Wheel Mounting

The wheel guard assembly must be removed in order to mount or dismount a grinding wheel. To do this:

1.Disconnect the grinder from the power supply!

2.Remove the 3 Phillips head screws and nuts that go through the outer guard. Take off the outer guard and the rim guard.

3.Use a wrench on the nut that holds the wheel on the arbor. Hold the wheel from turning with your other hand. Note that the wheel on the left-hand side of the machine is a left- handed thread, so loosening it will require turning it clockwise.

4.Remove the outer wheel flange and the paper disc. Pull the wheel free from the arbor. There will also be a paper disc and a wheel flange on the back side of the wheel.

5.Mount the new wheel in the reverse order or as shown in Figure 3. Always make certain there is a paper or fiber disc between the wheel flanges and the wheel itself. Tighten the nut snugly but DO NOT over-tighten. Over-tightening can crack the wheel.

6.Re-install the guards and shields.

7.Run a new wheel for at least 1-2 minutes while standing clear of the line of rotation. If a wheel does have defects it will generally fail as soon as it gets up to full speed.

Paper/Fiber

Disc

Flange								Flange
					m	inumn
					m	O
				lu		x
				A				i
				M				d
			P	M				e
		R	P					T
0	0							p
0								e
5							1	-
3						i V	1
						i V
						rt
						fi
					ei
				B	d
				dno
Wheel
Paper/Fiber
Disc								Nut

Figure 3. Wheel mounting order.

NEVER assemble a grinding wheel on the arbor without paper or fiber discs between the wheel and the flange. Omitting the discs can put undue stress on the wheel, causing it to crack and possibly fall apart.

ALWAYS visually inspect and perform a “ring test” on a wheel before assembly. DO NOT use damaged wheels!

H4378/H4379 Slimline Bench Grinder

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