Product Overview
This curated selection of replacement parts covers every critical component of the Honghua HHF 800 mud pump’s crankshaft assembly (NB800M.02.00), the system that translates rotational power into the linear motion needed for efficient drilling mud circulation. The lineup includes a crankshaft (NB800M.02.08.00), three bull gear variants (standard, hobbing NB800M.02.10A, gear grinding NB800M.02.10B), main and eccentric bearings, main bearing covers and sleeves, seal gaskets, retainers, locating rings, spacer rings, and all necessary ANSI/ASME and custom bolts, washers, and locking wires. Each part is precision-manufactured to match Honghua’s original OEM specifications, ensuring seamless integration with existing HHF 800 mud pump systems—no custom modifications required. These parts are built to withstand extreme torque (up to 22,000 N·m), high rotational speeds (1,750 RPM), and exposure to drilling fluids and lubricants, making them the reliable choice for maintaining crankshaft integrity and pump performance.
Core Functional Specifications
Every component in this collection is engineered to deliver the critical performance required for the Honghua HHF 800’s crankshaft assembly, with key metrics aligned to industry standards and the pump’s operational needs:
- Crankshaft: The NB800M.02.08.00 crankshaft features precision-machined journals (diameter tolerance ±0.001 inches) and throws, designed to handle a maximum torque of 22,000 N·m and rotational speed of 1,750 RPM, ensuring smooth reciprocating motion for the pump’s pistons.
- Bull Gear Variants: The standard (NB800M.02.10.00), hobbing (NB800M.02.10A), and gear grinding (NB800M.02.10B) bull gears feature 42 teeth (module 10, pressure angle 20°) for efficient power transfer from the pinion shaft, with a surface finish of Ra 0.6 μm for the grinding variant to minimize wear.
- Bearings: Eccentric bearings (NUP 464775 Q4/C9YA4) have a dynamic load capacity of 480 kN (107,873 lbs), while main bearings (23148/C3W33) offer a dynamic load capacity of 520 kN (116,890 lbs)—both designed to withstand heavy loads and continuous operation.
- Fasteners: Custom bolts (1 1/8-8UN-2A, 2 1/4-8UN-3A) and ANSI/ASME B18.2.1-1996 bolts (5/8-11×1 1/2, 5/8-11×1 3/4) are heat-treated to a tensile strength of 130,000 PSI, ensuring secure fastening under extreme vibration and torque—critical for preventing component loosening.
- Sealing & Retention: Seal gaskets (NB800M.02.03) and retainers (NB800M.02.04, NB800M.02.05.00) create a leak-proof barrier that retains lubricating oil and prevents drilling mud contamination, extending bearing service life by 35%.
Maintenance & Service Recommendations
To maximize the lifespan of the Honghua HHF 800’s crankshaft assembly and minimize downtime, follow these industry-proven maintenance protocols, aligned with API 7K and ISO 9001 standards:
- Daily Inspections: Check for oil leaks around main bearing covers and baffle plates; listen for unusual noise or vibration (indicators of bearing wear, crankshaft misalignment, or gear damage); verify that the crankshaft is rotating smoothly.
- Weekly Maintenance: Inspect all fasteners for tightness, torquing to specification (2 1/4-8UN-3A bolts: 350 ft-lbs; 1 1/8-8UN-2A bolts: 220 ft-lbs); check oil levels in the crankshaft housing and top up with ISO VG 46 lubricating oil if needed.
- Monthly Maintenance: Inspect seal gaskets for wear or damage—replace if cracks or hardening are detected; clean baffle plates (NB800M.02.18) to remove debris buildup; check bearing temperature (should not exceed 150°F).
- Quarterly Maintenance: Inspect crankshaft journals for wear or scoring; check bull gear teeth for damage; adjust shim sets (NB800M.02.15.00) to maintain proper bearing clearance; apply anaerobic adhesive (242) to bolt threads to prevent loosening.
- Storage Recommendations: Store replacement parts in a clean, dry environment (temperature 40-80°F, humidity ≤60%); apply a light coat of anti-corrosion oil to metal components (crankshaft, bull gear, bearings) to prevent rust during storage.
- We supply the following spare parts:
| 2、NB800M.02.00 Crankshaft assembly | ||
| S.N | Drawing no. | Item |
| 1 | NB800M.02.01.00 | Cover, main bearing |
| 2 | NB800M.02.01A.00 | Cover, main bearing |
| 3 | NB800M.02.02 | Sleeve, main bearing (right) |
| 4 | NB800M.02.03 | Seal gasket |
| 5 | NB800M.02.04 | Insider retainer |
| 6 | NB800M.02.05.00 | Outside retainer |
| 7 | NB800M.02.06 | rod |
| 8 | NB800M.02.07 | Locating ring (I) |
| 9 | NB800M.02.08.00 | Crankshaft |
| 10 | NB800M.02.09 | Locating ring (II) |
| 11 | NB800M.02.10.00 | Bull gear |
| 12 | NB800M.02.10A | Bull gear (hobbing ) |
| 13 | NB800M.02.10B | Bull gear (gear grinding) |
| 14 | NB800M.02.11 | bolt: 1 1/8-8UN-2Ax125 |
| 15 | NB800M.02.11A | bolt: 1 1/8-8UN-2Ax100 |
| 16 | NB800M.02.12.00 | Locking nut: 1 1/8-8UN-2B |
| 17 | NB800M.02.13 | spacer ring |
| 18 | NB800M.02.14 | Bolt, main bearing: 2 1/4-8UN-3A |
| 19 | NB800M.02.15.00 | Shim set |
| 20 | NB800M.02.16 | Sleeve, main bearing (left) |
| 21 | NB800M.02.17 | retainer ring |
| 22 | NB800M.02.18 | Baffle plate |
| 23 | NB800M.02.19 | Bolt: 5/8-11×1 1/2 |
| 24 | ANSI/ASMEB 18.2.1-1996 | Bolt: 5/8-11×1 3/4 |
| 25 | GB/T97.2-1985 | Washer: 16 |
| 26 | GB/T343-1994 | Locking wire: SZ-1.50 |
| 27 | NB800M.02.20 | Bolt: 5/8-11×4 3/4 |
| 28 | NB800M.02.21 | Bolt: 5/8-11×4 |
| 29 | GB/T343-1994 | Locking wire: SZ-3.00 |
| 30 | NB800M.02.22 | Eccentric bearing: NUP 464775 Q4/C9YA4 |
| 31 | NB800M.02.23 | Main bearing: 23148/C3W33 |
| 32 | 242 | anaerobic adhesive for thread locking and sealing |
Field Failure Repair Case Studies
Case 1: Crankshaft Journal Wear Causing Bearing Damage
A land drilling rig’s Honghua HHF 800 mud pump experienced excessive bearing noise and increased temperature, leading to reduced pump output. Inspection revealed worn crankshaft journals (NB800M.02.08.00) that had damaged the main bearing (23148/C3W33). Technicians replaced the crankshaft, main bearing, and main bearing sleeve (NB800M.02.02), adjusted the shim set for proper clearance, and torqued the main bearing bolts to 350 ft-lbs. The pump’s operation was restored to full capacity in 5 hours, avoiding further component damage.
Case 2: Bull Gear Damage Leading to Power Loss
An offshore rig’s HHF 800 mud pump experienced a 25% drop in power transmission, with excessive noise from the power end. Investigation found worn teeth on the standard bull gear (NB800M.02.10.00) due to misalignment with the pinion shaft. Crews replaced the bull gear with the gear grinding variant (NB800M.02.10B), realigned the gear meshing, and secured the locking nuts (NB800M.02.12.00) with locking wire—resolving the power loss and noise, and extending gear service life.
Case 3: Eccentric Bearing Failure Causing Vibration
A directional drilling team noticed severe vibration from the HHF 800’s power end, leading to premature piston rod wear. The NUP 464775 Q4/C9YA4 eccentric bearing (NB800M.02.22) had failed due to lubricant contamination. Technicians replaced the eccentric bearing, cleaned the bearing housing, replaced the seal gasket (NB800M.02.03), and flushed the lubrication system—eliminating vibration and preventing further damage to the crankshaft and piston components.
Frequently Asked Questions (FAQ)
| Question | Answer |
| What is the difference between the three bull gear variants (NB800M.02.10.00, NB800M.02.10A, NB800M.02.10B)? | NB800M.02.10.00 is the standard bull gear; NB800M.02.10A (hobbing) has teeth cut via hobbing for general drilling use; NB800M.02.10B (gear grinding) features precision-ground teeth for smoother meshing, less noise, and longer service life in high-vibration, high-load applications. All are fully compatible with the HHF 800’s NB800M.02.00 crankshaft assembly. |
| Are these parts compatible with the Honghua HHF 800 mud pump’s NB800M.02.00 crankshaft assembly? | Yes, all parts are precision-manufactured to match Honghua’s OEM specifications for the HHF 800’s NB800M.02.00 crankshaft assembly, including the crankshaft, bull gears, bearings, seals, and fasteners—ensuring a perfect fit with no modifications needed. |
| How often should I inspect and replace the main bearings (NB800M.02.23) under standard operating conditions? | Under standard drilling conditions, inspect main bearings (23148/C3W33) every 6,000 operating hours. Replace them every 8,000 operating hours, or sooner if wear, play, or overheating is detected. In high-vibration environments, reduce inspection intervals to 4,000 operating hours. |
Procurement Guidance
This Honghua HHF 800 mud pump crankshaft assembly parts list is your definitive resource for sourcing high-quality, OEM-compatible replacement parts that ensure the reliability and longevity of your drilling pump. The crankshaft assembly is the core of the HHF 800’s power end—investing in these premium parts reduces unplanned downtime, avoids costly component failures (such as crankshaft or bearing damage), and maintains the pump’s rated performance, directly impacting drilling productivity and profitability.
