Heavy Duty Komatsu D20 Bulldozer Bottom Roller with High Hardness

• Customization: Available
• Standard or Nonstandard: Standard
• Feature: Flame-Retardant, Anti-Static, Oil-Resistant, Cold-Resistant, Corrosion-Resistant, Heat-Resistant, Alkali-Resistant, Skid-Resistance, Wear-Resistant, Acid-Resistant, High Temperature-Resistance
• Model NO.: D20 D6C D6D D6E D21 D31 D50
• Application: Textile Machinery, Garment Machinery, Conveyer Equipment, Packaging Machinery, Electric Cars, Food Machinery, Marine, Mining Equipment, Agricultural Machinery, Car
• Surface Treatment: Polishing
• Material: 40mn2,50mn/40simnti
• Standerd: ISO 9001
• Hardness: Surface Hardness HRC50-58
• Hardened Depth: Hardened Depth 5-12mm
• Core Application: Undercarriage Parts, Track Roller for Bulldozer, C
• Color: Black and Yellow
• Warranty: 1 Year
• Function: Machinery Repair Shops, Construction Works
• Type: Single Flange Double Flange
• Transport Package: Carton Cases. Pallet or Wooden Box
• Specification: D20 D6C D6D D6E D21 D31 D50
• Trademark: SMCC or Customize
• Origin: China
• HS Code: 8431390000
• Production Capacity: 10000000pieces/Year
• Package Size: 20.00cm * 30.00cm * 30.00cm
• Package Gross Weight: 20.000kg

Product Description

Product Description

Introduction

The Bottom Roller is the core load-bearing component of the chassis system of a tracked bulldozer, mainly used to support the weight of the entire machine and guide the smooth operation of the tracks.
This product is designed specifically for Komatsu D20, D21, D31 and other series models. It is made of 50Mn alloy steel and forged as a whole. After surface induction hardening treatment, the hardness reaches HRC 52-58, and the depth of the hardened layer is 8-12mm. It has excellent wear resistance and impact resistance. Equipped with a high chromium molybdenum alloy floating oil seal, it effectively prevents sediment intrusion and lubricant leakage, significantly extending its service life.
The product has precise installation dimensions, strong load-bearing capacity, and a maximum rated load of 15 tons. It is suitable for various harsh working conditions such as mining, construction, and agriculture, and is a cost-effective alternative to original accessories.

BRAND	CATALOGUE
BULLDOZER	D20	D30	D31	D37	D40	D41	D45	D50	D60
	D65	D68	D75	D80	D85	D150	D155	D275	D355
	D3C	D3D	D4C	D4D	D4H	D5	D6C	D6D	D6H
	D7G	D8K	D8N	D9N	D10N	D11N
KOMATSU	PC30	PC40	PC45	PC60	PC75	PC100	PC120	PC150	PC200
	PC220	PC300	PC350	PC400
CATERPILLAR	E70B	E110	E120B	E215	E235	E307	E311	E312	E322
	E180	E240	E200B	E320	E300	E300B	E330	E325
HITACHI	EX30	EX40	EX60	EX100	EX120	EX200	EX220	EX270	EX300
	EX400	EX600	UH043	UH052	UH53	UH07	UH081	UH082	UH083
FIAT-HITACHI	FH120	FH130	FH150	FH200	FH220	FH270	FH300
VOLVO	EC55	EC130	EC150	EC200	EC210	EC240	EC290	EC360
DAEWOO	DH55	DH130	DH180	DH200	DH280	DH300	DH320
HYUNDAI	R60	R130	R200	R210	R220	R290	R320	R914
KATO	HD250	HD400	HD450	HD700	HD770	HD820	HD1250
KOBELCO	SK40	SK60	SK100	SK120	SK200	SK220	SK04-2	SK07
	SK07N2	SK09	SK12	SK14	SK300	SK310	SK400
JCB	JS70	JS75	JS110	JS130	JS160	JS180	JS200	JS220
	JS240	JS260	JS300	JS330
SUMITOMO	SH70	SH100	SH120	SH160	SH200	SH260	SH265	SH280	SH300
	SH340	LS2650	LS2800	LS3400	LS4300
	MX8	SE200	SE210	SE280	MX292	SE350
MITSUBISHI	MS110	MS120	MS140	MS180

Specification

A	B	C	D	E	F	G	H	I	K
504.3	408	292	244	236	255	190	140	320	40
448.5	380	251.2	209.2	257	222	182	136	306	34
400.8	332	228	189	247	210	155	114	258	34
431.8	370	251.2	209.2	257	222	184	114	239	34

M	N	O	P	Weight	Model
120	282	18	26	123 ( SF )	S032
				127 ( DF )	D155-1
106	248	16	23.5	74 ( SF )	S022
				81 ( DF )	085A-13
99	231	16	20.5	54 ( SF )	D60
				61 ( DF )
106	249	16	23.5	68.6 ( SF )	D76
				75.5 ( DF )

The production process of bottom roller 

Wheel body forming (forging/spinning)

There are two main ways to form the blank of the bottom roller:

1. Forging. Heat 50Mn, 40Mn2 and other round steels to 920 ℃~1200 ℃, and use mainstream processes such as pre forging and final forging to achieve dense structure and high strength; Advanced technology can achieve synchronous molding of the inner cavity and outer shape in one go.

2. Spinning. After the steel plate is cut, it is spun into shape by a spinning machine. High material utilization rate, lightweight, suitable for specific structures.

Before forming, advanced processes will perform high-pressure water descaling to quickly remove surface oxide skin and prevent the forging from being pressed in and affecting quality

Heat treatment strengthening

This is the key process that determines the wear resistance and service life of the bottom roller:

1. Quenching: Use forging waste heat (820 ℃~860 ℃) to directly spray liquid for quenching for 70~120 seconds, eliminating the need for reheating; Or adopt a continuous quenching and tempering production line to ensure quality stability

2. Tempering: Tempering at 180 ℃~220 ℃ to eliminate internal stress

3. Surface hardening: Induction hardening of the wheel surface, with a hardness of HRC 52-58 and a hardened layer of 8-12mm

4. The new type of non quenched and tempered steel can eliminate the quenching and tempering process, making it more energy-efficient and environmentally friendly

Precision machining (machining)

The heat treated blank enters the precision machining stage:

1. Wheel body: CNC turning of bearing holes, retaining edges, O-ring grooves, etc. at both ends to ensure dimensional accuracy

2. bottom roller axle: made of 45 steel or 40Mn2 material, requiring quenching and medium frequency quenching, with a hardness of around HRC42 and high precision requirements

Assembly

Assemble the wheel body, axle, shaft sleeve, floating oil seal, end cover and other components:

1. Floating oil seal: made of high chromium molybdenum alloy with a hardness of HRC65~72, ensuring a leak proof seal

2. O-ring: Nitrile rubber seal

3. Conduct airtightness testing after assembly, and after passing the test, spray anti rust paint and package for storage

Company Profile

SMCC was established in 1997 and is located in Qingdao, China. Qingdao Star Machine Technology Co., Ltd. is a high-tech enterprise specializing in the research, development, manufacturing and sales of industrial roller chains, conveying chains, industrial sprockets and other conveying accessories. It also produces Alstom OptiPow piston pulse diaphragm electromagnetic valves and accessories.

We have a global sales network and service system. Currently, we have over 150 distributors and business partners in more than 30 countries, including Vietnam, South Korea, Thailand, Bangladesh, Singapore, the Philippines, Malaysia, Russia, Kazakhstan, Uzbekistan, Ukraine, Iran, Saudi Arabia, Chile, Brazil, Canada, the United States, Mexico, Poland, etc.

Certifications

Packing & Delivery