Brooks PreciseFlex 400 - Page 148

7. Service Procedures (Undefined variable: MyVariables.ProductName)
Replacing the J2 (Shoulder) Axis
Motor or Timing Belt
Part Number: PF40-DI-00010 Rev. A
Step Action
14.
Unsnap (3) or (4) of the E-Chain harness retaining segments, working up from the carriage, and fold the
E-chain and harness back over the power supply side of the robot to get it out of the way.
15.
Loosen the (3) M3 SHCS and (1) M4 shoulder screw that attach the J2 motor bracket.
16.
Measure and record the distance from the back of the Tension Spring to the carriage, then remove the
M4 X 20 mm SHCD and washer that compress the Tension Spring.
17.
Pull the timing belt up over the idler cam follower closest to the large J2 pulley to release belt tension and
provide enough slack to remove the motor.
18.
If it is necessary to replace the J2 timing belt, replace the belt and reassemble the robot.
Otherwise, skip this step and continue on to Step19.
19.
Loosen the (4) screws and washers that attach the motor mount plate to the Z carriage while supporting
the motor.
It may be easiest to leave these screws in the carriage during this process.
20.
Drop the motor assembly downwards while threading the motor cables through the access hole in the
bottom of the Z carriage, and pulling the timing belt up over the pulley flange.
21.
Remove the motor from the Motor Mount Bracket by removing the (4) M5 X 12 mm SHCS. Attach the
new motor to the Motor Mount Bracket using Loctite 243.
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