Repair
22 3A8501A
Repair
Before Beginning Repair
1. Flush if necessary. Follow Flush the Equipment on
page 21.
2. Follow Shutdown on page 20.
Flush Inlet Strainer Screen
The inlet strainers filter out particles that can plug the
pump inlet check valves. Inspect the screens daily as
part of the startup routine and clean as required.
Isocyanate can crystallize from moisture contamination
or from freezing. If the chemicals used are clean and
proper storage, transfer, and operating procedures are
followed, there should be minimal contamination of the
A-side screen.
Clean the A-side screen only during daily startup. This
minimizes moisture contamination by immediately
flushing out any isocyanate residue at the start of
dispensing operations.
1. Follow the Pressure Relief Procedure on page 19.
2. Close the fluid inlet valve (XA) at the pump inlet and
shut off the appropriate feed pump. This prevents
material from being pumped while cleaning the
screen.
3. Place a container under the strainer base to catch
fluid when removing the strainer drain plug (ZB).
4. After fluid has drained, remove inlet cap (ZC) and
inlet strainer screen (ZA) from the strainer manifold.
Thoroughly flush the screen with compatible
solvent and shake it dry. Inspect the screen. No
more than 25% of the mesh should be restricted. If
more than 25% of the mesh is blocked, replace the
screen. Inspect the gasket and replace as required.
5. Install the strainer plug (ZB) with the screen (ZA).
6. Open the fluid inlet valve (XA), then ensure that
there are no leaks, and wipe the equipment clean.
Proceed with operation.
Repairing this equipment requires access to parts
that may cause electric shock or other serious injury
if work is not performed properly. Be sure to shut off
all power to equipment before repairing.
NOTICE
Proper system setup, startup, and shutdown
procedures are critical to electrical equipment
reliability. The following procedures ensure steady
voltage. Failure to follow these procedures will cause
voltage fluctuations that can damage electrical
equipment and void the warranty.
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