Cracked Concrete HeadAlways inspect materials when received from supplier. Do not install a head that has a structural crack or fissure running internally into it. Slight flaking or chipping does not constitute a crack.
Concrete Flaking During installation, pins rubbing against the concrete head may cause superficial flaking of concrete around the driving hole. This will not affect the structural strength. However, if a structural crack or fissure running internally into the concrete head develops during installation, the integrity of the pier has been compromised and the concrete head must be removed and replaced.
Concrete Head Will Not Stay Level When InstallingOne or more pins may be driving out of line due to obstructions in the soil (See “Encountering Obstructions,” page 13), or your hole for setting the concrete head may be too big. Only dig a hole the size of the head being used, and be sure to put all pins in the head before setting them. With all the pins sticking up from the head, one person can also push or pull on the pins to manipulate the leveling process and guide or steer the concrete head to a level position, being careful not to wrench on it and cause a crack.
Concrete Head Installed Out of LevelIf a concrete head is more than 5 degrees out of level, the symmetry of the bearing pins may be compromised—the head should be removed and repositioned. Reinstall the pins incrementally at first, checking level constantly, and if one pin is not going in straight and is causing the head to tip, install the other pins first and then carefully finish driving this last pin.
Hitting an Obstruction When InstallingIf an obstruction is encountered, the pins may be removed and the concrete head repositioned. If the obstruction is dug out and removed, soil must be recompacted per the Installation Instructions. See “Encountering Obstructions”.
Installing in Frozen GroundCheck with the local building code for criteria or limitations on installing foundations in frozen soil. See “Frost Heave” and “Heave Resistance”.
Pins Have Risen Slightly Out of the Concrete HeadThis may occur when extreme loads have been applied to the pier, but the foundation is designed to relieve pressure in this way. The pins may simply be tapped back to their original position with a small hammer. Remove the caps, tap the pin, and replace the caps.
Pins Will Not Fit into Concrete HeadMake sure the pins fit into the concrete head before inserting the inspection plugs. Be sure pins and concrete heads are free of dirt, and check both ends of pins for fit. Always transport and store parts in a clean environment. Measure the pin diameter to be sure the proper pins have been supplied for your pier model. (The DP-50 model has a 1" nominal pin with a 1.315" actual outside diameter [OD]; DP-75 has a 1-1/4" nominal pin with a 1.67" actual OD.) If the pins still do not fit, contact your supplier.
Pin Caps Will Not Fit over Driven PinsCheck to be sure the proper cap size was supplied and that your caps are pliable and not frozen. Caps should be tapped on with a small hammer. If they still will not go on, check the pin ends for any extreme deformations that may have occurred while driving. File or grind off any damage to re-establish the original diameter, and apply the cap.

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