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MAINTENANCE MATERIALS
Grease
Use an SAE multi-purpose high temperature grease with extreme pressure (EP) characteristics.
An SAE multi-purpose lithium-based grease is also acceptable. Walinga airlocks are
manufactured using Unirex EP 2 (98-01959-6).
Thread Sealant
Use a high performance thread sealant for fittings, Permatex High Performance Thread Sealant
(92-03141-6).
Lubricant Storage
An airlock can operate at top efficiency only if clean lubricants are used. Use clean containers to
handle all lubricants, be aware of the static buildup/discharge characteristics of the storage
containers. Store lubricants in a container and area protected from dust, moisture and other
contaminants.
ADJUSTMENTS
Pressure-Vent Kit
Venting is not usually required when conveying materials with high bulk-densities such as cereal
grains, however, some materials, such as milled meals or other light materials, may cause
uneven flow or reduced performance due to air blow-back in the inlet area.
To determine if an airlock may benefit from a pressure-vent kit, perform the following test:
1. Operate the conveying system as normal, taking note of any uneven flow and the overall
capacity/performance of the system.
2. Remove the vent plug from the end plate.
3. Operate the conveying system with the plug removed, taking note of any uneven flow
and the overall capacity/performance of the system.
Caution: Both air and excess product may be discharged from the end plate vent during
testing. KEEP CLEAR of the vent during testing.
4. Compare the product flow and overall capacity/performance of the system while the plug
was in place to when the plug was removed. If the flow or performance improved with
the plug removed, install a pressure-vent kit.
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00-144477-0 A
OPERATOR'S MANUAL
MAINTENANCE AND ADJUSTMENTS
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