Maintenance
34 312062A
Pump Lubrication System
Check the condition of the ISO pump lubricant daily.
Change the lubricant if it becomes a gel, its color dark-
ens, 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 mois-
ture, 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 pressure, page 28.
2. Lift the lubricant reservoir (LR) out of the bracket
(RB) and remove the container from the cap. Hold-
ing the cap over a suitable container, remove the
check valve and allow the lubricant to drain. Reat-
tach the check valve to the inlet hose. See F
IG. 7.
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 cap assembly and
place it in the bracket.
6. Push the larger diameter supply tube (ST) approxi-
mately 1/3 of the way into the reservoir.
7. Push the smaller diameter return tube (RT) into the
reservoir until it reaches the bottom.
8. The lubrication system is ready for operation. No
priming is required.
Important: The return tube (RT) must reach the
bottom of the reservoir, to ensure that isocyanate
crystals will settle to the bottom and not be
siphoned into the supply tube (ST) and returned to
the pump.
F
IG. 7. Pump Lubrication System
LR
RT
ST
RB
ti9911a
ti9887a
LR
ST
RT
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