Maintenance
Pump Lubrication System
Check the condit ion of the ISO pump lubricant daily.
Change the lubricant if it becomes a gel, its color
darkens, or it becomes diluted with isocyanate.
Gel forma tion 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 see page 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 Pressure Relief Procedure, page 69.
2. Lift the lubricant reservoir (R) out of the bracket
and remove the container from the c ap. Holding
the cap over a suitable container, remove the
check valve a nd allow the lubricant to d rain.
Reattach the check valve to the inl et 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 reservoir onto the c ap assembly and
place it i n the bracket.
6. The lubrication system is ready for operation. No
priming is required.
Pum p Lub rication System
Figure 34
76 332636D
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