Inlet Fluid Strainer Screen; Pump Lubrication System - Graco Reactor H-25 Series Repair And Parts Manual

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.
NOTE: 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. Close the material supply valve at the pump inlet to
prevent material from being pumped while the
strainer plug (59j) is removed.
2. Place a container under the strainer base to catch
drain off when removing the strainer plug.
3. Remove the screen (59g) 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 (59h) and
replace as required.
4. Ensure the pipe plug (59k) is securely screwed into
the strainer plug (59j). Install the strainer plug with
the screen (59g) and gasket (59h) 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.
312063Z
F . 14 Y Strainer Components
IG
* Fluid filter screen (59g) replacements:
Part Description
180199 20 mesh (standard); 1 pack
255082 80 mesh (optional); 2 pack
255083 80 mesh (optional); 10 pack

Pump Lubrication System

Check the condition of the ISO pump lubricant daily.
Change the lubricant if it becomes a gel, its color
darkens, 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
moisture, 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 the pressure. See Pressure Relief
Procedure, page 26.
2. Lift the lubricant reservoir (LR) out of the bracket
(RB) and remove the container from the cap.
Holding the cap over a suitable container, remove
the check valve and allow the lubricant to drain.
Reattach the check valve to the inlet hose. See F
15.
Repair
59g*
59h
59j
59k
ti9886a
.
IG
43