11
07
Troubleshooting
Manual 1865 Rev B p/n 001865 0000
SYMPTOM
PROBABLE CAUSE
REMEDIES
Pump does not reach
end pressure. This is
the lower absolute (best
vacuum) when running
with the inlet closed.
Oil condition is most
often the cause of not
reaching end vacuum.
Drain oil from pump and refill with fresh oil. Run pump
with fresh oil for 15 minutes, and then take a new
pressure reading.
Inlet screen clogged
with debris
Clean screen and check inlet filter element.
Shaft seal leak
Replace shaft seal, from overhaul kit, or call Tuthill
Vacuum & Blower Systems for service and repair.
Vane stuck in rotor slot
Drain oil with flushing oil. Run pump for 15 minutes and
drain. Replace fluid with fresh oil, exhaust filter, and
spin-on filter.
Replace vane.
Call Tuthill Vacuum & Blower Systems for service and
repair.
Anti-suckback valve
stuck in closed
position due to oil
contamination
Disassemble valve and screen, and clean as required.
Drain old oil and replace with fresh oil.
No oil or low oil level in
reservoir
Shut down pump, drain balance of oil, and refill with
fresh oil.
Vacuum fitting or hose
is not leak-tight.
Check hose and pipe connections for leaks.
Radial clearance
between rotor and
cylinder is no longer
adequate.
Overhaul pump, or call Tuthill Vacuum & Blower
Systems for service and repair.
Pump operation is very
noisy.
Coupling insert is worn. Replace coupling insert in motor/pump coupling.
Vanes stuck
Replace vane, or call Tuthill Vacuum & Blower Systems
for service and repair.
Bearing noise
Replace bearings, or call Tuthill Vacuum & Blower
Systems for service and repair.