Fayat Group DYNAPAC F2500C Application, Operation & Maintenance page 224

Hopper cannot be
swung open
D 40 44
Engine speed is too low
Hydraulic oil level is too low Top up oil
Leak in the suction line
Flow rate regulator
defective
Leaking seals of the
hydraulic cylinder
Control valve is defective
Power supply interrupted
Increase the speed
Tighten the connections
Replace
Replace
Replace
Check fuse and cables; replace
if necessary