Hydraulics
191
Troubleshooting guide
8
Fault
Possible causes
Remedy
Cylinder does not retract.
A line or screw connection in the hydraulic system is faulty.
Have the line / screw connection replaced in a specialist
workshop.
A screw connection in the hydraulic system is loose.
Tighten up the screw connection.
The oil is too viscous and too cold.
Ensure that the oil has the requisite operating
temperature and viscosity.
The oil is too old (viscous).
Have the oil changed in a specialist workshop.
Cylinder is frozen.
Defrost the cylinder.
Line break safety device is activated, but no leakage
apparent.
Use the hand pump (apply pressure).
After that turn the hand wheel of the hand pump very
slowly to open it up (release pressure).
Fault
Possible causes
Remedy
Cylinder does not extend.
Supplied quantity of oil is too low.
Check the oil level in the oil container.
Top up oil if required.
The oil is too viscous and too cold.
Ensure that the oil has the requisite operating
temperature and viscosity.
Oil pressure in the system is too low.
Check that sufficient oil pressure is generated by the
tractor unit in the case of a towing connection.
Check that there are no oil leaks, e.g. cracked hoses,
leaky connection points.
Valve wheel on the hand pump is open.
Close the oil valve wheel on the manual pump and
actuate the manual pump once again.
Cylinder is frozen.
Defrost the cylinder.
Summary of Contents for 1000 Series
Page 1: ...GENERAL CAR Program PART 1 OPERATING MANUAL humbaur com 1000 8400 SERIES EN ...
Page 9: ...1 7 Safety ...
Page 21: ...2 19 General information ...
Page 31: ...3 29 Operation ...
Page 67: ...3 65 Operation Trailer safety ...
Page 75: ...4 73 Chassis ...
Page 103: ...5 101 Body ...
Page 134: ...Cover net 5 132 Body ...
Page 135: ...6 133 Electrical system ...
Page 145: ...7 143 Testing care and maintenance ...
Page 185: ...8 183 Troubleshooting guide ...
Page 194: ...Hydraulics 8 192 Troubleshooting guide ...
Page 195: ...9 193 Proof of inspection ...