INSTALLATION, TIGHTENING AND ALIGNMENT OF DISC WHEELS AND RIMS

Figure 35. - Dual Disc Wheel Installation

Figure 40. - Disc Wheel Tightening Sequence

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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WHEELS, RIMS AND TIRES Figure 38. INSTALLATION, TIGHTENING AND ALIGNMENT OF DISC WHEELS AND RIMS When installing disc wheels or demountable rims with cast spoke wheels, be certain that the threads on studs and nuts are clean to permit correct torquing of nuts. The mounting surfaces of rims, wheels, spacer rings and clamps are free of dirt, rust or damage. Use a wire brush to clean mounting contact surfaces. Do not use lubricant on threads. After rim or wheel has been properly torqued, it should be checked for alignment. This can be accomplished by rotating wheel with a piece of chalk attached to a steady, firm surface and placed to just barely clear outside surface of tire bead seat. This procedure will point out the "high spot." Keep in mind, however, that a "high spot" does not necessarily mean that lug nuts have been unevenly tightened. This condition or misalignment can also result from a bent wheel. The checking of the alignment of the wheel/rim installation is more important on cast spoke rims since the rims can be drawn out of alignment when improperly tightened. Therefore it is important that the following installation procedures be followed. Disc Wheels With Conical Nuts 1. Slide inner/rear or front tire and wheel in position over studs and push back as far as possible. Use care to avoid damage to threads on studs and inspect the valve stem to caliper for clearance. 2. Install the outer wheel nut on front wheels and inner wheel nut on rear dual wheels. Run nuts on studs until the nuts start to contact the wheel. Rotate wheel a half turn to allow parts to seat naturally. CTS-4148A Page 20

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