Instruction Manual

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IOM-P74

6. Insert smallest o.d. of piston (5) into largest i.d.

of sleeve (3). Press tighly together for metal to

metal contact. Press this assembly into body

(1).

7. To re-attach body assembly to upper & lower

case assembly, position body (1) on bonnet (2)

and rotate body (CW) to secure tight metal to

metal seal. NOTE: Align post (42) with recees

in piston (5).

F. Trim Inspection & Replacement: (All designs)

1. Remove pin (10) and bafﬂ e plate assembly (7)

(8)(9). NOTE: spring pin (9) is pressed into

bafﬂ e plate (7) ﬂ ush to top surface. Pitot (8) is

threaded tight into bottom side of bafﬂ e plate

(7).

2. With body securely clamped in vise remove

seat (11) turning (CCW). Remove and replace

o-ring (27). At re-assembly, tighten seat (11)

metal to metal into body (1).

3. Remove body from vise and rotate end to end

180 degrees to reclamp body in vise with body

cap (16) upwards.

4. Turn body cap (CCW) to remove and replace

o-ring (17). At re-assembly tighten body cap

(16) metal to metal to body (1).

5. With a pick type tool, locate leading edge of

spiral retaining ring (21) in the body cap (16)

and lift upwards slightly. Grab the elevated

end with needle-nose pliers and rotate (CCW)

to remove. At re-assembly replace with new

retaining ring (21).

6. Remove retainer (20). Remove and replace

o-ring (19) and backup ring (18).

7. Grasp end of plug (12) and pull upwards to

remove. Slide return spring (15) off of plug

(12).

8. Secure plug (12) in a vise with vent screw (14)

directed upwards. Turn vent screw (CCW) to

remove and replace seat disc ((13). NOTE:

chamfer on seat disc (13) faces away from the

plug. At re-assembly tighten vented screw (14)

into plug per following torque values:

For Cv Size Torque to in/oz.

0.8 65

2.0 96

D. Piston Replacement - Dome Loaded Design:

1. Securely install the body (1) in a vise with the

loading dome (2) directed upwards.

2. Remove dome (2) by grasping the ﬂ ats and

turning (CCW).

3. Grab piston (5), lift up to remove piston & sleeve

(3) from body (1). Remove and replace o-rings

(4 & 41).

4. With thumb, press down on top of piston (5) to

separate piston from sleeve (3). Remove and

replace o-ring (6).

5. Insert smallest o.d. of piston (5) into largest i.d.

of sleeve (3). Press tighly together for metal to

metal contact. Press this assembly into body.

6. Place dome (2) on body- turning (CW) to secure

body (1) and dome (2) ﬁ rmly together.

7. Refer to Section IV for start up.

E. Piston Replacement - Ratio Loaded Design:

1. Securely install the upper & lower case assem-

bly (43) (44) in a vise with the body(1) directed

upwards.

2. Remove body (1) from upper & lower case as-

sembly (43)(44) and bonnet (2) by grasping the

ﬂ ats on the body (1) and turning CCW. NOTE: It

is not necessary to dis-assemble upper & lower

case assembly. Do not remove post (42) from

upper & lower case assembly to maintain align-

ment of post (42) with pressure plate (46).

3. Rotate body assembly end to end 180 degrees

and securely install in a vise with piston (5)

upwards.

4. Grab piston (5), lift up to remove piston & sleeve

(3) from body (1). Remove and replace o-ring

(4).

5. With thumb, press down on top of piston (5) to

separate piston from sleeve (3). Remove and

replace o-ring (6).

For DOME or RATIO Loaded remove all loading pres-

sure. Fail ure to so may result in ﬂ ying parts that could

cause personal injury.

WARNING 3