TM 10-3930-653-14&P Fig. 4-24.  Cover of Hydraulic Pump Driving Chain 19.  Remove     crankshaft sprocket wheel, oil pump sprocket    wheel    and    hydraulic    pump    chain    as    an assembly. Note:   Pull   out   crankshaft   sprocket after  re-moving  attaching  bolts;  pull out hydraulic pump sprocket together with bearing, by hand. Fig. 4-25.  Removing Crankshaft Sprocket Fig. 4-26.  Crankshaft Sprocket CAUTION: Be careful not to damage chain. Fig. 4-27.  Crankshaft Sprocket 20.  Press out bearing from hydraulic pump sprocket with a Bearing Puller. Fig. 4-28.  Removing bearing 21.  Remove front oil seal. Fig. 4-29.  Removing Front Oil Seal 4 - 25