Disassembly/Assembly
Guidelines
IRB 6400
Page 4 - 17
Maintenance
ADJUSTMENTS
Adjusting Axis 4 Gear Play
The following conditions are to exist before play is adjusted:
1. Oil for axis 4 (U83) gearbox is removed.
2. Axis 4 (U83) motor is removed.
3. Axis 4 (U54) gearbox cover is removed.
4. Intermediate gear steel wedges (U78) are placed at even depths with
spring washers (U77) (concave sides facing) and hex nuts just hand
tightened.
5. Intermediate gear hub scres (U67) are just hand tightened.
6. Final gear (U41) and axis 4 tube shaft are mechanically locked from
rotating.
Adjusting Play Between Intermediate Gear (U74)
and Final Gear (U41):
1. Attach magnetic base of dial indicator to machined surface where the axis
4 motor mount to the upper casting.
2. Set dial indicator to read on large diameter intermediate gear (U74) tooth
slot.
3. Shift hub (U72) around until play is between 0.0004-0.001 in.
4. Tighten three screws (U67) to a torque of 52ft-lbs.
5. Tighten hex nuts (U76) to a torque of 9 ft-lbs..
6. Recheck play and re-adjust if necessary.
7. Check a minimum of 4 places around the intermediate gear for high or low
spots.
REFERENCE DRAWINGS
Exploded View:
3HAA 0001-AP (page 13-15)
Assemblies:
“U” (pg 12-4)
3HAA 0001-CS (page 13-14)
3HAA 0001-CS (page 13-17)
REQUIRED TOOLS
Torque Wrench (9-52 ft-lb)
Loctite 242
Dial Indicator
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