Table 11. Cover Bolt Tightening Torque 4. Install the first hub. It should be mounted so the end of the shaft is flush with surface “A” as shown in fig. 6. It is acceptable for the shaft to extend past “A” as long as it is not past the teeth shown as “B.” 5. Install the second hub with the insert in place. This will set the hubs at the minimum hub gap (G ) dimension, ensuring proper clearance. For specific Min G and G dimensions see table 12. Min max 6. Tighten both hubs securely to the shafts. 7. Check coupling for misalignment (table 13) and align as necessary. 8. Install the cover: a. High-speed cover: Slide the cover over the hub and insert until fully rested against the shoulder of the hub. QF5 through QF175 use standard snap rings to hold the cover in place. QF250 and larger couplings use eight bolts and washers. Use the included hardware to secure the cover. b. Low-speed or high-performance split cover: Place each half over the insert and secure using the four bolt/ washer/nut hardware combinations supplied. For the high-performance split cover bolt tightening torque ratings, see table 11. c. High-speed split cover: Slide the two cover halves over the hub and insert until faces meet. Install the radial outer bolts used to secure the two halves together. Install the bolts to secure the cover to one hub. Revolutions Per Minute (RPM) andBalance The QUICK FLEX coupling is machined on all surfaces and thus its dynamic balance is good. If the coupling is run at a high speed, it is important that the keys used to attach the hubs are the same length as the hub. The set screws should also be changed to full length to fill the hole. Please refer to table 14 for maximumRPM ratings. Note: Shaft should penetrate to base of teeth and hubs should be set at G . Otherwise, the couplingmay not deliver maximum torque. min 21 Quick Flex Couplings Installation Guide WARNING Failure to observe the following warnings could cause the power transmission product to break and parts to be thrown with sufficient force to cause serious injury or death. Contact with moving parts and/or rotating shafts poses a risk of serious injury. Proper guards in accordance with OSHA and American Society of Mechanical Engineers standards must be installed on all power transmission equipment. Power transmission equipment should not be started if proper guarding is not in place. Observe all required lock out/tag out procedures when servicing power transmission equipment. www.jbj.co.uk/couplings.html #DriveLineHarmony Fig. 6. Proper shaft-to-hub engagement.
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