Hyundai 12ESH Operation Manual page 28

Terminal voltage of storage
9 battery
charging)
Truck body swings during
10
travelling
12．1Method for adjusting relief valve pressure
Relief valve pressure has already been adjusted.
Customers are not allowed to adjust it at will,
otherwise hydraulic system and truck safety will be
endangered, If oil pressure does not live up to
stipulations, adjust it according to test methods
stipulated in JB/T3300 by professional personnel:
1 Screw down high-pressure-oil pipe. Mount a
pressure meter whose range is greater than
20Mpa at outlet of high-pressure oil.
2 Press lifting button and measure system pressure.
For trucks with a rated voltage of 1500KG, the
stipulated system pressure is 13.5Mpa.
3 If the oil pressure does not accord with the
stipulated value, release locknut of relief valve, and
rotate the adjusting screw left and right to adjust the
pressure to the stipulated value. When adjust the
screw inward, the system pressure will increase;
when adjust outward, the system pressure will
decrease.
4 Fasten lock nut after adjustment.
③ Roller wheel of mast stuck
④ Guide rod of mast crooked
⑤ Return oil hole block
⑥ Solenoid valve of hydraulic pump out
of control
① Some single cell damaged
② Battery liquid level low
lowered (after
③ Impurities in electrolyte
① Nuts for fixing driving wheel become
loose or fallen
② Balance wheel, drive wheel and two
front wheels are not in the same plane
Repair or adjust
Repair or adjust
Clean
Exclude fault of solenoid
valve
Repair or replace
Add electrolyte
Replace electrolyte
Fasten locknut
Adjust screws on the
balance wheel to make
the four wheels within
the same plain
Locknut
Pressure adjusting
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