POLYURETHANE
MACHINERY
CORPORATION
PHDX-2 SERVICE MANUAL
13. MAINTENANCE
13.1
INLET MATERIAL SCREENS
CAUTION!
Make sure the Main Power Switch is OFF and incom-
ing power is locked OFF.
NOTE!
Inspect and clean Inlet Material Screens before Propor-
tioner start-up. They should not be cleaned after the days’ oper-
ation as the Proportioner should be purged (see page 30) immedi-
ately after inspection and cleaning. This is to reduce the risk of
moisture contamination, chemical reaction with the solvent used in
the cleaning operation, and cross-over in the Spray Gun due to air
entrapment.
Inspection of the Inlet Material Screens on a daily basis is no longer necessary as long as the
following conditions are met.
1. Material drums are stored within the recommended material storage temperature range
and drums are not opened prior to installing the Proportioner Material Transfer Pumps.
2. Desiccant air dryers are used to dry replacement air as material is removed from the
drums to the Proportioner.
3. Consolidation of old material into a common drum for use is minimized, especially the
Iso (A).
If the above conditions are met, inspection of the Inlet Material Screens may be done on a
bi-weekly
basis. Instructions for a proper inspection are listed below.
1. CLOSE the Poly (R) Proportioner Inlet Valve.
2. Place a suitable container under the Material Inlet Strainer to collect the residual
material. Carefully loosen the Strainer Plug to drain material into the container.
3. Completely unscrew the Strainer Plug.
4. Remove the Seal, Spring and Screen and clean them with a suitable solvent. Dry the
parts and ensure the Screen is not obstructed. Replace the Screen if more than 20%
of the Screen surface is obstructed by residue.
REVISION 1.1
53
