Repair
Change Pump Lu
bricant
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 formatio
n is due to moisture absorption by the
pump lubrica
nt. The interval between changes
depends on th
e environment in which the equipment
is operatin
g. 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
4weeks.
To change pump lubricant:
1. Follow Pr
essure Relief Procedure, page 49.
2. Lift the
lubricant reservoir (R) out of the bracket
and remo
ve the container from the cap. Holding
the cap o
ver a suitable container, remove the
check va
lve and allow the lubricant to drain.
Reattac
h the check valve to the inlet hose.
3. Drain t
he reservoir and flush it with clean
lubric
ant.
4. When th
e reservoir is flushed clean, fill with fresh
lubric
ant.
5. Thread the reservoir onto the cap assembly and
place it in the bracket.
6. Manually prime the ISO pump. Plug the small
vent hole (H) between the tube grommets while
squeezing the bottle to force the lubricant up the
feed tube. Repeat until the fluid level reaches the
ISOpumptoforcetheairout.
7. Verify that the ISO pump is operating correctly
by feeling the pulsation in the return tube during
normal proportioner pump operation.
8. Ensure the vent hole stays open.
54 333024N
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