Operating Manual Maintenance
4/1/99
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WARNING:
D
O NOT FILL THE LUBE CYLINDER WITH PUMP LUBE
. T
HIS WOULD OVER
SERVICE THE SYSTEM AND MAY CAUSE THE LUBE RESERVOIR TO BURST
. T
HE SYSTEM IS SELF
-
PRIMING AND THE LUBE CYLINDER WILL FILL DURING NORMAL OPERATION OF THE MACHINE
.
Inlet Strainer Screen
A strainer screen in each proportioning pump filters out solid matter that could adversely
effect the operation of the ball check valves in the pump base. You will note that the
Daily Start-up procedure indicates these screens should be inspected daily.
For the first week or so of operation, you should clean both pump screens on a daily basis.
The Isocyanate component can crystallize from either moisture contamination or from
freezing. Following proper storage, transfer, and operating procedures, and if the
chemicals you receive are clean, you should have little problem with the Isocyanate
screen. In practice though, it is good preventative maintenance to daily clean the
Isocyanate screen. NEVER clean the Isocyanate pump screen during the shutdown
operation. This is because the cleaning of the screen exposes it and its related parts to
moisture and solvent, which can cause the Isocyanate to crystallize. Performing the
cleaning operation during the start-up procedure will minimize contamination problems
because dispensing will immediately flush out any Isocyanate residue.
Removal and cleaning of the strainer screen is accomplished as follows:
1.
Close the material supply valve at the inlet of the appropriate proportioning pump.
This prevents material being pumped when the strainer screw is removed.
2.
Place a container beneath the strainer base to catch the drain-off of chemical when
removing the strainer screw.
NOTE:
More than 25% restriction of the
screen can prevent proper filling
of the pump during operation. If
more than 25% is blocked, the
screen should be replaced
3.
Remove the screen from the strainer
base.
Thoroughly flush the screen with gun
cleaner and shake it dry. Inspect the
screen to insure that no more than 25%
of the mesh is restricted.
Inspect the strainer screw gasket and
replace as required.
Figure 29. Strainer
4.
Install the strainer screw with the strainer in place and tighten. Important: Take care
not to over-tighten, let the gasket make the seal.
5.
Open the material supply valve; insure there are no leaks and wipe the equipment
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