20 Standard Coupling Installation Please complete the following steps to install QUICK FLEX couplings. You should have the following pieces before starting the job: » Two hubs. » One insert. » One cover with included hardware. Note: It is critical to identify what style cover you are using, as this will change the hardware included, as well as the installation procedure. A mismatch between the coupling and the applicationmay result in less than optimal performance. There are four types of covers as seen in the diagrambelow. » High-speed cover: QF5 through QF175 use standard snap ring to secure cover in place. QF250 and larger use eight bolts with lock washers. » Low-speed split cover: This cover is free-floating and is located outside the shoulders of the two hubs. All sizes come with four bolts for securing the two halves together around the insert. » High-speed split cover: QF15 through QF250 use eight bolts around the rim to secure the two halves together, QF500 through QF1890 use 16 bolts, and QF3150 and larger use 20 bolts. QF250 and larger use eight bolts with lock washers to secure the cover to one of the hubs. Also available horizontally split. » High-performance split cover: This cover is free-floating and is located on the insert with an internal radial groove. All sizes come with four socket-head cap screws for securing the two halves together around the insert. Installation 1.Check the bore size of the coupling halves and the shafts. Ensure that they are the correct bore size to fit the application. 2.If the coupling does not fit easily, clean and deburr the shafts. 3.Identify cover style: d. If using a high-speed cover, it should be placed on the driven shaft. If space does not permit, then it can be mounted on the drive shaft. If cover uses a snap ring, slide the snap ring down the shaft, then slide the cover onto shaft with the larger opening facing the shaft separation. e. If using a low-speed or high-performance split cover, leave cover aside and continue to step 4. f. If using a high-speed split cover, QF250 and larger, use bolts and washers to secure in place. Slide one half down each shaft before installing hubs. Do not bolt into place until installation is complete. Note: Standard hubs are supplied with a clearance fit and should slide onto the shaft without excessive force. If the hubs have been ordered with interference fit, then industry standards suggest heating the coupling halves to approximately 300° C (572° F) before installing on shafts. If not heated properly, the couplings will not fit on the hub properly. Quick Flex Couplings Installation Guide High Speed Cover Low Speed Cover High Speed Split Cover High Performance Split Cover #DriveLineHarmony www.jbj.co.uk/couplings.html Fig. 5. QUICK FLEX cover types and included hardware.
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