Diamond Products CB744 Operator's Manual page 11

WARNING: Never allow water to enter the motor. It could lead to an electric shock.
WARNING: Check all connections of the water feed system to ensure there are no leaks. Inspect hoses
and other critical parts which could deteriorate.
WARNING: The maximum water pressure should not exceed 70 psi (4
bar).
CAUTION: There is a small indicator hole on the water feed collar. If this
hole leaks water, it indicates that the water seals are worn out. Replace
them immediately.
CAUTION: Never use this machine without water feed. Running dry will
overheat and destroy its water seals.
Use a water collector with a wet vacuum to collect cooling water if nearby objects could be damaged by water.
WARNING: Never allow water to enter the motor. A perfectly functioning water collector set up must be
used for any drilling performed at an upward angle.
3) SELECTING SPEEDS
There are various ranges to suit the bit size and work piece hardness. Choose the slowest speed for large
diameter bits and hard materials. If when cutting the bit stalls repeatedly, then you must change to a lower
gear. If you are already in the lowest gear and the bit stalls repeatedly, then you are using the machine over its
maximum capacity.
CAUTION: Never attempt to change gears on a running machine! Only adjust when the machine is
at rest.
Turn the two gear selectors to the correct combination of A,B,C and D to reach the desired speed range. (see
the chart below)
GEAR SPEEDS
Speed 1: AD n
385/min, n 225/min
0
Speed 2: AC n
530/min, n 300/min
0
Speed 3: BD n 975/min, n 565/min
0
Speed 4: BC n
1340/min, n 780/min
0
( Recommended bit size based on average hardness concrete. Speeds will
vary with different material hardnesses. For reinforced concrete, speeds will
be signifigantly slower.)
RECOMMENDED BIT Ø
12" - 18" (320-450mm)
7' - 12" (180-320mm)
5" - 7" (125-180mm)
3/4" - 5" (20-125mm)
11
Indicator Holes
Gear Selectors