1. Core Overview & Target Application Brief

This comprehensive spare parts catalog is precision engineered exclusively for the DQ-450DBZ top-drive drilling system equipped with SCR/VFD electronic control system, a heavy-duty 450-tonne rated top-drive unit designed for high-efficiency onshore and offshore drilling operations. Tailored to the specialized needs of top-drive maintenance technicians, rig electricians, drilling operations supervisors, oilfield service contractors, and hydraulic system specialists, this parts suite directly addresses the most costly and disruptive field pain points: hydraulic system leaks, electrical control signal failures, brake mechanism wear, pipe handling assembly malfunctions, and unplanned drilling downtime caused by worn or incompatible components.

2. Detailed Product & Component Specifications

The DQ-450DBZ top-drive spare parts line features heavy-duty, wear-resistant mechanical, hydraulic, and electronic components built to withstand extreme rig vibration, high-pressure hydraulic loads, abrasive drilling conditions, and continuous operational stress. Each part—spanning pipe handling assemblies, hydraulic cylinders, valve blocks, brake mechanisms, precision filters, VFD/SCR control modules, PLC processors, explosion-proof connectors, and industrial seals—is crafted from premium materials: forged alloy steel for load-bearing components, oil-resistant nitrile/FKM rubber for seals, high-grade copper for electrical contacts, and industrial-grade filtration media (10μm precision) for hydraulic systems. All critical parts are machined to a dimensional accuracy of ±0.003 inches, ensuring direct interchangeability with original DQ-450DBZ top-drive hardware without modification.

We supply the following spare parts:

Item No.		Part number	Spare part name	UOM
1		P/N: DQ004.01.00	Pipe handling manipulator assembly	set
2		P/N: DQ004.02.00	BOP stack	set
3		P/N: HG180	Link tilt cylinder 90/63-660×1000-R/R	set
4		P/N: DQ004.04.00	Feed pipe assembly	set
5		P/N: DQ004.05.00	Balance device assembly	set
6		P/N: DQ004.07.03.00	pressure switch group	set
7		P/N: TF100×100L	Filter	pcs.
8		P/N: A10V028DR/31R-PSC12 K01	Plunger pump	set
9		P/N: 32-720J42D1-F20C9	Hose assembly	set
10		P/N: JCFL-1.45/4.22	Air cooling mechanism	set
11		P/N: SP-10×25	Return filter	pcs.
12		P/N: QUQ1-10×1	Air filter	pcs.
13		P/N: 8-950J22C1-J22C4	Hose assembly	set
14		P/N: DQ004.07.06.00	Two-way safety valve assembly	set
15		P/N: DQ004.07.07.00	Balance valve block assembly	set
16		P/N: DQ004.07.08.00	Safety valve block assembly	set
17		P/N: DQ004.12.10	Brake disc	set
18		P/N: DQ019.13.06.00	Friction mechanism	set
19		P/N: 2K305	Hydraulic motor	set
20		P/N: SKD80	Brake mechanism	set
21		P/N: 2D9-42RN	Pipe head fitting	pcs.
22		P/N: 6D-42LN/RN	Pipe head fitting	pcs.
23		P/N: 2C9-26	Pipe head fitting	pcs.
24		P/N: 1CN-26-12	Pipe head fitting	pcs.
25		P/N: 5N-16-12	Pipe head fitting	pcs.
26		P/N: FL-20	Pipe head fitting	pcs.
27		P/N: 1CG-26-08	Pipe head fitting	pcs.
28		P/N: 3C-26	Pipe head fitting	pcs.
29		P/N: 1DI-42RN	Pipe head fitting	pcs.
30		P/N: 1DT-42-20SP/RN	Pipe head fitting	pcs.
31		P/N: 1DH-42	Pipe head fitting	pcs.
32		P/N: 5DN-36-12	Pipe head fitting	pcs.
33		P/N: BD-42RN	Pipe head fitting	pcs.
34		P/N: 1DN-42-16	Pipe head fitting	pcs.
35		P/N: 3D-42	Pipe head fitting	pcs.
36		P/N: 1DG-42-20RN	Pipe head fitting	pcs.
37		P/N: 1D-42RN	Pipe head fitting	pcs.
38		P/N: 1CH-26-27	Pipe head fitting	pcs.
39		P/N: 1CH-22-18	Pipe head fitting	pcs.
40		P/N: DQ004.12.17	Friction bushing	pcs.
41		P/N: R01-PS	Oil seal Ø360×Ø400×20	pcs.
42		P/N: R01-PS	Oil seal Ø240×Ø270×15	pcs.
43		P/N: R01-PS	Oil seal Ø255×Ø299×20	pcs.
44		P/N: R01-PS	Oil seal Ø200×Ø230×15	pcs.
45		P/N: GTC002100	Oil seal Ø210×Ø240×15	pcs.
46		P/N: GB/T3452.1	O-ring 185×5.3	pcs.
47		P/N: DQ004.09.00	Guide rail assembly	set
48		P/N: DQ004.08.00	The guide rail and all its elements should be checked, unsuitable ones should be replaced.	set
49		1400003792	Temperature and humidity transmitter (Sensor)	pcs.
50		1400010386	Fuse, various	pcs.
51		1400004055	DP bus connector (Connector)	pcs.
52		1400003228	Switch	pcs.
53		1400002836	Intermediate relay	pcs.
54		1400002874	Intermediate relay installers.	pcs.
55		1400002588	Contactor	pcs.
56		1400002103	UPS;TG100:1KVA;AC220V;50Hz	pcs.
57		1400001923	Transformer	pcs.
58		1400009463	Speed control handwheel	pcs.
59		1400003440	potentiometer	pcs.
60		1400002875	Accessories for intermediate relay	pcs.
61		1400025636	Impulse power  source	pcs.
62		1400010729	DC voltage transmitter	pcs.
63		1400004207	Temperature indicator: NPWD-CD55D; 0-10V; 24V DC	pcs.
64		1400002268	Fan- with motor	Set
65		1400030201	Inventor	pcs.
66		1400001731	ABB Brake block	pcs.
67		1400035421	Memory card-programmed	pcs.
68		1400003598	Safety barrier	pcs.
69		1400003402	Base connector	pcs.
70		1400002744	Thermal relay	pcs.
71		1400006048	Network cable	Set
72		1400030070	19-core (socket) explosion-proof cable lug	pcs.
73		1400030063	19-core (plug) explosion-proof cable lug	pcs.
74		1400035878	19-core explosion-proof connector	pcs.
75		1400035879	42-core explosion-proof connector	pcs.
76		1400031750	19-core connector	pcs.
77		1400009354	42-core socket	pcs.
78		DQ005.13.00	Cable: CEURP/DA4×2×1.5P+6XV1830- OPH10	metre
79		DQ005.13.00	Cable: CEURP/DA4×2×1.5P+6XV1830-OPH10	metre
80		DQ005.13.00	Encoder – photoelectric HS35	pcs.
81		1300100755	Electric motor AC	pcs.
82		DQ005.13.00	Converter board BCU-X2	pcs.
83		DQ005.13.00	Power distribution block APBU-44C	pcs.
84		DQ005.13.00	DP-RPBA connector RPBA-01	pcs.
85		DQ005.13.00	SDDCS-RDCO connector RDCO-01	pcs.
86		DQ005.13.00	Power supply UN0-PS/1AC/24DC/240W	pcs.
87		DQ005.13.00	PLC main processor 6ES7；315-2EH14-0AB0	pcs.
88		DQ005.13.00	PLC module-digital input 6ES7 321-1BL00-0AA0+6ES7 392-1AM00-0AA0	pcs.
89		DQ005.13.00	PLC module-digital output 6ES7 322-1BH01-0AA0+6ES7 392-1AJ00-0AA0	pcs.
90		DQ005.13.00	PLC module-digital input 6ES7 331-7KF02-0AB0+6ES7 392-1AJ00-0AA0	pcs.
91		DQ005.13.00	PLC module-digital output 6ES7 332-5HF00-0AB0+6ES7 392-1AM00-0AA0	pcs.

3. Field Fault Repair Cases (Real-World Scenarios)

3.1 Case 1: Hydraulic Valve Block Failure (Onshore Drilling Rig)

Issue: DQ-450DBZ top-drive experienced erratic pipe handling movement and reduced hydraulic pressure, halting drilling operations. Root cause: Worn balance valve block assembly and clogged inline hydraulic filter. Repair: Replaced the valve block assembly and new filter, purged air from the hydraulic system, and pressure-tested connections. Outcome: Restored stable hydraulic flow, eliminated movement irregularities, and resumed normal pipe handling.

3.2 Case 2: VFD Control System Relay Failure

Issue: Top-drive rotary speed fluctuated uncontrollably, triggering VFD fault alarms and shutdowns. Root cause: Failed intermediate relay and loose DP bus connector in the SCR/VFD control cabinet. Repair: Installed new intermediate relays, secured the DP bus connector, and reset control parameters. Outcome: Stabilized rotary speed, cleared fault codes, and restored full VFD control functionality.

3.3 Case 3: Brake Mechanism Wear (Offshore Drilling Platform)

Issue: DQ-450DBZ top-drive brake failed to hold rotary load, creating a safety hazard during pipe makeup. Root cause: Worn brake disc and degraded friction mechanism pads. Repair: Replaced the brake disc, friction mechanism, and ABB brake block, then calibrated brake pressure. Outcome: Restored full braking capacity, ensured operational safety, and resumed drilling without delays.

4. Frequently Asked Questions (FAQ)

Question	Answer
Are these parts compatible only with the DQ-450DBZ top-drive?	Yes, all components are designed and sized exclusively for the DQ-450DBZ model with SCR/VFD electronic control; they are not interchangeable with other top-drive models without modification.
Do these parts include critical components for VFD/SCR control system repairs?	Absolutely, this catalog covers PLC modules, contactors, relays, connectors, and power supplies needed to repair and calibrate the DQ-450DBZ’s electronic control system.
How do I select the correct seal for my DQ-450DBZ top-drive?	Match the seal outer diameter, inner diameter, and thickness to the catalog listings (e.g., Ø360×Ø400×20 oil seal) and cross-reference the part number for exact OEM fit.

5. Procurement Guidance & Call to Action

This DQ-450DBZ top-drive spare parts list serves as a dual-purpose industry resource: a strict procurement standard to guarantee part quality, compatibility, and compliance with API 7K and industrial electrical safety standards, and a practical technical reference to resolve mechanical, hydraulic, and electronic failures quickly and safely. Choosing these OEM-equivalent replacement parts minimizes unplanned rig downtime, reduces long-term maintenance expenses, and preserves the reliable performance of your DQ-450DBZ top-drive system.

For all spare part inquiries, order placement, and technical verification, submit your requirements using the exact part numbers and descriptions listed in this catalog. Our technical team provides specialized support to confirm part fitment, material specifications, and subsystem compatibility for your specific repair or overhaul needs, ensuring you receive the precise components needed to restore your DQ-450DBZ top-drive to full operational condition. Build your critical spare parts inventory today to mitigate repair delays and maintain uninterrupted drilling operations.