Section 2 - Service and Repair
Setting the Backlash on the Rotational Gear
104045-021 - AB62 Work Platform - European Model
Page 2-21
Figure 2-19:
Jib Cylinder
2-9 S
ETTING
THE
B
ACKLASH
ON
THE
R
OTATIONAL
G
EAR
Backlash is the shortest distance between tooth surfaces of adjacent teeth in mating gears.
Figure 2-20:
Setting Rotational Gear Backlash (Viewed from bottom of turret)
1. Position boom directly over center of
rear axle (standard forward driving
position).
1. Loosen the gearbox mounting bolts just
enough to allow the gearbox to be
adjusted in and out.
2. Turn adjusting screws in until gearbox
teeth make contact with bearing teeth
and adjusting screws become snug.
3. Unscrew adjusting screws five turns.
Do not move the gearbox.
4. Place the magnetic indicator base on the bottom of the turret assembly. Set the dial indicator probe on
the gearbox pinion straight across from the bearing and adjust the dial to ZERO.
5. Move the gearbox away from the bearing until the indicator shows the correct amount of backlash
0,178mm - 0,229mm (.007”-.009”).
6. Carefully torque the gearbox mounting bolts while watching the indicator to make sure the correct back-
lash is maintained.
7. Snug the adjusting bolts against the gearbox and tighten the jamb nuts.
Service Kit includes:
Item
Description
1. O-Ring
2. Rod
Wiper
3. Seal
4. Wear
Ring
5. Back-up
Ring
6. O-Ring
7. Cast
Iron
Ring
8. Wear
Ring
9. Seal
A. Rod
B. Head
C. Piston
D. Nut
E. Cylinder
F. Relief Valve
G. Counterbalance Valve
NOTE: Torque Locknut “D” to 237 - 271 Nm (175-200 ft/lbs)
DIAL INDICATOR
MOUNTING PLATE
GEARBOX PINION
ROTATION BEARING