Hydraulic lash adjusters

Eaton's hydraulic lash adjusters are specifically designed to automatically adjust valve lash ensuring precise valve seating, optimized engine air flow, and precise fuel management. Our hydraulic lash adjusters ensure stable valvetrain operation during engine life, are maintenance free, and are key contributors to the reduction of engine NVH. Eaton hydraulic lash adjusters are designed for single and double overhead camshaft (SOHC and DOHC) valvetrains and overhead valve (OHV) or pushrod-type valvetrains in internal combustion and spark ignition engines.

Eaton's hydraulic lash adjusters are specifically designed to automatically adjust lash in commercial vehicle engines with Type III and Type V valvetrains ensuring precise valve seating, optimizing engine air flow and fuel management.

The market leader in commercial engine hydraulic lash adjusters, our product designs include hydraulic roller follower, flat face nailhead tappet, and shaft-mounted rocker arms with hydraulic capsules.

Hydraulic lash adjusters internal design enables best-in-class oil reservoir ratio to ensure silent valvetrain functioning during engine cold start.

Hydraulic lash adjuster plunger and clipping design ensure highest side stiffness in the market and high resistance to side loads.

Specific coatings are available to reduce wear and friction losses.

Function of a hydraulic lash adjuster or lifter

Hydraulically maintains optimal valvetrain clearances
Compensates for both mechanical and thermal changes in the valvetrain to ensure the valve seals against the seat during every event

Cut-away of overhead camshaft cylinder head showing valvetrain components

Key features and benefits:

Consistent Combustion

Hydraulic lash adjusters enable consistent lash throughout the life of the engine, resulting in consistent combustion

Reduced noise, vibration and harshness (NHV)

The internal design enables best-in-class oil reservoir ratio to ensure silent valvetrain function during engine cold start

Eliminates lash-setting maintenance

In medium- and heavy-duty diesel engines, valve adjustments are still a common maintenance practice. This task is eliminated in engine designs utilizing our hydraulic lash adjusters and vehicle owners can save over $1,000 in labor costs over the life of the engine

Compact Packaging

Modern diesel aftertreatment systems have made diesel truck engine compartments a crowded environment. This makes adjusting the valves a difficult and time-consuming operation. Since our hydraulic lash adjusters eliminate the need for routine valve lash adjustment, vehicle manufacturers can design more compact packaging for the engine and aftertreatment systems

Improved Dynamics

Hydraulic lash adjusters are a proven technology engineered to improve dynamic behavior by lowering valve seating velocities which equates to lower warranty costs
The plunger and clipping design ensure highest side stiffness in the market and high resistance to side loads

Compatibility with VVA

Eaton’s hydraulic lash adjusters design can be engineered to be used in combination with our variable valve actuation technologies

Flexible locations

Because every situation is unique, our hydraulic lash adjusters can be placed in a variety of locations: in a roller lifter, in a flat-face lifter, as a capsule in a rocker arm, or in a pushrod or push tube.

Use cases

Eaton’s mission is to improve the quality of life and the environment through the use of power management technologies and services. We provide sustainable solutions that help our customers effectively manage electrical, hydraulic and mechanical power – more safely, more efficiently and more reliably. Eaton’s 2019 revenues were $21.4 billion, and we sell products to customers in more than 175 countries. We have approximately 97,000 employees.

Hydraulic lash adjusters

Function of a hydraulic lash adjuster or lifter