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Retrieving Cores and Deep Coring
When coring holes that are deeper than the core bit:
1. Core the hole. Once the maximum depth has
been cut, remove the bit from the hole and stop
the machine.
2. Remove the core by driving a chisel or slender
wedge into the cut between the core and the work
surface. Other items, such as core tongs, bent wire
or anchor bolts can also be used to remove the
core. Removing cores with diameters greater than
twice their length can be difficult. One method is
to first break the core into smaller pieces and then
remove the pieces.
3. Reinstall the bit using a bit extension, if necessary,
and continue coring.
Troubleshooting
Vibration
1. Stop drilling.
2. Turn core drill off.
3. Remove battery.
4. If the carrier is loose, see "Adjusting Carrier As-
sembly" in the maintenance section.
5. Check for excessive bit runout. Replace if required.
If vibration continues to occur, remove the core and
loose material. If vibration continues to occur after
attempting these measures, return the rig to the
nearest MILWAUKEE service facility.
Bit Binding
Bit binding can occur by a dull "glazed" bit, a poorly
stabilized stand, or particles within a cut.
Causes of bit glazing:
• Wrong RPM for bit diameter
• High feed pressure
• Low feed pressure
• High steel content in work surface
• Large, hard aggregate
• Too little water
• Low motor power
Transporting
1. Remove the battery, and spare battery from the
storage holder on the stand.
2. Remove the machine from the stand.
3. Ensure the machine, stand, and batteries are
secure before transporting.
MAINTENANCE
To reduce the risk of injury, always
WARNING
unplug the charger and remove the
battery pack from the charger or machine before
performing any maintenance. Never disassemble
the machine, battery pack or charger. Contact a
MILWAUKEE service facility for ALL repairs.
Adjusting Carrier Assembly
Over time carrier assembly may become loose and
need to be tightened.
1. Remove drill and all accessories.
2. When the carrier is loose, tighten the four eccentric
shaft/nut assemblies.
a. Loosen the outer nut slightly.
b. Hand-tighten the eccentric shaft with a flat
screwdriver to 1 to 5 in-lb.
c. Manually tighten the outer nut.
NOTE: Over-tightening the assembly will make the
carrier difficult to move up and down.
Carrier lock
dial
Carrier
wheels
Lubricating Rack
Maintain a light coat of MILWAUKEE Type "P" or "J"
Grease on the rack to reduce friction and wear when
the carrier is moved up and down.
Sharpening Procedure for Core Bits
To work efficiently, diamond core bits must maintain
good diamond exposure. Many factors work together
to provide the "controlled erosion" cycle of the ma-
chine's segment to occur. When this "controlled
erosion" cycle is altered, the bit can become dull or
"glazed". Glazing becomes noticeable when the cor-
ing feed rate slows dramatically or the bit does not cut.
Examine the bit immediately. If the diamonds are flush
with the metal, they are underexposed or "glazed".
The following steps will often correct the problem:
1. Reduce water flow until water becomes very
muddy. Continue using as little water as possible
until penetration increases.
2. If the bit does not open up, remove from hole. Pour
into the kerf a thick (1/4") layer of silica sand (the
coarser the better).
3. Resume drilling for approximately 3 to 5 minutes
with very little water and at a lower RPM.
4. Gradually increase water flow to flush sand from
kerf.
5. Repeat as needed.
Maintaining Machine
Keep your machine, battery pack and charger in good
repair by adopting a regular maintenance program.
Inspect your machine for issues such as undue noise,
misalignment or binding of moving parts, breakage
of parts, or any other condition that may affect the
machine operation. Return the machine, battery
pack, and charger to a MILWAUKEE service facility
for repair. After six months to one year, depending on
use, return the machine, battery pack and charger to
a MILWAUKEE service facility for inspection.
If the machine does not start or operate at full power
with a fully charged battery pack, clean the contacts
on the battery pack. If the machine still does not work
properly, return the machine, charger and battery
pack, to a MILWAUKEE service facility for repairs.
9
Eccentric
shaft
Nut
Mounting pin
Carrier lock
shaft
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