Dorman - HD Solutions Power Steering Reservoir P/N:603-5106

Help keep dirt and debris out of the steering system with the Dorman power steering reservoir 603-5106 from the HD Solutions line. This OE FIX replacement swaps the failure-prone original cap design for a full threaded cap with reinforced twist tabs. It fits many heavy duty trucks, among them the 2014-2016 International 4300, the 2014-2016 International 4300LP and the 2012-2016 International 4400. It is a direct-fit replacement for the listed applications. See the Buyer's Guide tab for the full list and engine details.

On certain heavy duty vehicles, the factory reservoir has a cap that is prone to failure and can let dirt and debris in. Dorman redesigned this unit to address that weak point:

• Upgraded replacement: redesigned to reduce contamination and help prevent broken twist tabs.
• Cost-saving design: intended to spare you from replacing the whole reservoir when a cap breaks during a filter change.
• Improved cap: a full threaded cap with reinforced twist tabs takes the place of the original cap design.
• Quality engineering: designed in the United States and backed by Dorman's decades of automotive aftermarket experience.

The reservoir holds the fluid supply for the power steering system. Signs it may need replacing include:

• fluid seeping from the reservoir or cap
• a cracked or broken cap
• damaged twist tabs
• debris in the fluid

Consult the vehicle service information for the correct fluid and the fill procedure.

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