Preventive maintenance
DynaMAX 550P/560P/575P Waterjet Pump Operator Manual 811390 109
6. Put the indicator pin cap into the hydraulic end cap.
7. Put antiseize bolt lubricant on the cap screws.
8. Put the lock washers on the cap screws. Torque the cap screws to 11 N∙m (8 lbf∙ft). Refer to
Indicator pin cap screw on page 180
Install the seal housing assembly and the plunger bearing
Parts, tools, and materials
Replace the plunger bearings:
• every 3,000 hours
• when replacing the high-pressure cylinder
Replace the seal housing assemblies every 6,000 hours.
CAUTION
Water can enter the hydraulic system if the weep holes in the dynamic seal backup or
the seal housing are blocked. Make sure that there is no debris in the weep holes.
1 High-pressure seal backup (bronze)
2 Seal housing
3 Hydraulic rod seal, 1 inch
4 Plunger bearing
DynaMAX premium high-pressure seal repair kit
Plunger bearing
Seal housing
Petroleum-based O-ring lubricant, 56 g (2 oz.)
Antiwear (AW) mineral oil or synthetic hydraulic
fluid, ISO viscosity grade (VG) 32 or 46
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