Foley United 633 Operator's Manual page 33

OPERATION
Pull on the left side PLUNGER PIN and ROTATE THE FINGER AND BODY ASSEMBLY up (counter-clockwise,
looking from the right side) to the relief position until the left side PLUNGER PIN locks into position. NOTE:
The PLUNGER PIN must be fully engaged for proper function.
Replace the 1" wide [ 25mm] grinding wheel with a 3/8" [10 mm] wide relief wheel for relief grinding.
A smaller diameter wheel tends to work better on smaller diameter reels and reels with more blades. A 3.5"
Diameter [89 mm] x 3/8" [10 mm] wide wheel is furnished with the grinder for these smaller reels. As a
general rule, use the largest grinding wheel practical to relief grind. A larger 5" Dia. [127 mm] x 3/8" [10 mm]
wide is also furnished with the grinder and should be used on the larger reels.
NOTE: Check the Proximity Sensor on the Index Finger (right side proximity switch under the spark shield) to
insure that it makes contact (the proximity switch light comes ON) when the index finger catches a reel blade.
THE HIGH POINT OF THE RELIEF FINGER SHOULD ALWAYS BE AT THE CORNER OF THE GRINDING
WHEEL THAT IS MAKING CONTACT WITH THE REEL. ON THIS GRINDER THAT IS ALWAYS THE RIGHT
HAND SIDE OF THE GRINDING WHEEL. SEE FIG. 31.
REEL SPIRAL
Check to see if your cutting unit is a normal or reverse helix.
NORMAL REEL HELIX.
If the wheel has a taper, place the high side of the wheel to the
left side for a normal helix reel. This will allow the wheel to grind
to the end of the blade.
REVERSE REEL HELIX.
If the wheel has a taper, place the high side of the wheel to the
left side for a normal helix reel. Most mowing units are normal
helix.
If you do not use a pre-shaped wheel (so the right side contacts
the last 3/8" [10mm] of the blade) the blade may not be ground
properly.
Adjust the relief guide finger so there is a small gap between the guide
finger and the wheel (about 1/16" [1.5 mm]. See page 35.
STEP 4: RELIEF GRINDING
33
RELIEF GRIND TORQUE
SWITCH
RELIEF GRIND TORQUE
KNOB
ORIGINAL INSTRUCTIONS
FIG. 31