OPG1™ Operation and Maintenance Manual
©2000
DH Instruments, Inc
.
Page
32
4.5
CLEANING/REPLACING DRIVE AIR FILTER ELEMENTS
There are filters on the OPG1 drive air inlet ports, one on the
PDVV DRIVE port
and the other on the
DRIVE port
. If the drive air supplied is excessively dirty, the filters may become contaminated and
restrict air flow to the PDVV and/or hydropneumatic pump (see Section 3.1, Figure 6).
The drive air filters are filter bodies with scintered elements. To clean or replace the drive air filters,
the filter body must be removed from OPG1.
To remove and reinstall the drive air filters
, proceed as follows:
Close the OPG1 tank cover fully and plug all hydraulic ports. Ensure that tank is filled to just
under oil return tube.
Place the OPG1 back down on the bench, so that the front panel is up with the open bottom
towards you.
Disconnect the filter connection fittings (2, 4) for the
PDVV DRIVE
filter (3) and (8, 10) for
DRIVE
filter (9). Remove the filter (3) and/or (9).
To reinstall the filter, make the filter connections (2) and (4) or (8) and (10). Take care to insure
that the filter is oriented in the correct direction (determined by the arrow on the filter body).
The two filters are identical.
Connect recommended pressures (see Section 2.3.1.2, Table 2) to the
PDVV DRIVE
port and
DRIVE
port. Check new connections for leaks using a liquid leak detector. Correct leaks,
if present.
The filters may be replaced completely, cleaned by back flushing or disassembled and the filter
element cleaned or replaced.
To disassemble the filter body, open the body by unscrewing the filter body cap CCW. Once the filter
body cap is removed, the scintered filter element can be removed.
1. PDVV DRIVE Port
5. Cap
9. DRIVE Filter
2. PDVV DRIVE Filter Upstream
6. PFA PDVV Supply Tube
10. DRIVE Filter Upstream
Connection
7. DRIVE Tee PDVV Connection
Connection
3. PDVV DRIVE Filter
8. DRIVE Filter Downstream
11. DRIVE Port
4. PDVV DRIVE Filter Downstream
Connection
Connection
Figure 11.
Drive Air Filters