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48 312066Z
Inlet Fluid Strainer Screen
The inlet strainer at each proportioning pump filters out
solid matter that can plug the 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.
1. Close the material supply valve at the pump inlet to
prevent material from being pumped while the
strainer plug (C) is removed.
2. Place a container under the strainer base to catch
drain off when removing the strainer plug.
3. Remove the screen (A) from the strainer manifold.
Thoroughly flush the screen with gun cleaner and
shake it dry. Inspect the screen for blockage. No
more than 25% of the mesh should be restricted. If
more than 25% is blocked, replace the screen.
Inspect the strainer gasket (B) and replace as
required.
4. Ensure the pipe plug (D) is securely screwed into
the strainer plug (C). Install the strainer plug with the
screen (A) and gasket (B) in place and tighten. Do
not overtighten. Let the gasket make the seal.
5. Open the material supply valve, ensure that there
are no leaks, and wipe the equipment clean.
6. Proceed with operation.
* Fluid filter screen (59g) replacements:
Pump Lubrication System
Check the condition of the ISO pump lubricant daily.
Change the lubricant if it becomes a gel, its color dark-
ens, or it becomes diluted with isocyanate.
Gel formation is due to moisture absorption by the pump
lubricant. The interval between changes depends on the
environment in which the equipment is operating. The
pump lubrication system minimizes exposure to mois-
ture, but some contamination is still possible.
Lubricant discoloration is due to continual seepage of
small amounts of isocyanate past the pump packings
during operation. If the packings are operating properly,
lubricant replacement due to discoloration should not be
necessary more often than every 3 or 4 weeks.
To change pump lubricant:
1. Relieve pressure, page 23.
2. Lift the lubricant reservoir (LR) out of the bracket
(RB) and remove the container from the cap. Hold-
ing the cap over a suitable container, remove the
inlet check valve and allow the lubricant to drain.
Reattach the inlet check valve to the inlet hose. See
F
IG
. 13.
Clean the A-side screen only during daily startup.
This minimizes moisture contamination by immedi-
ately flushing out any isocyanate residue at the
start of dispensing operations.
F
IG
. 12. Y Strainer Components
Part Description
180199 20 mesh (standard); 1 pack
255082 80 mesh (optional); 2 pack
255083 80 mesh (optional); 10 pack
A*
B
C
D
TI10974a