391-4638 Boom Cylinder Seal Kit for Caterpillar 308E Mini Excavator

391-4638 Boom Cylinder Seal Kit for Caterpillar Equipment

Address hydraulic fluid leaks and restore proper cylinder pressure with the WINSCHEN 391-4638 Boom Cylinder Seal Kit. Engineered to meet the precise operational standards of Caterpillar mini hydraulic excavators, this aftermarket seal kit provides the essential elastomeric components required to fully rebuild and maintain your hydraulic boom 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 391-4638.
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 highly functional aftermarket alternative that meets original equipment specifications, providing a reliable solution for hydraulic cylinder rebuilding and minimizing routine equipment downtime.

Compatible Equipment Models

Mini Hydraulic Excavators: 308E

Seal Kit Related Parts

Part No	Qty	Parts name
415-3108	1	RING (DUST)
093-1519	1	RING-BACKUP
382-5758	2	RING-BACKUP
415-3107	2	RING-BACKUP
415-3109	1	RING-BACKUP
382-5756	1	RING-WEAR
170-9841	1	SEAL-BUFFER
382-5771	2	SEAL-DUST
093-1432	2	SEAL-LIP TYPE
374-3667	1	SEAL-LIP TYPE
3J-1907	1	SEAL-O-RING
4J-5140	1	SEAL-O-RING
095-1703	1	SEAL-O-RING
095-1716	1	SEAL-O-RING
161-6149	2	SEAL-O-RING
382-5765	2	SEAL-O-RING
391-4635	1	SEAL-O-RING
095-1627	2	SEAL-O-RING
382-5755	1	SEAL-PISTON
170-9857	1	SEAL-U-CUP

Specifications

Part Number	391-4638 (3914638)
Part Type	Boom Cylinder Seal Kit / Service Kit
Application	Boom Cylinder Rebuild
Brand	WINSCHEN
Country of Origin	China
SKU	CTC-391-4638
MOQ	1 SET
Delivery Time	1-3 business days

To ensure proper fitment, please verify your machine exact 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.