ENGINE - Power Takeoff Section 110-0130 DESCRIPTION AND OPERATION SM - 1361 Numbers in parentheses refer to Fig. 1. The function of the power takeoff (PTO), as the name implies, is to provide the means of mounting and driving an auxiliary component. The tandem pump for the body hoist system and disc brake cooling system is mounted to PTO cover (26) and its input shaft is meshed with the internal splines in the hub of driven gear (12). Refer to Section 230-0050, TANDEM PUMP. The major components of the PTO assembly are; flywheel cover case (1), PTO cover (26), driveshaft (15), drive gear (14) and driven gear (12).
As driveshaft (15) is driven by the engine crankcase, drive gear (14) turns to drive driven gear (12). The tandem pump driveshaft, meshed in the hub of driven gear (12), turns with driven gear (12) to operate the tandem pump which, in turn, supplies hydraulic oil to the body hoist system and cooling oil to the disc brake assemblies. Refer to Section 230-0050, TANDEM PUMP. REMOVAL 1 - Flywheel Cover Case 5 - Oil Seal 6 - Plug 9 - Oil Seal 10 - Bearing 11 - Bearing 12 - Driven Gear 14 - Drive Gear 15 - Driveshaft 17 - Snap Ring 18 - Gasket 26 - PTO Cover Numbers in parentheses refer to Fig. 2.
WARNING To prevent personal injury and property damage, be sure wheel blocks, blocking materials and lifting equipment are properly secured and of adequate capacity to do the job safely. Fig. 1 - Cutaway View of Power Takeoff Assembly the pump before loosening attaching nuts. Remove nuts and lockwashers from pump mounting studs and secure pump clear of the PTO assembly. 1. Position the vehicle in a level work area, apply the parking brake and switch off the engine. 7. Match mark engine flywheel housing and flywheel cover case (1) so that the PTO assembly can be installed in the same position at 'Installation'. 2.
Turn the steering wheel in both directions to relieve pressure in the steering system. Block all road wheels. 8. Attach a suitable lifting device to the PTO assembly and remove bolts (23 & 25) and lockwashers (24) securing PTO assembly to the engine flywheel housing. Carefully lower PTO assembly and spacer (27) from the flywheel housing and move to a clean work area for disassembly. 3. Disconnect driveline from yoke (22) at the PTO assembly. Refer to Section 130-0010, FRONT DRIVELINE. 4. Drain oil from power takeoff housing by removing drain plug (6) from flywheel cover case (1). Reinstall drain plug (6) securely. 9. Remove spacer (27) from the PTO assembly. 5.
Match mark tandem pump mounting flange and PTO cover (26) so that the pump can be installed in the same position at installation. DISASSEMBLY Numbers in parentheses refer to Fig. 2. 1. Remove locknut (16) and hardened washer (19) from driveshaft (15). Pull yoke (22) from driveshaft (15). 6. With suitable blocking or lifting equipment, support SM 1573 Rev 1 1-00 1