Master Master
Excatech.org
Excatech.org
Our motto fix it once avoid hit and miss techniques
 
 
 
Hydraulic excavator technical support
Privacy_statement
Terms & Conditions
Search by defect
Terminology Slew [see illustration]
Slew - Swing - Turn - Superstructure rotation - (often confused with the movement of a offset boom)
Fault category
Loss of braking - Poor uphill performance - Slow slew/swing - loss of speed - lacking power - Lubrication loss.
Knowledge
Slew systems for excavators follow similar principles for most excavator manufactures, smaller machines have a motor and transmission [see illustration] combination as the size increase so the transmission and motor are separate components. Larger machines are often equipped with two slew motors and transmission. Today the braking of the slew motion is in effect changing the slew motor to that of a pump, this combined with the fluid being forced over a relief valve brake's & stops the slew motion.
The negative brake will apply after the slew motion is at a standstill maintaining the superstructure position in relation to the undercarriage, the brake requires pressure to release relying on spring force to apply.
A slew transmission leaking lubricant from the bottom seal often indicates an impending slew ring bearing failure.
 
Below you may search for publicised documents relating to a specific part of the excavator.
Clicking on the tab will display document which you may select enabling a differing search method, we are interested if you prefer this method so please leave a comment on our contact page.