Executive Overview & Core Compatibility
This dedicated HT400 pump parts list features premium OEM-equivalent replacement components exclusively engineered for the HT400 and HT-400TM plunger-style frac pumps — the workhorse high-pressure fluid transfer pumps used in hydraulic fracturing, well servicing, cementing, and high-pressure mud pumping operations across oil and gas drilling sites. Targeted at oilfield maintenance technicians, frac fleet procurement managers, well service crews, and industrial pump repair specialists, this catalog addresses the hyper-specific needs of professionals seeking reliable, pressure-rated, precision-machined parts to eliminate downtime and extend pump service life.
Core Purpose & Value Proposition
The core mission of these HT400 pump parts is to restore and maintain peak performance of HT400/HT-400TM frac pumps, solving the most costly and pervasive industry pain points: premature valve failure, high-pressure fluid leaks, plunger wear, packing seal blowouts, and valve guide misalignment. Manufactured to meet API 6A and API 7K industry standards with ±0.001-inch dimensional tolerances, these parts deliver a 35% longer service life than generic aftermarket alternatives, reduce unplanned pump downtime by up to 42%, and lower total cost of ownership (TCO) by 29% for high-pressure pumping operations. Every component is engineered to match the exact fit, function, and pressure rating of original factory parts, supporting 3.38-inch, 4.0-inch, and 4.5-inch plunger/valve configurations for versatile frac pump servicing.
Product Introduction
This comprehensive HT400 pump parts kit encompasses all critical wear and replacement components for the fluid end and power end of HT400/HT-400TM frac pumps, including suction/discharge valves, valve seats, plungers, packing seals, O-rings, retainers, springs, bushings, and fasteners. Curated for both routine preventive maintenance and emergency field repairs, this catalog serves as a definitive procurement benchmark and technical repair reference, ensuring full compatibility with No.3 and No.4 frac pump valve assemblies, tapered seat bores, and high-pressure fluid passages. All parts use industry-grade materials to withstand abrasive fracturing fluids, high cyclic pressure, and corrosive well service environments.
Functional Specifications
- Valve & Seat Assemblies: Precision-machined valves and tapered seats provide zero-leak shutoff under pressures up to 15,000 psi; valve springs (25 lb/in and 36 lb/in ratings) maintain consistent valve closing force to prevent backflow and pressure loss.
- Plunger & Seal Components: Hard-surface coated plungers resist abrasion from frac fluids; double-lip packing seals and Zurcon UCUP seals deliver superior fluid retention, reducing lubricant loss and leak-related shutdowns.
- Guide & Retainer Parts: Brass valve guide bushings and machined retainers ensure perfect valve alignment, minimizing wear and extending the service life of critical moving components.
- Sealing & Fastening Hardware: 90-durometer O-rings, gaskets, and high-strength fasteners create reliable, pressure-tight connections, while spacer rings and header rings maintain proper assembly clearances under high cyclic loading.
Applicable Operating Conditions
These parts are engineered for extreme high-pressure oilfield conditions, including hydraulic fracturing, well cementing, acidizing, and high-pressure mud pumping. They perform reliably in corrosive fluid environments, high cyclic pressure cycles, continuous 24/7 frac operations, and onshore/offshore well servicing sites. Components are compatible with both stationary and mobile HT400/HT-400TM frac pump skids.
Maintenance & Service Recommendations
- Preventive Maintenance Schedule: Inspect valves, seats, and plungers for wear every 200 operating hours; replace packing seals and O-rings every 500 hours; torque-check retainers and fasteners every 300 hours to prevent loosening from vibration.
- Installation Best Practices: Lubricate seals and plungers with compatible frac pump lubricant during assembly; torque valve retainers to specified values to avoid seal distortion; align valve guides precisely to prevent uneven wear.
- Troubleshooting Tips: Resolve fluid leaks by replacing damaged O-rings or packing seals; fix pressure loss by inspecting valve springs and seat integrity; address plunger wear by replacing worn guide bushings and aligning components.
| NO | Unit | Deskripsi | Manufacture |
| 1 | Pcs | Retainer, Stop and Spring, HT400, No. 3 Suction Valve, Mach. Cast. | EQV |
| 2 | Pcs | Boot, Suction and Stop, HT-400TM, No. 3, 4 and 5 Frac | |
| 3 | Pcs | Spring, Lock, Suction Stop, No. 3, HT400 | |
| 4 | Pcs | Pin, Cotter, 1/8 x 1 1/2 Inch, HT-400TM | |
| 5 | Pcs | Liner, Two Piece Bushing, Valve Guide, HT400, No.4 Frac, Brass | |
| 6 | Pcs | Insert, Two Piece Bushing, Valve Guide, Special, HT-400TM, No 4 Frac | |
| 7 | Pcs | Spring, Valve, HT400, No. 3, 3.38 and 4 Inch, 36 lb/in | |
| 8 | Pcs | Valve, HT400, 3.38, 4.0 In, Frac | |
| 9 | Pcs | Insert, Valve, HT400, Frac, Acid /Frac (Yellow) | |
| 10 | Pcs | Seat Valve, HT400, No. 3 Frac, Tapered | |
| 11 | Pcs | O-ring, 90 Duro, 4 x 3 3/4 x 1/8, 568-240 | |
| 12 | Pcs | Retainer, Guide Bushing, HT400, 3.38, 4.0 Inch, Tapered Seat Bore | |
| 13 | Pcs | Retainer, Cover, HT-400TM, 4.0 in. | |
| 14 | Pcs | Cover, Discharge, Double Guided Valve, HT-400TM, 4.0 and 4.5 in. | |
| 15 | Ea | Gasket, Discharge Valve & Cylinder Head Cover, No. 4, HT-400TM | |
| 16 | Pcs | Ring, Spacer, Discharge Valve & Cylinder Head Cover, No.4, HT-400TM | |
| 17 | Pcs | Retainer, Protective Cylinder Head Cover, 4.0 in | |
| 18 | Pcs | Cover, Protective Cylinder Head, 4.0 in(Crush Cap) | |
| 19 | Ea | Gasket, 3 Discharge Valve & Cylinder Head Cover, 3 3/8 in | |
| 20 | Pcs | Ring, Spacer, #3 Discharge Valve & Cylinder Head Cover, 3 3/8 | |
| 21 | Pcs | Nose, Plunger, HT-400TM, 4.0 in. | |
| 22 | Ea | Seal, Plunger Nose Assembly, HT-400TM, 4.0 | |
| 23 | Pcs | Plunger, 4.0 In., Hard Surface, L-Spacer, HT-400TM | |
| 24 | Pcs | Tie Rod, Plunger, HT-400TM, 3.38, 4.0, 4.5 in | |
| 25 | Ea | Adapter, Pushrod, HT-400TM, 4.0 in, Two Piece Nose | |
| 26 | Pcs | EXPENDABLES | |
| 27 | Pcs | Seal, Packing Lube, 4.000, WS-Seal, | |
| 28 | Pcs | O-Ring, 90 Duro, 5 x 4 3/4 X 1/8 568-248 | |
| 29 | Pcs | Carrier, Seal, 4.000 | |
| 30 | Ea | Adapter, Female, 4.000 | |
| 31 | Ea | Packing, 4.000 | |
| 32 | Pcs | Header Ring, 4.000 | |
| 33 | Pcs | Spacer, 4.000, Fluid End | |
| 34 | Pcs | # 1 Spacer, Inner, Discharge Passage Seal, HT-400TM, 5.75 in. | |
| 35 | Pcs | # 2 Seal, Discharge Passage, HT-400TM, 3.375 O.D. |
| NO | Unit | Deskripsi | Manufacture |
| 1 | Pcs | Retainer, Stop and Spring, HT400, No. 4 Suction Valve, Mach. Cast. | EQV |
| 2 | Pcs | Spring, Lock, Suction Stop, No. 4, HT400 | |
| 3 | Pcs | Spring, Valve, HT400, No. 4, 4.5 Inch, 25 lb/in | |
| 4 | Pcs | Valve, HT400, 4.5 inch, Frac | |
| 5 | Pcs | Insert, Valve, HT400, No. 4 Frac, Urethane, Acid/Frac Service (Yellow) | |
| 6 | Pcs | Seat Valve, HT400, No. 4 Frac, Tapered | |
| 7 | Pcs | O-ring, 90 Duro, 4 1/2 x 4 1/4 x 1/8, 568-244 | |
| 8 | Pcs | Retainer, Guide Bushing, HT400, No. 4, Tapered Seat Bore | |
| 9 | Pcs | Retainer, Protective Cylinder Head Cover, 4.5 in | |
| 10 | Pcs | Cover, Protective Cylinder Head, 4.5 in(Crush Cap) | |
| 11 | Pcs | Nose, Plunger, HT-400TM, 4.5, 5.0, 6.0 in. | |
| 12 | Pcs | Seal, Plunger Nose Assembly, HT-400TM, 4.5 | |
| 13 | Pcs | Plunger, 4.5 In., Hard Surface, L-Spacer, HT-400TM | |
| 14 | Pcs | Seal, Packing Lube, Z20, 4 1/2 x 5 x 9/16 Zurcon UCUP, Double Lip FE | |
| 15 | Pcs | O-Ring, 90 Duro, 5 1/2 x 5 1/4 X 1/8 568-252 | |
| 16 | Pcs | Carrier, Seal, 4.5, HT-400TM, 2004 | |
| 17 | Pcs | Ring, Backup, Packing, HT-400TM 4.5 in, 2004 | |
| 18 | Pcs | Packing Set, 4 1/2x 5 1/2 x 0.50 Stock HT, 3 rings, Hard, Acid Service | |
| 19 | Pcs | Header Ring, 4 1/2 x 5 1/2 Packing, Polyurethane, HT-400TM FE | |
| 20 | Pcs | Adapter, Header Ring, 4 1/2 x 5 1/2, HT-400TM, FE |
On-Site Field Failure Repair Cases
Case 1: Valve Spring Failure & Pressure Loss
A HT400 frac pump experienced severe pressure drop during a fracturing operation, traced to fatigued 36 lb/in valve springs on No.3 suction valves. Replacing the worn springs with OEM-equivalent 36 lb/in springs restored full pressure output, resuming operations within 90 minutes.
Case 2: Plunger Packing Seal Leak
A HT-400TM pump developed a major fluid leak at the 4.0-inch plunger assembly due to a degraded double-lip packing seal. Installing a new Zurcon UCUP packing seal and backup ring eliminated leaks, avoiding a full pump teardown and costly downtime.
Case 3: Valve Guide Bushing Wear
A HT400 pump exhibited uneven valve operation and premature seat wear caused by worn brass valve guide bushings. Replacing the two-piece bushing inserts and realigning the valve assembly restored smooth valve movement, extending valve and seat service life.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts compatible with both HT400 and HT-400TM pumps? | Yes, these parts are precision engineered to fit HT400 and HT-400TM frac pumps, supporting 3.38″, 4.0″, and 4.5″ plunger/valve configurations for full cross-compatibility. |
| What pressure rating do these HT400 pump parts support? | All critical fluid-handling parts are rated for up to 15,000 psi, compliant with API 6A standards for high-pressure hydraulic fracturing and well servicing operations. |
| How do I select the correct valve spring for my HT400 pump? | Choose 36 lb/in springs for No.3 3.38/4.0-inch valves and 25 lb/in springs for No.4 4.5-inch valves, matching your pump’s specific valve assembly size and configuration. |
Procurement Guidance & Closing Call to Action
For oilfield operations relying on HT400/HT-400TM frac pumps to deliver consistent high-pressure performance, this parts list serves as a trusted procurement standard and hands-on technical repair reference. Investing in these OEM-equivalent HT400 pump parts eliminates the risks of inferior aftermarket components — including premature failure, fluid leaks, and costly job delays — while ensuring compliance with strict oilfield safety and performance standards.
Whether you are stocking inventory for routine preventive maintenance, addressing urgent on-site frac pump repairs, or planning a full fluid end overhaul, this curated parts selection provides the durability, precision, and pressure resistance required for harsh oilfield environments. Secure the exact HT400/HT-400TM pump parts you need to keep your frac fleet operational, maximize pump uptime, and protect your equipment investment. Prioritize specification-matched, high-quality components to streamline procurement, simplify field repairs, and maintain reliable high-pressure pumping performance for every well service job.
