JLG E300 Service Manual - Manual (Page 84)

SECTION 3 - CHASSIS & TURNTABLE
3-50 – JLG Lift – 3121253
c. Lower the main boom to horizontal and fully
extend the boom.
d. At the position indicated on Figure 3-24., Swing
Bearing Tolerance Boom Placement try and
insert the.0015” feeler gauge between the bolt
head and hardened washer at the arrow indi-
cated position.
Wear Tolerance
1. With the boom positioned over the side of the
machine, the Upper Boom horizontal with telescope
fully extended and Tower Boom raised half way
(approx 37°)See Figure 3-25., Swing Bearing Toler-
ance Boom Placement, using a magnetic base dial
indicator, measure and record the distance between
the swing bearing and turntable. (See Figure 3-23.,
Swing Bearing Tolerance Measuring Point)
2. At the same point, with the boom positioned over
the side of the machine, the Upper Boom fully
extended and fully retracted, the platform rotated
max. to the side, and the Tower Boom fully elevated,
(See Figure 3-24., Swing Bearing Tolerance Boom
Placement) using a magnetic base dial indicator,
measure and record the distance between the swing
bearing and turntable (Figure 3-23., Swing Bearing
Tolerance Measuring Point).
3. If a difference greater than 0.057 in. (1.40 mm) is
determined, the swing bearing should be replaced.
4. If a difference less than 0.057 in. (1.40 mm) is deter-
mined, and any of the following conditions exist, the
bearing should be removed.
a. Metal particles in the grease.
b. Increased drive power.
c. Noise.
d. Rough rotation.
5. If bearing inspection shows no defects, reassemble
bearing and return to service.
Figure 3-22. Swing Bearing Feeler Gauge Check
Figure 3-23. Swing Bearing Tolerance Measuring Point