A-Dec 3420 Operation And Maintenance Instructions - page 19
General Service Information
Parts Inspection
In the troubleshooting sections in this manual
you will find references to the “seal area” as a
location for possible defect, which will allow a
valve to leak. The seal area is comprised of the
seal itself (usually an O-ring), the bore or seat in
the valve body, and the seal groove in the valve
stem or piston.
Defects in any of these areas may result in leak-
age. A careful examination of all sealing parts
and surfaces with a magnifier is essential for
detecting flaws that are too small to see other-
wise.
When servicing components that have rubber
gaskets or diaphragms it is generally advisable
to install new ones when reassembling the
components. If the old gasket or diaphragm is to
be re-used, carefully inspect the item for pin
holes or cracks.
Cleaning Internal Parts
When servicing dental systems, the parts of any
component disassembled should be thoroughly
cleaned and inspected for defects before
reassembly. The lubricant recommended for
these parts is largely impervious to chemical sol-
vents. The most effective cleaner is a hot deter-
gent solution. Any wiping should be done with a
soft, lint free cloth. Flush all parts with clear,
hot water and rinse them in isopropyl alcohol.
Tool and Repair Kits
Included with your Pac I Unit is a Field Repair Kit
(Part No. 45.0439.00). The Pac I Field Unit is
equipped with a tool kit. If you have the Pac I
Institutional and Self-Contained Unit and would
like to order the tool kit, ask your dealer or call
A-dec for the Pac I Institutional or Self-
Contained Unit Tool Kit (Part No. 45.0438.00).
Refer to page 34 for a complete listing of the
items in these kits.
The following items are not necessary but may
be useful for Pac I maintenance and service.
O-ring Tools
These tools allow quick field repair of most A-
dec miniature components. The three tools in
this set fit the four smallest O-ring sizes in A-
dec
equipment. Instructions for the use of the O-ring
tools are included with the set.
Hemostats
Hemostats are useful for temporarily stopping
air or water flow through the tubing while
troubleshooting or repairing the unit.
Valve Test Syringe
The valve test syringe is used to make quick
tests of pilot-operated valves. The valve test
syringe can be used to apply a static pressure of
5 (34.5 kPa) to
75 psi (518 kPa).
10x Magnifier
The 10x magnifier is used to inspect miniature
valve parts for defects.
85.0681.00 Rev J
Page
15
Figure 38. Hemostats (A-dec Part No. 009-008-00)
®
412
Figure 39. Valve Test Syringe (A-dec Part No. 98.0050.00)
V I G
O R
I 0X
Figure 40. 10X Magnifier (A-dec Part No. 009.009.00)
Figure 37. O-ring Tools (A-dec Part No. 009.013.00)
Maintenance
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