Maintenance/Service

1)Position the SURFACE GRINDER on a suitable work surface with the V-belts approximately at waist level.

2)Remove the rubber latches and slide the belt guard away from the engine/electric motor until it clears the catch mechanism. Remove the belt guard from the main frame. Clean the inside of the belt guard with an appropriate solvent.

Check for signs of wear and damage. Secure in a proper storage area.

CAUTION

Observe all applicable safety precautions for the solvent.

3)Using the 1/2-inch wrenches, loosen the engine/motor mounting plate cap screws.

4)With the same wrenches, rotate the engine take- up cap screws counterclockwise to loosen the V- belts and allow the engine/electric motor to slide toward the front of the main frame. FIGURE 43.

FIGURE 43

5)Remove the worn V-belts. Inspect the engine/electric motor and transmission pulleys for wear and damage. Install the replacement belts, P/N 29018-012 in pairs. The SURFACE GRINDER utilizes two V-belts. Always install replacement belts in matched pairs. Never replace just one of the V-belts.

CAUTION

Do not operate the SURFACE GRINDER with only one V-belt installed. One V-belt is not capable of transmitting proper horsepower and torque levels to the multi-accessory discs.

a)Do not install replacement belts if the pulleys have excessively worn grooves. Such pulleys should be replaced to insure proper belt fit. Operating the V-belts in worn pulley grooves will accelerate wear, reduce horsepower and torque levels and significantly reduce component service life.

b)A V-belt should never be forced over a pulley. More belts are broken from this cause than from actual failure in service.

c)Keep the belts as clean and free of foreign material as possible. Do not use belt dressing

6)The centrifugal clutch assembly utilized on both the gasoline engine powered and Propane converted SURFACE GRINDERs is designed to deliver an extended service while requiring minimal service. However, long term use of the SURFACE GRINDER can allow the accumulation of fine dusts and powders within the clutch assembly. These dusts and powders can dramatically reduce the capacity of the the

clutch drum bearing, resulting in the following operational characteristics:

a)When operating the engine at idle speed, the centrifugal clutch assembly will not fully disengage, allowing the multi accessory discs to rotate at low speed.

b)When the engine is advanced to and/or from the idle speed position, erratic machine movement or "grinding" and "thrashing" noises from the clutch area are detected.

In many cases, clutch assembly removal, a cleaning of the bearing surfaces and reassembly will solve the problem.

7)Rotate the take-up cap screws clockwise until the V-belts have enough tension to not allow them to fall off the centrifugal clutch and/or pulleys.

8)Using the 9/16-inch wrench, remove the retaining cap screw from the engine crankshaft. Using the 5/32 inch allen wrench, loosen the two set screws located near the snap ring. The clutch can now be removed from the engine crankshaft. FIGURE 44.

9)The centrifugal clutch is comprised of a rotor/shoe assembly, a drum/pulley assembly, a thrust washer and retaining snap ring.

a)Using the snap ring pliers, remove the snap ring from the clutch assembly. FIGURE 45.

DFG-SERIES SURFACE GRINDERS	OPERATION AND PARTS MANUAL REV #3 (07/13/06)	PAGE 42