Topic: Installation of New Red Flap O-ring TA824R & TA924R

Models Effected: TA 32 & 42, CB 32 & 42, TA 32R & 42R

Background: Increased loading pressure have resulted in flap o-rings coming out of their grooves. In addition difficulty in achieving a good seal between the flap and the o-ring due to irregularities of the grooves bottom surface. Regular cleaning of the groove can score the metal surface, a new o-ring will follow the contour creating a poor sealing surface at the flap contact area. Leakage of the discharge flap will cause the loader to cycle slowly, or the entry flap to not open at all.

Changes: The new (RED) o-ring material is softer than the black o-rings used previously. Better sealing is achieved as the material conforms to any surface irregularities. All flap o-rings must be glued into their groove with an instant adhesive. This procedure has been in place since 1999. THE RED O-RINGS REQUIRES AN INSTANT ADHESIVE PRIMER BEFORE THE GLUE IS APPLIED.

Materials: TS100 Primer

Procedure: Remove the old o-ring and any glue from the groove. Particular attention must be paid to the bottom surface of the groove to ensure that it is clean and dry before proceeding.

Apply the primer by brush or spray to both the o-ring and the groove. Allow for the primer to dry. Apply a small circular bead of instant adhesive glue to the o-ring. Carefully locate the o-ring on top of the groove cavity, and press it into the groove by hand evenly so as not to cause localized distortion. Visually check for high points, then quickly install a clamping plate over the o-ring and firmly retain for 5-10 minutes. Remove the plate and allow the o-ring material to relax for 5-10 minutes. Install your flap with axle and spacers into the axle groove. Inspect the sealing surface between the flap and the o-ring. This is best accomplished by holding a bright light on one side of the flap and viewing the other side. No light should shine through. If there are high spots then give the o-ring a light sanding with the #400 grit sandpaper, and re-check with the light. This perfect seal is most important on the discharge flap, as any leakage will allow a constant flow of air into the chamber between the flaps. Thus the entry flap will be slow to open or not at all.