Product Description
PISTON
Specifications
Product Overview
| Part Number | 00591-43203-81 |
| Product Type | Hydraulic Pump Piston |
Physical Specifications
| Material | Hardened Steel with Elastomer Seal Ring |
| Primary Application | Hand Pump Hydraulic System |
| Seal Type | Polyurethane or Elastomer |
| Function | Reciprocating pump component for hydraulic pressure generation |
| Reuse/Replacement | Replace if scored, pitted, or seal damaged; cannot be reliably reused |
Compatibility
| Compatible Equipment Type | Manual Pallet Jacks |
Frequently Asked Questions
Q: What does the piston 00591-43203-81 do in a manual pallet jack?
A: The piston 00591-43203-81 is part of the hydraulic pump mechanism. It moves up and down inside the pump cylinder to draw hydraulic fluid from the reservoir and force it into the lift cylinders, creating the lifting action when you operate the handle.
Q: Which manual pallet jack models use the 00591-43203-81 piston?
A: The 00591-43203-81 piston fits standard manual pallet jacks from Crown, Toyota, Raymond, Yale, Hyster, and similar manufacturers. Confirm your pump design matches a positive displacement hand pump before ordering, as piston size and stroke vary by pump model.
Q: What are the signs of piston wear or failure?
A: Replace the piston 00591-43203-81 if the jack requires excessive handle pumps to lift a load, fails to hold pressure, leaks hydraulic fluid from the pump housing, or makes grinding noises during pumping. Worn pistons cannot create adequate pressure and result in slow or no lift.
Q: What material is the 00591-43203-81 piston made from?
A: The 00591-43203-81 piston is machined from hardened steel and typically fitted with a polyurethane or elastomer seal ring. The seal ensures hydraulic fluid remains pressurized and prevents internal leakage. Steel construction withstands repeated cycling and maintains dimensional accuracy.
Q: Can a piston be cleaned and reused or must it be replaced?
A: If the piston 00591-43203-81 is scored, pitted, or the seal ring is damaged, the piston must be replaced. A worn piston cannot create proper sealing pressure and leads to pump failure. Replacement ensures full lifting capacity and prevents hydraulic fluid leakage into the pump body.
Q: How often should the piston be inspected?
A: Inspect the pump piston 00591-43203-81 annually or when you notice a reduction in lift speed or power. In high-use environments or when operating in wet or dusty conditions, inspect every 6 months. Replace if pump performance declines even after flushing the hydraulic system with fresh fluid.