Spring Extension for Electric Lift Truck

Frequently Asked Questions

Q: What is the purpose of the A000036539 spring extension in lift equipment?
A: The A000036539 spring extension is a mechanical spacer and spring mount component that extends the travel distance of tension springs in hydraulic relief valves and load-holding circuits. It allows proper spring preload adjustment while maintaining circuit safety and response performance.

Q: What are the dimensions and material specifications?
A: The A000036539 is fabricated from ductile iron with a working length of 2.25 inches and a 1.5-inch mounting diameter. The extension rod diameter is 0.375 inches with M10 x 1.5 metric threads at the spring attachment end. Maximum compressive load rating is 400 pounds.

Q: How do I diagnose if the spring extension needs replacement?
A: Replace the A000036539 if the hydraulic relief valve chatters or opens erratically, if the spring becomes loose and rattles in the bore, or if the threaded end strips and the spring assembly becomes detached. Corrosion on the rod or stripped internal threads also warrant replacement.

Q: What is the expected service life of this extension?
A: The A000036539 typically lasts 10 to 14 years in standard operation. Corrosive storage environments, high-pressure cycling, or thermal cycling reduce lifespan to 6 to 8 years. Proper drainage and corrosion protection extend service life significantly.

Q: Are there cross-reference part numbers available?
A: The A000036539 corresponds to Toyota part number 67-3FD25 and Jungheinrich part number 50038948. Verify the rod thread pitch and compression rating when substituting, as slight dimensional variations affect valve response.