16
MAINTENANCE SECTION
Always wear eye protection when operating or
performing maintenance on this tool.
Always turn off air supply and disconnect air supply
hose before installing, removing or adjusting any
accessory on this tool, or before performing any
maintenance on this tool.
LUBRICATION
Each time the Series 61H Grinder is disassembled for
maintenance, repair or replacement of parts, lubricate the
tool as follows:
1. Apply a coating of Ingersoll–Rand No. 68 Grease to
the inner surface of the Arbor Coupling (39).
2. Fill the oil reservoir in the handle with
Ingersoll–Rand No. 50 Oil. Inject approximately
2.5 cc of oil into the air inlet before attaching the air
hose. Remove the Oil Chamber Plug (3) and fill the
oil chamber.
3. When installing a new Seal Cup Assembly (28, 38,
or 42) or a new Dust Washer (45), impregnate the new
seal or washer with Ingersoll–Rand No. 50 Oil before
installation.
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 Tool
1. Clamp the handle of the Grinder horizontally in
leather–covered or copper–covered vise jaws.
2. For Models 61H120H63, 61H120H64 and
61H150H63, proceed as follows:
a. Insert a sprag pin into one of the radial holes in
the Inner Wheel Flange (48) and using a wrench,
remove the Wheel Flange Nut (52).
b. Remove the Outer Wheel Flange (51) and the
grinding wheel.
c. Using snap ring pliers, remove the Inner Wheel
Flange Retainer (50) and slide the Inner Wheel
Flange off the Arbor (41) being careful not to lose
the Inner Wheel Flange Key (49).
For Models 61H120G4 and 61H150G4, using a
wrench on the flats of the Collet Body (54) and
the flats on the Collet Nut (56), unscrew the Collet
Nut and remove the Collet (55).
For Models 61H120L6 and 61H150L6, unscrew
and remove the cone wheel.
The Wheel Guard (47) has left–hand threads.
3. For Models 61H120H63, 61H120H64 and
61H150H63, using a wrench on the hub of the Wheel
Guard, unscrew and remove the Wheel Guard and
Bearing Clamp Washer (44).
The Wheel End Bearing Cap (46) has left–hand
threads.
For all other models, using a wrench, unscrew and
remove the Wheel End Bearing Cap and Bearing
Clamp Washer (44).
4. Grasping the Arbor (41), Collet Body (54) or Cone
Wheel Adapter (53), pull the assembled Arbor from
the Arbor Housing (33).
5. For Models 61H120G4 and 61H150G4, using one
wrench on the flats of the Collet Body and another on
the flats of the Arbor, unscrew and remove the Collet
Body.
For Models 61H120L6 and 61H150L6, using one
wrench on the flats of the Cone Wheel Adapter and
another on the flats of the Arbor, unscrew and remove
the Cone Wheel Adapter.
6. If the Dust Washer (45) must be replaced, use a
pointed probe to pick the Washer out of the Wheel
End Bearing Cap or Wheel Guard.
7. Slide the Wheel End Bearing (43) off the Arbor and
pull the Seal Cup Assembly (42) off the Arbor if it
needs replacement.
8. Using a wrench on the flats of the Arbor and another
on the flats of the Bearing Nut Assembly (31),
unscrew and remove the Bearing Nut Assembly.
9. If the Seal Cup Assembly (38) requires replacement,
pull it off the Bearing Nut Assembly.
10. Slide the Rear Arbor Bearing (40) off the Arbor.
11. If the Arbor Coupling (39) remained in the Arbor
Housing when the Arbor was removed, strike the
castellated end of the Housing against a block of
wood to free the Coupling.
