21
Adjustment methods of safety valve
pressure
The pressure of safety valves has already been
adjusted when the truck is ex-factory. Users shall
not adjust the pressure at will. Otherwise it will
bring danger to the truck’s hydraulic system and
safety. If the oil pressure is not in accordance
with specified value, please ask the professional
personnel to adjust according to the test methods
stipulated in the JB/T3300 standards as well as
the following methods:
1 Screw out high pressure oil tube and install
pressure meter with capacity over 20Mpa at
the high pressure oil outlet.
2 Press lifting operation button to measure the
system pressure. The stipulated system pressure
is 14Mpa for truck with rated load of 2500KG.
3 If oil pressure is not in accordance with the
specified value, please loosen locknuts of
the overflow valves. Turn pressure screw left and
right until the pressure reaches the specified
value. When the screw is turned clockwise, the
system pressure increases. While the screw is
turned counter-clockwise, the system pressure
decreases.
4 After the adjustment, please screw down the
locknuts.
Hydraulic principle diagram
Hydraulic principle diagram
locknut pressure
adjusting screw
