Troubleshooting - Hazet-Werk 4932 N-110 Betriebsanleitung

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7. Troubleshooting

MALFUNCTION
The pump does not
start.
The pump fails to
operate under load.
The pump operates
but does not pressur-
ize the oil.
The pump does not
reach maximum pres-
sure.
The pump generates
pressure but the load
does not move.
The piston com-
presses although the
"RELEASE" pedal has
not been pressed.
The piston does not
compress (single-
action cylinder).
The piston does not
retract (dual-action
cylinder).
Insufficient pump
output.
Design and function
3
POSSIBLE CAUSE
The compressed air supply is
closed or blocked.
Internal mechanism is not suf-
ficiently lubricated.
Compressed air pressure is too
low. Air filter is contaminated or
blocked.
Oil is leaking from the hydraulic
system.
Leakage point on the pump.
Oil level too low.
Compressed air pressure is too
low.
Safety valve out of adjustment.
Oil is leaking from the hydraulic
system.
Overloading. The oil does not
circulate correctly.
Oil is leaking from the hydraulic
system.
Defect in the pump.
Oil supply trapped or plug con-
nection incorrectly connected.
In the case of return under the
force of gravity: deficient load-
ing on the cylinder.
Cylinder springs defective.
Cylinder drain valve malfunc-
tions.
Oil supply trapped or plug con-
nection incorrectly connected.
Cylinder drain valve malfunc-
tions.
Compressed air pressure is too
low.
Air filter is contaminated or
blocked.
Tank has not been bled.
REMEDY
Ensure that compressed air is reaching
the pump.
Insert a couple of drops of oil into the
compressed air hose.
Ensure that the supply pressure (com-
pressed air) of the pump is between 5
and 7 bar.
Check whether there is a leak and repair
where necessary.
Check whether the pump is leaking, and if
so return it to the manufacturer for repair.
Check the oil level and top up if neces-
sary.
Ensure that the supply pressure (com-
pressed air) of the pump is between 5
and 7 bar.
Contact the manufacturer.
Check whether there is a leak and repair
where necessary.
Reduce the load.
Check whether the lines are trapped
or blocked, and whether the cylinder is
defective.
Check whether there is a leak and repair
where necessary.
Check the leakage point in the pump and
contact the manufacturer.
Check oil supply.
Weigh down cylinder.
Repair cylinder.
Repair cylinder.
Check oil supply.
Repair cylinder.
Ensure that the supply pressure (com-
pressed air) of the pump is between 5
and 7 bar.
Bleed the tank as described in chapter
3.6.
17