of the lower air body
(12){12}[14]<13> then drop in the piston and needle assembly.
10. Mount the 004 Buna o-ring (18){19}[19]<18> on the end of the needle and slide it
down into the groove in the end of the lower air body.
11. Slide the end cap (11){11}[13]<12> onto the needle up to the lower air body, place the
spring (10){10}[11]<11> on top of the piston, and assemble the two air bodies using
two machine screws (8){8}[9]<9> tightening with a 3/32” Allen key.
Note: Be sure the air holes are lined up on the same face and will align with the air
hole on the fluid section (3){3}[3]<5>.