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Always wear eye protection when operating or
performing maintenance on this tool
Always turn off the air supply and disconnect the air
supply hose before installing, removing or adjusting any
accessory on this tool, or before performing any
maintenance on this tool.
DISASSEMBLY
General Instructions
1. Do not disassemble the tool any further than necessary
to replace or repair damaged parts.
2. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws to
protect the surface of the part and help prevent
distortion. This is particularly true of threaded
members and housings.
3. Do not remove any part which is a press fit in or on a
subassembly unless the removal of that part is
necessary for repairs or replacement.
4. Do not disassemble the tool unless you have a
complete set of new gaskets and O–rings for
replacement.
Disassembly of the Arbor
1. For Models 77H120H63, 77H120H63–EU,
77H90H84, 77H90H84–EU, 77H120H84 and
77H120H84–EU, grasp the Arbor Housing (22) in a
vise, guard up.
2. Use an applicable spanner wrench inserted into the pin
hole of the flange to hold the arbor. Using an
open–end wrench, remove the Wheel Nut (46 or 54).
3. Remove the Wheel Flanges (44 or 53) and Wheel
Flange Pin (36A).
4. Unscrew and remove the Wheel Guard Screws
(47 or 55). Remove the Wheel Guard Lock Washers
(48 or 56), Wheel Guard (43 or 52), and Dust Seal
(36B).
5. Lift the Arbor (35 or 36) and the Arbor Coupling (34)
from the Arbor Housing. Pull the Arbor Coupling off
the Arbor.
6. Grasp the Arbor (35 or 36) in a vise, spline end up.
7. Using pliers, straighten the tangs of the Bearing Lock
Washer (41 or 50). Unscrew the Bearing Locknut
(49 or 57) and remove the Bearing Lock Washer.
8. If the Arbor Bearing (42 or 51) needs to be
replaced, press it from the Arbor Shaft.
9. For Models 77H90L10, 77H90L10–EU, 77H120L10
and 77H120L10–EU, grasp the Arbor Housing (22) in
a vise, cone wheel up.
MAINTENANCE SECTION
10. Using a No. 7RAQT–254 Cone Wheel Arbor Wrench
to hold the arbor, unscrew the cone wheel and remove
it from the arbor.
11. Using a wrench on the flats, remove the Wheel
Bearing Cap (60) in the direction of the arrow on the
face of the Cap. Lift the Wheel Bearing Cap, Arbor
Assembly (37) and Arbor Coupling (34) from the
Arbor Housing. Pull the Arbor Coupling off the Arbor.
12. Grasp the flats on the Arbor (37) in a vise, spline end
up.
13. Using pliers, straighten the tangs of the Bearing Lock
Washer (58). Unscrew the Bearing Locknut (57) and
remove the Bearing Lock Washer.
14. Press the Arbor Bearing (59) from the Arbor Shaft.
15. Remove the Wheel Bearing Cap, Cap Spring (60A)
and Dust Washer (60B).
16. For Model 77H90G6, grasp the Arbor Housing (22)
in a vise, collet end up.
17. Use a No. DG120–69 Collet Arbor Wrench to hold the
Arbor. Using a No. DG120–69 Collet Nut Wrench,
remove the Collet Nut (65).
18. Remove the Collet (66) from the end of the arbor.
19. Using a wrench on the flats, remove the Wheel
Bearing Cap (64) in the direction of the arrow on the
face of the Cap. Remove the Dust Washer (64B) and
Cap Spring (64A).
20. Lift the Arbor (38) and the Arbor Coupling (34) from
the Arbor Housing. Pull the Arbor Coupling from the
Arbor.
21. Grasp the Arbor (38) in a vise, spline end up.
22. Using pliers, straighten the tangs of the Bearing Lock
Washer (62). Unscrew the Bearing Locknut (61) and
remove the Bearing Lock Washer.
23. If the Arbor Bearing (63) needs to be replaced, press it
from the Arbor Shaft.
24. For Models 77H30B106, 77H30B106–EU,
77H50B106 and 77H50B106–EU, grasp the Arbor
Housing (22) in a vise, wire brush up.
25. Use the 7RAQT–254 Wrench on the flats of the Wheel
End Bearing Nut to hold the arbor. Using the
7S60–24818 Wrench, remove the Wire Brush Nut
(78).
26. Remove the Wire Brush Lock Washer (76), Wire
Brush Short Spacer (77A), Wire Brush, Wire Brush
Short Spacer (77A) and Wire Brush Long Spacer (77).
27. Use a wrench on the flats at the end of the arbor to
hold the arbor. Using the 7RAQT4–254 Wrench,
remove the Wheel End Bearing Nut (75).
28. Using a wrench on the flats, remove the Wheel
Bearing Cap (74) in the direction of the arrow on the
face of the Cap. Remove the Dust Washer (74B) and
Cap Spring (74A).
29. Remove the Wheel End Bearing (73).
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