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Piston Rod

Rod seal life is maximized by manufacturing piston rods from precision ground, high tensile carbon alloy steel, hard chrome plated and polished to 0.2µm max. Piston rods are induction case hardened to Rockwell C54 minimum before chrome plating, resulting in a dent-resistant surface.

Bushing

Continuous lubrication, and therefore longer bushing life, are provided by the long iron bearing surface inboard of the primary seal. The bushing, complete with rod seals, can easily be removed without dismantling the cylinder and without special tools, so servicing is quicker - and therefore more economical.

Rod Seals

The Tuff Seal primary seal has a series of sealing edges which take over successively as pressure increases, providing efficient sealing under all operating conditions. On the return stroke the serrations act as a check valve, allowing the oil adhering to the rod to pass back into the cylinder.

The double lip wiperseal acts as a secondary seal, trapping excess lubricating film in the chamber between the wiper and lip seals. Its outer lip prevents the ingress of dirt into the cylinder, extending the life of gland and seals.

The Tuff Seal is manufactured from an enhanced polyurethane, giving efficient retention of pressurized fluid and long service life.

Cylinder Tube

Strict quality control standards and precision manufacture ensure that all tubes meet rigid standards of straightness, roundness and surface finish. The steel tubing is surface finished to minimize internal friction and prolong seal life.

Cylinder Tube End Seals

To make sure that the cylinder tube remains leaktight, even under pressure shock conditions, Miller Fluid Power utilizes pressure-energized tube end seals.

One-Piece Piston

A long thread engagement secures the piston to the piston rod and, as an added safety feature, pistons are secured by an anaerobic adhesive.

Cushioning

Progressive deceleration is available by using profiled cushions at the head and cap. The head end cushion is self aligning, while the polished cap end plunger is an integral part of the piston rod.

Floating Cushion Bushings and Plungers

Closer tolerances - and therefore more effective cushioning - are permitted by the use of a floating cushion plunger at the head end of the cylinder, and a floating cushion bushing at the cap end. A slotted cushion plunger on the head end, and the floating bronze cushion bushing in the cap, provide minimum fluid restriction at the start of the return stroke. This allows full pressure to be applied over the entire area of the piston, providing full power and fast cycle times.

Cushion Adjustment

Needle valves are provided at both ends of the cylinder for precise cushion adjustment. 63mm bores and smaller contain the cartridge cushion assembly shown below.

Piston Seals

Miller's B style piston is a single seal design which incorporates two wear strips. This design provides smooth operation, long bearing life, and high load carrying capacity.