Pump Lubrication System
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 pump lubrica- tion 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 4 weeks.
To change pump lubricant:
1.Relieve pressure, page 39.
2.Lift the lubricant reservoir (LR) out of the bracket (RB) and remove the container from the cap. Holding the cap over a suit- able container, remove the check valve and allow the lubricant to drain. Reattach the check valve to the inlet hose. See FIG. 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) approximately 1/3 of the way into the reser- voir.
7.Push the smaller diameter return tube (RT) into the reservoir until it reaches the bot- tom.
Maintenance
Important: The return tube (RT) must reach the bottom of the reservoir, to ensure that isocyanate crystals will set- tle to the bottom and not be siphoned into the supply tube (ST) and returned to the pump.
8.The lubrication system is ready for opera- tion. No priming is required.
ST
RT
RB
LR
ti9911a
ST
RT
LR
ti9887a
FIG. 7. Pump Lubrication System
46 | 312062W |