Hyundai 110D-7A User Manual

6-32
Problem
Problem
Large fork lowering speed.
Large spontaneous tilt of
mast.
· Seal inside control valve defective.
· Oil leaks from joint or hose.
· Seal inside cylinder defective.
· Tilting backward : Check valve defec-
tive.
· Tilting forward : tilt lock valve defect-
ive.
· Oil leaks from joint or hose.
· Seal inside cylinder defective.
Cause
Cause
Remedy
Remedy
Slow fork lifting or slow mast
tilting.
Hydraulic system makes
abnormal sounds.
Control valve lever is locked
High oil temperature.
· Lack of hydraulic oil.
· Hydraulic oil mixed with air.
· Oil leaks from joint or hose.
· Excessive restriction of oil flow on
pump suction side.
· Relief valve fails to keep specified
pressure.
· Poor sealing inside cylinder.
· High hydraulic oil viscosity.
· Mast fails to move smoothly.
· Oil leaks from lift control valve spool.
· Oil leaks from tilt control valve spool.
· Excessive restriction of oil flow pump
suction side.
· Gear or bearing in hydraulic pump
defective.
· Foreign matter jammed between sp-
ool and valve body.
· Valve body defective.
· Lack of hydraulic oil.
· High oil viscosity.
· Oil filter clogged.
· Clean or replace.
· Clean or replace.
· Replace.
· Replace seal.
· Replace spool or valve body.
· Replace.
· Replace packing.
· Add oil.
· Bleed air.
· Replace.
· Clean filter.
· Adjust relief valve.
· Replace packing.
· Change to SAE10W, class CF engine
oil.
· Adjust roll to rail clearance.
· Replace spool or valve body.
· Replace spool or valve body.
· Clean filter.
· Replace gear or bearing.
· Clean.
· Tighten body mounting bolts uniform-
ly.
· Add oil.
· Change to SAE10W, class CF engine
oil.
· Clean filter.
2. TROUBLESHOOTING
2. TROUBLESHOOTING
SYSTEM
SYSTEM
1)
1)

Hyundai 110D-7A Specifications

General

Brand	Hyundai
Model	110D-7A
Category	Forklifts
Language	English