310543 11
Service
AMV Reassembly (C02021, C02022, and
C02025)
This procedure describes how to reassemble the
automatic metering valve. Refer to Parts information
on page 15 while performing the procedure to re-
assemble the AMV.
The AMV reassembly procedure is the same for
C02021, C02022, and C02025.
NOTES:
The numbers in parentheses in the text refer to
reference numbers in the parts drawings and parts
lists.
The numbers in parentheses in the text refer to
reference numbers in the parts drawings and parts
lists.
Repair Kit C02023 is available. For the best re-
sults, use all the new parts in the kit when repairing
the AMV. Parts included in the kit are marked with
one asterisk, for example (3*).
Clean all the parts thoroughly before reassembling
the AMV. Check them carefully for damage or
wear, replacing parts as needed.
Prior to installation, lubricate all seals and o-rings with
PARKER-O-LUBE or an equivalent lubricant. Check
with the material supplier for a compatible lubricant.
To reassemble the AMV, perform the following proce-
dure:
1. Install the o-rings (8*, 15*, and 20*) and the back-
up ring (14*) on the base of the needle valve (7).
Stand the body (18) on the retainer end. Press the
fluid piston in the body using a dowel.
2. Reassemble the needle valve (7) and air piston
(13) as follows:
a. Attach the needle chuck to the needle valve
(7) and insert the needle valve through the
fluid piston, threaded end first.
b. Install the quad ring (4*) on the air piston (13)
by carefully stretching the quad ring (4*) into
the groove in the piston (13).
3. Install the spring (6) and then air piston (13) into
the body (18).
4. Press the piston firmly into the body so the threads
appear. Install the o–ring (5*), washer (2), and nut
(1).
5. Install the o–ring (3*) into the groove inside the air
cap (12), and reinstall the cap onto the body (18).
Remove the needle chuck.
6. Install o–ring (8*) and reassemble the retainer (19)
as follows:
a. Place the retainer (19) on a flat surface with
the treaded end down. Press the seal into the
cavity using a 1/4 in (6 mm) dowel. Install the
o–ring (10*) and support washer (17).
b. Install the snap ring (16*) with a snap ring
compression tool.
7. Thread the retainer (19) into the body.
8. Turn the nut (11) clockwise to install and lock the
retainer (19)
9. Reinstall the stop screw (9).
10. Reinstall the nozzle in the retainer (19).
11. Reinstall the AMV back on its mounting fixture.
12. Reconnect the air and fluid hoses.
13. Turn on the air pressure and apply power to the
fluid supply system.
14. Return the AMV to normal operating condition.
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