Scales - Models 410 and 520
— Operation & Maintenance
3-3
Wheel, Hub and Spindle Disassembly and Assembly
2. With the cart empty, use safe lifting device with a minimum weight rating per chart to sup-
port the weight of your grain cart. Place the safe lifting device under the axle, near the tire.
3. Use a 1 1/2 ton lifting device to support the wheel and tire during removal.
NOTE: For straddle duals, first remove the outer wheel and tire.
NOTE: If only changing wheel and tire, skip to Step 8; otherwise continue with Step 4.
• INNER WHEEL AND TIRE MAY FALL FROM HUB CAUSING SERIOUS INJURY OR DEATH.
ALWAYS SUPPORT INNER WHEEL WHEN REMOVING OUTER WHEEL.
4. Remove the hardware retaining the hubcap. Next, remove the hubcap, gasket, cotter pin,
castle nut and spindle washer. Remove hub with bearings from old spindle using a 200 lbs.
lifting device.
5. Inspect the spindle and replace if necessary. If spindle does not need to be replaced, skip
to Step 6; otherwise continue with Step 5.
Remove the bolt and lock nut that retains the spindle to the axle. Using a lifting device
rated for 150 lbs, replace the old spindle with a new spindle. Coat axle contact length of
spindle shaft (scale or non-scale) with anti-seize lubricant prior to installation. If installing
scale spindle, install with ‘top’ decal facing upwards. Reuse bolt and lock nut to retain
spindle to axle. For walking tandem units, use the hole closest to the hub to retain the
spindle. Tighten as outlined in Maintenance Section.
6. Remove seal and inspect bearings, spindle washer, castle nut and cotter pin. Replace if
necessary. Pack both bearings with approved grease and reinstall inner bearing. Install new
seal in hub with garter spring facing the hub by tapping on flat plate that completely cov
-
ers seal while driving it square to hub. Install until flush with back face of hub. Using a
200 lbs. rated lifting device, install hub assembly onto spindle. Install outer bearing, spindle
washer and castle nut.
7. Slowly tighten castle nut while spinning the hub until drag causes the hub to stop freely spin
-
ning. Do not use an impact! Turn castle nut counterclockwise until the hole in the spindle
aligns with the next notch in castle nut. Hub should spin smoothly with little drag and no
end play. If play exists, tighten to next notch of castle nut. If drag exists, then back castle
nut to next notch of castle nut. Spin and check again. Install cotter pin. Clean face for
hub cap gasket and install gasket, grease filled hub cap and retain hubcap with hardware
removed. Tighten hubcap hardware in alternating pattern.
8. Attach the wheel(s) and tire(s) to the hub using the same rated lifting device for removal.
Tighten wheel nuts to appropriate requirements and recheck as outlined in the Wheel and
Tire section of this manual.
9. Raise cart, remove safe lifting device and lower tire to the ground.