General Instructions

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 a GRG Grinder, GRS Sander, or GRP Polisher is disassembled for maintenance, repair or replacement of parts, lubricate the tool as follows:

1.Moisten all O–rings with O–ring lubricant.

2.Coat the inner surface of the Arbor Coupling (42), the spline of the Rotor (26) and the spline of the Bevel Pinion (31) with 3 to 4 cc of IRAX No. 68–1LB Grease. Do not substitute any other grease.

3.After assembling the tool, remove the Oil Chamber Plug (7) and fill the oil chamber with IRAX

No. 50P Oil. Tighten the Plug to 3–3/4 to 7–1/2 ft–lb (5 to 10 Nm) torque. Inject 2.5 cc of the recommended oil into the inlet before installing the Inlet Bushing (4).

4.Inject 5 cc of IRAX No. 68–1LB Grease into both Grease Fittings (44).

DISASSEMBLY

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 Angle Head

For GRG15A or GRG15M Models:

1.Grasp the Angle Arbor Housing (43) in leather–covered or copper–covered vise jaws, angle head up.

2.Insert a 5” (127 mm) long 3/16” hex wrench into the elongated slot in the end of the Dead Handle (70) and loosen and remove the screw and the Dead Handle from the Angle Arbor Housing (43).

3.Using the Autobalancer Wrench (Part No. 88V60–169) to hold the Depressed Center Wheel Arbor (60) against rotation, proceed as follows:

a.Using a hex wrench, unscew and remove the Wheel Retaining Screw (65).

b.For Type 27 and 28 Plain Hole Wheels, use the Depressed Center Wheel Nut Spanner Wrench (Part No. D32–26) to unscrew and remove the Depressed Center Wheel Nut (67). Remove the wheel.

For Type 27 and 28 Mounted Wheels, unscrew the wheel.

c.For Type 27 and 28 Plain Hole Wheels, unscrew and remove the Depressed Center Wheel Flange (66 or 68).

For Type 27 and 28 Mounted Wheels, remove any Depressed Center Wheel Spacers (63).

4.Slide the Autobalancer Assembly (61) off the Arbor.

5.Unscrew and remove the Wheel Guard Screws (54). Remove the Screw Lock Washers (53) and the Wheel Guard (59).

6.Lift the Depressed Center Wheel Arbor (60) from the Angle Arbor Housing.

Do not remove the Mounting Plate Pin (45) unless it is bent or broken. The Mounting Plate Pin is the alignment pin for the Wheel Guard and must be used to assure correct mounting of the Wheel Guard. Use pliers to remove the Mounting Plate Pin if removal is necessary and a new Pin is available.

7.Remove the Angle Arbor Housing from the vise.

8.Lay the Angle Arbor Housing on a workbench, guard side down. Lightly tap the angle arbor housing head with a soft hammer to release the Upper Arbor Bearing (47) and Upper Bearing Spring Washer (46).