Classification & Technical Guide for HHF-1300/1600 Crosshead Assembly Parts

1

11-3161-0401

Crosshead

High-strength alloy steel (4140) with heat treatment and precision machining, hardened contact surfaces for wear resistance

1. Abrasive wear from misaligned slides; 2. Fatigue cracks from repeated linear motion; 3. Corrosion from lubricant contaminants.

1. Ensure proper alignment with upper/lower slides; 2. Use API GL-4 lubricants and replace every 500 operating hours; 3. Conduct monthly magnetic particle testing for cracks.

2

11-3161-0413

Crosshead Pin

Bearing steel (GCr15) with nitride treatment, precision-ground to support rotational motion within the crosshead

1. Journal wear from insufficient lubrication; 2. Bending deformation from uneven loads; 3. Seizure from bearing failure.

1. Maintain adequate lubricant flow to the crosshead bearing; 2. Avoid overloading the pump beyond rated capacity; 3. Inspect pin alignment during routine maintenance.

3

11-3161-0412

Crosshead extension rod

Alloy steel (4340) with heat treatment, designed to transmit linear motion from the crosshead to the pump’s fluid end

1. Tensile fatigue from repeated linear cycling; 2. Thread wear from connection loosening; 3. Corrosion from outdoor exposure.

1. Inspect thread tightness monthly; 2. Apply anti-corrosive coating to exposed surfaces; 3. Replace if fatigue cracks or thread damage is detected.

4

11-3161-0416

Crosshead Pin Cap

Carbon steel (A36) with galvanized finish, designed to secure the crosshead pin and prevent axial movement

1. Loosening from operational vibration; 2. Corrosion from lubricant contaminants; 3. Impact damage from loose components.

1. Torque fasteners to recommended specs; 2. Clean and inspect for corrosion during lubricant changes; 3. Secure loose components to prevent impact.

1

11-3161-0417

Crosshead Bearing, 254941QU

Rolling bearing steel with brass cages, designed to handle rotational motion between the crosshead and pin

1. Cage damage from shock loads; 2. Rolling element wear from contaminated lubricant; 3. Seizure from insufficient oil flow.

1. Avoid sudden shock loads during pump startup; 2. Filter lubricant to remove abrasive particles; 3. Ensure adequate oil flow to the bearing cavity.

2

11-3161-0402

Slide, Upper

Cast iron (HT250) with anti-friction coating, designed to guide the crosshead’s linear motion

1. Abrasive wear from misalignment; 2. Coating degradation from high temperatures; 3. Scuffing from insufficient lubrication.

1. Align with the crosshead and lower slide during assembly; 2. Maintain operating temperatures below 100°C; 3. Reapply anti-friction coating annually.

3

11-3161-0415

Slide, Lower

Cast iron (HT250) with anti-friction coating, designed to guide the crosshead’s linear motion

1. Abrasive wear from misalignment; 2. Coating degradation from high temperatures; 3. Scuffing from insufficient lubrication.

1. Align with the crosshead and upper slide during assembly; 2. Maintain operating temperatures below 100°C; 3. Reapply anti-friction coating annually.

4

11-3161-0419

Slide retainer plate

Carbon steel (A1011) with galvanized finish, designed to secure upper/lower slides and maintain alignment

1. Wear from slide movement; 2. Corrosion from outdoor exposure; 3. Loosening from vibration.

1. Torque fasteners evenly to secure slides; 2. Clean and reapply anti-corrosive coating quarterly; 3. Inspect alignment during routine maintenance.

5

11-3161-0403-00, 11-3161-0404

Shim (8 pcs + 2 pcs)

Stainless steel (301) with precise thickness, designed to adjust slide alignment and crosshead clearance

1. Bending from improper installation; 2. Corrosion from lubricant contaminants; 3. Wear from slide movement.

1. Use multiple thin shims for precise alignment; 2. Avoid over-tightening fasteners to prevent bending; 3. Replace if corrosion or deformation is detected.

1

11-3161-0405

Stuffing Box

Carbon steel (A105) with anti-rust coating, designed to house seals and prevent lubricant leakage from the crosshead

1. Corrosion from drilling mud and moisture; 2. Wear from seal friction; 3. Cracking from uneven pressure.

1. Clean regularly to remove mud buildup; 2. Replace seals annually to reduce friction; 3. Ensure even pressure distribution during assembly.

2

11-3161-0406, 11-3161-0407

Oil Seal; Oil Seal, 5"*6.25"*0.625" (2 pcs)

Nitrile rubber (NBR) with steel cases, oil-resistant and designed to prevent lubricant leakage

1. Lip wear from shaft/rod rotation; 2. Degradation from high temperatures; 3. Damage from misaligned components.

1. Ensure component alignment to reduce lip friction; 2. Maintain operating temps below 120°C; 3. Replace seals at first sign of leakage.

3

B34521-190-355-69, B34521-125-700-69, B34521-160-700-69

O Ring, 190*3.55G; O Ring, 125*7.0G; O Ring, 160*7.0G

Fluorocarbon rubber (FKM), chemical-resistant and suited for high-pressure sealing

1. Material degradation from incompatible fluids; 2. Compression set from over-torquing; 3. Cracking from thermal cycling.

1. Use fluids compatible with FKM; 2. Avoid over-compressing during installation; 3. Replace O-rings after each disassembly.

4

11-3161-0408, 11-3161-0414

Gasket (2 pcs)

PTFE (Teflon) with glass fiber reinforcement, chemical-resistant and designed for high-pressure sealing

1. Creep deformation under prolonged pressure; 2. Damage from sharp mating surfaces; 3. Degradation from lubricant contaminants.

1. Inspect mating surfaces for sharp edges; 2. Avoid over-torquing to prevent creep; 3. Replace gaskets with each cover removal.

5

11-3161-0409

End Cover

Carbon steel (A1011) with epoxy coating, designed to protect the stuffing box and internal components

1. Coating damage from debris impact; 2. Warping from uneven torque; 3. Corrosion from outdoor exposure.

1. Install debris guards to prevent impact; 2. Torque fasteners evenly; 3. Touch up epoxy coating annually.

6

11-3161-0411

Baffle

Carbon steel (A36) with galvanized finish, designed to direct lubricant flow and prevent debris entry

1. Corrosion from lubricant contaminants; 2. Erosion from high lubricant flow; 3. Impact damage from loose parts.

1. Clean baffles during lubricant changes; 2. Ensure proper lubricant flow to reduce erosion; 3. Secure loose components.

7

11-3161-0410

Locking Spring

Spring steel (65Mn) with heat treatment, designed to secure seals and prevent movement

1. Loss of elasticity from prolonged use; 2. Bending during assembly; 3. Corrosion from moisture.

1. Avoid over-stretching during installation; 2. Replace if elasticity decreases; 3. Use moisture-inhibiting lubricants.

8

11-3161-0418

Pipe Joint, NPT3/8*50.8 (2 pcs)

Brass (C36000), designed to connect lubrication lines and ensure oil flow to critical components

1. Thread wear from repeated assembly; 2. Corrosion from moisture; 3. Leakage from improper tightening.

1. Use thread sealant during installation; 2. Tighten to recommended torque (15 ft-lbs); 3. Inspect for leaks monthly.

9

11-3161-0425

Lock-fife (25ml)

High-strength thread locker, designed to secure fasteners and prevent vibration-induced loosening

1. Degradation from high temperatures; 2. Loss of adhesion from contaminated threads; 3. Curing failure from improper application.

1. Apply to clean, dry threads; 2. Avoid operating temps above 180°C; 3. Allow proper curing time (24 hours) before startup.

10

11-3161-0424

Steel Wire Φ1.6 (As required)

Stainless steel (304) with high tensile strength, designed to secure fasteners and components

1. Fatigue failure from vibration; 2. Corrosion from moisture; 3. Breakage from improper tension.

1. Apply proper tension during installation; 2. Inspect monthly for fatigue; 3. Replace annually or if corrosion is present.

1

11-3161-0420

Screw, 3/4-10UNC-2A*65 (8 pcs)

Steel (Grade 8) with zinc plating, medium-strength for securing slides and retainer plates

1. Corrosion from moisture and mud; 2. Thread wear from vibration; 3. Head damage from improper tool use.

1. Torque to 55 ft-lbs; 2. Apply anti-corrosive spray after installation; 3. Use a matching socket wrench.

2

11-3161-0421

Bolt, 1-8UNC-2A*60 (2 pcs)

Alloy steel (Grade 10.9) with cadmium plating, high-strength for securing crosshead components

1. Fatigue failure from vibration; 2. Thread stripping from over-torquing; 3. Plating damage leading to corrosion.

1. Torque to 120 ft-lbs; 2. Use thread lubricant to reduce wear; 3. Replace bolts if plating is damaged.

3

11-3161-0422

Bolt, 1-8UNC-2A*70 (14 pcs)

Alloy steel (Grade 10.9) with cadmium plating, high-strength for securing crosshead components

1. Fatigue failure from vibration; 2. Thread stripping from over-torquing; 3. Plating damage leading to corrosion.

1. Torque to 125 ft-lbs; 2. Use thread lubricant to reduce wear; 3. Replace bolts if plating is damaged.

4

11-3161-0423

Bolt, 3/8-16UNC-2A×40 (4 pcs)

Steel (Grade 8) with zinc plating, light-strength for securing covers and brackets

1. Corrosion from outdoor exposure; 2. Bolt stretching from over-torquing; 3. Thread wear from repeated installation.

1. Torque to 20 ft-lbs; 2. Apply thread sealant to prevent moisture ingress; 3. Retighten monthly.

5

B0093-10-59

Spring Washer, 10 (4 pcs)

Steel (65Mn) with heat treatment, designed to prevent bolt loosening from vibration

1. Fatigue failure from repeated vibration; 2. Deformation from over-torquing; 3. Corrosion from moisture.

1. Replace washers annually; 2. Avoid over-torquing to prevent deformation; 3. Use with anti-corrosive lubricants.

How often should the crosshead bearing and seals be replaced?

Replace the crosshead bearing (254941QU) every 2,000 operating hours per ISO 281. Replace oil seals and O-rings annually or at the first sign of leakage; for harsh environments, inspect monthly and replace as needed to maintain API 610 leak-proof standards.

What torque specifications are recommended for the 1-8UNC-2A bolts?

Bolt 11-3161-0421 (1-8UNC-2A*60) requires 120 ft-lbs, and bolt 11-3161-0422 (1-8UNC-2A*70) requires 125 ft-lbs, per ASME B18.2.1. Use a calibrated torque wrench and thread lubricant to prevent thread wear and ensure secure fastening.

How to maintain proper crosshead alignment and prevent wear?

Use shims to adjust upper/lower slide alignment during assembly, inspect alignment monthly, and maintain adequate lubrication with API GL-4 oil. Replace worn slides or retainer plates immediately, as misalignment causes excessive crosshead and bearing wear.