10 310543
Service
AMV Disassembly (C02021, C02022, and
C02025)
This procedure describes how to disassemble the
automatic metering valve. Refer to Parts information
on page 15 while performing the procedure to disas-
semble the AMV.
The AMV disassembly procedure is the same for
C02021, C02022, and C02025.
NOTE: The numbers in parentheses in the text refer to
reference numbers in the parts drawings and parts
lists.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
To disassemble the AMV, perform the following proce-
dure:
1. Flush the metering valve if possible. Relieve the
pressure.
2. Disconnect the air and fluid hoses. Remove the
metering valve from its mounting.
3. Remove the nozzle from the retainer (19). Clean
and inspect the nozzle.
4. Remove the stop screw (9).
5. Turn the nut (11) counterclockwise to unlcok and
remove the retainer (19) and disassemble the
retainer as follows:
a. Remove the snap ring (16*) with a snap ring
compression tool.
b. Place the retainer (19) on a flat surface with
the threaded end up and press the seal with a
1/4 in. (6 mm) dowel to remove the support
washer (17), o-ring (10*), and seal from the
cavity.
6. Install the needle chuck onto needle valve (7)
through the retainer end of the body (18).
7. Remove the air cap (12) from the valve body (18).
8. Remove the o–rings (3*) from the groove in the air
cap (12).
9. Holding the needle chuck, remove the nylon nut
(1), washer (2), and packing (5*).
10. Remove the air piston (13) from the body and
carefully remove the quad ring (4*) by stretching it
from the groove in the piston.
11. Remove the needle valve (7) from the valve body
(18).
12. Stand the body (18) on the retainer end and press
the fluid piston from the body using a dowel.
Remove the o–rings (8*, 15*, and 20*) and the
back–up ring (14*) from the piston.
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