How are low speed jacks and high speed jacks used differently ?

Either low speed (L) or high speed (H) jacks could be used in many occasions , but it is recommended to select whichever one is suitable for your intended purpose , taking into account the maintenance in the future .

Grease lubricant is applied to screw jacks to ensure the versatility . Accordingly , while the input shaft rotates at high speed ,it may run out of lubricant over time .

When the rotation speed of the lifting screw is high , select “H” type , and drive the jack at a low speed reverse-calculated from the input shaft rotation . Conversely , when lower speed of the lifting screw is acceptable , but need minor adjustments , it is better to select “L” type and ensure low input speed .

Almost all series have 2 types of worm gear screw jack ratios : jacks for low speed operations ( high gear ratio ) are called “L” , and those for high speed operation ( low gear ratio ) are called “H” .