Operation - U.S.SAWS MC-800 Operating Manual

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OPERATION

The U.S.SAWS MC-800 saws are designed for the purpose of:
• cleaning out existing control joints
• Removing existing joint fill material
• Cutting concrete to remove deteriorated concrete for joint
rebuilding
Each one of these tasks is unique in nature and require different blade
configurations.
MC-800 Blade Installation:
To install the blades on the MC800 remove the flanges and spacers.
Install the first blade directly against the inner flange of the blade shaft
assembly. Install a spacer of the desired width and then another blade
and repeat the process until the desired width of cut is achieved. The MC
800 can use one blade or up to 16 blades to achieve a maximum width
of four inches. When the desired width of cut is achieved install additional
spacers so that the blade nut has enough threads to tighten the assembly
but not hit the inside of the blade guard. There may be leftover spacers
which should be stored in a safe place for later use. The outer flange has
a groove cut on the inside of it that helps keep the blades tight and also
assists in loosening the blade when blade changes need to be made. It is
essential that the blade nut is tight and the drive pin nut is also tight. You
may need to use an alternating tightening sequence to achieve tightness
in both fasteners. A common way to achieve this is to tighten the blade nut
then tighten the drive pin nut and then recheck the tightness of the blade
nut and finally recheck the tightness of the blade nut.
Please visit the US Saws YouTube page for a blade installation video if
further information is needed.
Operation:
The MC 800 is designed to be used by one operator however it is often
helpful to have a helper available to move hoses, the vacuum, and ob-
stacles in the path of the cut.
Setting the depth of cut:
With the machine in the off position use the cut engage disengage lever
to lower the blades until they are just barely making contact with the floor.
Use the depth control Jack to achieve this. You may need to raise and
lower the blades several times to get the machine leveled. Raise this the
blades with the cut engage lever and use the depth control Jack to set
the depth by turning the Jack one rotation for every quarter inch of depth.
Once the depth is set you must make an initial cut to check for accuracy.
Do this by starting the saw and lowering the blades into the cut and then
pulling the blades out of the cut, shut the saw off, move it and check the
depth of the cut you just made and adjust if necessary.
Starting the engine:
When starting the engine the blades should be raised and all guards
should be in place.
Open the valve on the propane tank.
Set the throttle to ½ turn the ignition key to start the engine.
Allow the engine to warm up for approximately 30 seconds at half throttle.
Once the engine is warm you may increase the throttle to full speed and
begin your cut.
If the engine is running rough it may be low on propane or may need air
filter service.
O P E R AT I O N
Surface Prep
Division
Cutting/Milling:
Slowly lower the blade stack into the concrete. Do not drop it or force it.
Be prepared for the machine to push back against the operator until full
depth is achieved. Once the blades have reached full depth the opera-
tor may begin pushing the machine forwards. It is worth noting that this
machine is very slow moving forward. The deeper and wider you cut
the slower it will go. Use patience and allow the diamond blades to do
the cutting. Excessive force will create excessive heat and damage the
diamond blades. This machine is intended to be used by a fully capable
adult that has both strength and equipment operation knowledge and
experience.
Dust collection:
This machine must use a dust collector that has a minimum of 350
CFM. It is important to note the inside of the blade guard has a plenum
type dust collection port. If dust is escaping there may be debris in the
plenum. Periodically shut the saw off and check if dust is not being col-
lected efficiently. Removal of polyurea joint fill will also cause blockage
from time to time.
When overlapping cuts it may be necessary to use a smaller less power-
ful vacuum in addition to the main vacuum to collect dust if a portion of
the blade guard is overhanging a previous cut.
P: 877-817- 6687 F: 813-621-7125
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