Hypertherm HyPrecision Predictive P-15 Operator's Manual page 112

5 – Preventive maintenance
11. Push the seal housing tightly against the plunger bearing.
12. Turn the high-pressure seal backup so that 1 weep hole is in line with the seal housing weep hole.
13. Put the high-pressure seal backup on the plunger and push it against the seal housing.
14. Make sure that the bottom weep holes are aligned.
15. If the proximity switch was removed for this procedure, reinstall it.
112 HyPrecision Predictive waterjet pump Operator Manual 810120