14
03
Installation
Manual 4804 Rev E p/n 004804 0000
SOFT FOOT
Soft foot is a condition in which one of the pump
feet does not sit flat on the base. Soft foot is
usually due to irregularities in the surface to which
the pump is mounted. When the bolt on the foot
gets tightened, a slight distortion occurs that
can affect bearing and seal life as well as cause
internal contact between parts.
ANGULAR
SOFT FOOT
PARALLEL
SOFT FOOT
Figure 3-7 – Illustrations of Soft Foot
1. Place the pump on the base.
2. Check each foot for gaps between the foot
and base (soft foot). Shim as necessary to
fill the gap within 0.002 in. (0.05 mm). Figure
3-7 shows the two most common types of soft
foot conditions. If either type is present at a
measurement of more than 0.003 in. (0.076
mm), the pump may fail prematurely.
3. Tighten all bolts.
4. Mount a dial indicator on the base contacting
one foot at 12 o’clock position.
5. Loosen the bolt on that foot. Observe indicator
travel and add shims as needed to reduce
“spring” to less than 0.002 in. (0.05 mm).
Repeat steps 4 and 5 on the remaining feet.
