7788-0047-0 - 28 - 11/04
TROUBLESHOOTING
FAULT
CAUSES
REMEDIES
Reduced vacuum.
Leakage or partial obstruction in
the system components.
The vanes are stuck in their seat.
No lubrication.
Check the valves and elements in
the system.
Flush the vacuum pump with
diesel
fuel (see page 25).
Check the level of the disposable
oil
and dripping of the oiler.
Inverse rotation of the vacuum
pump, with vacuum in the tank.
Non-return valve not hermetically
sealed.
Apply to an authorized service
centre.
Excessive continuous knocking
noise.
Excessive vane wear.
No lubrication.
The vanes are stuck in their seat.
Rev speed too low.
Change the vanes. Apply to an
authorized service centre.
Check the level of the disposable
oil.
Flush the vacuum pump with
diesel
fuel (see page 25).
Increase the number of revs to
above 1500 rpm.
Excessive overheating of the
cooling fluid.
Shortage of fluid in the cooling
circuit.
Components of the cooling
system are clogged.
Dirty heat exchanger.
Faulty heat exchanger.
Unsuitable heat exchanger.
Add fluid and top up the level.
Check the elements in the
cooling system.
Clean it.
Change it, apply to an authiorized
dealer.
Change it, apply to an authiorized
dealer.
Presence of cooling fluid at
discharge.
Leaks in the gaskets.
Apply to an authorized dealer.
Cooling fluid has been used up.
Leaks in the gaskets.
Apply to an authorized dealer.
Overheating of the vacuum
pump.
Operation conditions too harsh or
continuous.
Let the pump cool. Apply to an
authorized service centre.
The pump does not reach rated
pressure, or gets stuck.
Suction of liquids, mud or foreign
bodies.
Flush the vacuum pump with
diesel
fuel (see page 25).
Excessive consumption of
disposable oil.
Use gaskets.
Apply to an authorized service
centre.
If the fault persists, apply to an authorized service centre.
REMOVING FROM SERVICE AND SCRAPPING
Before demolition of the vacuum pump, the following materials must be separated:
- lubricating oil;
- rubber and plastic parts;
- cast iron, steel and aluminium parts;
these must be disposed of appropriately.
• Do not dump the vacuum pump in the environment.
• To dispose of lubricating oil, apply to the special treatment services.
Do not use parts dismantled as scrap for spare parts.
Failure to follow this warning relieves the manufacturer of all responsibility and constitutes negligent
use of the product.
