Adjustment of Wheel Hub Bearing Clearance
Improper adjustment of bearing clearance will shorten the service life directly. When the clearance is too small, the bearing will be heated and burnt quickly; when the clearance is too large, the contacts between the roller and inner/outer ring will decrease obviously, only a few rollers are bearing the entire load, this will cause damages to inner and outer raceways. Therefore, the adjustment of bearing clearance is critical for axle.
After initial travelling of 5,000 kilometers and subsequent normal travelling of 100,000 kilometers or after replacing the lubrication grease, the bearing clearance must be adjusted.
Adjustment procedures of bearing clearance
- Cushion the two supporting points of axle (near spring seat) with plank or steel plate; lift the axle with jack, and prevent the jack from contacting the axle directly.
- Remove the hubcap, O-ring, cotter pin and other elements after contacting the brake once.
- Use an especial octagon-socket for shaft end together with the torsional spanner, fasten the nut to specified torque (350~400 Nm) while rotating the hub. If no proper torsional spanner is available, use the socket spanner to fasten the nut until there is a feeling of block during the rotation of the hub.
- Rotate the nut reversely by 1/12~1/8 circle; make sure one slot on the nut is aligned with the cotter pin at the shaft end.
- Insert the cotter pin, bend the pin endplate slightly
- Install the seal ring and hubcap, fill enough lubrication grease in the chamber and fasten the hubcap, fastening torque: 280~320 Nm. The fastening torque of hubcap for Germany-type bearing is 700 Nm and the fastening torque of ECO hubcap is 800 Nm.
Check whether the hubcaps are fastened
Check whether the hubcaps are fastened with devoted socket spanner and torsional spanner or other power tools.
Under especial conditions, an extension bar can be used to fasten the hubcap together with the socket spanner, knock the handle or bar with hammer or other sticks if necessary.
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Chinese Economy Surprisingly Strong
Chinese industrial output and other economic data was surprisingly on the upside in August, suggesting its recovery is on a solid course but not so strong that Beijing will need to hit the policy brakes anytime soon.
Asian shares edged up as the data supported regional recovery hopes, while the Australian dollar cut losses against the dollar and yen and oil prices rose above $72 a barrel.
The only weak spot in August's data was trade. Exports fell 23.4 percent from a year earlier, a sharper drop than expected and accelerating from July's 23 percent fall as global demand remained frail. Clearly, it shows the domestic economy is doing much better because of the (government) stimulus, and external demand is still quite weak, said Tao Wang, economist with UBS in Beijing. I don't think weakness in exports is going to derail the fact that the general economy will continue to recover.
Industrial output grew at a 12-month high of 12.3 percent in August from a year earlier, jumping from 10.8 percent in July and moderately beating expectations, data issued by the National Bureau of Statistics showed on Friday. Investment growth also picked up a touch, and annual growth in the broad M2 measure of money supply rose to a record-high 28.5 percent. Despite the signs of strength and the potential for mid-term inflationary pressures from such rapid liquidity growth, analysts expect policymakers to proceed cautiously and avoid pulling on the reins of monetary and fiscal policy too quickly.
But not all analysts were convinced China should be looked to as an engine of global growth. Stephen Roach, Morgan Stanley's Asia chairman, told Reuters that China was unlikely to lead the global economy out of recession because its own recovery lacks balance and is overly reliant on investment.
Continuing weakness in exports underlined the fact that China will have to continue to rely on domestic demand to drive growth in the coming months, even as the impact of the government's $585 billion stimulus package starts to wane.
Real estate investment rose 14.7 percent in the first eight months from a year earlier, compared with a low of 1 percent hit in the first two months. |
