Cummins/Onan — STARTING SYSTEM

For these Cummins/Onan models: NH-MS/1, NH-S/1.

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Procedure

1. Loosen the M terminal nut on the magnetic switch and remove the connector. Then unscrew attaching screws and remove the magnetic switch. NOTE: The packings for the magnetic switch are mounted so that the steel packing 1s located in the front bracket side.
2. After removing the thru bolts, the starting motor can be divided into three parts — the front bracket, housing and rear bracket. The spacing washers shown in Figure 32 are used for adjustment of FIGURE 31. MAGNETIC SWITCH REMOVAL FIGURE 32. REMOVING THROUGH BOLTS the thrust gap of the armature shaft and are placed between the rear bracket and the commutator. NOTE: These washers are inserted so the steel washer 1s located in the commutator side.
3. The armature can easily be removed from the front bracket. Be careful not to miss a small steel washer used in the end of the armature shaft. The shift lever can be removed along with the armature when it is removed. In this case, the spring holder, lever springs and retainer can be taken out before the lever. See Figure 33. 1 he FIGURE 33. REMOVING ARMATURE
4. Remove the ring after driving the pinion stopper

Source: manual:940-0402 Onan NH (spec A-D) Industrial Engine Operators & Parts manual (01-1973).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.