Husqvarna 503289026 Piston Ring – Genuine OEM Replacement Engine Piston Ring
Part Number: 503289026
Category: Chainsaw & Power Cutter Engine, Piston & Cylinder Components
Type: Piston Ring – Genuine OEM Replacement Engine Piston Ring
The Husqvarna 503289026 Piston Ring is a genuine OEM replacement engine component designed for select Husqvarna chainsaws and professional power cutters. Installed around the piston within the cylinder, the piston ring helps maintain engine compression and provides the necessary seal between the piston and cylinder wall.
Product Specifications
- Part Number: 503289026
- Manufacturer: Husqvarna
- Product Type: Piston Ring
- OEM Description: Piston Ring
- Component Type: Internal Engine / Piston Component
- Function: Helps Seal the Piston Against the Cylinder Wall
- System: Piston / Cylinder / Engine Assembly
- Application: Chainsaw / Power Cutter
- Compatible Brand: Husqvarna
- Documented Models: 3120 / 3120 XP / 3120K / 3122K / K1250 / K1260
- Ring Thickness: 1.5 mm
- Component Location: Piston & Cylinder Assembly
- Associated Components: Piston / Cylinder / Wrist Pin / Circlips / Needle Bearing
- Replacement Type: Direct OEM Replacement
- OEM Status: Genuine Husqvarna OEM Part
- Condition: New
- Quantity: 1 Piston Ring
- UPC: 805544334617
- Part Number Reference: 503289026
- Alternate Number Format: 503 28 90-26
- Replaces: 501894301
OEM parts references confirm that 503289026 supersedes Husqvarna 501894301, while Husqvarna's official diagrams identify it as the piston ring used with applicable piston assemblies.
Features & Benefits
- Genuine Husqvarna OEM replacement piston ring
- Factory-designated Piston Ring
- Designed for select Husqvarna chainsaws and power cutters
- Installs around the applicable engine piston
- Helps maintain proper cylinder compression
- Provides a sealing interface between the piston and cylinder wall
- Supports efficient combustion
- Helps maintain proper engine performance
- Manufactured to original equipment requirements
- 1.5 mm ring thickness
- Designed for the applicable OEM piston and cylinder configuration
- Suitable for piston and cylinder repairs
- Useful during engine rebuilding and overhaul
- Helps restore compression when replacing a worn piston ring
- Replaces earlier Husqvarna 501894301
- Direct replacement for equipment requiring 503289026
- Genuine OEM engine component rather than an unspecified universal piston ring
Documented Applications
The Husqvarna 503289026 Piston Ring is documented for multiple large-displacement Husqvarna chainsaw and power-cutter applications, including:
- Husqvarna 3120
- Husqvarna 3120 XP
- Husqvarna 3120 XP EPA
- Husqvarna 3120K
- Husqvarna 3120K EPA
- Husqvarna 3122K
- Husqvarna K1250
- Husqvarna K1250 Active
- Husqvarna K1250 Rail
- Husqvarna K1260
- Husqvarna K1260 Rail
- Compatible piston and cylinder assemblies
- Engine rebuilding applications
- OEM replacement applications requiring 503289026
A parts fitment reference specifically lists the 3120, 3120K, 3120XP, 3122K, K1250, K1250 Active, K1250 Rail, K1260, and K1260 Rail as applications for 503289026.
Piston & Cylinder Assembly
On documented Husqvarna 3120 applications, the 503289026 Piston Ring is installed with the applicable piston assembly and associated engine components. Husqvarna's illustrated parts list includes:
- 503289026 – Piston Ring
- 501894103 – Piston Assembly
- 503132901 – Needle Holder
- 737441300 – Circlip
- Applicable cylinder assembly
- Cylinder and crankcase gaskets
- Decompression valve
Husqvarna's official 3120 documentation specifies one 503289026 piston ring for the applicable configuration.
On the K1260, however, Husqvarna specifies two 503289026 piston rings with piston assembly 501894103.
Piston Ring Function
The piston ring forms a critical sealing interface between the moving piston and the engine's cylinder wall. During operation, it helps contain combustion pressure above the piston so that expanding gases can effectively drive the piston through its power stroke.
A properly functioning piston ring helps support:
- Engine compression
- Reliable combustion
- Proper engine power
- Efficient piston operation
- Appropriate sealing within the cylinder
- Consistent engine performance
As the ring and cylinder wear, the seal can deteriorate and engine compression may decrease.
Common Signs of Piston Ring Wear
Inspection or replacement of the 503289026 Piston Ring may be appropriate when troubleshooting conditions such as:
- Low engine compression
- Difficult starting
- Reduced engine power
- Poor acceleration
- Excessive piston or cylinder wear
- Scoring on the piston or cylinder
- Broken or damaged piston ring
- Excessive ring end gap
- Engine damage following overheating or lubrication problems
- Damage discovered during cylinder or piston service
These symptoms can also be caused by other engine problems, so the piston, cylinder, crankshaft, bearings, seals, fuel system, and ignition system should be inspected as appropriate.
Replaces Previous Part Number
The Husqvarna 503289026 replaces:
- 501894301
- 503 28 90-26 – Alternate formatting
- 503289026 – Current OEM number
Multiple parts references identify the supersession sequence as 501894301 → 503289026.
Important Notes
- Verify compatibility with your exact Husqvarna model, product number, serial number, engine configuration, piston, and cylinder before ordering.
- Husqvarna officially identifies 503289026 as a Piston Ring.
- Match part number 503289026 directly with the number shown in your equipment's illustrated parts diagram or OEM documentation.
- The alternate formatted part number is 503 28 90-26.
- The ring is documented at 1.5 mm thick.
- Do not select a piston ring based solely on approximate diameter or visual appearance.
- Piston rings can differ in diameter, thickness, profile, end-gap specification, material, and intended piston groove.
- The required quantity varies by engine configuration.
- Husqvarna's 3120 documentation shows one 503289026 ring in applicable assemblies, while K1260 documentation specifies two rings.
- This listing is for one piston ring unless otherwise specified.
- Do not assume that the piston, cylinder, wrist pin, needle bearing, circlips, gaskets, crankshaft, or other engine components are included.
- Inspect the piston and cylinder carefully whenever replacing a piston ring.
- A new piston ring should not be used to compensate for a severely scored, excessively worn, or otherwise damaged cylinder.
- Inspect the piston ring groove for carbon buildup, wear, deformation, or physical damage.
- Check the piston for scoring, cracking, overheating, seizure marks, or other damage.
- Verify ring end gap and other applicable engine clearances according to Husqvarna service specifications.
- Do not excessively spread or twist the piston ring during installation.
- Piston rings are relatively brittle and can break if improperly expanded.
- Install the ring in the correct piston groove and orientation specified by the manufacturer.
- Make sure the piston ring is properly positioned before inserting the piston into the cylinder.
- Use appropriate lubrication during engine reassembly according to Husqvarna service procedures.
- Clean carbon and debris from reusable components without damaging precision sealing surfaces.
- If the original piston ring failed because of overheating, insufficient lubrication, incorrect fuel mixture, air leakage, or cylinder damage, correct the underlying problem before returning the engine to service.
- Internal engine repairs require careful assembly and correct torque procedures. Follow the applicable Husqvarna service documentation.
- Shut off the equipment, allow the engine to cool completely, disconnect the spark plug, and drain fuel where necessary before beginning engine repairs.
- This listing is for one Husqvarna 503289026 Piston Ring only unless otherwise specified. Pistons, cylinders, wrist pins, circlips, bearings, gaskets, seals, and other engine components are sold separately.
- Match part number 503289026 with your equipment's illustrated parts diagram or OEM documentation before ordering to ensure proper fitment.
