|The following are instructions on how to remove the arbor bracket from
the Delta/Rockwell unisaw prior to returning for rebuilding. Also included are
instructions for replacing the bearings using our bearing kit and reassembly if you want
to do it yourself. Please note- If you are not comfortable doing this, please defer
to a qualified technician. If you would like to send us the bracket, we can rebuild it for
you. Click here for more info on
Before starting, you must first disconnect the saw from the main power. It is not enough to just turn off the power. Unplug the saw and if that is not possible, turn off the main breaker and lock the circuit box. Make sure you have the only key in your pocket..
Removing The Table
Before removing the table, tape two pieces of white paper on it, and then using a straight edge laid flat to the blade, scribe two thin lines at the front and back of the table. This will help with alignment of the table during re-assembly of the saw table.
|Remove the rip fence and any table extensions. This will make it easier to handle the table. If the switch box is located on the bottom of the table, loosen the locknut on the top of the box and spin the whole box off the mounting pipe. There should be enough slack in the wire to do this. Loosen & remove the four bolts on the underside of each corner of the table. You may now lift off the table. Be Careful! The table can be destroyed by dropping it . Use two people for this step. Place the table on some flat boards. Do not stand it up!|
|Now is a good time to clean the inside of your saw. Find and remove the dust chute at the front of the saw. Be careful not to lose the spacers. Take care to note the length of the spacers and where they are installed, since they are not the same length.|
|Loosen the 5/8" bolt that holds the motor in place. Crank the arbor to the full up position, measure and cut a wooden block for under the motor, as shown below|
|The wooden block should support the motor securely. With this in place and the motor bolt loose, crank the arbor down until the tension is removed from the belts. Remove the three belts from the arbor and motor pulley. This part can be a little tricky, so take your time. Be careful not to knock the motor off the support block or you could find your fingers pinched under the belts. Have a friend steady the saw and / or hold the motor.|
|Remove the bolt that tightens the bracket to the arbor support. Note how much of the support shaft is protruding out of the bracket so that you can re-install it back to the original position. You may want to mark its location.|
Using a pry bar or large screwdriver, ease the arbor bracket assembly off the support. Note: the arbor must be in the full up position for this step. Also double check that the motor is well supported as it will tend to move once the arbor is removed. Have someone hold the motor at this point. Don't force the bracket and make sure that the elevating rack is clearing the slot near the worm gear. Watch for the square key that tends to fall out into the sawdust in the base at this point.
|To remove the arbor from the bracket, start by first prying down and flattening the retaining washer that is bent up against one side of the arbor nut. Using a large socket or wrench, remove the nut. Note, if you are reusing the arbor resist the urge to clamp the other end of the arbor in a vice, as this will damage the threads or backing plate, causing excessive blade run out. Instead, mount a set of hardwood blocks in the vice before clamping. Alternately, we use a impact wrench and just hold the arbor flange in a gloved hand. The nut shouldn't be that tight. Using a allen wrench, remove the two set screws in the pulley grooves. These screws usually fill up with sawdust, so take the time to clean out the pockets first. Use a little WD-40 on them. Using a press, press out the arbor using a short centering pin. If a press is not available, gently tap out the arbor with the center punch.|
|Watch for the bearing spacers and thrust washers that will fall out when
the arbor is removed. Set these aside.
Using a spanner wrench or a drift pin, loosen and remove the large spanner nut that retains the other bearing. Once this is removed, the bearing can be knocked out from the opposite end. Clean both bearing seats with fine sandpaper to remove any rust. Inspect the arbor, pulley and bearings to determine what has to be replaced.
|removing the arbor|
|Installing the arbor is the reverse of removing it. Press the outer bearing onto the shaft first, before starting the assembly into the arbor. Being careful not to damage the threads on either end of the arbor. If you purchased the arbor and bearings from us, this step will be done for you before shipping. Next press the other bearing into the bracket and reinstall the spanner nut. Tighten the nut securely. A little loctite can be used here.Install a new spacer over the arbor and up against the bearing. Position the bracket on the bench with the spanner nut down and drop the spacer onto the inner side of the bearing. Now slide in the pulley.|
|Carefully slide the arbor, with the key installed, through the bracket,pulley,spacer and end bearing. Don't forget to replace the thrust washer first and be careful not to pinch it during assembly. Make sure the key slides into the slot in the pulley. Press or tap the arbor home. Turn the arbor over and install the lock washer then the retaining nut. Tighten the nut down hard, and then back it off slightly, about 1/8 of a turn.Using a screwdriver, bend one side up against the flat part of the nut to keep it from loosening up. Now tighten the pulley set screws. Spin the arbor by hand.and make sure everything turns freely. A little drag is normal with new bearings, but you should not feel anything clicking or grinding.||Reinstall the bracket over the support, sliding it to the original position. Make sure that the rack and the worm gear mesh as you do this. Also make sure that you have reinstalled the square key in the shaft.The key can be installed after you install the bracket, if you want. Just raise or lower the bracket until the slots line up and then just slide the key in.|
|Tighten the bold securely, but don't over tighten it. The bracket can be broken if you over torque this bolt. Inspect the belts for cracks or wear. Rough belts will cause rough operation. Install the belts over the arbor and onto the motor pulley. Remove the wooden support block and allow the motor to pivot down. Gently press on the motor to tension the belts and tighten the locking bolt on the side of the motor. Resist the urge to pry the motor down with a bar, as this will over stress the belts and bearings. Later if you find the belts slipping, you can retighten them. At this point you may wish to start the saw and check the arbor. Restore power to the saw and start the motor. Be sure that there is no blade mounted and your hands are clear of the pulleys. Listen for any odd noises. The saw should run smoothly and quietly.|
| If you hear a noise that you can't pinpoint, use a block of wood
about one inch by one inch and about two feet long. Press one end against the arbor
bracket or motor at various places and the other against your ear Don't place the wood
against any moving parts or you will be removing wood splinters from your ear for a while.
If you are not comfortable with this technique, skip this step! Typical noises will come
from rough belts, dry motor bearings, loose pulleys, or defective arbor bearings. If
you think the motor bearings may be at fault, remove the belts and run the motor. Probe
both ends of the motor to isolate which bearing it is. If everything checks out,
disconnect the power, lubricate the trunnions, gears, and elevating racks with a good
spray on grease.
Install the table, and tighten the four bolts on the corners finger tight. Install a good, flat blade on the arbor and using your straight edge flat against the blade, line up the table by aligning the pencil lines on the table with the straight edge. To check the alignment, use two right-angle triangles positioned as above. The triangles can be easily positioned to show the relative alignment of the blade with the slot in the table. Using a soft mallet, you can bang on the corners of the table to adjust the alignment. After alignment is assured, tighten down the table bolts and reinstall the rip fence and extensions, etc.
This completes the repair. After a few hours of running, you may want to go back and tighten the belts.