Crosshead-Related Parts Catalog for ZJ40 Truck-mounted Drilling Rig

1

Crosshead (107.29.30.11)

42CrMo alloy steel; carburizing and quenching surface treatment; precision ground finish

1. Fatigue cracking due to long-term alternating loads during continuous drilling; 2. Surface wear caused by insufficient lubrication and contamination of lubricating oil with abrasive particles

1. Use lubricating oil that meets OEM specifications and replace oil filters regularly; 2. Conduct non-destructive testing (NDT) for fatigue cracks every 1000 operating hours

2

Extension Crosshead (107.29.30.08)

42CrMo alloy steel; nitrocarburizing surface treatment; alloy steel connecting shaft

1. Connecting part deformation due to uneven load transmission; 2. Surface corrosion caused by oil leakage and moisture intrusion into the crankcase

1. Ensure precise alignment during installation to avoid uneven load; 2. Inspect crankcase oil tightness monthly and clean surface oil stains to prevent corrosion

3

Crosshead Guide Upper (107.29.30.12)

Q355B alloy steel; wear-resistant copper alloy lining; precision machined guide surface

1. Lining wear due to long-term reciprocating friction with the crosshead; 2. Guide surface deformation caused by thermal expansion and contraction under high-temperature operation

1. Maintain sufficient lubrication between the guide and crosshead; 2. Monitor crankcase temperature, avoid continuous operation above 90°C, and cool down periodically

4

Crosshead Guide Lower (107.29.30.14)

Q355B alloy steel; babbitt metal lining; anti-corrosion paint coating

1. Lining ablation caused by insufficient lubrication and local high temperature; 2. Corrosion of the guide body due to long-term contact with contaminated lubricating oil

1. Check lubricating oil supply pressure weekly to ensure stable oil flow; 2. Replace lubricating oil according to maintenance schedule and clean the crankcase interior

5

Pin, Crosshead (107.29.30.09)

20CrNiMo alloy steel; chrome-plated surface; precision grinding

1. Shear damage due to sudden load changes during drilling startup; 2. Surface wear caused by relative rotation with the crosshead bushing

1. Start the drilling rig smoothly to avoid sudden load impacts; 2. Apply molybdenum disulfide lubricant to the pin surface during installation and inspect for wear every 500 operating hours

6

Retainer, Pin (107.29.30.10)

45# carbon steel; heat treatment; zinc plating for corrosion resistance

1. Fatigue failure due to long-term vibration of the power transmission system; 2. Corrosion and loosening caused by moisture intrusion into the crankcase

1. Use locking washers to enhance fixing reliability; 2. Inspect the retainer for deformation and corrosion monthly and replace if damaged

7

Bearing (107.076.CG)

GCr15 bearing steel; chrome steel balls; low-temperature resistant grease filling

1. Bearing cage damage due to contaminated lubricating oil with metal particles; 2. Ball wear caused by insufficient lubrication and high-speed operation

1. Install a high-precision oil filter to prevent metal particles from entering the bearing; 2. Replace the bearing grease every 800 operating hours and clean the bearing raceway

8

Diaphragm Stuffing Box (107.29.30.06)

2Cr13 stainless steel; nitrile rubber diaphragm; copper alloy valve core

1. Diaphragm aging and cracking due to long-term contact with high-temperature lubricating oil; 2. Valve core wear caused by frequent pressure regulation

1. Replace the diaphragm every 6 months or when oil leakage occurs; 2. Avoid frequent and drastic pressure regulation, and maintain stable system pressure

1

O Ring Rubber (7601-1610-22)

Nitrile rubber (NBR); Shore hardness 70±5; oil-resistant and high-temperature resistant

1. Aging and cracking due to long-term exposure to high-temperature lubricating oil; 2. Damage caused by improper installation (overstretching or scratching)

1. Store O-rings in a cool, dry environment away from direct sunlight; 2. Use professional installation tools to avoid overstretching and check for burrs on mating surfaces before installation

2

Gasket (107.29.30.07)

Asbestos-free graphite composite; stainless steel (304) skeleton; high-pressure resistant

1. Compression deformation and leakage due to excessive fastening torque; 2. Deterioration caused by long-term contact with corrosive impurities in lubricating oil

1. Use a torque wrench to fasten bolts to the specified torque; 2. Replace the gasket every time the assembly is disassembled and clean the mating surface thoroughly

3

Gasket (107.29.30.15)

PTFE composite material; copper alloy reinforcement; low friction coefficient

1. Surface wear due to micro-vibration between mating surfaces; 2. Damage caused by foreign particles adhering to the surface during installation

1. Inspect the mating surface for cleanliness before installation, remove any foreign particles; 2. Avoid frequent disassembly of the assembly to reduce gasket wear

1

Screw LNB/AC1-15-09

42CrMo alloy steel; heat treatment (HV 320-380); zinc-nickel plating

1. Thread wear and sliding caused by repeated disassembly; 2. Fatigue fracture due to long-term vibration of the power system

1. Avoid over-tightening during installation and use thread lubricant; 2. Inspect screws for thread damage quarterly and replace if necessary

2

Screw, Socket LS7601-0341-86

304 stainless steel; socket head design; passivated surface

1. Socket wear caused by improper use of tools; 2. Corrosion caused by moisture and oil contamination

1. Use matching socket tools to avoid slipping and damaging the socket; 2. Clean the screw surface regularly and apply anti-corrosion grease

3

Screw LNB/AC1-2-07

45# carbon steel; heat treatment; galvanized plating

1. Thread loosening caused by long-term vibration; 2. Corrosion of the screw shank due to oil leakage

1. Use lock washers or thread locking glue to enhance anti-loosening performance; 2. Inspect the tightness of screws every 200 operating hours

4

Screw LNB/AC1-1-05

42CrMo alloy steel; high-strength thread; black oxide finish

1. Thread damage caused by cross-threading during installation; 2. Fatigue failure due to uneven load bearing

1. Align the screw correctly during installation to avoid cross-threading; 2. Ensure uniform load distribution when multiple screws are used

5

Washer LNB/AC3-3-07

65Mn spring steel; heat treatment; surface phosphating

1. Elastic fatigue and deformation due to long-term compression; 2. Corrosion caused by moisture and oil immersion

1. Replace washers every time the screw is disassembled; 2. Store washers in a dry environment to avoid moisture corrosion

6

Washer LNB/AC3-1-03

304 stainless steel; flat washer design; passivated surface

1. Surface wear due to friction with the screw head and mating surface; 2. Corrosion caused by external moisture intrusion

1. Ensure the washer is fully seated during installation; 2. Clean the washer surface regularly to remove oil and dust

7

Locking Plate (107.29.30.13)

Q235B carbon steel; bending forming; anti-corrosion paint coating

1. Bending deformation due to improper installation force; 2. Corrosion and cracking caused by long-term exposure to oil and moisture

1. Use appropriate tools to install the locking plate without excessive force; 2. Inspect the locking plate for deformation and corrosion monthly and replace if damaged

8

Wire (107.29.30.05)

Copper core wire; PVC insulation; oil-resistant and flame-retardant

1. Insulation aging and cracking due to high-temperature radiation from the power system; 2. Wire breakage caused by vibration and friction with adjacent components

1. Install heat shields between the wire and high-temperature components; 2. Secure the wire with clips to avoid friction and inspect insulation for damage quarterly