HP Pagepro 452 in Leeds, West Yorkshire with random paper jams from the main paper cassette, this was caused by a worn paper feed kit, the separation pad assembly had worn down on one side and this was causing the paper jams, HP produce a paper feed kit assembly, part number CN598-67018 and in this kit you get a paper pickup roller, a separation pad assembly and an pickup roller installation tool.
The kit also fits the following models
HP OfficeJet Enterprise Color Flow MFP X585z, MFP X585dn, MFP X585f
HP OfficeJet Pro X451dn, Pro X451dw, Pro X476dn MFP, Pro X476dw MFP, Pro X551dw, Pro X576dw MFP
HP PageWide 377dw MFP,
HP PageWide Enterprise Color 556dn, 556xh, Flow MFP 586z, MFP 586dn, MFP 586f
HP PageWide Pro 452dn, Pro 452dw, Pro 477dn MFP, Pro 477dw MFP, Pro 552dw, Pro 577dw MFP, Pro 577z MFP
HP paper jams