Truck & Off-Highway Engineering - December 2023 - 15

POWERTRAIN FEATURE
The core architecture of the 2600 Series reportedly supports the future
development of spark-ignited natural-gas and hydrogen fuel capabilities.
Integration of several key components as well as a reduction in
the number of leak joints by 45% has resulted in decreased fluid
consumption and extended oil and fuel filter service intervals of
up to 1,000 hours.
The valvetrain also has seen serviceability improvements thanks to
the use of hydraulic lash adjusters over solid lifters. HLAs are becoming
more common on off-highway engines as their design eliminates
checking valve clearance as a service procedure. AGCO also utilized
HLAs in its CORE 75 off-highway engine that was displayed at
CONEXPO 2023 (www.sae.org/news/2023/05/agco-core75-engine).
Chen described the thought process behind the switch to HLAs.
" Oil is readily available and easily plumbed, especially in these valvetrain
components, " he explained. " So it made the most sense certification-wise.
Also, by eliminating lash adjustment, we also gained a
serviceability advantage. The valve cover is really annoying to pull off
in a lot of these machines, and checking valve clearance once it is off
isn't easy either. "
The oil capacity of the 2600 Series also enables longer service intervals.
The largest pan offered is 64 liters (68 quarts) and is rated
for a 1,000-hour oil top-off interval. There is also a 45-liter (48-quart)
pan with options for front and rear sumps as well as a shallow sump
for applications with clearance constraints.
A design feature aimed at ease of user integration is the blockmounted
engine control module (ECM). The unit is double ISO
mounted on the side of the engine. Despite the amount of shock load
and dust the unit may be exposed to in that location, Chen explained
that this mounting offers several advantages. " It's well damped from
vibration thanks to where it's mounted on the block. We've had success
in the past with examples that have survived in this location
with no issues, and this will be no different. "
Chen also pointed out the integration advantages of this mounting
location. " What you don't see on this pre-prototype engine is our
jumper system with multiple pin connectors that would all spit out
right here, " he said, pointing to the connector side of the ECM. " So depending
on the customer, we would integrate things like telematics
TRUCK & OFF-HIGHWAY ENGINEERING
The 2600 Series engines are all compatible with renewable liquid
fuels such as 100% hydrotreated vegetable oils (HVO).
here. And for those that don't have the aftertreatment
system, it would be the same routing with a couple of
components removed. "
Advanced geometry
A unique component of the 2600 Series is its variable
geometry turbo. While this tech isn't new, its implementation
in an off-highway application as a way of
Continued on page 18
December 2023 15
ALL IMAGES: PERKINS
http://www.sae.org/news/2023/05/agco-core75-engine
Truck & Off-Highway Engineering - December 2023

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