BOMCO Drawworks Lubricating System Parts Classification

1

Oil Pump Assembly

XYZ-150ABS0 (Part No.: 512601010078015000)

Rotor: 45# carbon steel (surface quenching); Stator: HT250 gray cast iron; Gear: 20CrMnTi alloy steel; Seal Ring: fluororubber

1. Rotor and stator wear caused by impure oil and long-term high-speed operation; 2. Seal ring aging and oil leakage caused by high-temperature environment

1. Ensure the oil cleanliness meets NAS 8 level, install a pre-filter at the oil inlet; 2. Replace the seal ring every 10 months, and check the oil pump pressure regularly (maintain within the rated range of 0~1.6MPa)

2

Oil Filter

WUI-E250X180DFBP (Part No.: 512605013125018000), Oil Filter Suction (AF700306-060200), Oil Filter Plate (AF700304-1507), Oil Filter Flange (AF700304-1512)

Filter Element: Glass fiber (high-precision filtration); Housing/Plate/Flange: 304 stainless steel; Seal Ring: nitrile rubber

1. Filter element blockage caused by oil contamination and metal particles; 2. Housing corrosion and flange leakage caused by humid environment and oil erosion

1. Replace the filter element every 500 operating hours, and clean the housing during replacement; 2. Check the flange connection tightness every 7 days, apply thread sealant if necessary, and store spare filters in a dry and ventilated environment

3

Pressure Gauge & Pressure Sensor

Double scale pressure gauge Y-60N 0~1.6MPa (Part No.: 380202051160006000), Pressure sensor BSCYG9010-1.0 (Part No.: 380210100010000000)

Pressure Gauge: Case (304 stainless steel), Bourdon Tube (copper alloy), Dial (aluminum alloy); Pressure Sensor: Shell (304 stainless steel), Sensor Core (semiconductor material)

1. Bourdon tube damage caused by pressure impact; 2. Sensor drift caused by long-term high temperature and vibration

1. Install a pressure buffer valve at the gauge/sensor inlet to avoid sudden pressure changes; 2. Calibrate the pressure gauge every 6 months according to JJG 52-2013 standard, and calibrate the sensor every 12 months with a standard pressure source

4

Throttle Valve

MG30G1.2 (Part No.: 512604100700273000)

Valve Body: Aluminum alloy (anodized); Spool: 45# carbon steel (quenched and tempered); Seal Ring: nitrile rubber

1. Spool jamming caused by dust and oil impurities; 2. Seal leakage caused by long-term frequent adjustment

1. Install a precision filter before the valve to prevent impurities from entering; 2. Avoid excessive and frequent adjustment of the valve, and apply a thin layer of lubricating grease on the spool during maintenance

5

Stainless Ball Valve

Rc11/2 (Part No.: 441205010016380000)

Valve Body: 304 stainless steel; Ball Core: 316 stainless steel; Seal Ring: PTFE (polytetrafluoroethylene)

1. Ball core wear caused by long-term flow of impurity-containing oil; 2. Seal ring damage caused by high-temperature oil erosion

1. Ensure the oil is filtered to remove impurities before entering the valve; 2. Control the operating temperature ≤ 120℃, and check the valve opening and closing flexibility regularly

1

Oil Lines (Plow Line/Oil Return Line/Pressure Gauge Pipeline)

Plow line assembly (AF700306-060100), Oil return line (AF700303-110300), Oil return line II (AF700303-110400), Oil return line (AF700304-1510), Pressure gauge pipeline (AF700302-0703), Piping L=131 (TTA4022-131)

Inner Tube: Nitrile rubber (oil-resistant); Reinforcement Layer: High-strength steel wire braid; Outer Cover: Neoprene rubber (wear-resistant); Hard Piping: 304 stainless steel

1. Rubber line cracking caused by high pressure, frequent bending, and high temperature; 2. Hard piping deformation and welding seam leakage caused by vibration and impact

1. Avoid excessive bending of rubber lines (minimum bending radius ≥ 10 times the pipe diameter), and replace every 24 months; 2. Fix hard piping with anti-vibration pipe clamps, inspect welding seams with NDT every 6 months, and repair cracks in time

2

HP Hoses

HP hose 2BI (140507012501000000), HR hose 251- (140507012501000000), HP hose 251- (140507012501000000), HP hose 45II- (140507014502000000)

Inner Tube: High-pressure resistant nitrile rubber; Reinforcement Layer: Multi-layer steel wire braid; Outer Cover: Wear-resistant and anti-corrosion rubber

1. Hose burst caused by exceeding rated pressure and long-term high-load operation; 2. Interface leakage caused by seal ring aging and vibration

1. Ensure the working pressure ≤ rated pressure (consistent with the pressure gauge range of 0~1.6MPa), and avoid bending near the interface; 2. Replace the hose every 18 months, and check the interface seal ring regularly

3

Pipes (Red Copper Pipe/Seamless Pipe/Welding Piping)

Red copper pipe φ10X1 (31102010100010000), Seamless pipe φ50X4 (30901010040034000), Welding piping 034 (520901020720860000), Welding right angel piping 34 (520001020820860000)

Red Copper Pipe: Pure copper (high thermal conductivity); Seamless Pipe/Welding Piping: 20# carbon steel (seamless rolling/welding + heat treatment)

1. Red copper pipe deformation caused by collision and improper bending; 2. Seamless pipe/welding piping corrosion and welding seam cracking caused by humid environment

1. Use a pipe bender for red copper pipe bending to avoid flattening, and fix with pipe clips; 2. Paint the surface of seamless pipe/welding piping with anti-corrosion paint every 12 months, and check welding seams regularly

4

Joints & Elbows

Joint R1 1/2-M39X2 (AF700306-0605), Anqel joint R1 1/2-F139X2 (AF700304-1502), Joint R1-M39X2 (AF700301-0703), Angel joint R1-F139X2 (AF700301-0701), Joint G1 1X2-M42X2 (AF700304-1506), Joint M16X1.5-R1/2 (320901150018010000), Elbow Dg15 (520207020150000000), Elbow Dg40 (520200020400000000), reducing nipper Rc1/2XRc1/4 (520203030440840000), Welding right angel joint M60X2 (520001140421010000), Joint NPT1-M39X2 (520901140218020000), Joint R1 1X2XG1 1X2 (AF700304-1504), Pressure tapping MKX15-R1/4 (520901150023020000)

Joints/Elbows: 304 stainless steel (threaded joints) / 20# carbon steel (welding joints); Seal Ring: Nitrile rubber/PTFE

1. Thread wear and leakage caused by repeated disassembly and assembly; 2. Welding joint cracking caused by vibration and alternating load

1. Apply thread sealant or use Teflon tape during installation of threaded joints, and tighten with a torque wrench; 2. Inspect welding joints with NDT every 6 months, and reinforce if there are signs of fatigue

5

Pipe Sleeve & Nuts for Piping

Pipe sleeve (520901150083010000), Nut M16X1.5 (520901150069010000), Nut M42X2 (500901020830300000)

Pipe Sleeve: 304 stainless steel; Nuts: 45# carbon steel (heat treatment + galvanizing)

1. Pipe sleeve wear caused by long-term friction with the pipe; 2. Nut thread loosening caused by vibration and corrosion

1. Apply lubricating grease between the pipe sleeve and the pipe to reduce friction; 2. Use spring washers with nuts to enhance anti-loosening performance, and check tightness every 7 days

6

Pipe Clip Assemblies

Pipe clip assembly (AF700304-150300), Hood I (AF700306-060300/AF700306-060400), Pipe clip assembly 538 (AF700301-070500), Pipe clip assembly (AF700301-0715), Pipe clip assembly (T005-001.00)

Pipe Clip Body: Q235B carbon steel (galvanizing); Rubber Pad: Nitrile rubber (anti-vibration); Fastening Parts: 40Cr alloy steel

1. Rubber pad aging and loss of anti-vibration performance caused by high temperature; 2. Pipe clip deformation caused by excessive clamping force

1. Replace the rubber pad every 12 months, and avoid direct contact between the pipe clip and high-temperature components; 2. Control the clamping torque during installation to avoid damaging the pipeline, and check the pipe clip fixing status regularly

1

Bolts

M12X90 (420101121112009000), M16X45 (420201081116045000)

42CrMo alloy steel (heat treatment); Thread: Precision rolling; Surface: Galvanizing

1. Thread wear caused by repeated disassembly and assembly; 2. Bolt fatigue and fracture caused by long-term vibration

1. Apply anti-rust lubricating oil on the thread during installation, and use a torque wrench to control the tightening force (M12: 35-40N·m; M16: 60-65N·m); 2. Check the bolt tightness every 7 days, and replace bolts with signs of fatigue

2

Spring Washers

Spring washer 12 (420503016121600000), Spring washer 16 (420503011161600000)

65Mn steel (heat treatment); Surface: Phosphating

1. Fatigue and loss of elasticity caused by long-term compression; 2. Corrosion caused by humid environment and oil contamination

1. Replace the spring washer every 6 months, and check the elasticity regularly; 2. Store spare washers in a dry environment, and apply anti-rust oil after disassembly

3

Washers (Topper/Copper/Ring)

Topper washer (7001-1702), Copper washer (7001-1701), Ring washer 48 (530402048001020000)

Topper Washer: Q235B carbon steel (galvanizing); Copper Washer: Red copper (annealing treatment); Ring Washer: 304 stainless steel

1. Deformation and loss of sealing performance caused by excessive clamping force; 2. Copper washer oxidation caused by long-term contact with air

1. Control the clamping torque during installation to avoid over-tightening; 2. Replace the copper washer every time it is disassembled, and store in a sealed and dry environment to prevent oxidation

4

O-rings

O-ring 35 x 3.1 (530301190350031000), O-ring 30 x 3.1 (530301190300031000), O-ring 45 x 3.1 (530301190450031000)

Nitrile rubber (NBR); Hardness: 70±5 Shore A; Comply with HG/T 2579-2008 standard

1. Aging and cracking caused by high temperature and oil erosion; 2. Damage caused by improper installation (scratching by sharp edges)

1. Control the lubricating system temperature ≤ 80℃, and use oil-resistant hydraulic oil that meets the specification; 2. Remove sharp edges at the installation position, and apply a thin layer of lubricating oil on the O-ring before installation

5

Plug Screw

M20X1.5 (AF700303-1105)

45# carbon steel (heat treatment); Thread: Precision rolling; Surface: Galvanizing

1. Thread wear caused by repeated disassembly and assembly; 2. Sealing failure caused by thread loosening and corrosion

1. Apply thread sealant during installation to enhance sealing performance; 2. Check the tightness every 15 days, and replace if thread damage or corrosion is found