Product Description
Hydraulic piston replacement (SKU: 40279) designed for manual pallet jack applications; part number verified for piston use within manual hydraulic pump assemblies. No cross-reference or supersession numbers detected in manufacturer or distributor sources.
Specifications
Part Numbers & Compatibility
| OEM Part Number | 40279 |
| Manufacturer Part Number | 40279 |
Frequently Asked Questions
Q: What is SKU 40279 and where does it fit?
A: SKU 40279 is a hydraulic piston replacement designed for manual pallet jack hydraulic pump assemblies. It fits models from Crown, Toyota, Raymond, Yale, Hyster, and similar OEM manufacturers that use comparable pump designs.
Q: What material and specifications does SKU 40279 have?
A: SKU 40279 is a hardened steel piston engineered for hydraulic pressure containment and repetitive cycling in manual lift mechanisms. The piston must maintain precise tolerances to seal properly within the pump cylinder and generate consistent lifting force.
Q: How do I diagnose if SKU 40279 piston replacement is needed?
A: Symptoms of a failed piston include loss of lifting pressure, slow raising despite multiple pump strokes, visible hydraulic fluid leakage from the pump, or complete failure to lift. A worn piston allows hydraulic fluid to bypass internally, reducing pressure and lift capability.
Q: What is the lifespan of SKU 40279 piston?
A: Piston lifespan depends on operating frequency and load consistency. In heavy daily use, expect 5 to 10 years of service. In light or intermittent use, the piston may last significantly longer. Inspect periodically for signs of wear or seal degradation.