Product Description
Rocker Arm Assy (670mm) Hyster, HY4028403
Frequently Asked Questions
Q: What equipment does the HY 4028403 rocker arm assembly fit?
A: The HY 4028403 is a genuine Hyster OEM rocker arm assembly measuring 670mm in length. This part is used in Hyster electric pallet jacks and lift trucks to connect the lift cylinder to the mast linkage. Verify your specific equipment model and serial range before ordering, as fitment varies across Hyster product lines.
Q: What material is the HY 4028403 made from?
A: The HY 4028403 rocker arm assembly is manufactured from ductile iron or steel depending on production batch. The 670mm length and design provide strength for cylinder load transfer under rated capacity. Material composition ensures resistance to fatigue cracking from repeated lift cycles.
Q: How long does the HY 4028403 rocker arm assembly typically last?
A: The HY 4028403 is an OEM component rated for the service life of the equipment under normal operation. Lifespan depends on equipment duty cycle, maintenance of pin connections, and proper lubrication of pivot points. Wear typically occurs at pin holes and bushing surfaces rather than the arm itself.
Q: What are common failure symptoms for the HY 4028403?
A: Signs of wear include excessive slack in the rocker arm assembly, clunking noises during lift operation, uneven mast movement, or visible cracks at the welds. Loose pins or worn bushings at attachment points will cause play between the arm and pivot points. Replace the assembly if cracks are present or play exceeds 5mm.
Q: Are there cross-reference or equivalent part numbers for the HY 4028403?
A: The HY 4028403 is a Hyster OEM part number. No direct cross-reference to other manufacturers has been identified in standard parts databases. Order using the exact SKU HY 4028403 to ensure correct fitment. Do not substitute with aftermarket rocker arms without verifying dimensions and mounting points.