Seal-20460216.1475.3-1

Short Description:

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Details

Product Name: Seal (Part No. 20460216)

Description:
This component is a specialized seal for the hydraulic piston assembly in a waterjet intensifier pump. It is listed as a sub-component of the Hydraulic Piston Assembly (P/N 20458869) . The seal (20460216) is part of the rebuild kit for the piston rings (20458821) . The primary function of this seal is to maintain hydraulic fluid integrity within the low-pressure (oil) side of the intensifier, preventing oil from leaking past the piston .

It is designed as a Seal, Rod, Hi-Load type, engineered to work under the high-cycle, high-pressure conditions typical of waterjet operation. Its primary role is to seal the reciprocating piston rod against the hydraulic cylinder bore, converting hydraulic pressure into mechanical force to drive the high-pressure plunger .

Applications:

Rebuilding the Hi-Load hydraulic piston (20457966) in the low-pressure section of waterjet intensifier pumps .
Restoring piston sealing integrity when symptoms of hydraulic bypass (erratic cycling, inability to maintain pressure) appear .
Used during scheduled Major Maintenance, Minor Maintenance, or complete pump overhaul procedures .
Compatible with 60,000-94,000 PSI (approximately 4,137-6,480 bar) waterjet intensifier systems.

Features:

Designed for Hi-Load Pistons: Engineered to work with the advanced sealing stack of the Hi-Load piston design, contributing to extended service life .
High-Performance Material: Manufactured from wear-resistant, high-durometer elastomers or composites to withstand extreme pressure cycling and reciprocating friction .
Critical Seal Component: Classified as a high-wear consumable part. Its condition directly affects the intensifier's ability to generate and hold consistent cutting pressure .
Oil Compatibility: Specifically formulated for resistance to petroleum-based hydraulic fluids and extreme pressure additives.
Direct OEM Replacement: Interchangeable with part number 20460216 as listed in intensifier assembly parts diagrams .

Maintenance:

When to Replace (Failure Diagnosis):

External Hydraulic Leakage: Visible oil weeping from the joint between the End Bell and the Hydraulic Cylinder indicates rod seal failure .
Erratic Intensifier Cycling: The pump may cycle irregularly, "overstroke," or "knock" due to hydraulic oil bypassing the worn piston seals .
Inability to Build Full Pressure: Worn seals allow internal leakage, preventing the system from reaching its rated cutting pressure .
Water Contamination: If the hydraulic oil appears milky or discolored, a seal failure may have allowed water to enter the oil system.
Scheduled Overhaul: Standard practice to replace piston seals during major intensifier overhauls (every 2,000-5,000 hours) to prevent unexpected downtime .

Inspection and Replacement Guidelines:

Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, fully depressurize both the hydraulic system and the high-pressure water circuit, and follow lockout/tagout procedures.
Use Non-Metallic Tools: To avoid scratching the piston rod or cylinder bore, use non-metallic tools when removing old seals .
Clean Area Maintenance: Perform the rebuild in a designated clean area. Thoroughly clean the piston, cylinder bore, and all sealing surfaces with a lint-free cloth.
Inspect the Piston Rod: Carefully examine the reciprocating piston rod (plunger) for scoring, pitting, or diameter reduction. A damaged rod will rapidly destroy the new seal .
Inspect the Cylinder Bore: Check the hydraulic cylinder bore for scratches, burrs, or gouges. A damaged cylinder will cause the new seal to wear out prematurely .
Lubrication: Generously lubricate the new seal and the cylinder bore with clean hydraulic oil or high-pressure grease during reassembly to prevent dry start-up.
Use a Seal Installation Tool: A proper seal installation sleeve should be used to guide the new seal over the piston rod threads to prevent pinching or cutting the sealing lip.
Torque Compliance: When reinstalling the piston assembly and end bells, use a crossing pattern to tighten tie rod nuts to the torque value specified in the equipment service manual (e.g., 160 Nm / 120 ft-lbs) .