397-9091 Stick / Arm Cylinder Seal Kit for Caterpillar 320D 320D2 Excavators

397-9091 Stick / Arm Cylinder Seal Kit for Caterpillar Equipment

Address hydraulic fluid leaks and restore proper stick cylinder pressure with the WINSCHEN 397-9091 Seal Kit. Engineered for Caterpillar excavator service applications, this aftermarket seal kit provides the essential sealing components required to rebuild and maintain hydraulic stick / arm cylinder assemblies.

Key Features

Direct Replacement: Manufactured to specific OEM dimensional tolerances, ensuring a seamless fit and straightforward installation as a direct replacement for Caterpillar part number 397-9091.
Industrial Durability: Constructed from fluid-resistant polyurethane and high-grade rubber compounds designed to withstand continuous internal friction, high pressure spikes, and environmental contaminants typical in earthmoving applications.
Cost-Effective Maintenance: A practical aftermarket solution for hydraulic cylinder rebuilding, helping reduce leakage, restore sealing reliability, and minimize equipment downtime.

Compatible Equipment Models

Excavators: 320D, 320D2 Caterpillar

Seal Kit Related Parts

Part No	Qty	Parts name
240-6332	1	SEAL
240-6359	2	RING-EXPANDER
398-0943	2	RING
398-0944	1	RING
398-0948	1	RING-BACKUP
398-0949	1	RING
398-0951	1	SEAL
398-0952	1	SEAL
398-0953	2	SEAL
398-0955	1	SEAL
398-0956	1	SEAL
398-0962	1	SEAL AS
398-2329	2	SEAL

Specifications

Part Number	397-9091 (3979091)
Part Type	Stick / Arm Cylinder Seal Kit / Service Kit
Application	Hydraulic Stick / Arm Cylinder Rebuild
Brand	WINSCHEN
Country of Origin	China
SKU	CTC-397-9091
MOQ	1 SET
Delivery Time	1-3 business days

To ensure proper fitment, please verify your machine model and original hydraulic cylinder configuration with our support team prior to purchasing. We offer fast global shipping to keep your heavy machinery operating efficiently.

Related Caterpillar Seal Kit Categories

Browse more Caterpillar replacement parts or compare other hydraulic cylinder seal kits. For fitment confirmation, send the OEM part number, machine model through our inquiry form or WhatsApp.