Graco GrindLazer 270 Operating instructions

3A0102D
Repair
GrindLazer™
- Designed to grind flat, horizontal concrete or asphalt surfaces -
- For removal of materials from concrete and asphalt surfaces -
- Professional outdoor use only -
Model 571002 - Forward cut
GrindLazer 270 (270 cc / 9 hp)
Model 571003 - Forward cut
GrindLazer 390 (390 cc / 13 hp)
+
Model 571004 - Reverse up-cut (Must be used with LineDriver™)
GrindLazer 480 (480 cc / 16 hp)
Model 571260 - Reverse up-cut (Must be used with LineDriver™)
GrindLazer 630 (627 cc / 21 hp)
IMPORTANT SAFETY INSTRUCTIONS
Read all warnings and instructions in this
manual. Save these instructions.
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GrindLazer 270 and 390 GrindLazer 630
(Drums, cutters, and LineDriver™sold separately)
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Related Manuals:
Operation - 3A0101
Parts - 3A0103
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EN

Table of Contents
23A0102D
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Component Identification . . . . . . . . . . . . . . . . . . . . 5
Drum Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 6
Cutter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 7
Belt Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Clutch Replacement . . . . . . . . . . . . . . . . . . . . . . . 11
Pulley Replacement . . . . . . . . . . . . . . . . . . . . . . . . 12
Brush Replacement . . . . . . . . . . . . . . . . . . . . . . . . 13
Drive Bearing Assembly Replacement . . . . . . . . 14
Door Bearing Assembly Removal . . . . . . . . . . . 14
Door Bearing Assembly Installation . . . . . . . . . 14
Drive Bearing Assembly Removal . . . . . . . . . . 15
Drive Bearing Assembly Installation . . . . . . . . . 16
Sheave Installation . . . . . . . . . . . . . . . . . . . . . . 16
Cutter Stacking Recommendations . . . . . . . . . . . 17
6 in. (15 cm) Coarse Cut Flail Cutters (Double
Space)
276 Spacers / 60 Cutters . . . . . . . . . . . . . . 17
8 in. (20 cm) Coarse Cut Flail Cutters (Double
Space)
234 Spacers / 84 Cutters . . . . . . . . . . . . . . 18
10 in. (25 cm) Coarse Cut Flail Cutters (Double
Space)
210 Spacers / 102 Cutters . . . . . . . . . . . . . 19
6 in. (15 cm) General Cut Flail Cutters (Single
Space)
234 Spacers / 84 Cutters . . . . . . . . . . . . . . 20
8 in. (20 cm) General Cut Flail Cutters (Single
Space)
186 Spacers / 114 Cutters . . . . . . . . . . . . . 21
10 in. (25 cm) General Cut Flail Cutters (Single
Space)
150 Spacers / 138 Cutters . . . . . . . . . . . . . 22
6 in. (15 cm) Fine Cut Flail Cutters
198 Spacers / 108 Cutters . . . . . . . . . . . . . 23
8 in. (20 cm) Fine Cut Flail Cutters
138 Spacers / 144 Cutters . . . . . . . . . . . . . 24
10 in. (25 cm) Fine Cut Flail Cutters
90 Spacers / 174 Cutters . . . . . . . . . . . . . . 25
6 in. (15 cm) Cut Carbide Millers
204 Spacers / 30 Cutters . . . . . . . . . . . . . . 26
8 in. (20 cm) Cut Carbide Millers
132 Spacers / 42 Cutters . . . . . . . . . . . . . . 27
10 in. (25 cm) Cut Carbide Millers
66 Spacers / 54 Cutters . . . . . . . . . . . . . . . 28
6 in. (15 cm) Full Cut Flail Setup
258 Spacers / 84 Cutters . . . . . . . . . . . . . . 29
8 in. (20 cm) Full Cut Flail Setup
210 Spacers / 108 Cutters . . . . . . . . . . . . . 30
10 in. (25 cm) Full Cut Flail Setup
162 Spacers / 138 Cutters . . . . . . . . . . . . . 31
6 in. (15 cm) Steel Cutters Setup
222 Washers / 126 Cutters . . . . . . . . . . . . . 32
8 in. (20 cm) Steel Cutters Setup
156 Washers / 174 Cutters . . . . . . . . . . . . . 33
10 in. (25 cm) Steel Cutters Setup
114 Washers / 204 Cutters . . . . . . . . . . . . . 34
Diamond Blades . . . . . . . . . . . . . . . . . . . . . . . . 35
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 39

Warnings
3A0102D 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risk.
Refer back to these warnings. Additional, product-specific warnings may be found throughout the body of this manual
where applicable.
WARNING
DUST AND DEBRIS HAZARD
Use of this equipment to grind concrete and other paving materials can result in the release of potentially
harmful dust or chemicals from the materials.
• For use only by sophisticated users familiar with applicable governmental safety and industrial
hygiene regulations.
• Use equipment only in a well-ventilated area.
• Wear a properly fit-tested and government approved respirator suitable for the dust conditions.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not leave the work area while equipment is energized. Turn off all equipment when equipment is
not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manu-
facturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
• Maintain a safe operating distance from other people in the work area.
• Avoid any pipes, columns, openings, or any other objects protruding from work surface.
MOVING VEHICLE HAZARD
Careless and reckless behavior causes accidents. Falling from vehicle, running into people or object, or
being struck by other vehicles may result in serious injury or death.
• Do not step on forward/reverse pedals.
• Make turns slowly. Do not make turns greater than 45°.
• Loss of traction may occur going downhill. Do not operate on slopes greater than 15°.
• Do not carry passengers.
• Do not tow.
• Use with line striping equipment only.
• Use appropriate traffic control in all traffic areas. Refer to Manual on Uniform Traffic Control Devices
(MUTCD), U.S. Department of Transportation, Federal Highway Administration or local highway and
transportation regulations.
MOVING PARTS HAZARD
Moving parts can pinch or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Before checking, moving, or servicing equipment, disable power supply.
BURN HAZARD
Equipment surfaces that are heated can become very hot during operation. To avoid severe burns, do
not touch hot equipment. Wait until equipment has cooled completely.

Warnings
43A0102D
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
• Use equipment only in well ventilated area.
• Do not fill fuel tank while engine is running or hot; shut off engine and let it cool. Fuel is flammable
and can ignite or explode if spilled on hot surface.
• Keep work area free of debris, including solvent, rags and gasoline.
• Keep a fire extinguisher in work area.
CARBON MONOXIDE HAZARD
Exhaust contains poisonous carbon monoxide, which is colorless and odorless. Breathing carbon
monoxide can cause death. Do not operate in an enclosed area.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of dust or
chemicals, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Protective shoes
• Gloves
• Hearing protection
• Properly fit-tested and government approved respirator suitable for the dust conditions
CALIFORNIA PROPOSITION 65
The engine exhaust from this product contains a chemical known to the State of California to cause
cancer, birth defects or other reproductive harm.
This product contains a chemical known to the State of California to cause cancer, birth defects or other
reproductive harm. Wash hands after handling.
WARNING

Component Identification
3A0102D 5
Component Identification
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G
E
C
B
A
F
D
H
K
C
B
A
270 and 390 Models
480/630 Models
M
N
D
Component Description
A Engine Throttle Lever Adjusts engine speed.
B Engine Stop Switch Supplies power to Engine
C Emergency Shut-Off Clamps onto the operator and shuts engine off if cord is disconnected during
operation.
D Drum Adjustment Dial Raises and lowers cutting drum.
E Drum Engage Lever When lever is engaged, handle bars can be pushed down to raise the cutting
drum off of surface and locked into UP position. Once drum is locked in UP
position, GrindLazer can be moved around without drum touching surface.
F Front Wheel Lock Lever Front wheel is usually locked to guide GrindLazer in a straight line. When lever
is engaged, front wheel becomes unlocked and is allowed to turn freely.
G Rear Wheel Parking Brake Prevents rear wheel from moving.
H Drum Access Panel Removable plate that allows access to replace cutting drum.
K Depth Control Wheels Sets depth of drum cut
M Vacuum Port Port to attach vacuum to reduce dust and debris during operation.
N Lift Points Reinforced points used for lifting GrindLazer during transportation or repair.

Drum Replacement
63A0102D
Drum Replacement
Removal
1. Remove four bolts and Drum Access Panel (H).
2. Slide drum off of hex shaft.
Installation
NOTE: Carbide Flail Cutter drums do not require
specific orientation or direction. Carbide Millers and
Diamond Blades are directional. They should be
stacked so that the arrows on the Millers and Blades
face the same direction as the rotation of the drum.
270 and 390 models are designed for “forward cut”
grinding (the drum rotates in the same direction that it
travels). 480 and 630 models are design for “reverse (up
cut)” grinding (the drum rotates in the opposite direction
that it travels).
1. Slide replacement drum onto hex shaft.
2. Lower Drum Adjustment Dial (D) and pull Drum
Engage Lever (E) so drum rests on ground.
3. Replace Drum Access Panel (H) and tighten four
bolts to 27-30 ft-lb (37-41 N•m).
Avoid touching or handling drum after use until it has
completely cooled.
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Carbide Miller Diamond Blade
Forward Cut (270/390 Models) Reverse (up cut) 480/630 Models
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Cutter Replacement
3A0102D 7
Cutter Replacement
Removal (Carbide Flail/Carbide Miller)
1. Remove drum (see Drum Replacement, page 6).
2. Loosen six bolts on each side of drum (do not
remove bolts).
3. Rotate plates on each side of drum so rods are
exposed.
4. Push rod out and remove cutters.
Installation (Carbide Flail/Carbide Miller)
1. Replace cutters and washers (see Cutter Stacking
Recommendations, pages 17 - 35).
NOTE: Cutters must be centered on drum for best
performance.
2. Rotate plates on each side of drum to cover rods.
3. Tighten six bolts on each side of drum to 125-175
in-lb (14-20 N•m).
4. Install drum (see Drum Replacement, page 6).
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Cutter Replacement
83A0102D
Removal (Diamond Blades)
1. Remove drum (see Drum Replacement, page 6).
2. Place drum in vise.
3. Use spanner wrench to loosen spanner nut
(turn clockwise) and remove.
NOTE: This nut has a left-hand thread.
4. Remove all spacers and diamond blades.
Installation (Diamond Blades)
1. Replace all spacers and diamond blades in the
sequence and orientation shown below (blades
should be rotated in alternating segments when
stacking).
NOTE: Blades must be centered on drum for best
performance.
2. Use spanner wrench to tighten spanner nut
(turn counter-clockwise).
3. Remove drum from vise and install drum (see Drum
Replacement, page 6).
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Belt Replacement
3A0102D 9
Belt Replacement
Removal
1. Remove three nuts and washers. Remove belt
shroud.
2. Loosen jam nut through two sides of belt.
3. Use two wrenches to loosen motor mount bolts on
each side of scarifier base.
4. Tighten bottom bolt to lower pulley plate.
5. Remove used belt.
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Belt Replacement
10 3A0102D
Installation
1. Install new belt.
2. Use two wrenches to tighten motor mount adjust-
ment bolts on each side of scarifier base.
3. Tighten belt adjustment bolt according to recom-
mended tension below.
Belt Tension Recommendations:
4. Tighten jam nut through two sides of belt.
5. Replace belt shroud and tighten three nuts and four
screws.
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(3VX375 Belt)
Model Series
270
A
390
A
480
A
630
A
New
Belt
Tension (Lbf) 130 +/- 5 174 +/- 6 204 +/- 7
Frequency (Hz) 83 +/- 2 96 +/- 2 104 +/- 2
Used
Belt
Tension (Lbf) 112 +/- 5 150 +/- 6 176 +/- 7
Frequency (Hz) 77 +/- 2 90 +/- 2 97 +/- 2
(3VX355 Belt)
Model Series
270
B, C, D
390
B, C, D
480
B, C, D
630
A
New
Belt
Tension (Lbf) 145 +/- 5 193 +/- 7 194 +/- 7 194 +/- 7
Frequency (Hz) 91 +/- 2 105 +/- 2 105 +/- 2 105 +/- 2
Used
Belt
Tension (Lbf) 125 +/- 5 167 +/- 7 167 +/- 7 167 +/- 7
Frequency (Hz) 85 +/- 2 98 +/- 2 98 +/- 2 98 +/- 2
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Clutch Replacement
3A0102D 11
Clutch Replacement
Removal
1. Remove belt guard and belt (see Belt Replace-
ment, page 9).
2. Use impact wrench to remove clutch bolt.
3. Remove used clutch.
Installation
1. Install clutch.
2. Use impact wrench to tighten clutch bolt.
3. Install belt and belt guard (see Belt Replacement,
page 9).
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Pulley Replacement
12 3A0102D
Pulley Replacement
Removal
1. Remove drum (see Drum Replacement, page 6).
2. Remove belt guard and belt (see Belt Replace-
ment, page 9).
3. Remove three belt pulley screws and washers.
4. Insert three screws into pulley removal holes.
Evenly tighten screws and slowly remove pulley.
5. Remove pulley.
Installation
6. Install pulley onto hex shaft.
7. Insert three pulley screws and washers.
8. Replace belt guard and belt (see Belt Replace-
ment, page 9).
9. Replace drum (see Drum Replacement, page 6).
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Brush Replacement
3A0102D 13
Brush Replacement
Removal
1. Remove two mounting bolts.
2. Remove used brush.
Installation
1. Install new brush.
2. Tighten two mounting bolts.
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Drive Bearing Assembly Replacement
14 3A0102D
Drive Bearing Assembly Replacement
Door Bearing Assembly
Removal
1. Remove four nuts holding bearing assembly onto
door and remove door.
Door Bearing Assembly
Installation
1. Insert new door bearing assembly through hole in
door. NOTE: Make sure shaft seal is on the inside of
the cage.
2. Install dust cover onto bearing. Hand-tighten nuts
and lock washers to the door. NOTE: Do NOT fully
tighten bolts at this time.
3. Assemble door onto unit and slide door around until
the bearing assembly settles into position for proper
alignment.
4. Tighten four nuts on bearing assembly to secure it
into place.
5. Tighten four bolts to hold door in place.
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Drive Bearing Assembly Replacement
3A0102D 15
Drive Bearing Assembly
Removal
1. Remove door from unit and remove any cutting
drum on machine.
2. Remove belt guard and belt (see page 9).
3. Remove sheave.
a. Remove three bolts holding sheave onto
bushing.
b. Insert three bolts into adjacent holes and evenly
tighten to remove sheave from bushing.
c. Remove sheave.
d. Remove set screw from bushing.
e. Remove bushing from drive shaft. If bushing is
very tight, tap a flat-head screwdriver into slot
on bushing to open it up and slide off shaft.
NOTICE
Do NOT over torque an individual bolt or it will break.
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Drive Bearing Assembly Replacement
16 3A0102D
4. Remove all four nuts holding drive side bearing onto
cage.
5. Slide shaft assembly out of holes.
Drive Bearing Assembly
Installation
1. Insert new drive bearing assembly into cage.
NOTE: Be sure to use the shorter bolts for the drive
side bearing.
2. Tighten nuts and lock washers to hold bearing
assembly in place.
3. Make sure drive shaft key is assembled as shown
below.
Sheave Installation
1. Insert bushing onto drive shaft. Make sure key is in
place.
2. Apply thread sealant to set screw and install set
screw into bushing.
3. Apply thread sealant to bolt and place lock washer
and spacer onto bolt as shown. Thread it into the
end of the shaft and tighten. Make sure lock washer
is fully compressed.
4. Install sheave onto bushing and evenly tighten three
bolts and lock washers to pull the sheave onto the
building.
5. Replace belt and belt guard (see page 9).
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Cutter Stacking Recommendations
3A0102D 17
Cutter Stacking Recommendations
6 in. (15 cm) Coarse Cut Flail Cutters (Double Space)
276 Spacers / 60 Cutters
INSTRUCTIONS: Rotate sequence 180° and repeat for
remaining shafts.
(S) Spacer (C) Carbide Cutter
13 (S)
1 (C)
2 (S)
3 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
15 (S)
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15 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
2 (S)
2 (S)
2 (S)
1 (S)
1 (S)
3 (S)
2 (S)
2 (S)
2 (S)
1 (C)
1 (C)
1 (C)
1 (C)
13 (S)
1 (S)
NOTE: Assembly may vary due to tolerances.
Stack cutters and spacers so the drum is properly
balanced to prevent excessive vibration.

Cutter Stacking Recommendations
18 3A0102D
8 in. (20 cm) Coarse Cut Flail Cutters (Double Space)
234 Spacers / 84 Cutters
INSTRUCTIONS: Rotate sequence 180° and repeat for
remaining shafts.
2 (S)
2 (S)
1 (C)
(S) Spacer (C) Carbide Cutter
5 (S)
1 (C)
3 (S)
2 (S)
1 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
14 (S)
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1 (C)
8 (S)
1 (C)
2 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
2 (S)
2 (S)
2 (S)
2 (S)
1 (S)
1 (S)
1 (S)
3 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
5 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
NOTE: Assembly may vary due to tolerances.
Stack cutters and spacers so the drum is properly
balanced to prevent excessive vibration.

Cutter Stacking Recommendations
3A0102D 19
10 in. (25 cm) Coarse Cut Flail Cutters (Double Space)
210 Spacers / 102 Cutters
INSTRUCTIONS: Rotate sequence 180° and repeat for
remaining shafts.
(S) Spacer (C) Carbide Cutter
3 (S)
1 (C)
2 (S)
2 (S)
1 (C)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
2 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
2 (S)
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1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
1 (C)
2 (S)
1 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
1 (S)
1 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
2 (S)
3 (S)
1 (S)
NOTE: Assembly may vary due to tolerances.
Stack cutters and spacers so the drum is properly
balanced to prevent excessive vibration.

Cutter Stacking Recommendations
20 3A0102D
6 in. (15 cm) General Cut Flail Cutters (Single Space)
234 Spacers / 84 Cutters
INSTRUCTIONS: Rotate drum 180° and repeat for
remaining shafts.
(S) Spacer (C) Carbide Cutter
12 (S)
1 (C)
1 (S)
1 (S)
3 (C)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
2 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
1 (S)
1 (C)
14 (S)
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1 (S)
14 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (S)
1 (S)
1 (S)
1 (S)
1 (S)
3 (C)
1 (S)
1 (S)
1 (S)
1 (S)
1 (S)
1 (S)
1 (S)
12 (S)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
1 (C)
NOTE: Assembly may vary due to tolerances.
Stack cutters and spacers so the drum is properly
balanced to prevent excessive vibration.