We manufacture Sumitomo track adjust assemblies, hydraulic tensioning cylinders that control track sag and maintain idler position in excavator undercarriages.
Factory-direct production includes CNC machining, honing, chrome plating, seal assembly, and full OEM manufacturing services for global distributors and fleet owners.
This assembly prevents track derailment and uneven wear by holding precise tension, resisting grease pressure loss, seal failure, and cylinder scoring.
With over 20 years of undercarriage manufacturing experience, Dingtai is ISO9001 and SGS certified, ensuring repeatable metallurgy and dimensional accuracy.
Key materials include 35MnB forged steel cylinder bodies, induction-hardened surfaces at HRC 50–55, chrome-plated rods, and premium polyurethane seals.
- Premium 35MnB Material: Forged 35MnB or equivalent steel bodies provide high tensile strength and resistance to bending fatigue under heavy excavator loads.
- Deep Quenching/Heat Treatment: Cylinder bores and rods are induction hardened to HRC 50–55 with case depth of 2–4 mm for extended wear life.
- ISO9001/SGS Certified: Every production batch follows documented quality plans, material traceability, and SGS third-party inspection before shipment.
- 100% QC Inspection: Each assembly is pressure tested, dimensionally inspected, and checked for seal integrity prior to export packaging.
Our catalog of Sumitomo Track Adjust Assembly includes various specifications, fully compatible with Sumitomo excavators and bulldozers.
Why Choose Dingtai?
Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 40Cr forged steel cylinder body, 45# steel piston rod |
| Hardness | HRC 50–55 on wear surfaces, case depth 2–4 mm |
| Process | CNC turning, honing, induction hardening, chrome plating, precision assembly |
| Certification | ISO9001:2015, SGS third-party inspection |
| Warranty | 12 months or 2,000 working hours, whichever comes first |
OEM & Customization
We manufacture from original samples or drawings, customizing rod stroke, mounting dimensions, and seal kits to meet exact Sumitomo OEM specifications.
Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Hydraulic Excavators | Sumitomo | SH120, SH200, SH210, SH240, SH300, SH350, SH480 |
| Demolition / Crawler Machines | Sumitomo | SH210, SH240, SH300, SH350, SH480 |
Delivery & Logistics
We provide factory-direct pricing, reliable sea freight or air shipping, standard export packaging, and flexible MOQ from one unit for stock orders.
Technical Features
The track adjust assembly uses a sealed grease chamber; pumping grease extends the piston and rod to set precise track tension without hydraulic oil.
A floating seal and wiper ring retain grease while blocking abrasive soil, preserving internal pressure and preventing cylinder bore scoring.
Forged cylinder body and chrome-plated rod resist high bending loads and corrosion, ensuring stable idler alignment under shock loads.
Applications
- Mining – track tension stability on rocky, abrasive terrain.
- Road Construction – consistent track alignment during grading and earthmoving.
- Quarrying – resistance to dust, stone impact, and heavy shock loading.
- Demolition – reliable undercarriage performance in debris-filled job sites.
- Forestry and Heavy Civil Works – durable sealing against soil and moisture ingress.
Frequently Asked Questions
What is the MOQ for Sumitomo track adjust assemblies?
One unit for standard stock models; custom OEM orders usually start at 5–10 pieces.
What is the delivery time?
Stock items ship within 7–15 days; custom production requires 25–35 days depending on quantity.
What heat treatment depth do you achieve?
Cylinder bore and rod surfaces are induction hardened to HRC 50–55 with depth of 2–4 mm after CNC machining.
What warranty policy applies?
12 months or 2,000 working hours, whichever comes first, covering material and manufacturing defects under normal use.
Can you match Sumitomo part numbers?
Yes. Provide original part number or drawing; our engineers cross-reference dimensions and seal kits to match OEM specifications.
Do you supply seal kits separately?
Yes, we provide complete assemblies or individual seal kits, rods, pistons, and grease fittings.
Maintenance Guide
- Before installation, clean the mounting bore and idler bracket; inspect for cracks or distortion and apply grease to contact surfaces.
- Align the assembly squarely with the track frame; torque mounting bolts to OEM specifications to prevent side loading and seal leakage.
- Grease through the fitting until track sag meets OEM value; do not over-tension, as excessive pressure damages seals and idler bearings.
- Inspect every 250 hours for grease leakage, rod scoring, or cylinder corrosion; replace seals or full assembly if adjustment fails.