SECTION 3 - CHASSIS & TURNTABLE
3-106
3121171
e.
Fully raise the tower boom. Lower main boom to be
horizontal and fully extended. Position jib and plat-
form to be horizontal and centered. (See Figure 3-70.)
f.
At position indicated in Figure 3-70., try and insert a
0.0015 in (0.038 mm) feeler gauge between bolt
head and hardened washer.
g.
Ensure 0.0015 in (0.038 mm) feeler gauge will not fit
under bolt head to bolt shank as shown in Figure 3-63.
h.
Check a sample of bolts in this 90° quadrant of the
bolt circle (45° left and right of indicated position).
Turntable Bearing Wear Measurement
1.
Position machine as follows and as shown in Figure 3-68.
a.
Rotate turntable 90° so counterweight is over right
side of frame.
b.
Stow tower boom.
c.
Raise main boom to be fully elevated and retracted
d.
Raise jib to be fully elevated and centered
e.
Center platform and keep it unloaded
2.
Set up dial indicator as follows:
a.
Locate dial indicator at rear center of machine, next
to bearing, and opposite counterweight.
b.
Position magnetic base of the indicator on vertical
member of frame as shown in Figure 3-64.
Figure 3-64. Dial Indicator General Location
c.
Position indicator point to measure turntable base
plate (on doubling plate) 3.5 in (88.9 mm) from gear
tooth root as shown in Figure 3-65. and Figure 3-66.
Figure 3-65. Turntable Bearing Measurement Point
Figure 3-66. Dial Indicator Measurement Location
4.
Zero dial indicator.
5.
Position machine as follows and as shown in Figure 3-70.
a.
Do not rotate turntable
b.
Fully elevate tower boom
c.
Lower main boom until horizontal
d.
Fully extend main boom
e.
Lower jib to horizontal
f.
Keep jib and platform centered and unloaded
g.
Verify dial indicator has not shifted. Record bearing
wear value.
3.5 in (88.9 mm)
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