A skid steer loader with backhoe attachment or a backhoe
loader in general can be very productive if it is
operated safely and efficiently. The best way to
get the job done safely and efficiently is to know
yourself, the job site, and your equipment.

Even though the models of backhoes will vary, there
are safety features with all of them that include
steps and grab handles for getting on and off of
the machine. Backhoes also feature frame lock levers
and attaching levers to keep the backhoe securely
fastened to the loader frame during operation as well
as transporting.

In addition to these standard safety features, there
are some backhoes that provide a safety chain. The
safety chain will prevent the backhoe mounting
frame from rotating backwards and unexpectedly
trapping the operator, which can result in serious
injury or death. Therefore, it is always important
to know and check all of the mounting and attachment
points and the safety chain before you operate the
backhoe.

If you’ve attached the backhoe to the loader, you
should take a moment to inspect it and perform any
necessary maintenance. Check for broken or
damaged parts, also making sure to check for leaks,
cracks, excessive wear, and check the control
levers.

The warning and safety signs and instructional
decals are very important and will help you to
avoid injury. You should always take them seriously
and replace any damaged or missing decals.

Every 8 hours or so, you should grease all of the
zerk fittings, and check the hydraulic fluid
and oil and a daily basis. If the fluid is low,
the backhoe will not operate. Therefore, you
should always take the time to check your machine.

Anytime you have to leave the operator seat of the
backhoe, you should lower the bucket or attachment
to the ground, turn the engine off, remove the
ignition key, then exit the machine.

When the time comes to drive to the next job site,
you should always make sure that you have fully
raised both the front and rear stabilizers and
make sure you’ve put the backhoe seat into the
“down” position for better visibility. Before
you drive off, make sure that you’ve installed the
transport locking pin.

Here are some other things to keep in mind:
- Always select the right size bucket for
the job.
- Stake out the work area that is going to
be excavated and use flags to mark the area.
- Never work in areas that have inadequate
overhead clearances.

Always make sure that you keep bystanders or other
workers out of the swing area. If anyone gets in
the way of the boom swinging, they can very easily
get injured. The machine has no feelings,
therefore you should always be aware of who is
around you and where they are standing.

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Hydraulic machinery are machines and tools that use
fluid power to do the work. Almost all types of
heavy equipment is a common example. With this type
of equipment, hydraulic fluid is pumped to a high
pressure then transmitted through the machine to
various actuators.

The hydraulic pumps are powered by engines or electric
motors. The pressurized fluid is controlled by the
operator with control valves and then distributed
through hoses and tubes.

The increasing popularity of hydraulic machinery is
due to the large amount of power that is transferred
through small tubes and flexible hoses. The high
power density and wide array of actuators can make
use of this power.

Hydraulic power
The theory that lies behind hydraulic equipment is
fluid pressure.
1. A force that acts on a small area can
create a bigger force by acting on a larger area
by hydrostatic pressure.
2. A large amount of energy can be carried
by a small flow of highly pressurized fluid.

Pumps
A hydraulic pump will supply the fluid to the
components in the system. Pressure in the system
will develop in reaction to the load. Pumps have
a power density of around ten times greater than
an electric motor. The pumps are powered by an
electric motor or engine, which is connected through
gears, belts, or a flexible elastomeric coupling
to reduce the heavy vibration.

The common types of hydraulic pumps for hydraulic
machinery applications include:
1. Gear pump – the gear pump is cheap,
durable, and simple. It is less efficient, simply
because it is constant displacement and suitable
for pressures that are below 3,000 psi.
2. Vane pump – vane pumps are cheap, simple,
and reliable. They are good pumps for higher flow
low pressure output.

Hoses and tubes
A hydraulic hose is graded by pressure, temperature,
and compatibility of fluid. A rubber interior is
surrounded by multiple layers of woven wire and
rubber. The exterior of the hose is designed for
resistance against abrasion.

The bending radius of the hydraulic hose is
designed very carefully into the machine, since
a hose failure can be deadly, and violating the
minimum bend radius of the hose can also cause
failure.

A hydraulic pipe is thick enough to have threads
cut into it for connections. It’s rarely used
for high pressure systems though, which prefer to
have tubes or hoses. The pipe itself lends to
weldings and can also be used to fabricate the
manifold.

Hydraulic pipes on the other hand are preferred
over hoses whenever possible, as they are simply
more durable. Tubes are also preferred over pipes,
as they weigh a lot less. Hydraulic tubes will
normally have flared ends and captive nuts to
make connections. They can also be steel welded
with floating nuts and face seal fittings on the
ends.

Both tubes and pipes for hydraulic applications
traditionally haven’t been plated or painted,
since the temperature and oil they operate under
drive away moisture and reduce the risk of rust.

Fittings
The fittings with hydraulic machinery serve
several purposes:
1. To bride different standards, such
as the O-ring boss to JIC or pipe threads to the
face seal.
2. Allows proper orientation of
components, as a 45 or 90 degree, straight, or
even swivel fitting will be chosen as it is
needed. They are designed to be positioned in
the correct orientation and then tightened as
needed.
3. To incorporate bulkhead hardware.
4. A quick disconnect fitting may be
added to a machine without having to modify hoses
or valves.

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There are many different opinions as to what
machines should actually be classified as earth
moving equipment. There are many different types
of equipment that fall in this category, such as
excavators, backhoe loaders, dump trucks, and
even loaders.

Other machinery that falls in between are articulated
trucks, wheel and track tractors, and even
scrapers. The thin line is normally drawn at
motor grades, which are more than capable or light
duty excavation, although they are mainly used
to level lots and grade roads.

If you take a glance at any equipment literature
from leading companies such as CAT, Komatsu, or
Case, you’ll see right away that they believe the
biggest and most important change over the last
several years is increased productivity. This is
normally followed by greater comfort and safety.

The increase in productivity is the result of
many different advancements. CAT (Caterpillar)
cites that more powerful engines with a faster
rise in torque which allows machines to respond
faster to increased power demands. Even though
this new generation is far more powerful, it
has a reduced impact on the environment as well.

Electronics
Most of the newer machines have electronic
control systems that will optimize both engine
and transmission performance, as well as fuel
consumption and hydraulic system performance.

Take for example the CAT mid sized G series
wheel loaders that feature electronically controlled
powershift transmissions. Each and every
transmission offers autoshift capabilities that
ease the pressure on the operator, and an
electronic clutch pressure control that smooth
shifts the gears for longer life.

Comfort
In the industry, good operators are getting harder
and harder to find. Manufacturers find themselves
stressing that operator comfort and convenience
need to be taken into account not only to make
the job easier, but also more efficient and
productive as well.

The new cab designs offer better visibility,
reduced noise and vibration, and improved comfort
as well. The new control systems will require low
operator effort while also improving the control
of the machine for both the experienced as well
as the in-experienced operator.

Easier maintenance
Almost all new machinery offers electronic
monitoring systems that will provide constant
information on the health of the machine for the
operator. These types of systems provide information
to technicians, including service modes that will
help them to diagnose conditions quickly.

Now days, machines are designed to make routine
maintenance easier. With CAT’s wheel loaders,
regular service points are easy to access from
ground level, with site gauges making it easier
to check the fluid of the radiator, hydraulic oil,
and transmission – without having to use dipsticks.

Changes for the better
If you compare the excavation equipment of today
with the machines of the past, you’ll notice that
the changes are better. The machines of the past
relied more on operator skill and technique, as
very few of them had electronic features.

Today, almost all types of heavy machinery offer
electronic features. Electronics are a great
thing, as they can make the life of an operator
easier than ever. You don’t need to get out and
check the fluids anymore, as all you need to do
is take a look at your instrument panel, which can
help to save you a lot of time.

Operators who have a lot of experience know first
hand that machines of the past can’t begin to
compete with machines of today. With technology
always getting better, it just makes you wonder
what is in the future for heavy machinery. Years
from now, one can only begin to wonder just great
heavy machinery will get – and what other features
will make the life of an operator even easier than
it is now.

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Also referred to as a loader backhoe, the backhoe
loader is an engineering and excavation vehicle that
consists of a tractor, front shovel and bucket and
a small backhoe in the rear end. Due to the small
size and versatility, backhoe loaders are common
with small construction projects and excavation type
work.

Originally invented in Burlington Iowa back in 1857,
the backhoe loader is the most common variation of
the classic farm tractor. As the name implies, it
has a loader assembly on the front and a backhoe
attachment on the back.

Anytime the loader and backhoe are attached it is
never referred to as a tractor, as it is not normally
used for towing and doesn’t normally have a PTO.
When the backhoe is permanently attached, the
machine will normally have a seat that can swivel
to the rear to face the backhoe controls. Any type
of removable backhoe attachments will normally have
a seperate seat on the attachment itself.

Backhoe loaders are common and can be used for many
tasks, which include construction, light transportation
of materials, powering building equipment, digging
holes and excavating, breaking asphalt, and even
paving roads.

You can often replace the backhoe bucket with
other tools such as a breaker for breaking and
smashing concrete and rock. There are some loader
buckets that offer a retractable bottom, which
enable it to empty the load more quickly and
efficiently.

The retractable bottom loader buckets are often
times used for grading and scratching off sand.
The front assembly on a backhoe may be either
removable or permanently attached. Often times,
the bucket can be replaced with other tools or
devices. In order to mount different attachments
to the loader, it must be equipped with a tool
coupler. The coupler consists of two hydraulic
cylinders on the end of the arm assembly, which
can expand and retract to allow different tools to
be attached to the unit.

There are several types of backhoe loader brands,
including New Holland, John Deere, and Case. Some
will offer you cabs, while others won’t. The
newer types of backhoe loaders even offer you air
conditioning, radios, and other accessories that
make you feel like you are working with luxury.

Common with excavating jobs, the backhoe can serve
many purposes. It can haul equipment and supplies
in the loader bucket. Another great use is to cover
up dirt when filling in trench lines or covering
up pipe that was just put in the ground. The
backhoe attachment at the rear is ideal for digging
water pipes and sewer pipes.

The best thing about the backhoe loader is the
fact that they are easy to operate. You don’t
need to be a rocket scientist to fully operate this
nifty piece of equipment.

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The harvester is a type of heavy machinery that is
employed in cut to length logging operations for
felling, buckling, and cutting up trees. Normally,
a harvester is employed alongside a forward that
will haul the logs and trees to a roadside landing.

Harvesters were developed in Sweden and Finland,
and today they do nearly all of the commercial
felling in these countries. They work best for
less difficult terrain for the clear cutting area
of forest. For steep hills or removing individual
trees, chain saws are normally preferred. In
the nordic countries, small and agile harvesters
are used for thinning operations and manual cutting
is only used during extreme conditions or by self
employed owners of the forest or wooded area.

The leading manufacturers of harvesters include
Timberjack (which is owned by John Deere) and
Valmet, which is owned by Komatsu.

Normally, harvesters are built on a robust all
terrain vehicle, which can either be wheeled or
tracked. Sometimes, the vehicle can be articulated
to provide tight turning around obstacles. A
diesel engine will provide power for both the
vehicle and the harvesting mechanism through a
hydraulic drive.

An articulated, extensible boom that is similiar
to that of an excavator, will reach out from the
vehicle to carry the head of the harvester. There
are even some commercial harvesters that are
adaptations of excavators with a new harvester
head, while the others are purpose built vehicles.

The normal harvester head may consist of:
1. A chain saw to cut the tree at the
base and also to cut it to length. The saw is
hydraulically powered rather than using a 2 stroke
engine of a portable version. It offers a more
robust chain and a higher output power than any
saw carried by man.
2. Two curved de-limbing knives that can
reach around the trunk to remove branches.
3. Two feed rollers to reach out and grasp
the tree. The wheels will pivot apart to allow
the tree to be embraced by the head of the harvester,
and pivot together to hug the tree tight.
4. Two more curved knives for de-limbing.

All of this is controlled by an operator who sits
in the cab of the vehicle. A control computer is
used to simplify mechanical movements and keep the
length and diameter of trees that have been cut.

The length is computed by counting the rotations
of the gripping wheels. The diameter is computed
from the pivot angle of the gripping wheels that
hug the tree.

Harvesters are normally available for cutting trees
up to 900 mm in diameter, built on vehicles that
weight up to 20 t, with a boom that reaches up to
a 10m radius. The larger, more heavier vehicles
do more damage to the forest, although a longer
reach will help by allowing more trees to be
harvested with less movements required by the
vehicle.

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The bulldozer is a very powerful crawler that is
equipped with a blade. The term bulldozer is often
used to mean any type of heavy machinery, although
the term actually refers to a tractor that is fitted
with a dozer blade.

Often times, bulldozers are large and extremely
powerful tracked vehicles. The tracks give them
amazing ground mobility and hold through very rough
terrain. Wide tracks on the other hand, help to
distribute the weight of the dozer over large areas,
therefore preventing it from sinking into sandy or
muddy ground.

Bulldozers have great ground hold and a torque
divider that’s designed to convert the power of the
engine into dragging ability, which allows it to
use its own weight to push heavy objects and even
remove things from the ground. Take the Caterpillar
D9 for example, it can easily tow tanks that weight
more than 70 tons. Due to these attributes,
bulldozers are used to clear obstacles, shrubbery,
and remains of structures and buildings.

The blade
The blade on a bulldozer is the heavy piece of
metal plate that is installed on the front. The
blade pushes things around. Normally, the blade
comes in 3 varieties:
1. A straight blade that is short and has
no lateral curve, no side wings, and can be used
only for fine grading.
2. A universal blade, or U blade, which is
tall and very curved, and features large side wings
to carry more material around.
3. A combination blade that is shorter,
offers less curvature, and smaller side wings.

Modifications
Over time, bulldozers have been modified to evolve
into new machines that are capable of things the
original bulldozers weren’t. A good example is
that loader tractors were created by removing the
blade and substituting a large volume bucket
and hydraulic arms which will raise and lower the
bucket, therefore making it useful for scooping
up the earth and loading it into trucks.

Other modifications to the original bulldozer
include making it smaller to where it can operate
in small working areas where movement is very
limited, such as mining caves and tunnels. Very
small bulldozers are known as calfdozers.

History
The first types of bulldozers were adapted from
farm tractors that were used to plough fields. In
order to dig canals, raise earth dams, and partake
in earthmoving jobs, the tractors were equipped
with a thick metal plate in the front. Later
on, this thick metal plate earned the name blade.

The blade of the bulldozer peels layers of soil
and pushes it forward as the tractor advances.
The blade is the heart and soul of the bulldozer,
as it was the first accessory to make full use
for excavation type jobs.

As the years went by, when engineers needed
equipment to complete larger jobs, companies such
as CAT, Komatsu, John Deere, Case, and JCB started
to manufacture large tracked earthmoving equipment.
They were very loud, very large, and very powerful
and therefore earned the nickname “bulldozer”.

Over the years, the bulldozers got bigger, more
powerful, and even more sophisticated. The
important improvements include better engines,
more reliable drive trains, better tracks, and
even hydraulic arms that will enable more precise
manipulation of the blade and automated controls.
As an added option, bulldozers can come equipped
with a rear ripping claw to break up pavement or
loosen rocky soil.

The best known manufacturer of bulldozer is CAT,
which has earned a vast reputation for making
tough and durable, yet reliable machines. Even
though the bulldozer started off a modified farm
tractor, it rapidly became one of the most useful
pieces of equipment with excavating and construction.

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Also known as a front end loader, bucket loader,
scoop loader, or shovel, the front loader is a type
of tractor that is normally wheeled and uses a
wide square tilting bucket on the end of movable
arms to lift and move material around.

The loader assembly may be a removable attachment
or permanently mounted on the vehicle. Often times,
the bucket can be replaced with other devices or
tools, such as forks or a hydraulically operated
bucket.

Larger style front loaders, such as the Caterpillar
950G or the Volvo L120E, normally have only a
front bucket and are known as front loaders,
where the small front loaders are often times
equipped with a small backhoe as well and called
backhoe loaders or loader backhoes.

Loaders are primarily used for loading materials
into trucks, laying pipe, clearing rubble, and
also digging. Loaders aren’t the most efficient
machines for digging, as they can’t dig very deep
below the level of their wheels, like the backhoe
can.

The deep bucket on the front loader can normally
store around 3 – 6 cubic meters of dirt, as the
bucket capacity of the loader is much bigger than
the bucket capacity of a backhoe loader. Loaders
aren’t classified as excavating machinery, as
their primary purpose is other than moving dirt.

In construction areas, mainly when fixing roads
in the middle of the city, front loaders are
used to transport building materials such as
pipe, bricks, metal bars, and digging tools.

Front loaders are also very useful for snow
removal as well, as you can use their bucket or
as a snow plow. They can clear snow from the
streets and highways, even parking lots. They
will sometimes load the snow into dump trucks
which will then haul it away.

Unlike the bulldozer, most loaders are wheeled and
not tracked. The wheels will provide better
mobility and speed and won’t damage paved roads
near as much as tracks, although this will come
at the cost of reduced traction.

Unlike backhoes or tractors fitted with a steel
bucket, large loaders don’t use automotive
steering mechanisms, as they instead steer by a
hydraulically actuated pivot point set exactly
between the front and rear axles. This is known
as articulated steering and will allow the front
axle to be solid, therefore allowing it to carry
a heavier weight.

Articulated steering will also give a reduced
turn in radius for a given wheelbase. With the
front wheels and attachment rotating on the same
axis, the operator is able to steer his load in
an arc after positioning the machine, which can
come in quite handy. The problem is that when
the machine is twisted to one side and a heavy
load is lifted high in the air, it has a bigger
risk of turning over.

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As you may know, the CX330 is the upgrade to the
9050B model from Case. The CX330 is quite an upgrade,
being much bigger than the 9050B.

In standard form, the CX330 is almost 5,000 pounds
heavier than the 9050B. This added weight comes
from a larger counterweight and from a redesigned
carbody that will now completely enclose the swing
system.

These added pounds will also contribute to the boost
in the CX330s over-front capacity, and in combination
with higher hydraulic pressures the travel circuit,
give the excavator a very impressive 16% boost in
draw bar pull, which means more power for negotiating
poor underfoot conditions and very steep grades.

In addition to the new features, the CX330s digging
linkage has been enhanced in many ways. The boom
and arm, deeper in cross section to accommodate
higher digging forces, now incorporate V-groove
type welds that are placed by robots and 100 percent
ultra sound inspected.

The boom foot and boom to arm pivots use improved
bushings, new plated pins, and new dust seals that
combine to make a more durable and easier to take
care of assembly. The newly hardened chrome pins
will also contribute to the overall digging linkage
durability.

Even though the basic 6 cylinder, 8.3 liter engine
in the CX330 has been used in Case products since
1985, continual refinement over the years has
changed nearly 85% of the original engine’s part
numbers. The CX330 features 259 net HP with an
air to air intercooler and a free breathing 24 valve
cylinder head.

The electronic logic that controls the new engine’s
fuel system tracks the machine’s operating parameters
and keeps the system continually armed to respond
instantly and precisely to the fuel requirements of
each individual cylinder. The total electronic
design of the engine will also eliminate cable
and step motor controls from the fuel system, with
a large gain in reliability.

Even though modest changes in the CX330s digging
linkage geometry will contribute to the higher
forces of digging, the big guns here are the
refinement of the trench with it’s open center
hydraulic system. The main pressure in the
implement circuit is up almost 8%, with the hydraulic
cylinder diameter up 7% as well.

Hydraulic power
The increase in hydraulic power combines with the
more efficient linkage geometry to yield almost
20% more bucket digging force and 15% more arm
force. With 19 more HP, the CX330 can drive it’s
main hydraulic pumps with much better force. In
addition, the new pumps will produce about 6% more
flow for increased hydraulic speed at much lower
system pressures.

The new PCS (Pro Control System) will manage the
hydraulic system and interface with the 6TAA-830
engine, and does it with more electronic genious
than the 9050B did. Similar to the 9050B, the
CX330 does have manually selected working modes,
although it departs from previous designs by adding
a new automatic work mode. By working in the
new automatic mode, the CX330 can analyze load
demands and operator input at the joystick, then
adjust the engine and hydraulic pumps to balance
power and speed with efficiency and even with the
economy.

Other PCS features include a high speed assistance
system, which will speed up boom and arm functions,
and an automatic power boost system as well. The
power boost system will increase main pressure by
10% for 8 seconds if the implement system reaches
the standard relief pressure for more than 1 second
in tough digging conditions.

With everything the CX330 from Case offers, it’s
truly the best excavtor in years. Case has outdone
themselves this time, doing their part to make
excavating both fun and exciting. If you’ve been
looking for the perfect upgrade from the 9050B, the
CX330 is all that and a bag of chips.

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Sometimes called a forklift truck, the forklift is
a powerful industrial truck that is used to lift
and transport material by steel forks that are
inserted under the load. Forklifts are commonly
used to move loads and equipment that is stored on
pallets. The forklift was developed in 1920, and
has since become a valuable piece of equipment in
many manufacturing and warehousing operations.

Types
The most common type of design with forklifts is
the counter balance. Other types of designs
include the reach truck and side loader, both of
which are used in environments where the space is
at a minimum.

Control and capability
Forklifts are available in many types and different
load capacities. In the average warehouse setting,
most forklifts have load capacities of around
five tons.

Along with the control to raise and lower the
forks, you can also tilt the mast to compensate
for the tendency of the load to angle the blades
towards the ground and risk slipping it off the
forks. The tilt will also provide a limited
ability to operate on ground that isn’t level.

There are some variations that allow you to move
the forks and backrest laterally, which allows
easier placement of a load. In addition to this,
there are some machines that offer hydraulic
control to move the forks together or further
apart, which removes the need for you to get out
of the cab to manually adjust for a different size
load.

Another forklift variation that is sometimes
used in manufacturing facilities, will utilize
forklifts with a clamp attachment that you can
open and close around a load, instead of having
to use forks. Products such as boxes, cartons,
etc., can be moved with the clamp attachment.

Safety
Forklifts are rated for loads at a specified
maximum weight and a specified forward type center
of gravity. All of this information is located
on a nameplate that is provided by the manufacturer
and the loads cannot exceed these specifications.

One of the most important aspects of operating a
forklift is the rear wheel steering. Even though
this helps to increase maneuverability in tight
cornering situations, it differs from the
traditional experience of a driver with other
wheeled vehicles as there is no caster action.

Another critical aspect of the forklift is the
instability. Both the forklift and the load must
be considered a unit, with a varying center of
gravity with every movement of the load. You
must never negotiate a turn with a forklift at
full speed with a raised load, as this can easily
tip the forklift over.

Normally, to drive a forklift, you’ll need to
pass a basic test. They aren’t difficult to
operate, although you’ll need to be safe when you
operate them. Once you have operated one for a
while, you’ll have no problems being safe.

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The company of Case has done it again, by introducing
yet another spectacular excavator, the CX700, which
weighs in at 70 metric tons and represents a new
size for Case, fitting perfectly between the CX460
and CX800 models. Case has also taken advantage of
Tier 3 technologies and upgraded the CX330, increasing
the power and improving fuel economy, all while adding
features that will enhance comfort for the operator
and simplify maintenance.

Power
The CX700 is a powered by a high performance, fuel
efficient Isuzu engine that is completely Tier 3
certified. With an operating weight of 153,400 lbs.
and over 400 HP, the CX700 is capable of digging to
31 feet 11 inches with reaches up to 46 feet 11 inches.

The frame for the CX700 is based on the larger CX800
to ensure optimum durability and reliability,
especially given the powerful performance specs the
machine calls for.

New to the Case CX700 is a switch that will allow
you to give priority to either the boom or the swing
functions. The CX700 also offers retractable side
frames and an optional counterweight removal device,
which makes transporting easier than ever before.

More durable
The Isuzu engine that powers the CX700 is fully
electronic and uses a high pressure rail system that
provides a 5% increase in HP and also gives the
excavator 10% better fuel economy.

Several enhancements have been made to the CX330
upon releasing the CX700, including the overall
reliabilty and durability of the machine, which
includes the strength of the front idlers by beefing
up the thickness and design of the center hub and
improving the track seal design for increased life.

Upgrades
Several of the features that come standard with the
CX700 are upgrades for the CX330 that will also be
applied to other large Case excavator models that
move forward. The key upgrades include ease of
maintenance and servicing. Both the CX330 and CX700
models feature an easy maintenance system, lubricated
bushings throughout the boom and arm, which provides
extended lube periods of up to 1,000 hours. The
engine oil filters are now mounted vertically in
the pump house access area, which allows for easier
access and servicing.

The addition of a modified oil drain plug with a
check valve will make it easier than ever to change
oil. Both the CX330 and CX700 both offer finer
fuel filtration, up to four microns, which provides
increased uptime and improved fuel performance.

The upgraded cooling system features a design that
reduces the stacking of coolers for better cooling
efficiency and also improves access to ease the
removal of debris. In addition to this, the Case
CX700 also features a hydraulically driven,
thermostat controlled reversible fan for improving
the cooling of the engine and easy cleanout of the
materials.

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