Truing Wheel

1. install truing arbor in wheel hub and place wheel in Wheel Truing Stand, Part No. 951™0-29-Secure arbor nuts so that hub will turn on its bearings.

2. Turn each nipple on just far enough to cover spoke threads.

3 Start at valve hole and tighten all nipples three full turns each, using special Nipple Wrench Par No. 94681-39. If further tightening is needed to pull spokes snug, tighten all nipples one full turn at a time until spokes are snug.

4. Check rim for centering sideways with hub for running true sideways and concentricity Centering r^nT sideways with hub and truing rim sideways must be done as one operation.

Rim must be properly centered sideways in relation to hub for correct alignment and "t™^'* , . wheels Fie 2C-6 shows method of using a straightedge to^determine correct sideways centering ff wheel rims. Straightedge should be a perfectly straight metal bar. To adjust sidewise centering, loosen a "nipples on one side and tighten all nipples on opposite side same amount.

For 16 in. *heel (5.00 in. tire), place straightedge across rim on brake side and measure the distance from straightedge to brake side spoke flange of hub. When rTm is correctly centered, this distance will be

For 18 in wheel (4.00 in. tire), lay straightedge across brake side spoke flange of hub and measure distance from straightedge to rim. When rim is correctly centered, this distance will be 1/4 in.

Adjust truing stand gauge to side of rim as shown in Fig2C-7 so rim at highest point will strike gauge as wheel is rotated slowly. Loosen nipples at highest nnint of rim on gauge side and tighten nipples onop-nosite side the same amount. Repeat this operation Snm rim runs true sideways. Reverse loosening and tightening of nipples as explained above if rim moves oo far aVay i gauge. After each loosemng and tightening of spokes, check rim m relation to hub as eilaTned in ateve paragraphs. Rim should be trued to within 1/32 in. sideways run-out.

After rim has been centered sideways with hub ind runs true sideways, check it for concentricity Adiust truing stand gauge to circumference of rim as shown in Fig 2C-8. if rim runs eccentric (out of round) nipples must be loosened at points rim does not contact gauge Sid nipples tightened at points rim contacts gauge! Amount nipples are to be ^sened or tightened is determined by the amount rim runs eccentric. Rim should be trued to within 1/32 in. concentrically.

. After above operations have been checked and corrected, ^¡tart a?t valve hole and ^ ^ples one turn at a time all the way around rim until spoKes are normally tight. While tightening nipples, repeatedly check rim with gauge according to instruc tions in step 4.

After all nipples have been pulled up until spokes are nonrially tight and wheel is true, or nearly so, seat dSffl


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