Luffing System

Assembly

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Topping winch and rope set that raise and lower the boom to change radius.

Direct parts	4
Total parts	49
Used in	1 assembly
Class	Assembly

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Topping winch and rope set that raise and lower the boom to change radius. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Luffing System parts and their functions

4 top-level parts · 49 parts in total · full bill of materials below

Luffing System parts diagram: 1 luffing winch, 2 topping rope, 3 bridle block, 4 boom stay pendant. 49 parts in 4 top-level items. — Luffing System parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.

#	Part	Qty	What it does
1	Luffing Winch 7 parts	1×	Geared drum that pays the topping rope in and out under boom load.
2	Topping Rope	1×	Boom hoist rope
3	Bridle Block 4 parts	1×	Sheave block at the mast cap
4	Boom Stay Pendant	1×	Pendant back stay

3D model

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Build & assembly graph

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Bill of materials for Luffing System

4 top-level lines · 19 rows shown · 49 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Luffing Winch 7 parts	derrick-crane-luffing-winch	1×	1	36	assembly
1.1	Winch Drum	derrick-crane-winch-drum	1×	1	·	part
1.2	Gearbox Housing	gearbox-housing	1×	1	·	part
1.3	Helical Gear Pair	gear-pair	2×	2	·	part
1.4	Band Brake	derrick-crane-band-brake	1×	1	·	part
1.5	Winch Drive Motor 4 parts	derrick-crane-drive-motor	1×	1	25	assembly
1.5.1	Stator Assembly 3 parts + deeper ›	stator-assembly	1×	1	3	assembly
1.5.2	Rotor Assembly 4 parts + deeper ›	rotor-assembly	1×	1	19	assembly
1.5.3	Ball Bearing	ball-bearing	2×	2	·	part
1.5.4	Motor Holding Brake	derrick-crane-motor-brake	1×	1	·	part
1.6	Ball Bearing	ball-bearing	4×	4	·	part
1.7	Oil Seal	oil-seal	2×	2	·	part
2	Topping Rope	derrick-crane-topping-rope	1×	1	·	part
3	Bridle Block 4 parts	derrick-crane-bridle-block	1×	1	11	assembly
3.1	Bridle Sheave	derrick-crane-bridle-sheave	3×	3	·	part
3.2	Sheave Axle Pin	derrick-crane-sheave-pin	1×	1	·	part
3.3	Ball Bearing	ball-bearing	6×	6	·	part
3.4	Block Shell	derrick-crane-block-shell	1×	1	·	part
4	Boom Stay Pendant	derrick-crane-boom-stay	1×	1	·	part

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Where the luffing system is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Construction & Earthmoving 1 Stiffleg Derrick Crane

Used in 1 assembly

Stiffleg Derrick Crane

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work

Vendor	HQ	Specialty	MOQ	Lead time
🇨🇳Foxconn foxconn.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Flex (Singapore) flex.com ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks
🇮🇳Dixon Technologies dixoninfo.com ↗	Noida, IN	Electronics contract mfg	1,000 pcs	6–10 wks
🇨🇳BYD Electronics bydelectronic.com ↗	Shenzhen, CN	Electronics contract mfg	1,000 pcs	6–10 wks
🇸🇬Venture Corp venture.com.sg ↗	Singapore	Electronics contract mfg	1,000 pcs	6–10 wks