Section 9
High Pressure Water System
20412997
8-2012/Rev 12
9-25
Hydraulic Cartridge Seal Installation
Seals in the hydraulic cartridge can be removed and replaced, or the complete cartridge can be
replaced. Seal components differ slightly, depending on the plunger diameter. See Figure 9-18,
Hydraulic Cartridge Seal.
Use caution during the removal and installation of the seal components to avoid scratching the
surface of the cartridge. The seal removal tool, a plastic or wooden dowel, or similar object can
be used for seal removal. Do not use screwdrivers, wires or other metal objects that could
damage the cartridge. To avoid damaging the new seals, the seal installation tool can be used for
installation.
Figure 9-18: Hydraulic Cartridge Seal
7/8” Plunger 1-1/8” Plunger
1. Carefully remove the worn seals and o-rings from the cartridge by pushing them with a
plastic or wooden dowel, or similar object. Remove the seals closest to the open ends
first, and work toward the center.
2. Inspect the seals for unusual wear, deformation or cuts. Note any unusual buildup of solid
material or debris creating possible leak paths.
3. Inspect the surface of the cartridge body for scratches, deformation, signs of metal-to-
metal contact or other unusual wear. Carefully examine the surface of the grooves on the
inside diameter. Note any scratches in the axial direction that could create a leak path.
4. Apply FML-2 grease to the inside and outside diameter of the cartridge body, and to the
individual seal components.
5. Install the seals, starting in the center and working toward the ends. See Figure 9-18 for
the proper orientation of the u-cup seals. If available, use the seal installation tool to
install the u-cup seals. See Figure 9-24, Pneumatic Valve Seal Tools.
6. Verify that the u-cup o-rings are properly positioned after installation.
7. When the seal components are properly installed, apply FML-2 grease to the exposed
surfaces of the seals and slide the hydraulic cartridge seal over the plunger, into the cavity
of the hydraulic cylinder head.
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