JC-70DB7 Drawworks Maintenance Parts

1. Introduction

1.1 Product Overview & Core Application

This comprehensive maintenance parts list is exclusively engineered for the JC-70DB7 Drawworks—a critical piece of drilling equipment widely used in onshore and offshore oil & gas operations, including those by BOMCO and other major drilling contractors. The parts portfolio covers all key subsystems of the JC-70DB7 Drawworks, such as the drum shaft assembly, gear reducer (compatible with SKF and Harbin bearings), disc brake system, automatic driller gearbox, oil lubrication system, and electrical control units. Each component is precision-manufactured to match the original equipment specifications, adhering to strict industry standards including GB/T (Chinese National Standard), JB/T, API 7K (Drilling and Production Equipment), and ATEX for explosion-proof parts.

The core purpose of these parts is to support proactive maintenance, minimize unplanned downtime, and ensure the JC-70DB7 Drawworks operates at peak performance and safety. Targeted at drilling contractors, maintenance teams, and oilfield operation managers, the list addresses critical pain points—such as wear on brake components, bearing failure in gear reducers, and seal deterioration in hydraulic systems—by providing genuine, compatible parts that meet the drawworks’ high-load, high-vibration operational demands.

1.2 Key Functions & Structural Features

1.2.1 Core Functions

The parts fulfill five essential functional roles for the JC-70DB7 Drawworks: 1) Power Transmission & Load Bearing: Bearings (e.g., 23148CA/W33, 22340CC/W33) and drum couplings ensure stable torque transfer and support heavy loads during drill string hoisting; 2) Braking & Safety Control: Explosion-proof valves, brake blocks, and hydraulic components (plunger pumps, overflow valves) deliver reliable stopping power and comply with oilfield safety regulations; 3) Lubrication & Seal Protection: Oil seals, O-rings (per GB3452.1, GB1235), and filter cores prevent oil leakage, reduce friction, and maintain fluid cleanliness; 4) Electrical Control & Explosion Protection: Ex-proof motors, contactors, and sensors ensure safe operation in hazardous zones (Zone 1/2) common in oilfields; 5) Fastening & Connection: Bolts, nuts, and couplings (per JB982) provide secure assembly and resistance to vibration-induced loosening.

1.2.2 Structural Features

All parts feature industry-optimized structural designs to withstand the JC-70DB7 Drawworks’ harsh operating conditions: 1) High Load Capacity: Spherical roller bearings (23148CA/W33, 22340CC/W33) and cylindrical roller bearings (NU2228ECML) are engineered for heavy radial and axial loads, with cage designs that reduce friction and heat generation; 2) Explosion-Proof Performance: Electrical components (e.g., MFH-3-1/8-EXD24 solenoid valve, YB802-435 motor) meet ATEX and IECEx standards, preventing ignition in flammable gas environments; 3) Sealing Reliability: Oil seals (PD series, TC series) and O-rings use nitrile rubber and fluorocarbon materials, ensuring resistance to hydraulic oil, high temperatures (up to 120℃), and pressure (up to 100MPa); 4) Vibration Resistance: Fasteners (M36 bolts, locknuts) and pressure gauges (YN-60) are designed to withstand continuous vibration, with anti-loosening features and shock-absorbing structures; 5) Interchangeability: All parts match the JC-70DB7’s original design, enabling direct replacement without modifications to the drawworks’ structure.

1.3 Applicable Working Conditions

These maintenance parts are optimized for the JC-70DB7 Drawworks’ typical operating environments in oil & gas fields: 1) Onshore High-Load Operations: Bearings and brake components handle heavy hoisting loads (up to 700kN) in conventional oilfields, with heat-resistant materials to cope with ambient temperatures of -20℃ to 50℃; 2) Humid/Coastal Environments: Zinc-plated fasteners and corrosion-resistant seals prevent rust and deterioration from salt spray and high humidity; 3) Hazardous Gas Zones: Explosion-proof electrical parts and valves ensure safe operation in H₂S and hydrocarbon-rich environments, complying with API RP 500 for zone classification; 4) High-Vibration Scenarios: Vibration-proof pressure gauges (Y-60N) and shock-absorbing couplings minimize component damage from continuous drawworks operation; 5) Long-Duration Drilling: Wear-resistant brake blocks (AF700104-030103) and filter cores (HX-250X180W) extend service intervals, reducing maintenance frequency during extended drilling campaigns.

1.4 Maintenance & Care Recommendations

To maximize the lifespan of the JC-70DB7 Drawworks and its components, follow these industry-best maintenance practices: 1) Regular Inspection & Replacement: Inspect bearings (gear reducer, drum shaft) every 2,000 operating hours for wear or abnormal noise; replace brake blocks when thickness is less than 5mm (typically after 1,500 hours of heavy use); 2) Lubrication Management: Use ISO VG 32 or VG 46 hydraulic oil for the brake system; replace oil-filter cores (TFX-63X100, HDX-63X30) every 500 hours; ensure O-rings are lubricated with compatible grease before installation to prevent damage; 3) Electrical System Maintenance: Clean explosion-proof connectors quarterly to remove dust and oil; test ex-proof sensors (WZP-24SA) and contactors (LC1-D0912M6C) annually for continuity and proper operation; 4) Seal & Leakage Checks: Inspect oil seals (PD260X300X20, TC series) monthly for leakage; replace O-rings at the first sign of cracking or hardening, using parts that comply with GB3452.1/GB1235 standards; 5) Fastener Torque Checks: Retorque M36 bolts (AF700303 series) and locknuts every 300 hours to the manufacturer’s specification (450-500 N·m) to prevent vibration-induced loosening.

Maintenance parts for  JC-70DB7 Drawworks

1 Bearing 23148CA/W33 430103002314800012 GB/T288 Ф240XФ400X128 2 pcs Drum shaft assy.

2 Oil seal PD260X300X20 530301142603002024 2 pcs Ditto

3 Water gas instrumentation AF0000010600 1 set Ditto

4 Water gas coupling AF0000030100 1 set Ditto

5 Rope T105-001.00 2 set drawworks

6 Rope clamp φ38 T100-006.00 1 pc Ditto

7 Push plate clutch (ATD327) WG00920831 1 pc Auto driller

8 Friction plate (inner and outer) WG00920832 4 each Push plate clutch

9 Bladder WG00920833 2 pcs Ditto

10 Joint NPT1/2-M27X1.5 AF700303-1501 6 pcs Auto driller

11 Right angle connector NPT1/2-M27X1.5 AF700303-1502 6 pcs Ditto

12 Hose 16I- 140507011601000010 6 pcs Ditto

13 O-ring 20X2.4 530301010200024008 12 pcs Ditto

14 Oil seal PD100X130X12 AF700201-01042009 8 pcs Water gas instrumentation and coupling

15 Oil seal PD40X65X12 530301140400651224 10 pcs Ditto

16 Oil seal PD50X70X12 530301140500701224 4 pcs Ditto

17 O-ring 90X5.3 530301010900053001 4 pcs Ditto

18 Bearing 6218 430107000621800000 GB/T276 Ф90XФ160X30 4 pcs Ditto

19 Bearing 6208 430107000620800000 GB/T276 Ф40XФ80X18 12 pcs Ditto

20 Oil overflow nozzle T007-001.00 4 pcs Ditto

21 Oil cup M10×1（direct type）061302011152101000 20 pcs Ditto

22 Ventilation plug R1/2 AF400103-070113 4 pcs Ditto

23 Seal AF700201-01042006 20 pcs Ditto

24 45° bend Rc1 1/4 520207060400320003 2 pcs Drum shaft

25 Right angle connector Rc3/4-M52X2 AF700303-021900 2 pcs Ditto

26 Bearing 22340CC/W33 430103002234000014 Ф200XФ420X138 2 pcs Gear reducer SKF

27 Bearing 23248CA/W33 430103002324800015 Ф240XФ440X160 2 pcs Ditto Haerbin

28 Bearing 22334CA/W33 430103002233400015 Ф170XФ360X120 2 pcs Ditto Haerbin

29 Bearing QJ228N2MA 439901010010620000 Ф140XФ250X42 1 pc Ditto SKF

30 Bearing NU2228ECML 439901010010650000 Ф140XФ250X68 2 pcs Ditto SKF

31 Bearing NU2336M 439901010010660000 Ф180XФ380X126 1 pc Ditto Haerbin

32 O-RING 136×3.55 530301011360035501 10 pcs Ditto

33 O-RING 165×3.55 530301011650035501 4 pcs Ditto

34 O-RING 175×3.55 530301011750035501 4 pcs Ditto

35 O-RING 224×5.3 530301012240053001 4 pcs Ditto

36 O-RING 250×5.3 530301012500053001 10 pcs Ditto

37 O-RING 236×5.3 530301012360053001 4 pcs Ditto

38 O-RING 450×7 530301012360053001 10 pcs Ditto

39 O-RING 425×7 530301014250070001 10 pcs Ditto

40 O-RING 365×7 530301013650070001 4 pcs Ditto

41 O-RING 387×7 530301013870070009 4 pcs Ditto

42 O-RING 412×7 530301014120070001 4 pcs Ditto

43 Air filter C-M90×2 4 pcs Ditto

44 Pressure sensor BSCYG9010-1.0 380210100010000000 1 pc Oil lubrication

45 Vibration proof pressure gauge Y-60N 0~1.6MPa 380202051160006038 2 pcs Ditto

46 Gear pump device LBZ-125BSC 512601010072012515 1 pc Ditto

47 O-ring Φ50×3.1 530301190600031001 10 pcs Ditto

48 O-RING Φ45×3.1 530301190450031001 20 pcs Ditto

49 Red copper pipe Φ10×1 051102010100010002 5 m Ditto

50 Choke valve MG30G1.2 512604100700273000 1 pc Ditto

51 Combined washer 48 530402048001020000 10 pcs Ditto

52 O-RING Φ35×3.1 530301190350031001 20 pcs Ditto

53 Stainless steel ball valve Rc1 1/2 441205010016380373 2 pcs Ditto

54 O-RING Φ30×3.1 530301190300031001 20 pcs Ditto

55 Filter core HX-250X180W 512605510072501803 6 pcs Ditto

56 EX-proof two position three way reversal valve DK-1832/WGH 512704240000290000 2 pcs Disc brake

57 Ex-proof proportional braking valve KGZA/M-031/BT 512704900000016000 1 pc Ditto

58 Electric control unit of braking valve E-MEACO1F/TLP23L/S 330701010000010000 1 pc Ditto

59 Ex electric-fluid reversal valve DPHUA-2714/PA-GK24DC/WG 512604240200032703 1 pc Ditto

60 Ex proof single electric control electromagnetic valve MFH-3-1/8-EXD24 512704140000080000 2 pcs Ditto

61 Ex proof single electric control electromagnetic valve MOFH-3-1/8-EXD24 512704151500020300 1 pc Ditto

62 Air control reversal valve VL-5-1/8-B 512704260400060602 1 pc Ditto

63 Shuttle valve OS-1/8-B 512704110400100302 1 pc Ditto

64 Plastic air tube PUN-6x1-S1 150204120020200701 20 m Ditto

65 Normal open brake KG-80 WG05211104 2 pcs Ditto

66 Normal close brake BG-80B WG05211111 2 pcs Ditto

67 Brake block (shoe plate) AF700104-030103 100 pcs Ditto

68 O-RINGGB3452.1）21.2×2.65 530301010212026501 20 pcs Ditto

69 O-RING GB3452.1）25.8×2.65 530301010258026501 20 pcs Ditto

70 O-RING （GB3452.1）42×3.55 530301010420035501 20 pcs Ditto

71 Combined washer (JB982) 14 530402020001014000 20 pcs Ditto

72 Combined washer (JB982) 27 530402020001027000 20 pcs Ditto

73 Combined washer (JB982) 33 530402020001033000 20 pcs Ditto XJ-L15

74 Combined washer (JB982) 42 530402020001042000 20 pcs Ditto

75 Combined washer (JB982) 48 530402020001048000 20 pcs Ditto

76 O-RING （GB1235）8×1.9 530301190080019001 50 pcs Ditto

77 O-RING （GB1235）12×1.9 530301190120019001 50 pcs Ditto

78 O-RING （GB1235）16×2.4 530301190160024001 50 pcs Ditto

79 O-RING （GB1235）20×2.4 530301190200024001 50 pcs Ditto

80 O-RING （GB1235）24×2.4 530301190240024001 50 pcs Ditto

81 O-RING （GB1235）30×3.1 530301190300031001 50 pcs Ditto

82 O-RING （GB1235）35×3.1 530301190350031001 50 pcs Ditto

83 O-RING （GB1235）45x3.1 530301190450031001 50 pcs Ditto

84 O-RING （GB1235）65x3.1 530301190650031001 50 pcs Ditto

85 Hose connector Φ16XΦ28 520901150004020000 4 pcs Drawworks air control

86 Hose connector Φ10XΦ19 520901150003020000 4 pcs Ditto

87 Joint R1/2-M22X1.5 520901150010020000 4 pcs Ditto

88 Joint R1/4-M16X1.5 520901150009020000 4 pcs Ditto

89 Joint R1/2-M16X1.5 520901150016020000 6 pcs Ditto

90 Filter 512605520100200000 2 pcs Ditto

91 O-matic valve FP-L6A 512704070200050600 3 pcs Ditto

92 Union Rc1 520201040400250002 1 pc Ditto

93 Joint NPT1/4-M16X1.5 520901150013020000 1 pc Ditto

94 Right angle connector NPT1/4-M16X1.5 520901150053020000 1pc Ditto

95 Nut M16X1.5 520901150069020000 6 pcs Ditto

96 Cutting sleeve 10 520901150083020000 6 pcs Ditto

97 Nut M22X1.5 520901150071020000 6 pcs Ditto

98 Cutting sleeve 16 520901150086020000 6 pcs Ditto

99 Joint M22X1.5-R3/4 T001-0110 1 pc Ditto

100 Air hose Φ10XΦ19 140501050100100000 100m m Ditto

101 Air hose Φ16XΦ28 140501050160100000 10m m Ditto

102 Pressure switch PEV-1/4-B 512604051500030000 2 pcs Ditto

103 Shuttle valve OS-1/4-B 512704110400070602 2 pcs Ditto

104 Fast release valve NPT1/2 512704070600100000 2 pcs Ditto

105 Rotary air coupling 520902900200003015 3 pcs Ditto XJ-L15

106 Joint NPT1/2-M22X1.5 520901150014020000 2 pcs Ditto

107 Air horn QF66-GF74 561122090000010100 2 pcs Ditto

108 Right angle connector QSL-1/4-10 520902040102200600 2 pcs Ditto

109 Straight coupling QS-1/4-10 520902040101400600 2 pcs Ditto

110 Straight coupling QS-3/8-12 520902040104500900 2 pcs Ditto

111 Right angle connector QSL-3/8-10 520902040103700900 2 pcs Ditto

112 Tee QST-10 520902040100400800 2 pcs Ditto

113 Joint QSSF-1/4-10-B 520902040102000600 2 pcs Ditto

114 Joint QSSF-1/2-12-B 520902040101901200 2 pcs Ditto

115 Straight coupling QS-1/2-12 520902040101701200 2 pcs Ditto

116 Hose PAN-L12X1.75 150204120020100500 10 m Ditto

117 Hose PAN-L10X1.5 150204120020200200 10 m Ditto

118 Single valve piece H of valve terminal CPV18-M1H-30LS-3GLS-1/4 176070 2 pcs Ditto

119 Single valve piece C of valve terminal CPV18-M1H-2X3-GLS-1/4 163189 2 pcs Ditto

120 Bearing GB297-94/32319 1 pc Auto driller gearbox

121 Bearing GB297-94/30319 1 pc Ditto

122 Bearing GB297-94/32318 2 pcs Ditto

123 Bearing GB297-94/32044 2 pcs Ditto

124 Bearing GBT276-94/ 6220-Z 1 pc Ditto

125 Bearing GBT283-94/NJ220E 1 pc Ditto

126 Oil seal TC210*250*16 2 pcs Ditto

127 Oil seal TC100*125*13 1 pc Ditto

128 Oil seal TC80*110*12 1 pc Ditto

129 Retainer GB894.2-86 /B type 100 1 pc Ditto

130 Retainer GB894.2-86 /B type 38 1 pc Ditto

131 Retainer GB893.1-86 /A type 180 2 pcs Ditto

132 Bolts M36×160 AF700303-37 20 pcs Fastening pieces BOMC O

133 Bolts M36×120 AF700303-20 16 pcs Ditto BOMC O

134 Bolts M36×125 AF700303-12 14 pcs Ditto BOMC O

135 Locknut M36-8-Zn.D 420421016360400000 34 pcs Ditto BOMC O

136 Nut M36-6-Zn.D 420402016360300000 16 pcs Ditto BOMC O

137 Nut M36-8-Zn.D 420402026360400000 16 pcs Ditto BOMC O

138 Oil-filter core TFX-63X100 2 pcs Disc brake HPU

139 Oil-filter core SPX-06X25 1 pcs Disc brake HPU

140 Oil-filter core HDX-63X30 1 pcs Disc brake HPU

141 Quake proof gauges YN-60 1 pcs Disc brake HPU

142 O-ring 11X1.9 GB1235-76 10 pcs Disc brake HPU

143 O-ring 20X2.4 GB1235-76 10 pcs Disc brake HPU

144 O-ring 24X2.4 GB1235-76 10 pcs Disc brake HPU

145 O-ring 30X3.1 GB1235-76 5 pcs Disc brake HPU

146 O-ring 240X5.7 GB1235-76 2 pcs Disc brake HPU

147 O-ring 5X1.8 GB3452.1-92 2 pcs Disc brake HPU

148 O-ring 48X3.55 GB3452.1-92 2 pcs Disc brake HPU

149 Combined washer 14 JB982-77 10 pcs Disc brake HPU

150 Combined washer 18 JB982-77 10 pcs Disc brake HPU

151 Combined washer 22 JB982-77 10 pcs Disc brake HPU

152 Combined washer 27 JB982-77 10 pcs Disc brake HPU

153 Combined washer 33 JB982-77 10 pcs Disc brake HPU

154 Plunger pump PHP1050R 1 pcs Disc brake HPU

155 Gear pump CEF-E25P 1 pcs Disc brake HPU

156 Ex-proof motor 160v,60Hz YB802-435 0.75KW 1 pcs Disc brake HPU

157 Shaft coupling NL3 YA28X62/YA19.05X40 2 pcs Disc brake HPU

158 Shaft coupling NL2 YA19X40/YA20X40 1 pcs Disc brake HPU

159 Overflow valve DB10-1-30/100 1 pcs Disc brake HPU

160 Explosion-proof hot resistance WZP-24SA T4 1 pcs Disc brake HPU

161 Liquid level relay YKJD24-300 1 pcs Disc brake HPU

162 cooler GLC1-0.6 1 pcs Disc brake HPU

163 High pressure ball valve BKH -1/2NPT 1 pcs Disc brake HPU

164 Low pressure ball valve 3/4 3 pcs Disc brake HPU

165 Tertiary breaker NSC125D/3160 63A 60Hz 1 pcs Disc brake HPU

166 AC Contactor LC1-D0912M6CAC220V 60Hz 3 pcs Disc brake HPU

167 AC Contactor LC1-D1810M6CAC220V 60Hz 1 pcs Disc brake HPU

168 thermal relay LR2-D11307C 1.6-2.5A 1 pcs Disc brake HPU

169 thermal relay LR2-D11310 4-6A 2 pcs Disc brake HPU

170 Auxiliary contactor LA2-DN22C 4 pcs Disc brake HPU

171 Control transformer JBK5-250 460V/220V 1 pcs Disc brake HPU

172 relay HH54P 1 pcs Disc brake HPU

173 Temperature control instrument XMTA-2202 1 pcs Disc brake HPU

174 24V Power Supply S-100-24/inAC220VoutDC24V 1 pcs Disc brake HPU

175 Explosion-proof switch 8036/B 4 pcs Disc brake HPU

176 Explosion-proof switch 8036/B（LOCK）2 pcs Disc brake HPU

177 Ex-proof indicator DC24V（M27X1.5）9 pcs Disc brake HPU

178 Fuse seat RT18-32 14 pcs Disc brake HPU

179 Fuse core 32A 2 pcs Disc brake HPU

180 Fuse core 16A 6 pcs Disc brake HPU

181 Fuse core 10A 3 pcs Disc brake HPU

182 Fuse core 6A 1 pcs Disc brake HPU

183 Fuse core 3A 2 pcs Disc brake HPU

184 Drum coupling I WG05115201 2 set drawworks

185 Drum coupling II WG05115001 2 pcs drawworks

186 Bolt M36x160 AF700303-37 20 pcs Fastening piece bomco

187 Bolt M36x120 AF700303-20 32 pcs Fastening piece bomco

188 Bolt M36x125 AF700307-12 14 pcs Fastening piece bomco

189 Block Nut M36-8-Zn.D 420421016360400000 34 Pcs Fastening piece bomco

190 Nut M36-6-Zn.D 420402016360300000 32 pcs Fastening piece bomco

191 Nut M36-8-Zn.D 420402026360400000 32 pcs Fastening piece bomco

2. Field Fault Repair Cases

Case 1: Gear Reducer Bearing Failure in JC-70DB7 Drawworks (Onshore Oilfield)

Scenario: A BOMCO drilling team encountered abnormal noise and overheating in the gear reducer of their JC-70DB7 Drawworks during drill string hoisting. The issue escalated to reduced load capacity, threatening drilling progress.

Troubleshooting & Repair: Inspection revealed damage to the 22340CC/W33 spherical roller bearing (SKF) due to insufficient lubrication and contamination. The team replaced the bearing with a genuine part from the list, flushed the gear reducer, refilled with ISO VG 46 gear oil, and replaced the oil-filter core (SPX-06X25). Additionally, the ventilation plug (R1/2 AF400103-070113) was cleaned to ensure proper heat dissipation. Post-repair, the gear reducer operated smoothly, with no abnormal noise or overheating.Preventive Measure: Check gear oil level weekly and replace lubricant every 4,000 operating hours; install a secondary filter to reduce contamination.

Case 2: Disc Brake Hydraulic Leakage in JC-70DB7 Drawworks (Coastal Gas Field)

Scenario: A coastal drilling operation reported hydraulic fluid leakage in the disc brake system of their JC-70DB7 Drawworks, leading to reduced braking efficiency and safety concerns in the humid, salt-rich environment.

Troubleshooting & Repair: Leakage was traced to deteriorated O-rings (224×5.3 GB3452.1) and a faulty overflow valve (DB10-1-30/100). The team replaced the O-rings with corrosion-resistant genuine parts, installed a new overflow valve, and flushed the hydraulic circuit. The brake blocks (AF700104-030103) were also inspected and replaced as a precaution. Anti-corrosion spray was applied to the hydraulic connectors to prevent future salt-induced damage. Preventive Measure: Inspect hydraulic seals monthly in coastal environments; use silicone-based grease to protect O-rings from salt spray.

3. FAQ

4. Procurement Guidance & Call to Action

As a trusted supplier of JC-70DB7 Drawworks maintenance parts, we prioritize quality, compatibility, and compliance with global oilfield standards. Our parts are sourced from certified manufacturers, with full traceability documentation to meet API 7K, GB/T, and ATEX requirements—ensuring they perform reliably in the JC-70DB7’s high-demand operating conditions.

We understand the critical role of genuine parts in minimizing downtime and maximizing safety for drilling operations. Our portfolio is curated to cover all maintenance needs of the JC-70DB7, from routine replacements (O-rings, filter cores) to critical components (bearings, brake systems). We offer flexible procurement options, including bulk ordering for long-term maintenance plans and urgent replacements for unexpected failures, backed by comprehensive technical documentation and compatibility verification.

Whether you are managing a fleet of JC-70DB7 Drawworks or need targeted parts for maintenance, our team is ready to support your needs. We provide pre-purchase compatibility checks, maintenance advisory services, and access to technical experts who understand the unique challenges of oilfield drawworks operation. Choose our genuine parts to ensure your JC-70DB7 Drawworks maintains peak performance, safety, and operational continuity.

Contact us today to discuss your specific procurement requirements. We will work with you to optimize your parts inventory, reduce maintenance costs, and keep your drilling operations on track—backed by a commitment to quality and reliability that aligns with the highest industry standards.

contact us ：

Emeil: [email protected]   whatsapp: +86 15275658619

Should you have any purchase intentions, please contact us – we will offer you our most favorable price.