Follow this procedure whenever a spindle is loosened or replaced, a TRP is replaced, or a spindle motor is loosened or replaced.
A spring scale is used to support the weight of the spindle motor to allow it to “float” for alignment.
Spindle Motor Alignment - EC-400
Remove the spindle motor fan assembly  from the spindle head.
Jog the spindle head up so that the spring scale T-0127  can be installed onto the eye bolt at the top of the spindle column  and the hole in the sheet metal motor lift bracket .
Loosen the (4) motor mounting bolts  until the the washers can be rotated freely.
Slowly jog the spindle head down until the spring scale  reads 125 lbs.
Operate the spindle at 800 RPM tighten the motor mounting bolts to prevent the motor from shifting.
Torque the motor mounting bolts in a star pattern.
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