BOMwiki the bill-of-materials encyclopedia
30,454,201 parts mapped · 193,225 items
Discussion History

Undercarriage

Assembly

Welded track-frame base with two driven crawler tracks. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Undercarriage parts and their functions

15 top-level parts · 1,362 parts in total · full bill of materials below
Undercarriage parts diagram: 1 track frame, 2 track chain, 3 drive sprocket, 4 front idler, 5 track roller, 6 carrier roller, 7 track tension cylinder, 8 final drive, 9 track shoe bolt & nut, 10 roller mounting bolt, 11 track guard, 12 grease fitting, 13 final drive bolt, 14 hex bolt, 15 hex nut. 1,362 parts in 15 top-level items.
Undercarriage parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Track Frame 2× Left + right
2 Track Chain 4 parts 2×
3 Drive Sprocket 2×
4 Front Idler 2×
5 Track Roller 14× Bottom rollers
6 Carrier Roller 4× Top rollers
7 Track Tension Cylinder 4 parts 2×
8 Final Drive 5 parts 2× Travel motor + planetary
9 Track Shoe Bolt & Nut 400× four per shoe
10 Roller Mounting Bolt 144× Bolt fastening a track or carrier roller to the track frame.
11 Track Guard 4× Steel guard keeping the chain aligned on the frame.
12 Grease Fitting 24× Lubrication nipple on a pin, bushing or bearing.
13 Final Drive Bolt 48× Bolt mounting the final drive and sprocket to the track frame.
14 Hex Bolt 200× Flanged hex bolt, M8 to M24, used throughout the structure, covers and equipment mounts.
15 Hex Nut 120× Flanged or nyloc hex nut mating the bolts.

3D model

No 3D model yet. Have a CAD file of this? Add a 3D model. STL renders right on this page; STEP, FreeCAD, and OpenSCAD sources are welcome too (openly licensed, like all 3D models on BOMwiki).

Build & assembly graph

expand / collapse · shared sub-assemblies converge · links to related products · est. labour
product / assembly shared across products atomic part related product

Tap an assembly to expand/collapse · tap a part to open it · use “Open page” for any node · drag to pan, scroll to zoom.

Bill of materials for Undercarriage

15 top-level lines · 28 rows shown · 1,362 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Track Frame excavator-track-frame 2× 2 · part
2 Track Chain 4 parts excavator-track-chain 2× 2 184 assembly
2.1 Track Link excavator-track-link 46× 92 · part
2.2 Steel Track Shoe excavator-track-shoe 46× 92 · part
2.3 Track Pin excavator-track-pin 46× 92 · part
2.4 Track Bushing excavator-track-bushing 46× 92 · part
3 Drive Sprocket excavator-sprocket 2× 2 · part
4 Front Idler excavator-idler 2× 2 · part
5 Track Roller excavator-track-roller 14× 14 · part
6 Carrier Roller excavator-carrier-roller 4× 4 · part
7 Track Tension Cylinder 4 parts excavator-track-tension-cylinder 2× 2 5 assembly
7.1 Hydraulic Cylinder Tube excavator-cylinder-tube 1× 2 · part
7.2 Cylinder Piston Rod excavator-cylinder-piston-rod 1× 2 · part
7.3 Oil Seal oil-seal 2× 4 · part
7.4 O-Ring Set oring-set 1× 2 · part
8 Final Drive 5 parts excavator-final-drive 2× 2 10 assembly
8.1 Travel Motor excavator-travel-motor 1× 2 · part
8.2 Helical Gear Pair gear-pair 3× 6 · part
8.3 Gearbox Housing gearbox-housing 1× 2 · part
8.4 Oil Seal oil-seal 2× 4 · part
8.5 Ball Bearing ball-bearing 3× 6 · part
9 Track Shoe Bolt & Nut excavator-track-bolt 400× 400 · part
10 Roller Mounting Bolt excavator-roller-bolt 144× 144 · part
11 Track Guard excavator-track-guard 4× 4 · part
12 Grease Fitting excavator-grease-fitting 24× 24 · part
13 Final Drive Bolt excavator-final-drive-bolt 48× 48 · part
14 Hex Bolt excavator-hex-bolt 200× 200 · part
15 Hex Nut excavator-hex-nut 120× 120 · part

Something wrong in this list? Report a problem with this BOM.

Where the undercarriage is used

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

Used in 1 assembly

Excavator

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
VendorHQSpecialtyMOQLead 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