English Translation of Title:
Lock Washer 38 – waterjet pump Parts – Waterjet Cutting Equipment Accessory (ID: 95688743)

Description, Purpose, Features, and Maintenance:

This component is a split‑type helical lock washer sized for 38‑mm diameter fasteners, manufactured specifically as a replacement part for waterjet pump assemblies. It is installed beneath nuts on high‑pressure pump cylinder heads, valve covers, and plunger retaining bolts to resist loosening from intense reciprocating forces and pressure spikes.

Purpose:

• Maintains consistent clamping force on pump housing bolted joints subjected to cyclic pressure loads up to 6,000 bar.

• Prevents fastener back‑off due to mechanical vibration and hydraulic pulsation inherent in intensifier‑type pumps.

• Compensates for differential thermal expansion between steel fasteners and pump body materials during warm‑up and cool‑down cycles.

• Provides a mechanical locking solution in oil‑wetted pump areas where liquid thread lockers may dissolve or contaminate the hydraulic fluid.

Features:

• Formed from high‑carbon spring steel with a zinc‑plated or passivated finish for corrosion resistance in high‑humidity pump compartments.

• Helical split geometry delivers uniform spring reaction force to sustain preload under dynamic loading.

• Razor‑sharp split ends grip the nut bearing face and the work surface, creating a positive anti‑rotation lock.

• Heat‑treated to maintain elastic memory over extended service life, even after repeated torque cycles.

• Dimensional accuracy ensures proper fit on 38‑mm studs or bolts without causing binding or excessive stress on threads.

Maintenance:

• Inspect visually for cracks, flattening, or reduction in split gap prior to every pump reassembly.

• Replace immediately if the washer shows any signs of stress fracture, corrosion pitting, or loss of spring action (gap fully compressed).

• Clean using a parts washer with non‑petroleum solvent; dry thoroughly before installation to prevent rust entrapment.

• Always install with the split ends facing the nut (away from the stationary base) to ensure proper biting action.

• Do not reuse lock washers that have been subjected to overtightening or have completed more than one service interval, as elastic properties degrade.

• Torque fasteners to the pump manufacturer's specified value; over‑torquing can flatten the washer and eliminate its locking function.