PS Magazine - TB 43-PS-581

PS, The Preventative Maintenance Monthly

ISSUE 581

APRIL 2001
PS Magazine - TB 43-PS-581 - Page 15 of 32
I
t’s the domino effect.
One loose nut on an excavator’s
wheel can loosen the other nuts. Then
the wheel begins to wobble, wallowing
out the stud holes and ruining the wheel.
Enough of that and the wheel can break
off.
So eyeball the nuts for tightness
weekly. Look for two things:
shiny
spots on the nut’s washer and corrosion
around the nuts. Have your mechanic
tighten any loose nuts to 255-265 lb-ft.
Once they’re torqued, make your mark so you can quickly check the nuts for
movement. For instance, use a white marker pen or torque seal, NSN 8030-00-408-
1137, and mark a line across the bolt end and nut.
A mark that later doesn’t line up means the nut has moved.
PS 581
APR 01
27
PS 581
APR 01
26
SEE . . .
WHEEL MARKS SAVE DOWNTIME
Paint line
across
stud end
and nut
If marks don’t line
up, nut is loose
581. 26-27(C)
3/12/01
12:20 AM
Page 1
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