NOTE At the time the cooling system is required to be drained, the coolant in the lube oil cooler should also be drained as described in para- graph 3-199 b. (d) To drain the radiator place suitable container to collect coolant. Remove radiator cap. (e) Open radiator shutoff cock (21) and drain radiator coolant into container. Needle valve (9, fig. 3-34) should be also opened to drain the engine block. (f) Close shutoff cock (21, fig. 3-29) and close needle valve (9, fig. 3-34). 3-42. Hydraulic Cooler (MEP105A Only) Inspection. Inspect fins and lines of hydraulic cooler (19, fig. 3-29) for cracks, breaks, dents, leaks, loose mounting and other damage. 3-43. Hydraulic Sump (MEP105A Only) Inspection. Inspect hydraulic actuator (fig. 3-32) for loose mounting, loose hose con- nections, loose connectors, loose linkage, and other damage. 3-44. Hydraulic Sump (MEP105A Only). a.  Inspection. Inspect hydraulic sump (1, fig. 3-8) for cracks, leaks, breaks and other damage. Inspect filler cap (3) for secure fitting. Inspect seal on tiller cap (3) for excessive wear and other damage. Inspect hydraulic sump sight glass (2) for legibility of marking, loose fitting, and other damage. Inspect hydraulic sump for cracks, loose mounting, leaks and other damage. b. Service. To service hydraulic sump (1, fig. 3-8) refer to table 3-1 and proceeds as follows: (1) Check oil level; level should be up to sight glass (2, fig. 3-8). (2) Remove tiller cap (3). Add hydraulic oil conforming to Military Specification MIL-H-5606 to obtain proper level. (3) To drain tank, place suitable container beneath drain plug (4) and remove drain plug. Repeat step (2) to refill sump tank. 3-45. Hydraulic Filter (MEP105A Only). a. Inspection. Inspect hydraulic filter (fig. 3-8) for cracks, breaks, and other damage. b.  Service. To service the hydraulic filter refer to table 3-1 and figure 3-8 and proceed as follows: (1) Cut lockwire (5). Remove filter body (6) and filter element (7). Discard filter element. (2) Clean filter body with cleaning solvent, Federal Specifica- tion P-D-680 and dry thoroughly. (3) Soak new filter element in clean hydraulic oil conforming to Military Specification MIL-H-5606 to remove air trapped in filter  material. (4) Install new preformed packing (8) and backup rings (9). (5) Apply a light coat of hydraulic oil to the preformed pack- ing (8), and backup rings (9), header (10), and the threads of the filter body (6). (6) Install new element in filter body (6) and fill bowl with clean hydraulic fluid. Install filter body (6) in header (10) and tighten. Lockwire header to filter body on the threads of the filter body. 3-46. Engine Assembly Service. Refer to table 3-1 and service the engine crankcase as follows: a. Check crankcase lubricating oil level using oil level gage (fig.  3-2). b. Remove engine lubricating oil filler cap and add oil as required to obtain full level on oil level gage. See figure 3-1 for proper lubricating oil. c. To drain the crankcase, remove plug and place suitable container at drain hose. d. Open engine lubricating shutoff cock valve and drain oil into container. e. Close shutoff cock and replace plug. f. To refill the crankcase; remove the oil filler cap and add oil until crankcase is full; verify crankcase is full by checking oil lev- el gage. 3-47. Fan Belts Inspection Inspect drive belts (fig. 3-35) for signs of wear, damage or oil soaking. 3-48. Battery Charging Alternator Inspection. Inspect battery charging alternator (fig. 3-36) for cracks, loose mounting, dents, loose or damaged connector, and other defects. 3-49. Speed Switch Inspection. Inspect speed switch (fig. 3-37) for loose mounting, loose connec- tor and other damage. 3-50. Angle Adapter Inspection. Inspect angle adapter (fig. 3-38) for loose mounting, breaks, cracks and other damage. 3-51. Hydraulic Pump and Drive Assembly (MEP105A Only) In- spection. Inspect hydraulic pump and drive assembly (fig. 1-2) for leaks and loose mounting. C h a n g e    11 3-17