Hydraulic Trailer Brake Cylinder – 12 mm Pin Holes, 95 mm Stroke, Spring Return – SPH340448

Key Features & Benefits

• Single-acting hydraulic operation: Converts hydraulic pressure into movement to operate a compatible mechanical trailer braking system.
• Internal return spring: Helps retract the piston rod when hydraulic pressure is released.
• Ø12 mm (0.47") pin connections: Mounting holes at the piston rod end and rear cylinder mounting point.
• Flexible linkage connections: Compatible clevis fittings or other suitable mounting adapters can be attached using the piston rod pin hole.
• 95 mm (3.74") stroke: Provides the required travel in compatible brake mechanisms.
• G 1/2 BSP hydraulic connection: For connection to compatible hydraulic brake lines.
• Replacement brake actuator: Suitable for existing trailer brake systems when the mounting dimensions and operating requirements match.

Ø12 mm Pin Connection – Flexible Mounting Options

The chrome-plated piston rod features a Ø12 mm (0.47") pin mounting hole, allowing compatible mechanical linkage components to be connected using a suitable retaining pin.

Depending on the trailer brake mechanism, different mounting arrangements can be used.

Main Technical Specifications

The essential dimensions are listed below. For additional mounting measurements, refer to the technical drawings in the product image gallery.

How Does the Internal Spring Return Brake Cylinder Work?

The SPH340448 is a single-acting hydraulic trailer brake ram that uses hydraulic pressure for brake actuation and an internal spring to assist piston rod return.

Hydraulic brake actuation: When hydraulic pressure is supplied, the piston rod extends and transfers force through the connected linkage to the trailer brake mechanism.

Spring-assisted return: When hydraulic pressure is released, the built-in return spring helps retract the piston rod towards its original position.

Any additional return springs or components required by the complete braking system must remain in place.

Applications – Agricultural Trailer Brake Systems

This hydraulic spring-return brake cylinder can be used in compatible applications including:

• Agricultural trailers with hydraulic brake systems.
• Tractor-towed farm transport trailers.
• Suitable feed mixer wagons and manure spreaders.
• Compatible agricultural tankers and transport equipment.
• Replacement of existing pin-mounted trailer brake cylinders.

Compatibility depends on the mounting dimensions, hydraulic operating conditions and the complete braking system.

Installation & Brake Safety

Install the cylinder using compatible mounting pins or suitable mechanical linkage components. Check correct alignment and ensure the piston rod can move without excessive side loading.

After connecting the hydraulic line, bleed the braking system correctly and check for leaks, proper brake actuation and reliable return movement.

Frequently Asked Questions