Section 8
High Pressure Water System
20479291
2-2012/Rev 04
8-18
Do not stand the cylinder assembly on the top pan of the machine. The assembly
is heavy and must be properly supported to prevent it from falling.
6. Fill the cylinder with water and slide the seal removal tool or a used plunger into the
bronze packing follower to ensure a good seal for the removal of the seal assembly.
7. Place a shop towel around the plunger or seal removal tool to avoid splash back. Use a
dead blow hammer to drive the removal tool or plunger into the cylinder until the seal
components move up and out of the cylinder.
8. Remove the cylinder liner from the bore and inspect for possible heat or wear damage, or
for debris. If cracks or brittleness are detected on the tabs on the ends of the liner, the
liner must be replaced.
9. Feel approximately one inch into the cylinder bore for obvious ridges or grooves. If seal
debris is present, follow the procedure, High Pressure Cylinder Maintenance.
10. Inspect the plunger surface for flaws. Rotate the plunger 360 degrees by hand while
viewing light reflection on the surface to detect any dullness, streaks, pits or other defects.
Run a fingernail perpendicular to the direction of the suspected flaws to determine the
severity of defects. Depending on the seal life achieved with the removed seal assembly,
make a judgment regarding plunger and/or cylinder replacement. If seal debris is present
on the plunger, polish with 600-grit wet/dry sandpaper, using a radial motion.
11. Lightly coat the new seal components with FML-2 grease and install the new components
on the plunger. Ensure the proper orientation of the backup rings as illustrated in Figure
8-13, High Pressure Seal Assembly.
12. Slide the cylinder liner over the plunger.
13. Install the high pressure cylinder assembly into the hydraulic cylinder head, following the
procedure, High Pressure Cylinder Assembly Installation.
14. Reconnect the high and low pressure water piping and turn the low pressure water supply
on.
8.10 Hydraulic Cartridge Seal and Plunger Removal
The following procedure is used to remove the hydraulic cartridge seal and the plunger.
Prior to removing electrical power or any high or low pressure piping, start the machine and
extend the plunger on the end to be serviced to allow full exposure when the unit is disassembled.
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
To Next Page
Loading...
Need help?
General
