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Operating Problem
4.2.2 Prolonged Operation in
Reverse Direction
4.2.3 Tip/Casing Clearances too
Tight
4.2.4 Drive-line adjusted
Incorrectly
4.2.5 Faulty Drive Motor
4.3 Air Blow-Back
Restricts Feed Inlet
4.3.1 Blade Tips and Casing
4.3.2 Airlock Casing not
Pressure-vented
Note: Venting is not usually
needed in free-flowing materials
with high bulk densities eg cereal
grain.
4.4 Airlock Tip Or Flexible
Tip Wiper Breaks (if
applicable)
4.4.1 Prolonged Operation in
Reverse Direction of Rotation
4.4.2 Tip Wiper Fouling on
Blade Tips
Possible Cause & Recommended Action
The Walinga airlock operates in an counter-clockwise direction
when viewed from driven end. Damage to rotor blades and tips
due to prolonged operation in the opposite direction may cause
jamming. The unit may need to be removed to assess rotor and
casing damage - repair or replace.
Re-set clearances between blade tips and casing as
described in maintenance section.
If fitted with chain/sprocket drive check tension,
alignment and flexibility of links.
Service drive motor.
Remove airlock and adjust tips to correct clearance as
described in maintenance section.
Excessive clearance causes operating problems including
bridging and erratic flow. Prolonged operation with high
clearances wears the casing unevenly - this will result in lower
performance even after adjustment of tips.
Quick test while operating
a) Loosen vent plug in end plate - item on diagram.
(b) Operate airlock to transfer feed -first with plug in end plate
and then removed.
(c) Check whether flow improves with plug removed. If flow
improves fit a pressure-vent kit.
Custom-designed vented hoppers may be used for fine
materials like milled meals.
CAUTION; Both air AND excess feed may blowout of vent
hole during test. KEEP YOUR FACE WELL CLEAR OF
VENT HOLE.
Airlock must operate in counter-clockwise direction when
viewed from driven end. Change direction and service tips or
flexible tip wiper if necessary.(only applicable if tip wiper is
used)
Re-adjust clearance of flexible tip wiper - see Maintenance
Section 5
8
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