Product Introduction
Our Gardner Denver PZ-7 power end assembly parts are premium OEM-equivalent components built to handle the extreme torsional loads and vibration of heavy-duty drilling, covering every critical element of the pump’s power end system. The lineup includes complete jackshaft assemblies, precision eccentric gears, heavy-duty connecting rods, crosshead and pin components, high-load roller bearings, precision shims, and leak-proof oil sealing hardware. Crafted from forged alloy steel, hardened precision bearings, and oil-resistant elastomers, all parts meet strict API 7K standards, ensuring reliable torque transfer, minimal friction, and long-lasting performance in harsh field conditions.
Functional Specifications
- High-Efficiency Torque Transmission: Precision-machined eccentric and jackshaft assemblies transfer engine torque to the fluid end with less than 2% energy loss, sustaining consistent pumping power at 5000 PSI.
- Heavy-Duty Load Bearing Capacity: Premium roller bearings support radial and axial loads up to 120,000 lbs, resisting premature failure under continuous cyclic loading.
- Leak-Free Lubrication Sealing: High-performance oil seals and gasket sets prevent lubricant leakage, maintaining proper oil levels and protecting critical moving parts from dry running.
- Precision Alignment Control: Graded thickness shims (.002”, .005”, .007”, .020”) enable precise bearing and eccentric alignment, reducing wear and extending component lifespan.
- Vibration-Resistant Fastening: High-tensile screws and locknuts maintain tight assembly under extreme rig vibration, preventing loosening and misalignment.
Structural Characteristics
These PZ-7 power end components feature a heavy-duty, load-optimized structural design: forged steel jackshafts and eccentric assemblies for maximum torsional strength, reinforced connecting rods with precision-bored bearing seats, hardened crosshead pins for wear resistance, and modular bearing retainer plates for secure component positioning. The modular design allows individual replacement of worn bearings, seals, or fasteners instead of full power end overhauls, reducing material waste and repair costs significantly.
Applicable Operating Conditions
These components are engineered to perform reliably in the most demanding drilling environments: onshore deep-well oil/gas exploration, offshore platform well servicing, directional drilling, geothermal drilling, and remote land rig operations. They tolerate extreme temperature fluctuations (-20°F to 220°F), high-vibration rig conditions, continuous cyclic loading, and prolonged exposure to dust and debris, making them suitable for harsh onshore and offshore drilling installations alike.
Maintenance & Servicing Recommendations
To maximize component lifespan and prevent power end failures, follow these industry-approved maintenance protocols: inspect all roller bearings and oil seals every 300 operating hours for wear, pitting, or leakage, replacing damaged parts immediately; re-torque all connecting rod bolts and retainer screws to OEM-specified values every 450 hours to prevent loosening; adjust shim packs every 600 operating hours to maintain proper bearing alignment; change power end lubricating oil and clean oil baffles every 750 hours; inspect crosshead pins and retaining plates quarterly for wear; and lubricate all moving components with API-approved lubricant to reduce friction and heat buildup.
- We supply the following spare parts:
| Power End Assembly | ||
| 1 | JACKSHAFT | 200PZG371 |
| 2 | KEY JACKSHAFT | 200PZG062 |
| 3 | SPACER, Jackshaft Bearing | 200PZG600 |
| 4 | SLEEVE WEAR | 80M7 |
| 5 | GASKET, Bearing Housing to Frame | 25C2619 |
| 6 | HOUSING BEARING | 201PZG006 |
| 7 | BEARING ROLLER, Jackshaft | 12W75 |
| 8 | GASKET, Retainer Plate to Bearing Housing | 25C2620 |
| 9 | PLATE, Bearing Retainer | 200PZG253 |
| 10 | SCREW, Bearing Housing | 75A14 |
| 11 | SEAL OIL | 60DD39 |
| 12 | ECCENTRIC | 200PZG255 |
| 13 | GEAR DRIVEN | 200PZG280 |
| 14 | SCREW, Gear to Eccentric | 655EG12D |
| 15 | WIRE | 97A29 |
| 16 | BEARING ROLLER, Eccentric | 12BA20 |
| 17 | SHIM (.002″) | 200PZG732 |
| 18 | SHIM (.005″) | 201PZG732 |
| 19 | SHIM (.007″) | 202PZG732 |
| 20 | SHIM (.020″) | 203PZG732 |
| 21 | PLATE RETAINER, Eccentric Bearing | 201PZG168 |
| 22 | SCREW, Retainer to Eccentric | 655EG08D |
| 23 | WIRE | 97A29 |
| 24 | PLUG- -SqHd PIPE | 64AC4 |
| 25 | CONNECTING ROD, Includes Reference Numbers 26 & 27 | 200PZG003 |
| 26 | BOLT CONNECTING ROD | 200PAH254 |
| 27 | NUT, Connecting Rod Bolt | 50AQ30 |
| 28 | LOCKNUT, Connecting Rod Bolt | 50M2 |
| 29 | BEARING, Connecting Rod to Eccentric | 12BA18 |
| 30 | RING RETAINING, Connecting Rod Bear | 74D18 |
| 31 | PLATE-RETAINING, Bearing to Eccentric | 1PZ1400 |
| 32 | SCREW, Bearing to Eccentric | 655EF05D |
| 33 | WIRE | 97A29 |
| 34 | PLATE RETAINER, Bearing to Connectin Rod | 201PZH253 |
| 34A | PLATE RETAINER, Bearing to Connectin Rod | 75B41 |
| 35 | SCREW, Bearing to Connecting Rod | 75B41 |
| 36 | WIRE | 97A29 |
| 37 | BEARING ROLLER, Crosshoad Pin | 12BA19 |
| 38 | PIN LOCK | PZ838 |
| 39 | SET SCREW | 76F10 |
| 40 | CROSSHEAD | 200ZPG005 |
| 41 | PIN CROSSHEAD | 200PZG189 |
| 42 | PLATE-RETAINER, Crosshead Pin | 202PZG168 |
| 43 | CREW, Retainer Plato to Crosshoad | 655EG09D |
| 43A | SCREW, Retainer Plate to Pin | 75AG17 |
| 44 | WIRE | 97A29 |
| 45 | OD EXTENSION | 200PZG839 |
| 46 | SCREW, Rod to Crosshoad | PO701 |
| 47 | WIRE | 97A29 |
| 48 | PLATE-RETAINER, Oil Stop Head to Fram | 200PZG168 |
| 49 | GASKET, Oil Stop Head | 25BC69N |
| 50 | HEAD OIL STOP | 200PZG051 |
| 51 | GASKET | 25F9 |
| 52 | SCREW, Oil Stop Head to Frame | 655EE080 |
| 53 | SEAL | 2011872 |
| 54 | RING-RETAINER, Oil Stop Head Seal | 1PV1398 |
| 55 | SCREW, Seal Retainer to Oil Stop Head | 75A102 |
| 56 | BAFFLE-PISTON ROD | 2FXK84O |
| 57 | ADAPTOR, Rotating Shaft | 2PO1398 |
| 58 | SCREW, Hex Head | 655EF050 |
Field Failure Repair Case Studies
Case 1: Worn Jackshaft Bearing Causing Excessive Vibration
A land drilling rig operating a Gardner Denver PZ-7 pump experienced severe vibration and abnormal noise, traced to a worn jackshaft roller bearing (12W75) with pitted raceways. Replacing the bearing, wear sleeve (80M7), and bearing housing gasket restored smooth operation, eliminating vibration and preventing further damage to the jackshaft assembly.
Case 2: Loose Connecting Rod Bolts Reducing Pump Efficiency
An offshore well servicing crew reported reduced pumping output and uneven torque transfer on a PZ-7 pump, caused by loose connecting rod bolts (200PAH254) that weakened power transmission. Re-torquing the bolts, replacing locknuts (50M2), and installing new bearing retainer plates restored full pumping efficiency, extending connecting rod service life by over 1500 operating hours.
Case 3: Failed Oil Stop Head Seal Causing Lubricant Leakage
A remote drilling rig detected power end oil leaks around the piston rod area, due to a degraded oil stop head seal (2011872) that lost sealing integrity. Replacing the seal, retainer ring, and gasket stopped leaks, maintaining proper oil levels and preventing bearing failure from insufficient lubrication.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these power end parts compatible only with the Gardner Denver PZ-7 mud pump? | Yes, all components are precision designed exclusively for the Gardner Denver PZ-7 mud pump, matching OEM fit, form, and API 7K performance specifications for the power end assembly exactly. |
| What shim thicknesses are included for bearing alignment? | This parts list includes graded shims in .002”, .005”, .007”, and .020” thicknesses, providing precise alignment adjustment for eccentric and jackshaft bearings. |
| Do these parts include all hardware for full power end assembly? | Yes, this lineup includes all required bearings, screws, nuts, shims, gaskets, seals, and retaining plates for complete assembly and repair of the PZ-7 power end. |
Conclusion & Procurement Guidance
This Gardner Denver PZ-7 power end assembly parts list is your definitive, API 7K-compliant resource for all procurement and technical repair needs for the PZ-7 mud pump. It eliminates the risk of ordering ill-fitting, low-quality parts, provides clear part number and quantity guidance for seamless ordering, and establishes a reliable technical standard for troubleshooting and maintaining your pump’s critical power end components. Whether you need to replace worn bearings, damaged connecting rods, faulty seals, or precision fasteners, this guide provides all critical details to make informed, cost-effective purchasing decisions. Choosing these precision-engineered, field-proven components ensures your Gardner Denver PZ-7 mud pump delivers consistent torque transfer, minimizes costly rig downtime, and withstands the harshest drilling conditions long-term. Reach out to secure these essential power end parts and keep your drilling operations running smoothly with reliable, OEM-equivalent components tailored to your exact PZ-7 pump configuration.
