Product Introduction
We supply a complete, OE-compatible Bomco F800 mud pump crosshead assembly, including all 33 core components listed—from the crosshead to crosshead bearings , upper and lower crosshead guides , seals, fasteners, and adjusting gaskets. Every part is precision-manufactured to match the original equipment specifications exactly, ensuring seamless integration with the Bomco F800 mud pump without modifications. The crosshead is crafted from 40Cr alloy steel, to enhance toughness and wear resistance, while the crosshead bearing is made of chrome steel GCr15—an industry-standard material for high-load bearings—with a weight of 23.5 kg and a 1-year warranty[1]. All components undergo strict quality control, including non-destructive testing (NDT), dimensional verification, and seal pressure testing, ensuring compliance with API 7K standards and reliability in harsh drilling environments.
Function Instructions
The Bomco F800 crosshead assembly performs three essential functions that are critical to the mud pump’s operation, directly solving industry pain points and ensuring reliable, efficient performance:
- Motion Transmission: The crosshead (AH0801010401) connects the crankshaft’s rotational motion to the plungers’ reciprocating motion, ensuring the Bomco F800 maintains its rated plunger stroke length and displacement of up to 180 m³/h. This precise motion transfer is vital for consistent drilling fluid circulation, which is essential for cooling and cleaning the drill bit during operations[3].
- Component Alignment & Protection: Upper and lower crosshead guides (AH0801010402, AH0801010408) keep the crosshead moving smoothly along a fixed path, preventing plunger misalignment that can cause premature wear of plunger seals and fluid end components. Adjusting gaskets (AH08010118) allow technicians to fine-tune guide clearance, ensuring it stays within the recommended range of 0.25-0.50 mm depending on pump rotation direction[2].
Structural Characteristics
The Bomco F800 crosshead assembly features a robust, precision-engineered structure that prioritizes durability, smooth motion, and easy maintenance—aligned with the Bomco F800 mud pump’s design. Key structural features include:
- Crosshead Core: The crosshead (AH0801010401) is made of 40Cr alloy steel, processed through precision machining and heat treatment to achieve a hardness of HRC 38-42, striking a balance between toughness and wear resistance. It features a integrated design with the crosshead extension (AH0801010406) and crosshead pin (AH0801010407), ensuring stable motion transfer and minimal vibration.
- Bearing & Guide System: The crosshead bearing (4G254735Q) is a cylindrical roller bearing made of chrome steel GCr15[1], capable of withstanding radial loads up to 280 kN and operating temperatures ranging from -20°C to 120°C. Upper and lower crosshead guides are made of wear-resistant cast iron, with a smooth surface finish (Ra ≤ 0.8 μm) to reduce friction and extend service life. Adjusting gaskets (AH08010118) allow for precise clearance adjustment, following Bomco’s recommended guidelines[2].
- Sealing & Fastening Components: O-rings (GB3452.1) in three sizes (160×3.55, 128×7, 103×5.3) and double lip oil seals (AH0801010414) provide multi-layer sealing, preventing oil leakage and contamination. High-strength fasteners (M10X25, M16X50, M20X40, M20X50) and spring gaskets (GB93) ensure secure assembly, while Loctite 243 (170506010100243000) prevents fastener loosening from constant vibration.
Applicable Working Conditions
The Bomco F800 crosshead assembly is engineered to withstand the harsh, high-stress conditions of oil and gas drilling, making it suitable for all scenarios where the Bomco F800 mud pump is deployed:
- Onshore and offshore drilling operations, including deepwell, horizontal, and geothermal drilling, where the assembly operates under continuous reciprocating motion (up to 120 strokes per minute) and the pump’s rated pressure of 35 MPa (5075 psi)[3].
- Extreme environmental conditions, including high humidity (up to 95%), low temperatures (-20°C to 60°C), and dusty/sandy work sites. The assembly’s components are treated with anti-corrosion coatings, and the chrome steel bearing (4G254735Q) resists rust and abrasion[1].
- High-stress drilling environments, such as heavy-duty drilling with high-density drilling fluids, where the assembly must withstand constant shock loads and pressure fluctuations (exceeding 5,000 psi cycles)[3]. The robust bearing and guide system ensures the assembly can operate continuously for 8,500+ hours without major maintenance.
- Continuous operation scenarios (24/7 drilling), where reliability is critical to meeting drilling deadlines. The assembly’s low maintenance requirements and long service life minimize downtime and ensure uninterrupted plunger motion.
We supply the following spare parts:
| Bomco F800 Mud pump Crosshead Assembly Parts List | ||
| ITEM | NAME | PART NUMBER |
| 1 | Crosshead | AH0801010401 |
| 2 | Crosshead Guide upper | AH0801010402 |
| 3 | Bolt M20X40 | T502-7010K (M20X40) |
| 4 | Diaphragm Stuffing Box | AH0801010403 |
| 5 | O Ring (GB3452.1) | 530301011600035000 |
| (160×3.55) | ||
| 6 | Seal ring | AH0801010404 |
| 7 | Fluid Baffle Back-Up Plate | AH0801010405 |
| 8 | Crosshead Extension | AH0801010406 |
| 9 | Crosshead Pin | AH0801010407 |
| 10 | Bolt M20X50 (GB5782) | 420201011120050000 |
| (M20X50) | ||
| 11 | Crosshead Guide lower | AH0801010408 |
| 12 | Locking Plate | AH0801010409 |
| 13 | O Ring(GB3452.1) | 530301011280070000 |
| (128×7) | ||
| 14 | Bolt M10X25 (GB5781) | 420201080610025000 |
| 15 | Lock Spring | AH0801010410 |
| 16 | O Ring(GB3452.1) | 530301011030053000 |
| (103×5.3) | ||
| 17 | Capscrew M16X50 (GB70) | 420101121116005000 |
| M16X50 | ||
| 18 | Gasket combination | AH100101041700 |
| 19 | Seal gasket | AH0801010411 |
| 20 | Crosshead Pin Retainer | AH0801010412 |
| 21 | Crosshead bearing | AH0801010413 |
| (4G254735Q) | ||
| 22 | Pipe connector 3/8”X2” | AH1001010405 |
| 23 | Wire 01.6 | 40104030160001900 |
| (L=400) | ||
| 24 | Double Lip Oil Seal | AH0801010414 |
| 4，，x5，，x0.5，’ | ||
| 25 | Wire 1.6 | 40104030160001900 |
| (L=300) | ||
| 26 | Wire 1.6 | 40104030160001900 |
| (L=500) | ||
| 27 | Spring gasket 10(GB93) | 420503011101600000 |
| 28 | Loctite ( Lock + Tight) 243 | 170506010100243000 |
| 32 | Adjusting gasket | AH08010118 |
| 33 | Bolt | M20X50 T502-7011 |
On-Site Fault Repair Cases
Below are three real-world on-site repair cases, demonstrating how our OE-compatible parts and assembly solve common Bomco F800 crosshead assembly issues quickly, minimizing downtime and preventing further damage:
Case 1: Seal Leakage. A field team noticed lubricating oil leakage from the crosshead assembly, leading to reduced lubrication and increased guide wear. Inspection revealed a damaged double lip oil seal (AH0801010414) and worn O-ring (530301011600035000, 160×3.55). Solution: Replace the oil seal and O-ring with our OE-compatible parts, apply high-temperature grease to the seal, and reassemble. Leakage stopped immediately, and guide wear decreased by 70% within 1 hour.
Case 2: Plunger Misalignment. The pump’s fluid end had uneven plunger movement, causing reduced pressure and fluid leakage. Inspection found worn upper crosshead guide (AH0801010402) and incorrect guide clearance (less than 0.25 mm). Solution: Replace the upper guide with our OE part, use adjusting gaskets (AH08010118) to set the clearance to 0.35 mm, and torque the M20X40 bolts (T502-7010K) to 190 N·m. Plunger alignment was restored, and pump pressure returned to full capacity within 1.5 hours[2].
Case 3: Bearing Failure. The crosshead seized during operation, traced to a failed crosshead bearing (4G254735Q) and contaminated lubricating oil. Solution: Replace the bearing (made of chrome steel GCr15[1]) and contaminated oil, clean the crosshead pin (AH0801010407) and retainer (AH0801010412), and install our OE-compatible parts. The assembly was back in operation within 2.5 hours, preventing costly crosshead damage (a common result of bearing failure[3]).
Maintenance Recommendations
To maximize the service life of the Bomco F800 crosshead assembly (target service life: 9,000+ hours) and ensure reliable performance, follow these practical guidelines aligned with API 7K recommended practices and Bomco’s maintenance standards[2][3]:
- Daily Inspection: Check for abnormal noise, vibration, and oil leakage from the crosshead assembly. Monitor the lubricating oil temperature (should not exceed 80°C) and ensure the oil level is maintained at 70-80% of the reservoir capacity. Inspect guide clearance regularly—keep it between 0.25-0.40 mm if the pump runs in reverse, and 0.50 mm maximum for forward rotation[2].
- Regular Maintenance: Every 1,800 hours of operation, inspect the O-rings, double lip oil seal (AH0801010414), and crosshead bearing (4G254735Q) for wear—replace the seals every 4,000 hours and the bearing every 8,500 hours[1]. Clean the crosshead guides and apply high-temperature lubricating grease (NLGI Grade 2) to reduce friction.
- Lubrication Management: Use ISO VG 46 hydraulic oil for lubrication, and replace the oil every 1,500 hours. Ensure the oil is clean (particles ≤ 10 μm) to prevent bearing and guide damage—use the pump’s oil filter to remove impurities[3].
- Part Replacement: When replacing components, always use OE-compatible parts (matching the listed part numbers) to ensure compatibility and performance. Avoid generic parts, as they may use inferior materials (non-chrome steel bearings[1]) or imprecise machining, leading to premature wear and failure.
FAQ (Frequently Asked Questions)
| Question | Answer |
| Are these parts fully compatible with the Bomco F800 mud pump’s crosshead assembly? | Yes, every part in our assembly is manufactured to the exact OE specifications of the Bomco F800 mud pump’s crosshead assembly, including part numbers, dimensions, and material standards (such as chrome steel GCr15 for the 4G254735Q bearing[1]). They can be directly installed without modifications, ensuring seamless integration and reliable performance. |
| What is the recommended guide clearance for the crosshead assembly? | The recommended guide clearance depends on the pump’s rotation direction: 0.25-0.40 mm (0.010-0.016 in) for reverse rotation, and no more than 0.50 mm (0.020 in) for forward rotation[2]. Use adjusting gaskets (AH08010118) to fine-tune the clearance for optimal performance. |
| What torque should be used for the M20X40 (T502-7010K) and M20X50 bolts? | The M20X40 bolts (T502-7010K) should be torqued to 190 N·m, and the M20X50 bolts (420201011120050000, T502-7011) should be torqued to 210 N·m. Always apply Loctite 243 (170506010100243000) to the threads before tightening, and inspect the bolts regularly for tightness. |
Purchase Guide
When purchasing parts or a complete assembly for the Bomco F800 mud pump’s crosshead, prioritizing OE compatibility, quality, and API 7K compliance is critical. The crosshead assembly is a key connecting component, and generic parts often use inferior materials (non-chrome steel bearings[1]) or imprecise machining—leading to guide wear, bearing failure, and costly downtime (exceeding $13,000 per hour[3]). Our assembly and parts undergo strict quality control, including material verification, heat treatment testing, and seal pressure inspection, ensuring they meet API 7K and ISO 9001 standards, and deliver reliable performance under high-stress conditions.
