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 13.
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 (ST). See FIG. 13.
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.The lubrication system is ready for operation. No priming is required.
Repair
ST
RT
LR
RB | ST | RT | ti18001a |
FIG. 13. Pump Lubrication System
3A1570A | 35 |