Major 1150 Slurry Vac, Operator'S Manual & Parts List

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Troubleshooting
Fault Possible Cause Remedy
Insufficient Pump Output Pump Vanes Sticking Increase Oil Flow
Insufficient Pressure Build-up
Tank Air leak Tighten inspection cover or replace seal.
Pump vanes worn
Replace with complete new set together with
gasket and oil seal.
Pump to tank hose faulty
Tighten clips or renew. Ensure Gate Valves
are closed.
Pump Overheating
Lack of oil in Pump reservoir Fill with SAE 20 oil or in summer use SAE 30.
Oil drip feed blocked. Incorrect oil drip
valve settings.
Clear blockage, set to 1 drop per 3 seconds.
Pump seized
Rotor bent Replace.
Broken pump vanes
Replace with complete new set together with
gasket and oil seal.
Little vacuum or pressure in tank
Blades are worn Replace blades
Some blades are jammed in the rotor
Disassemble Exhauster/Compressor, clean
and wash rotor, blades and body
Air filtration or leakage in system Eliminate infiltrations
Undulated cylinder Smooth or replace body
Reversing gear badly positioned Disassemble and position correctly
Overheating of exhauster/compressor
Flange assembly too light Add a gasket to the back of the flange
Excessive pressure Reduce pressure
Excessive revs Reduce revs
Excessive working time Reduce working time
Blades too long Trim blades to correct size
Lack of lubrication
Check oil level in tank. Functioning of oil
pump, regulation of oil tap
Beat against external surface of
exhauster/compressor
Revs too low Increase revs
Vacuum too high Reduce vacuum
Sewage comes out of exhaust elbow of
exhauster /compressor
Top trap valves working incorrectly Check top trap valves
Fumes come out of exhaust elbow of
exhauster/compressor
Excessive lubrication Adjust lubrication
Lack of circulating lubricating oil in
Exhauster / compressor
Air intake ay pipe fitting Replace pipe fittings
Lubrication tube badly inserted in pipe
fittings
Insert correctly
Air in oil pump chamber Fill pump chamber with oil
Tank does not fill
NOTE: For vacuum pumps, a fill factor
of ca. 90% is normal. A 6” hose has a
capacity of ca 3500 litres/min.
The upper cut-off valve closes too early.
Allow the pump to rotate at a lower RPM. (a
pressure of 0.7 bar is ideal) OR install under
pressure valve on the tank.
Blades of the pump are worn out. Replace the blades.
Slurry is extremely thick. Dilute or mix the slurry
Slurry drain is too deep. Move the drawing-in hose.
Mount a piece of 8” hose at the end of the
hose, with a reducer of 6-8”.
Hydraulic gate valve doesn’t respond
Hydraulic pressure hose is connected
incorrectly
Reconnect correctly
Gas-spring cylinder defect Replace cylinder
Fastening eye of the cut-off valve is broken
(as a result of frost or dirt)
Remove dirt in the cut-off valve box. OR
Replace the cut-off valve.