Repair
Change Lubricant
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 pu mp lubricatio n 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 Pressure Relief Procedure, page 49.
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.
3. Drain the reservoir a nd flu sh 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 (ST) tube
approximately 1/3 of the w ay into the reservo ir.
7. Push the smaller diameter return tube (RT) into
the reservoir until it reaches the bottom.
NOTE:
The return tube 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 and returned to the pump.
8. The lubrication system is ready for operation. No
priming is required.
Figure 1 Pump Lubrication System
Change Hydraulic Fluid and Filter
Note
Change break-in oil in a new system after
the first 250 hours of operation or within 3
months, whichever comes first.
Table 2 Frequency of Oil Changes
Ambient Temperature Recommended
Frequency
0to90°F
(-17 to 32°C)
1000 hours or 12
months, whic hever
comes first
90°F and above
(32°C and above)
500 hours or 6 months,
whichever comes first
1. Follow Pressure Relief Procedure, page 49.
2. Allow hydraulic fluid to cool
334946A 53
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