Bucher 4W/2P Valve | PM-3554 / Long-Valve PM-3551

The Bucher 4W/2P Valve (P00455D) is the directional cartridge for the Bucher PM-3554 and the long-valve version of the PM-3551. It restores smooth power-up / power-down control on a 2-way pump that's lost crisp directional response — a common before-rebuild service part. How do I know if I need the 4W/2P valve replacement? Cylinder extends and retracts but the response feels sluggish or sticky. Cylinder doesn't fully reach pressure on extension or retraction. Audible chatter or buzz from the valve manifold under load. Any of those means the cartridge spool is sticking or wearing — replace before it strands you. 4-way / 2-position directional valve cartridge Direct OEM fit for Bucher PM-3554 and the long-valve PM-3551 Restores accurate cylinder extend / retract control Drop-in replacement — no adapters or re-plumbing Pierce SKU P00455D For the bale-spear HPU this valve fits, see the Bucher 2-Way Bale Spear HPU (PM-3554). For the 3W/2P version that fits the PM-3530, see the Bucher 3W/2P Valve (P00679-D).