Maintenance
Pump Lubrication System
Check the condition of the ISO pump lubricant daily.
Change the lubricant if it becomes a gel, itscolor
darkens, or it becomes diluted with isocyanate.
Gel formation is due to moisture absorptionby the
pump lubricant. The in terval between changes
depends on the environmentin which the equipment
is operating. The pump lubrication system minimizes
exposure to moisture, but some contaminationis still
possible.
Lubricantdiscoloration is due to continual seepage of
small amounts of isocyanatepast the pump packings
during operation. If the pack ings are operating
properly, lubricant replacementdue to discoloration
should not be necessary more oftenthan every 3 or
4weeks.
To change pump lubricant:
1. Follow Pressure Relief Procedure, page 64.
2. Lift the lubricant reservoir (R) out of the bracket
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 theinlet hose.
3. Drain the reservoir and flush it with clean
lubricant.
4. When the reservoir is flushed clean, fill with fresh
lubricant.
5. Thread the reservoironto the cap assembly and
place it in the bracket.
6. The lubricationsystem is ready for operation. No
priming is required.

R

Pump Lubrication System
Figure 39
68 3A1705J