33
7
TROUBLESHOOTING
PROBLEMS
CAUSE
SOLUTION
Clamp not synchronised
1.1 Truck capacity out of valve
capacity range.
Measure the capacity of the forklift truck and if necessary
make it be within the field of capacities foreseen for device
functioning.
1.2 There is mechanical friction on
the guides and/or of the
cylinder of one of the two arms.
The slower of the two arms is
the one with problems.
Carefully lubricate guides. If the problem is not resolved,
censure that there are no foreign bodies trapped in the guide
of the slower arm. Excessive dirt may also cause problems
and requires thorough cleaning and lubrication of the guides.
If it depends on the cylinder grip, the clamp is not able to hold
the load, and may also leak around the rod of the slower
cylinder.
1.3 Flow divider is dirty or damaged Dismantle the flow divider in order to clean thoroughly,
removing any foreign bodies.
If the problems are not solved, replace the flow divider
The clamp does not move
2.1 Oil lacking
Top up the oil level using oil indicated by the forklift truck
manufacturer.
2.2 Oil from the truck distributor
does not arrive.
Contact Truck manufacturer for Assistance.
2.3 If there are quick connections
for connection to the truck, one
or more may be partially
inserted.
Connect quick connections correctly.
2.4 The quick connections would all
appear
to
be
properly
connected, but the problem
persists due to a faulty
connection.
If possible, eliminate quick connections and replace with
standard joints. If it is not possible to eliminate the quick
connectors, replace that which would appear faulty (replace
male and female). Repeat the operation until the problem is
solved.
2.5 Truck’s system absorption is
excessive and simultaneous
calibration of distributor’s max
pressure valve too low.
Increase the calibration of the distributor’s maximum pressure
valve: the distributor’s calibration pressure must be greater
than absorption by the hydraulic system.
The Clamp is slow in opening
and closing movements and
grip is insufficient.
3.1 The relief valve is under-
calibrated
compared
to
requirements.
Tighten valve enough to hold the load. Calibrate checking the
temperature using a full scale 250 bar pressure gauge
introduced in the place of plug M. Careful attention should be
paid not to tighten the valve beyond the calibration of the
truck’s general relief valve.
3.2 Relief valve is calibrated too
low.
Having introduced the pressure gauge, release the relief
valve. If it is calibrated too high, the truck’s general relief valve
will intervene.
3.3 Overpressure
valve
has
excessive blow-bys.
Dismantle the valve in order to clean thoroughly, removing
any foreign bodies. Check that gaskets are intact. In case of
doubt, replace gaskets.
3.4 The pump or other truck
components
prevent
the
desired
pressure
being
achieved.
Introduce a pressure gauge on the pump line and at the end
of the run activate the lift to check the pressure that can be
reached. If the pressure recorded is lower than that declared
by the Manufacturer, call for assistance.
3.5 If the previous check was
satisfactory, there are no
pressure
losses
due
to
equipment on the clamp control
line
The seal of devices positioned between the clamp and the
truck can be checked. In particular, check any capacity
regulators on the line.
The clamp does not have
sufficient force to hold the load.
4.1 See point 2.5
See point 2.5
The clamp does not close, or
closes slowly.
5.1 Relief valve has excessive
blow-bys
Dismantle the valve in order to clean thoroughly, removing
any foreign bodies. Check that gaskets are intact. In case of
doubt, replace gaskets.
5.2 Block valves are dirty.
Dismantle the valve in order to clean thoroughly, removing
any foreign bodies. Check that gaskets are intact. In case of
doubt, replace gaskets.
The clamp, after hold the load,
lose the load
6.1 Block valves are dirty.
Dismantle the valve in order to clean thoroughly, removing
any foreign bodies. Check that gaskets are intact. In case of
doubt, replace gaskets.
6.2 Cylinder oil leakage
Remove and replace the seal kit from the cylinders
