Air Shifter Shaft Installation

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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Fig. 33 11. Check fit between the split ring, underdrive pinion gear and the input shaft split ring groove. 12. Temporarily fasten the input shaft rear cover (Item 25) or the PTO assembly (See Section J for instructions on proper assembly of the PTO unit) in place with the mounting bolts torqued to 25 lb. in. 13. Use feeler gauges to measure the distance between the input shaft rear cap (or PTO assembly) and the case housing (See Fig. 33). Add .005" to this dimension and make a shim pack (Item 16) equal to the dimension thus calculated, or at a maximum, .005" larger than the calculated dimension. 14. Remove cap (or PTO), position shims, install cap (or PTO) attaching with screws that have been coated on the threads with Permatex. When installing the PTO unit, lightly coat under the heads of the two long cap screws. H. Air Shifter Shaft Installation Refer to Page PM7 and Page PM10 1. Install two o-rings (Item 3) into the grooves on the outside of the shift cylinder adapter tubes (Item 15). Coat adapters with gear lubricant or Lubriplate and install in the counterbored shift shaft holes, on the front of the case housing for the front drive shift and on the rear of the case housing for the high- underdrive or high neutral-underdrive-shift. Fig. 34 2. Place a small (piston-to-shift-shaft sealing) o-ring (Item 11) over the threaded end of each shift shaft. The shallow counterbore in the piston (Item 9) should be toward the shoulder on the shift shaft; the deep counterbore provides room for the retaining nut. Install the piston retaining washers (Item 7) in the deep counterbore of the piston over the end of the shift shaft. Install piston retaining nut (Item 6 or 39). The nut used on the two groove shift shaft will be a special oversized nut (Item 39) if the transfer case is equipped with a PTO unit. Tighten nut to specification and tighten the nut locking set screw (Item 40) into the end of the special nut (Item 39-if case has a PTO unit). See Fig. 34. 3. Install a spring on the two main or longer shift shafts (Item 12 and 36) against the piston. Place a nylon stop ring (Item 13) over the end of each shift shaft. 4. Start the set screws into the shift forks. Put them in as far as possible and still allow the shift shaft to slide through the hole. -23-

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