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4 — MAINTENANCE
4-17
4-5 SLEW RING BEARING
Check Free Play
Check the free play of the slew ring bearing every six months. If the recommended main-
tenance schedule is followed, there should be little or no wear of the slew ring bearing.
Check the slew ring bearing free play according to the following procedure:
1. Fully retract (lower) the lift booms.
2. Go to the hydraulic reservoir side of the boom lift. Open the power cabinet.
3. Access the top surface of the slew ring gear near the front end (trailer tow end)
of the gear. This area is below and behind the hydraulic pump reservoir.
4. Insert a 2-inch (50 mm) caliper or bore micrometer at the top front surface of the
slew ring gear.
5. Measure the distance from the top of the slew ring gear to the horizontal plate
above the gear (Figure 4-11). Record the measurement.
6. Place a 175 lb (80 kg) load in the boom lift basket.
7. Raise the lower boom until the front of the boom is about 11.5 ft (3,5 m) from
the ground.
8. Slowly raise the upper boom and extend the jib boom until both are horizontal.
9. Repeat the measurement in step 5. Record the measurement.
10. If the difference between the measurements in step 5 and step 9 is greater than
0.25 inch (6,35 mm) the slew ring bearing should be replaced. Notify Bil-Jax for
bearing replacement instructions or assistance.
MEASURE
HERE
TOW E
OF TRA
SLEW
RING
ND
ILER
Figure 4-11. Slew Ring Position Measurement