46
1. tilting rod operation 2. lifting rod operation 3. accessary rod operation
4. connecting shaft
5. connecting rod 6. bracket
figure2-55 multiway operation
(5) adjust safety valve pressure
Adjusted pressure for safety is 13.5/16.8MPa
Safety pressure had been set it up by manufacturer, user shall not be setup by
themself.
6.4 Lift cylinder and lift chains.see figure2-56
Lift cylinder piston played on by one-way pressure, consist of cylinder shell, piston rod,piston,
cylinder head etc. Two lift cylinders located on rear of outer mast,its bottom fitted on seat of lift
cylinder of outer mast by pins and bolts, the top of cylinder(i.e. top of piston rod) connect with
beam of outer mast.and there is speed restricting valve layed inside of the right lifting cylinder.
Piston fitted on piston rod by rebound steel wire, piston outer ring is fitted by seal and brace
ring.
There is a stop valve on bottom of cylinder, when mast is up, if high pressure pipe burst
suddenly, this valve can provide safety protection.
There are steel-backed bearing and seal on cylinder head to brace piston and prevent dust.