Tilt-A-Jet On/Off Valve Rebuild Kit | Max 5 | HJ-303639 -NEW UPGRADED DESIGN
The HJ-303639 On/Off Valve Repair Kit MAXJET (Upgraded Design) is a precision-engineered, high-performance rebuild kit developed to restore and enhance the reliability of OMAX MAXJET cutting heads, including MAXJET 5 Tilt-A-Jet (TAJ) systems.
This new improved, long-lasting HJ-303639 On/Off Valve Repair Kit includes all essential wear components required to rebuild the on/off valve assembly, ensuring consistent cutting performance, precise water control, and extended service life in ultra-high-pressure waterjet systems operating up to 60,000 PSI (60K)
The following is what makes our new enhanced design premium:
🔹 Enhanced Seal Technology
- Uses high-performance sealing materials for improved resistance to pressure, heat, and abrasion
- Reduces premature wear and leakage
🔹 Reinforced Backup Ring Design
- Improved extrusion resistance under extreme 60K PSI pressure
- Extends overall seal life
🔹 Precision-Machined Valve Seat
- Optimized sealing surface for cleaner shutoff and reduced leakage
- Improves valve efficiency and reliability
🔹 Upgraded Poppet / Valve Element
- Enhanced wear resistance for high-cycle operation
- Maintains consistent valve response over time
🔹 Improved Surface Finishing
- Reduced friction between moving parts
- Smoother actuation and faster response
UPGRADED KIT COMPONENTS INCLUDE:
- Enhanced valve seat (precision-machined)
- Upgraded poppet / valve element
- High-performance seals
- Advanced O-rings (multi-material compatibility)
- Reinforced backup rings
- Internal wear components (as required for full rebuild)
Key Benefits
- Longer service life vs standard kits
- Improved resistance to abrasive contamination
- Faster valve response and cleaner shutoff
- Reduced leakage and pressure loss
- Lower maintenance frequency and downtime
- Upgraded High-Durability Design
- Extended Seal and Component Life
- Optimized for 60K PSI Systems
- Improved Valve Response and Shutoff
- Reduced Downtime and Maintenance Costs
Applications
- OMAX abrasive waterjet cutting machines
- OMAX multi-axis bevel cutting heads (TAJ systems)
- MAXJET 5 (TAJ) assemblies
- High-production manufacturing
- Precision cutting (metal, glass, composites)
Frequently Asked Questions | HJ-303639
- What is HJ Waterjet part number HJ-303639?
HJ Waterjet HJ-303639 is a direct replacement for OMAX 303639 On/Off Valve Rebuild Kit for the TILT-A-JET (TAJ) / MAXJET 5 Tilt-A-Jet assembly.
- Where is HJ-303639 used?
It is used in the TILT-A-JET nozzle assemblys On/Off Valve to rebuild worn valve components.
- What cutting head does HJ-303639 fit?
It is associated with the MAXJET 5 Tilt-A-Jet / TILT-A-JET cutting-head assembly.
- Is HJ-303639 a rebuild kit or a replacement valve?
It is a rebuild/repair kit, not a complete replacement valve assembly.
- What components are replaced with the HJ-303639 kit?
Rebuild-kit references identify components associated with the valve such as the stem assembly, valve seat, and seal assembly.
- When should I replace the HJ-303639 rebuild kit?
Typically when the On/Off valve develops leaking, inconsistent shutoff, poor valve operation, or worn internal sealing components. Regular inspection and replacement of worn parts helps prevent additional component damage and downtime.
- What is the difference between HJ-303639 and HJ-301927?
HJ-303639 is for the TILT-A-JET/TAJ On/Off valve, while HJ-301927 is the Integrated On/Off Valve Rebuild Kit for other nozzle assemblies.
- Is HJ-303639 compatible with the OMAX MAXJET 5 Tilt-A-Jet?
Yes. Multiple parts catalogs identify HJ-303639 specifically as the MAXJET 5 Tilt-A-Jet On/Off Valve Repair/Rebuild Kit.
- Can I replace individual valve components instead of the complete HJ-303639 kit?
Yes, individual components such as the HJ-303326 Valve Seat, HJ-303327 Valve Body, HJ-302094 Seal Assembly, and HJ-302668 Stem Assembly are separately identified in the MAXJET 5 Tilt-A-Jet valve component lineup.
- What other parts are commonly replaced with HJ-303639?
Depending on inspection, customers may also replace the On/Off Valve Seat (HJ-303326) , Valve Body (HJ-303327), Stem/Seal Assembly (HJ-302094/HJ-302668), and related O-rings.
- Is HJ-303639 used on the pump?
No. It is a cutting-head/on-off valve rebuild component, not a high-pressure pump maintenance kit.
- Is HJ-303639 the same as the complete On/Off valve assembly?
No. The rebuild kit is intended to service/rebuild the valve. The complete Tilt-A-Jet On/Off valve assembly is a separate component.
- Can HJ-303639 help fix water leaking through the On/Off valve?
It can, when the leakage is caused by worn seals, valve-seat wear, or other serviceable internal valve components. If the valve body or other major components are damaged, additional replacement parts may be required.
Why Choose HJ Waterjet?
HJ Waterjet replacement parts are engineered to deliver premium-quality, reliable performance, precision fit, and long-lasting durability at a competitive price. Precision manufactured to exact specifications using high-quality materials and tight tolerances, our components are designed for compatibility with OEM waterjet systems and demanding industrial applications. By focusing on quality, precision, and value—not expensive branding—we help manufacturers reduce maintenance costs, minimize downtime, and maximize productivity without compromising performance or reliability. When precision matters, HJ Waterjet delivers the quality, reliability, and value professionals trust. Premium Performance Without the Premium Price