Dynatech BBM Setup guide

BBM & YBM INSTRUCTIONS [May 2004]
Additional Maintenance
and Repair Instructions
BBM / YBM
Mini Masonry Saw
Issue 1
May 2004
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
DISCONNECT ALL POWER TO THE SAW!
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!
Removing the Motor
1. Remove the two plastic plugs in the blade guard to expose
the two blade guard mounting screws located under the
blade guard.
2. Using a 17mm wrench, turn the blade shaft
screw clockwise and take the screw and
washer out of the end of the shaft. With the
blade shaft screw and washer removed, pull
both blade flanges outward and off the end of
the blade shaft.
3. Insert a Phillips head screw driver into the blade guard screw
access holes and remove the two screws holding the blade guard
on the cutting head casting.
4. From under the blade guard, remove the two screws
located at the bottom of the blade shaft housing
casting and pull the blade guard outward and off the
blade shaft casting housing.
5. Using a narrow tip slot screw driver remove the two white motor
wires in the terminal block.
6. Remove the air filter.
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Removing the Motor [Continued]
7. Using a Phillips head screw driver, remove the four
screws in the back of the plastic motor air intake
cover and slide the housing outward and off of the
motor housing.
8. Using a coin or a wide blade screw driver, remove
the plastic brush cap and carefully pull the carbon
brush out of the motor housing. Remove brushes
on both sides before attempting to pull the motor
housing off of the armature.
9. Using a Phillips head screw driver, remove the four
screws at the front of the motor housing and
carefully slide the motor housing outward and off
the armature.
10.Pull the plastic motor retaining plate out of the cutting head casting
and off the armature.
11.Grab the armature and pull the armature outward and out of the
motor housing.
If the armature does not pull out of the housing, remove the blade shaft retaining plate assembly
and use a long, wide blade screw driver and rubber mallet to tap the armature out of the cutting
head casting. Make sure to place the screw driver against the end of the armature shaft and
NOT against the radial bearing race or against the cutting head casting. Once the armature is
removed, re-insert the blade shaft retaining plate assembly into the cutting head casting. Align
the ears in the blade shaft retaining plate casting with the holes in the cutting head casting and
then insert two screws in the top ears and tighten.
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Replacing the Armature Bearings
1. Use a small gear puller and remove the bearings on both sides of
the armature.
Inner Motor Bearing -- P.N. 235122 35mmx15mm bore 6202LB
Outer Motor Bearing -- P.N. 235112 26mmx10mm bore 6000LB
2. Press the large inner motor bearing onto the fan side of the
armature making sure the bearing “seats” against the shoulder on
the armature shaft.
3. Press the small outer motor bearing onto the back side of the
armature making sure the bearing “seats” against the shoulder on
the armature shaft.
Replacing the Field Windings
1. Use a Phillips head screw driver to remove the two screws holding
the field windings in the plastic motor housing.
2. Using a pair of needle nose pliers, disconnect the terminals
connecting the field winding to the brush holders.
3. From the open side of the housing, pull the field winding out of the
motor housing.
4. With the brush connector edge leading, align the hole in the field
winding with the holes in the motor housing and then push the new
field winding into the motor housing.
5. Insert the two field winding retaining screws and then use a Phillips
head screw driver and tighten.
6. Using a pair of needle nose pliers, re-connect the terminals from the
field winding to the spade on the brush holders.
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Installing the Motor
1. With both bearings in place, push the fan side of the armature into
the cutting head casting until the large inner motor bearing “seats” in
the cutting head casting.
2. Align the plastic motor retaining plate so that the flat sections of the
plate are at the three and six o-clock positions and then push the
plastic plate into the cutting head casting until it “seats”.
3. Slide the plastic motor housing over the armature just enough to
insert the two white field winding wires through the hole in the nine
o’clock position of the cutting head casting. Route the wires so that
they do not come in contact with the fan.
4. Rotate the motor housing until the holes in the housing are aligned
with the holes in the cutting head casting. Insert the four M5 x
25mm long screws and washers then tighten.
5. Insert the brushes and compress the spring then
insert the plastic brush caps and tighten brush cap
until snug. Do not over-tighten! Over-tightening will
damage the brush cap.
6. Slide the motor air intake cover over the motor housing and align the
screw holes in the intake cover with the holes in the cutting head.
Insert the M4 x 16mm long screws and washers into the back of the
air intake housing and tighten.
7. Insert the air filter into the air motor intake housing. Do not ever
operate machine without Air Filter.
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Installing the Motor [Continued]
8. Connect the two white motor field winding wires to the
terminal block in the same location as the black and white
wire coming from the accessory outlet plug.
9. Push the blade guard onto the blade shaft casting housing
and then insert the two screws located at the bottom of the
blade shaft housing casting and tighten.
10.Insert a Phillips head screw driver into the blade guard
screw access holes and align the two screws holding the
blade guard on the cutting head casting and then tighten.
11.Push both blade flanges onto the end of the blade shaft.
Then using a 17mm wrench, turn the blade shaft screw
counter-clockwise and tighten the screw and washer
assembly onto the end of the shaft.
12.Insert the two plastic plugs in the blade guard to protect the
two blade guard mounting screws located under the blade
guard.
Motor replacement complete
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Adjusting the Cutting Head Depth
1. Pull up and twist the pivot lock knob to allow the
cutting head to rest in the full upright and raised
position. Do not lock the head in position. Make
sure the depth lock is disengaged so that the cutting
head pivots freely and is as far up as possible.
2. Using a 5mm Allen wrench, loosen the set screw on
the motor side of the pivot bar. Do not remove the
set screw.
3. Remove the 17mm hex head cap screw on the
motor side of the cutting head pivot bar.
4. Remove the Phillips head screws and pull the
washer out to expose the end of the pivot bar.
5. Using a Phillips head screw driver, remove the two
screws holding the cover located under the back of
the cutting head directly below the pivot lock.
6. Using a 4mm Allen wrench, loosen the two set
screws on the cutting head main angle bracket.
Only loosen the two 4mm screws located above and
below the torsion spring dowel pin.
7. Push the cutting head to the highest possible raised
position and then tighten the heck out of the two
4mm set screws on the cutting head main angle
bracket. Tighten the bottom set screw first then
tighten the set screw facing the front of the saw.
These set screws must be tightened until they “scream” or
the cutting head will slip when the operator presses down
on the handle.
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

BBM & YBM INSTRUCTIONS [May 2004]
Adjusting the Cutting Head Depth
8. Insert the washer with the two alignment holes into
the slot of the upright on the motor side. Insert the
two Phillips head screws and tighten. Lifting up on
the handle will ease tension on the Phillips head screws
while tightening.
9. Push the cutting head to the highest possible raised
position. Squeeze and hold the two uprights “snug”
against the aluminum pivot bar cover tubes and then
tighten the 5mm set screw on the top of the upright
on the motor side. Make sure the cutting head
pivots as far up as possible and make sure to tighten
the 5mm set screw until it screams.
10.Place the blade on the spindle and pivot the head
down as far as possible. If the blade makes contact
with the table, repeat the procedure and make sure
the head remains in the maximum possible raised
position before tightening any of the set screws.
11.Insert the 17mm hex head cap screw, lockwasher,
and washer assembly into the hole in the upright on
the motor side and then tighten the cap screw.
12.Position the torsion spring cover and use a Phillips
head screw driver to tighten the screws that hold
the cover in place.
COMPLETE
NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!

NEVER ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!
BBM & YBM INSTRUCTIONS [May 2004]

BBM & YBM INSTRUCTIONS [May 2004]
NEVER
BBM / YBM WIRING DIAGRAM
ATTEMPT ANY OF THE INSTRUCTIONS WITH POWER CONNECTED TO SAW!