© 1996 Manitowoc Engineering Co.
Rev. 06-14-96 Folio 1037-1
AIR SYSTEM FILTER
SERVICE INFORMATION
General
Two styles of air filters are used on Manitowoc cranes: Watts and Balston. This
folio describes maintenance of both filters.
Daily
Maintenance
1. Open the manual drain valve at the end of each shift to drain water and dirt
from the filter.
2. If equipped, check the automatic drain valve periodically during the day for
proper operation.
Monthly
Maintenance
Replace the filter element as follows:
NOTE: It is not necessary to remove the filter head from its mounting to replace
the element.
1. Stop engine and depressurize filter. If a shut-off valve is provided, close the
shut-off valve and open the manual drain valve on the filter to vent the filter.
If a shut-off valve is not provided, open the drain valve on the air tank(s) and
on the filter to vent the air system.
2. Refer to Figure 1 and disassemble the filter.
3. Wash all parts in soap and water and dry.
4. For the Watts filter, wash the element in alcohol and blow it out from the inside
with air. For the Balston filter, discard the element.
5. Inspect all parts for damage and replace as necessary.
6. Refer to Figure 1 and reassemble the filter. Tighten all threaded parts securely.
7. If disconnected, reconnect the air lines to the proper ports of the filter. Use
pipe-thread sealant or tape sparingly and apply only to the male threads.
NOTE: The top of the Watts filter is marked IN and OUT to identify the ports;
connect the line from the tank to the IN port.
The top of the Balston filter has an arrow to identify direction of flow; the
arrow must point away from the air tank.
8. Close all drain valves and open all shut-off valves.
9. Build air system pressure to the normal operating range and check the filter for
leaks.
Automatic Drain
Valve Operation
NOTE: The automatic drain valve is not used on all filter installations.
The automatic drain valve contains a float. When the liquid in the valve body rises
to the level of the float, the float rises to open a needle valve. This action allows the
liquid to drain. Air pressure then reseats the float, and the cycle repeats.
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