Track Roller for Komatsu PC1250 Excavator

Request a Quote

Website: http://constructionparts-en.com/1-1-1-1-track-roller.html

Focusing on 20-330 Ton Heavy Equipment Undercarriage Manufacturing
Delivering 1:1 OEM Alternatives to Global Distributors, Manufacturers, and Major Repair Workshops.

Compatible Komatsu Excavator ModelsPC1100 6, PC1100LC 6, PC1250SP 7,PC1250 7
OEM Part NumbersKM2503, 21N-30-00120, 21N-30-00121

Technical Specifications

Description: Track Roller

Place of origin: China

Brand name: PT'ZM

Applicable machine model: PC1250

Applicable machine brand: Komatsu

Part number: 21N-30-00121

Certificate: GB/T19001-2016, ISO9001:2015

Price: Negotiate

Packaging method: Fumigate seaworthy packing

Delivery time: 7-30 days

Payment Terms: T/T, other terms negotiable

Shipping terms: FOB, CIF, CFR

Minimum order quantity: 1pc

Supply ability: 1000pcs/month

Material: 40Mnb2/42Crmo

Manufacturing process: Forging

Finish: Smooth

Hardness: HRC48-55, depth 8-10mm

Quality: Mining operation, heavy duty

Warranty period: 12 months

After-sales service: Video technical support, online support

Color: Black or customer required

Application: Crawler excavator

Size Chart (unit: mm)

PC1250	A	B	C	D	E
	388	550	480	372	300
	F	G	H	I
	126	276	320	180

Extended Service Life and Superior Durability

Our track rollers are engineered with carefully selected materials and advanced processing techniques to ensure long-lasting performance:

The roller is made from forged 40MnB2 high wear-resistant boron steel, heat-treated to a surface hardness of HRC 48-55 with a hardening depth of 8-10mm, delivering excellent wear resistance.
The center shaft is forged from 42CrMo alloy steel, with a surface hardness of HRC 48-55 and core hardness above HRC 28, providing both wear resistance and high fracture toughness.
The shaft surface is precision polished by CNC machining to minimize wear on the internal copper bushing during operation.
Pure copper bushings are used internally to enhance wear resistance, while high-density sealing rings protect the internal structure from dust, sand, and moisture intrusion.

Track Rollers function The function of the track roller is to convey the weight of an excavator to the ground . When an excavator is run on uneven ground, track rollers carry a tremendous impact. Therefore, the support of track roller is huge. Moreover, if it is of poor quality and is often dusty, it needs a very good sealing to prevent dirt, sand and water from damaging it.

Komatsu PC1250 excavator undercarriage parts number list

We specialize in manufacturing the whole set of undercarriage parts for 200 ton mining excavators. Now we have completed the PC1250 front idler, track and carrier roller, sprocket segment rim, chain assembly.

Track Link Assy	48L	21N-32-00101
Track Shoe	700MM	21N-32-31110
Idler Assy		21N-30-00111
Carrier Roller		21N-30-00130
Track Roller		21N-30-00121
Sprocket	25T-38H	21N-27-31191