SANY SY220 Track Tensioner Cylinder Assembly – OEM Undercarriage Cylinder Heavy

Product Introduction

Looking for a reliable SANY SY220 track tensioner cylinder to keep your excavator tracks properly tensioned? Our track adjuster cylinder assembly is a direct-fit excavator undercarriage cylinder engineered as a replacement track tensioner for the SANY SY220 excavator. This grease track tensioner works as an OEM-equivalent track cylinder, restoring proper track sag and reducing undercarriage wear. Whether you call it a SANY SY220 track cylinder, a track adjuster assembly, or a heavy-duty tensioner cylinder, this unit is built for long service in construction, quarry, and rental fleets. Order today and get your machine back on track.

Parameters / Specifications

Dimensions are typical reference values. Please confirm exact bore, rod, stroke, and mounting by machine serial number before ordering.

Product Technology

This track tensioner cylinder is manufactured with CNC machining and precision heat treatment. The barrel is skived, roller burnished, and diamond-honed to Ra 0.2–0.4 μm, reducing friction and leakage. The piston rod is centerless ground, hard chrome plated, and polished. Ultrasonic inspection ensures zero material defects. Every cylinder is pressure tested before shipment.

Product Working Principle

The track tensioner cylinder uses high-pressure grease to push a piston outward. When grease is injected through the grease fitting, the piston rod extends and pushes the front idler forward, increasing track tension. To loosen the track, open the bleed valve and allow a small amount of grease to escape. This design provides simple, reliable track adjustment without connecting to the main hydraulic system.

Manufacturing Process

1. Raw Material Inspection: High-tensile steel tube and 40Cr rod are spectrographically tested.

2. Barrel Preparation: Tube is cut, skived, and roller burnished.

3. Honing: Diamond honing achieves final bore tolerance and surface finish.

4. Rod Machining: Rod is turned and centerless ground to precise diameter.

5. Chrome Plating: Hard chrome plated and polished to mirror finish.

6. Welding: Mounting flange and grease port are TIG-welded and stress-relieved.

7. Assembly: Piston, seals, rod, and end caps assembled in a clean environment.

8. Pressure Testing: Each cylinder tested for leakage and structural integrity.

9. Painting & Packaging: Anti-corrosion paint applied, packed in wooden crate for export.

FAQ

Q1: How do I confirm this cylinder fits my SANY SY220?
This tensioner cylinder is manufactured for the SANY SY220 / SY220C. Please confirm your machine serial number and compare bore, rod, stroke, and mounting dimensions. Send us a photo of your old cylinder if unsure.

Q2: Does this cylinder use hydraulic oil or grease?
It uses high-pressure grease, not hydraulic oil. Grease is injected through the grease fitting to extend the piston and tension the track.

Q3: How do I adjust track tension?
Inject grease through the fitting until the track sag reaches the manufacturer’s specification. To loosen, open the bleed valve slowly and release a small amount of grease.

Q4: What are the signs of a failing tensioner cylinder?
Grease leaks, inability to hold track tension, a fully extended rod, or a loose track that cannot be tightened. If you notice these signs, replace the cylinder or seal kit.

Q5: Can I install this cylinder myself?
Yes, for an experienced mechanic. Support the machine safely, release track tension, remove the old cylinder, install the new one, and refill with grease. Always follow safety procedures.

Q6: Do you provide seal kits?
Yes, complete seal kits for this tensioner cylinder are in stock.

Q7: Is this a genuine SANY part?
This is a high-quality aftermarket replacement built to OEM specifications. It is not a genuine SANY part, but it matches OEM fit and performance at a lower price.