Product Description
The Holland 4000644 is a genuine SAF-Holland left-hand fifth wheel locking jaw replacement kit designed for compatible Simplex SE and Simplex II SE fifth wheel assemblies. This kit provides the replacement locking jaw, eccentric jaw pin, return spring, and retaining hardware needed to service worn or damaged fifth wheel locking mechanisms.
The locking jaw secures the trailer kingpin during coupling, while the eccentric jaw pin allows proper adjustment of the jaw position to maintain the required kingpin clearance. Replacing worn locking components helps restore dependable fifth wheel operation and secure trailer connections.
Designed for heavy-duty commercial trucking equipment, the 4000644 features the second-design locking jaw configuration and provides a replacement solution without requiring replacement of the complete fifth wheel top plate.
Manufacturer: SAF-Holland
Brand: Holland / Simplex
Part Number: 4000644
Product Type: Fifth Wheel Lock Jaw Replacement Kit
Release Configuration: Left-Hand
Jaw Configuration: Second Design
Compatible Fifth Wheel Models: Select Simplex SE and Simplex II SE Left-Hand Release Models
Compatible Serial Number Prefixes: S1LS and S2LS
Kit Contents:
1 Locking Jaw (4109939)
1 Eccentric Jaw Pin (4109921)
1 Jaw Return Spring (1200101)
1 Clinch Pin (9900170)
Quantity: One Complete Jaw Replacement Kit
This kit replaces the locking jaw and associated components only. The fifth wheel top plate, release handle, lock assembly, and mounting brackets are not included.
Verify the existing fifth wheel model, serial number, release configuration, and jaw pin design before ordering. The 4000644 is intended for compatible left-hand release configurations and should not be confused with the right-hand jaw kit 4000645.
Installation and jaw-to-kingpin clearance adjustments should follow SAF-Holland's recommended fifth wheel maintenance and rebuilding procedures.
