JSB HUBLOCK LTD
Wheel Hangers
Manufactured from stainless steel with a knurled finger grip, an end slot allows the use of a screwdriver should the tool become stuck.
Supplied in two sizes :
M12 x 1.5 suitable for caravans and most cars.
M14 x 1.5 suitable for motor homes.
Why do wheels fall off ?
One thing that has changed over the years is that wheel studs were part of the wheel hub assembly, so when it came to fitting the wheel you had something to hang the wheel on. You could then fit the nuts at your leisure without having to support the wheel. Today it's more of a struggle, having to locate the wheel bolts whilst holding the full weight of the wheel and tyre. This could be causing problems, as it's quite easy to tighten the bolts to the correct torque setting without realising that the wheel and the bolts are not perfectly seated. This may then result in the loss of a wheel.
The wheel hanger can help to eliminate this problem by supporting the full weight of the wheel and aligning the holes, ready for installation of the wheel fixing bolts.
Perfect seating of the wheels and alignment of the wheel bolts ensures the wheels are fitted correctly, and the loss of a wheel will be avoided.
Wheel Fitting Procedure
First make sure the wheel and hub faces and the bolt threads are clean. With the wheel off the ground, locate two wheel hangers fitted loosely in the 3 and 4 stud positions. The wheel can then be placed in position and the fixing bolts located in the remaining holes and tightened "finger tight" only. The wheel hangers can now be removed and the remaining fixing bolts located, again "finger tight" only. Thump the wheel with the heel of your hand to centre the wheel whilst continuing to tighten the bolts. The wheel can be rotated during this process which will help to centre the bolts. The final tightening, to recommended settings, should be done with the wheel on the ground, and in the correct sequence using a torque wrench.
Check the wheel bolts after 30 miles or 30 minutes of driving.
General information.
It's the CLAMPING FORCE provided by the wheel fixing bolts that holds the wheels firmly in position against the wheel hubs. To maintain the correct clamping force the wheel must be perfectly centred and the fixing bolts aligned and properly seated in their conical mounting holes. The bolts must be tightened in the correct sequence and to the recommended torque settings to achieve the correct CLAMPING FORCE. If the clamping force is maintained there will be no movement between the wheel and the hub, and the bolts will remain in TENSION only with no shear loads.
In practice there is a likelihood that the bolts may not be perfectly centred in their seats, and the wheels will tend to BED DOWN after a few miles of driving. The tension on each bolt may then be uneven and could result in serious lowering of the CLAMPING FORCE.
If left unchecked vibration will produce further movement between the wheel and the hub, causing the fixing bolts to unscrew with possible loss of a wheel.