FB Seastar cylinder seal kit (incl. EC53XX) with key – code: ST-HS5157 – Indemar

FB SeaStar cylinder seal kit with Indemar ST-HS5157 (HS5157) wrench

The FB SeaStar cylinder seal kit with key, identified by the Indemar code ST-HS5157 (equivalent to the original code HS5157), is designed for hydraulic cylinder overhaul of SeaStar steering in configuration Front Mount / FB. It is a spare part dedicated to replacing seals and associated components, useful when you want to restore the proper sealing of the circuit and bring the cylinder back to an orderly operating condition within control systems for outboard motors.

In nautical contexts, the maintenance of cylinder seals is a typical step when signs of wear are detected or when a periodic overhaul of the hydraulic steering system is planned.

Features and details

Product identification

• Supplier: Indemar S.p.A.
• Supplier product code: ST-HS5157
• Original reference code: HS5157
• Type: seal kit / gasket kit for hydraulic cylinder
• Cylinder configuration: Front Mount / FB
• Equipment: kit with key for disassembly/assembly operations

Function of the seal kit

The kit is intended for the maintenance of hydraulic steering cylinder SeaStar in frontal version. During an overhaul, replacing the seals and related components aims to keep the circuit in proper condition, limiting the possibility of leaks and contributing to smooth steering operation.

In particular, the kit is suitable for:

• replacement of worn seals of the cylinder;
• restoring sealing of the hydraulic circuit at the relevant parts;
• support for overhaul and scheduled maintenance of the cylinder.

Kit contents (confirmed equipment)

The equipment includes sealing components and dedicated tools to support the intervention phases on the cylinder. The content indicated for this kit includes:

• 2 seal glands;
• pin wrench for disassembly/assembly;
• guide tool for assembling the seal gland;
• associated sealing components according to cylinder configuration.

The presence of the supplied tools is particularly useful when you want to operate neatly on the closure parts and glands, reducing the risk of damage during disassembly and reassembly phases.

Applications

Use on hydraulic steering for outboards

The kit is intended for SeaStar hydraulic steering used on outboard engines, where the front cylinder converts the oil pressure generated by the steering pump into the movement necessary for steering. In this scenario, the correct sealing of the cylinder is a central aspect to keep the system in proper condition and to manage hydraulic circuit maintenance effectively.

Indicated compatibility (SeaStar front cylinders)

The compatibility reported for the kit ST-HS5157 / HS5157 includes several series of SeaStar front cylinders, including:

• HC5340
• HC5341
• HC5342
• HC5343
• HC5344
• HC5345
• HC5346
• HC5347
• HC5348
• HC5358
• HC5365
• HC5375
• HC5394
• HC5445
• HC6750
• HC6751
• HC6752
• HC6753
• HC6754
• HC6755

Note: for a correct selection of the spare part, it is always advisable to check the code of the installed cylinder and compare it with the reference codes of the kit.

Advantages for maintenance and spare parts management

• Clear double coding: ST-HS5157 (Indemar) and HS5157 (original) facilitate identification, comparison, and reordering.
• Kit with dedicated tools: the pin wrench and guide tool support operations on glands and sealing parts, making the intervention more straightforward.
• Specific spare part for FB configuration: targeted solution for SeaStar front cylinders, useful when you want to avoid generic non-dedicated components.
• Support for cylinder overhaul: suitable for routine maintenance or when it is necessary to restore the cylinder's seal.

Usage and operational notes

Before purchase and installation, check:

• the cylinder configuration (Front Mount / FB);
• the SeaStar cylinder series installed;
• the code match ST-HS5157 / HS5157 with the requested spare part.

During the overhaul, it is good practice to work carefully to avoid contamination in the hydraulic circuit and to keep components organized during disassembly. If the system shows anomalies not related to the seals, it is advisable to carry out a broader check of the steering system (pump, pipes, and connected components) to correctly identify the cause of the problem.

This product is intended for maintenance operations on SeaStar cylinders: for identification doubts or application confirmations, it is useful to refer to the cylinder code and the documentation of the installed system.

FAQ – Frequently Asked Questions

Do ST-HS5157 and HS5157 indicate the same kit?

Yes. ST-HS5157 is the Indemar code, while HS5157 is the original reference code for the same seal kit.

What is the seal kit for the FB SeaStar cylinder used for?

It is used for the overhaul of the SeaStar hydraulic steering cylinder in Front Mount / FB configuration, replacing the seals and associated components to restore the correct circuit sealing.

Does the kit include tools for disassembly and assembly?

Yes. The confirmed equipment includes a pin wrench and a guide tool for assembling the seal gland, in addition to the glands and associated sealing components.

How many seal glands are included in the kit?

The kit includes 2 seal glands.

With which SeaStar cylinders is it compatible?

The indicated compatibility concerns various series of SeaStar front cylinders (Front Mount / FB), including HC5340–HC5348, HC5358, HC5365, HC5375, HC5394, HC5445, and HC6750–HC6755.