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TROUBLE SHOOTING
ALWAYS TURN OFF AND LOCK OUT POWER AND WAIT UNTIL ALL PARTS ARE
STOPPED PRIOR TO PERFORMING ANY MAINTENANCE. FAILURE TO HEED MAY RESULT IN SERIOUS
PERSONAL INJURY OR DEATH.
PROBLEM
Material has plugged the
auger or material has
hardened inside the auger.
Material not desired moisture
when startup.
Screw press is running, but
solids discharge
inconsistently.
Screw press shuts off
repeatedly.
Screw press amps exceed
overload setting, or screw
press intermittently vibrates
excessively.
Screen is breaking or has
less than average product
life.
Screw press makes grinding
noises while running.
Gearbox temperature is
higher than normal or is
running loudly.
Liquid leaks out the inlet of
the screw press body.
NOTE: Chart is not all-inclusive of problems or remedies. Contact your dealer or Valmetal for further assistance.
Refer to the MAINTENANCE sections to perform remedy service called for in the above chart.
www.valmetal.com
POSSIBLE CAUSE
1. Material was too dry and pressure caused
it to plug.
2. Environment was freezing.
3. Excessive gap between auger and tunnel. 3. Replace auger screw.
1. Not enough pressure is applied.
2. No plug was existing, and material is not
being pushed.
1. Too much pressure being applied to
discharge doors.
2. Screw press is plugged.
3. Shaft may be spinning, but auger screw is
not.
1. Hopper overload sensor is being tripped.
1. Screw press is plugged with trash or
debris.
2. Too much pressure being applied to
discharge doors.
3. Auger screw is worn.
4. Pressure controller is not working
correctly.
1. Too much sand, rocks, or debris is
entering auger and causing wear.
2. Auger screw is worn excessively.
1. Auger screw may not be concentric with
tunnel screens and rubbing is occurring
between the flights and screens.
1. Gearbox may require an oil change.
1. Seal housings seals are improperly
installed, or auger screw shaft is worn.
2. Screw press drains are plugged.
POSSIBLE REMEDY
1. Reverse rotation on auger for no more
than 4 turns.
2. Increase temperature.
1. Plug in auger material before starting up.
2. Ice bags can be used as plugging
material.
1. Decrease pressure on screw press doors.
2. Inspect and clean tunnel screens.
3. Inspect and replace taper hubs that lock
auger shaft and screw.
1. See causes and solutions in previous two
sections above.
1. Inspect and clean tunnel screens and
reset overload.
2. Decrease pressure on screw press doors.
3. Replace auger screw.
4. Contact your dealer, Valmetal, or a
qualified electrician.
1. Pre-screen influent to remove solids (e.g.
sand lane).
2. Replace auger screw.
1. Adjust alignment, see page 53 or 58.
1. Refer to Reducer section, page 29 or 30.
1. Replace seals in seal housings and
replace auger screw shaft if needed.
2. Refer to
page 32.
61
CLEANING SCREEN
section,
ScP F442005 2023-03
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