John Deere 4045 USA4.5 L 4-cylinder engine oil pump service assembling and installation. 

How to install oil pump in John Deere 4045 Engine Used in Tractors, loaders, generators, and excavators of different models.Deere #4045 engine 4 cylinder used in following.
#6020SE Tractor
#6120, 6120SE Tractor
#6215 Advantage Tractor
#6215 Classic Tractor
#6220, #6220SE Tractor
#6320SE Tractor
#6415 Advantage Tractor
#6420SE Tractor
#6515 Classic Tractor (R2)
#5425 Waterloo Tractor
#5525 waterloo Tractor
#310G Backhoe Loader
#310G Backhoe Loader
#310SG Backhoe Loader
#315SG Backhoe Loader
#710G Backhoe
#450H Crawler Dozer (Alt Comp)
#450H Crawler Dozer
#450H LGP Crawler Dozer
#550H Crawler Dozer
#550H LGP Crawler Dozer
#650H Crawler Dozer