TM 9-2520-246-34 Section V. DESCRIPTION, OPERATION, AND DATA (MODEL WND-7-28) 5-12. General. Because power takeoff model WND- 7-28 and power takeoff model WN-7-28 are identical, except for the added accessory drive on model WND- 7-28, only the accessory drive will be covered in this section. For the disassembly and assembly pertaining to the remaining portion of power takeoff model WND-7-28, refer to section II for power takeoff model WN-7-28 and use these same disassembly and assembly procedures. 5-13. Description. Power takeoff model WND-7-28 is actually a model WN-7-28 power takeoff with an accessory drive attached. This modification is accomplished by removing the output shaft rear bearing cap from power takeoff model WN-7-28 and replacing it with an oversized bearing cap called a rear output shaft housing (fig. 5-19). The rear output shaft housing contains a shifter shaft and fork that controls the movement of the sliding clutch sleeve. (See fig. 5- 20.) The sliding sleeve clutch slides back and forth on the output shaft gear, thus engaging and disengaging the output shaft. 5-14. Operation. For operation of power takeoff model WND-7-28 see section I, power takeoff model WN-7-28, description, operation, and data. 5-15. Data. National stock number . . . . . . . . . . 2520-00-706-1136 Ordnance number . . . . . . . . . . . . . . . . . . . . . . . 7061136 Manufacturer . . . . . . . . . . . Spicer Div. - Dana Corp. Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WND-7-28 Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heavy-duty Speeds . . . . . . . . . . . . . . . . . . . . . . 2 forward, 1 reverse Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmission Input gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Helical Output shaft (front) . . . . . . . . . . . . . . . . . . 1ΒΌ in. dia, 5/16 in. keyway Output shaft (rear) . . . . . . . . . . . . . . . . . . . . . 7/8 in. dia, 5/16 in. keyway Bearings: Output shaft (front) . . . . . . . . . . . . . Two-ball type Output shaft (rear) . . . . . . . . . . . . . . . . One-ball type Input gear . . . . . . . . . . . . . . . . . . . . Two-roller type Reverse gear . . . . . . . . . . . . . . . . . . Two-roller type Horsepower delivered: 100 rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7 500 rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1000 rpm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Gear pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7/9 in. Backlash (allowable) . . . . . . . . . . . . . . . . . . . . 0.008 in. Figure 5-19. Power Takeoff Model WND-7-28. 5-11