Section 9
High Pressure Water System
20412997
8-2012/Rev 12
9-11
High Pressure Cylinder Assembly Removal
Prior to removing electrical power or any high or low pressure piping, start the machine from the
Maintenance Screen on the control panel. The machine will start in recirculation mode; the dump
valve will open and relieve the high pressure in the system.
Press the right or left arrow to extend the plunger on the end to be serviced. The plunger will
extend in the selected direction, allowing full exposure when the unit is disassembled.
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lockout/Tagout procedures before proceeding.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before proceeding.
2. Disconnect the high and low pressure water piping, following the procedure, High and
Low Pressure Water Piping.
NOTE
Prior to removal, verify that the alignment marks on the high pressure cylinder and
on the hydraulic cylinder head are aligned. If not, check the condition of the
retaining ring and the bushing retainer flange after the cylinder assembly is
removed.
Due to the weight of the cylinder assembly, adequate support must be provided to
prevent damage to the plunger or seals during removal and installation. See Figure
9-7, Specialized Maintenance Tools for tools available to support the high pressure
assembly for this procedure.
3. Position the vee block cradle tool under the cylinder assembly. Unthread and remove the
assembly from the hydraulic cylinder head and plunger. The assembly can be rotated with
the cylinder wrench or by hand.
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