Yoursme Seal Kit for CAT 66DX/6DX Pump — Fits 66DX30/35/40 Models, NBR Seals

The Yoursme 34262 Seal Kit is a complete replacement seal set designed to restore pressure and stop leaks on CAT 66DX and 6DX series pressure washer pumps.

If your CAT Pump is losing pressure or showing signs of oil or water leakage, replacing worn internal seals is the fastest way to recover pump performance without buying a new head assembly. The Yoursme 34262 Seal Kit contains the matched sealing components used in CAT Pump models such as 66DX30G1I, 66DX35G1I, 66DX40G1I and the 6DX35G1I/6DX40G1I variants. Each part is made to meet or exceed OEM form and fit so you can reinstall with confidence and return the pump to near-factory operation.

How will this seal kit fix a leaking or low-pressure CAT Pump?

Worn plunger seals, O-rings, and packing allow fluid bypass and reduce output pressure. Replacing the entire seal stack addresses all internal sealing interfaces at once so the pump can build and hold rated pressure again. The kit replaces both dynamic and static seals that commonly deteriorate from age, heat, and contaminants.

• Restores sealing surfaces: plunger retainers, V-packing, LPS spring seals.
• Eliminates bypass paths that cause low pressure and oil/water leaks.
• Prevents further damage by removing degraded elastomers that harden or crack.

What parts are included and why are they important?

The kit groups the small but critical components that wear during normal operation. Installing the complete set ensures compatible hardness and geometry between mating parts so the pump functions as intended. This avoids mismatched parts that can cause premature failure or persistent leaks.

• 3x Plunger retainer washer seals (90D) to support the plungers under pressure.
• 3x LPS spring seals for the moving plunger sealing surface and spring return.
• 3x Seal case O-rings (70D) for static sealing at the seal housing interfaces.
• 3x V-packing elements and 3x male adapters to rebuild the packing stack.

What materials and durability can I expect from the Yoursme seals?

The replacement components are molded from NBR (Nitrile Buna-N), an industry-standard elastomer known for oil and solvent resistance and mechanical durability. NBR retains flexibility and sealing force across a wide temperature range, helping the kit resist oxidation, abrasion and UV exposure during outdoor use.

• NBR construction resists oils, fuels, and common cleaning solvents.
• Rated for continuous service at elevated temperatures up to about 160°F (71°C).
• Hardness grades selected to match OEM sealing performance and longevity.

How easy is installation and what should I prepare?

If you are familiar with disassembling pump heads, the kit installs using standard hand tools and bench techniques. Clean the pump housing, inspect plungers and ceramic inserts for scoring, and replace any damaged components before reassembly. Follow torque specs and lubrication recommendations from the pump manual for best results.

• Recommended tools: socket set, seal pick, assembly lube, torque wrench.
• Inspect plungers/ceramic rods; replace if scored or out of round.
• Work on a clean bench to avoid introducing debris into the pump.

Who this is for: The Yoursme 34262 Seal Kit is ideal for owners, service technicians, and maintenance shops that service CAT Pump 66DX and 6DX series pressure washers and want a cost-effective repair option. If your pump shows reduced pressure, visible leaks, or is due for preventive maintenance, this kit provides the matched seals and hardware to rebuild three plungers and return reliable performance. The product includes a 12-month support warranty from Yoursme for buyer confidence—contact support with any fitment questions before installation.