JAMMED UP !! 5 Ton Hydraulic Bridge Overhaul and Mods
Channel: HYDRAULIC.ONLINE GOLD COAST
Date: 12/07/2021

An 11,000 pound (5000 Kg)  bridge at a stadium, is hydraulicly raised and lowered with two telescopic cylinders, trouble is, it keeps getting jammed and putting excessive strain on the guide rails and wheels.  

We give its hydraulic system a 10 year overhaul, including 
-Replace all Hydraulic Hoses. 
-Strip and clean Paint and Reseal the telescopic cylinders
-Adust the Powerpack Pressure Relief valve and pressure switch.     
-Clean out the hydraulic oil tank and the oil suction filter, 
-Check and adjust the Gaps on the Velocity Valves on the Telescopic cylinders.
-Adjusted all the guide roller clearances and alignment. 
-Tightened the Guide Roller Rails. 

We then added a mechanical cable stabilising and balancing system.
 
This cable system is similar to those used in hydraulic car hoists,  it keeps the bridge horizontal and prevents the bridge from jamming while being raised and lowered.