Disassembly of the Bevel Pinion Driver

MAINTENANCE SECTION

A thread locking compound was applied to the threads of the Rotor during assembly to prevent the Controller Assembly (22) from loosening during operation. Before attempting to unscrew the assembly from the Rotor, apply moderate heat from a propane torch to the middle of the rotor body to soften the compound. Do not overheat the Rotor. Heat it only long enough to allow the Controller Assembly to be unscrewed without using excessive force.

Use only the special Controller Wrench for removing the Controller Assembly. Do not attempt to disassemble the Controller. It is available only as a unit and is guaranteed for the life of the Grinder if it is not abused.

11.Using the No. 77H–950 Controller Wrench, unscrew and remove the Controller Assembly (22).

The Rear End Plate, Spacer and Bearing are a matched set. Do not mix the components with those of another set. The Rear Rotor Bearing is always damaged during the removal process, and a complete new Rear End Plate Assembly must be installed.

12.If the Rear End Plate Assembly (23) consisting of the Rear End Plate, Spacer and Bearing needs to be replaced, press it from the Controller.

13.Remove the Rear End Plate Gasket (24).

14.Using No. 77H–154 Retainer Pliers, remove the Throttle Valve Seat Support Retainer (15).

15.Grasp the Throttle Handle horizontally in leather–covered or copper–covered vise jaws. Using a brass rod 8” (204 mm) long inserted into the air inlet end of the handle, lightly tap the brass rod with a soft hammer to release the Throttle Valve Seat Support Assembly (8).

16.Remove the Valve Seat Screw (9), Valve Seat Lock Washer (10), Valve Seat Washer (11), Valve Seat (12) and Valve Support Seals (13).

17.Check the Oiler Feeder Plug (14). Replace if necessary.

For GRP15A–02P–7 Models:

1.Lightly tap the Angle Arbor Housing (43) to release the Bevel Pinion Driver (31).

2.Remove the Internal Gear (32).

3.Remove the Bevel Pinion Driver Bearing (33). This is a light press fit.

4.Check the Planet Gears (36) and Planet Gear Bearings (37) for wear. If they need to be replaced, proceed as follows:

Always remove the Planet Gear Shafts (34) in the direction shown on the drawing.

a.Using a pin punch and soft hammer, remove the Planet Gear Shaft.

b.Remove the Planet Gear Assembly.

c.Remove the Planet Gear Bearing from inside the Planet Gear.

d.Remove the Rotor Pinion (35).

Always replace both Planet Gears even if only one Planet Gear shows wear.

e.Remove the second Planet Gear as previously instructed.

5.Unscrew and remove the Pinion (40).

If the Pinion is worn or broken, replace both the Pinion and Bevel Gear as they are a matched set and cannot be matched with other Bevel Gears.

6.Press the Bevel Pinion Bearing (39) from the Bevel Pinion Driver.

7.Remove the Thrust Spacer (38).

For GRG15A, GRG15M or GRS15A Models:

1.Lightly tap the Angle Arbor Housing (43) to remove the Motor Spacer (41), Arbor Coupling (42), Thrust Spacer (38), Bevel Pinion Bearing Assembly (39), and the Bevel Pinion Driver (31).

2.Unscrew and remove the Bevel Pinion (40).

If the Pinion is worn or broken, replace both the Pinion and the Bevel Gear as they are a matched set and cannot be matched with other Bevel Gears.

3.Press the Bevel Pinion Bearing (39) from the Bevel Pinion Driver.

ASSEMBLY

General Instructions

1.Always press on the inner ring of a ball–type bearing hen installing the bearing on a shaft.

2.Always press on the outer ring of a ball–type bearing when pressing the bearing into a bearing recess.

3.Whenever grasping a tool or part in a vise, always use leather–covered or copper–covered vise jaws.

Take extra care with threaded parts and housings.