Brooks Automation 7. Service Procedures
Part Number: PF40-DI-00010 Rev. A Tensioning the J4 Belt (Before 2014)
NOTE: Prior to 2014 the J3 belt had a simple tensioning procedure described below.
If this did not work due to high friction in the motor mounting flange, then it became
necessary to completely remove the robot controller to accurately tension the J3 belt.
Starting with 2014 shipments, an access hatch was added to the bottom of both the
inner link and outer link to make J3 and J4 belt access easy and belt tensioning more
accurate.
Prior to 2014, to tension the J3 Belt, perform the following procedure:
Step Action
1.
Loosen the (2) Motor Locking Screws on the bottom of the Inner Link. One screw requires a 2.5
mm driver and the second requires a 3.0 mm driver.
2.
Tighten the (2) screws again. The J3 belt is automatically re-tensioned.
3.
The above procedure is an approximate procedure. Its accuracy is limited by the fact that the J3
belt tension will vary according the orientation of the J3 output pulley. The timing belts are very
stiff. A .002 in eccentricity (which is the specified tolerance) in the output pulley can cause a
50% variation in the belt tension, depending on the orientation of the output pulley.
If performing the quick tensions adjustment outlined in Step1 and Step2 does not resolve a J3
instability (loud buzzing noise), it may be necessary to remove the controller and J3 belt cover to
gain access to the J3 belt, and then set the belt tension by using a belt tension meter as
described in Appendix E: Belt Tensions, Gates Tension Meter, while checking for the minimum
belt tension every 10 degrees of rotation of the J3 output pulley. This more extensive procedure
should be required only rarely.
Tensioning the J4 Belt (Before 2014)
Tools Required:
l
Gates Sonic Belt Tension Meter, Model 507C
l
3.0 mm hex driver or hex L wrench
Copyright © 2023, Brooks Automation
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