Westinghouse PT20360 User manual

INSTRUCTION MANUAL
PT20360
4½" ANGLE GRINDER
C US
7.5A
950 W
rpm
11,000
120V
60Hz
4½
INCHES
Note: Before operating this tools,
read this manual and follow safety
rules and operating instruction.

GENERAL SAFETY RULES
2
WARNING!
Please read and understand all instructions. Failure to follow all instructions listed below may result in electric shock,
fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
Work Area
1. Keep your work area clean and well lit. Cluttered benches and dark areas will invite accidents.
2. Do not operate power tools in explosive atmospheres such as in the presence of flammable liquids,
gases, or dust. Power tools create sparks which may ignite the dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool. Distraction can cause you to
loose control.
Electrical Safety
1. Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs
with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
2. Avoid body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators. There is
an increased risk of electric shock if your body is grounded.
3. Don’t expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of
electric shock.
4. Do not abuse the cord. Never use the cord to carry the tools or pull the plug from an outlet. Keep the cord
away from heat, oil, sharp edges or moving parts. Damaged cords should be replaced immediately by qualified
repair personnel. Damaged cords will increase the risk of electric shock.
5.When operating a power tool outside, use an outdoor heavy duty extension cord and use in conjunction
with a residual current device (RCD).
6.If operating a power tool in a damp location is unavoidable, use a residual current device (RCD)
protected supply. Use of an RCD reduces the risk of electric shock.
7. Recommendation for the use of a residual current device with a rated residual current of 30 mA or less.
Personal Safety
1. Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use the
tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power
tools may result in serious personal injury.
2. Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools with your finger on the
switch or plugging in tools that have the switch on may invite accidents.
3. Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left attached to a
rotating part of the tool may result in personal injury.
4. Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enable better
control of the tool in unexpected situations.
5. Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, clothing, and gloves
away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts.
6. Use safety equipments. Always wear eye protection. Dust mask, non-skid safety shoes, hard hat, or hearing
protection must be used for appropriate conditions. Ordinary eye or sun glasses are NOT suitable for eye protection.

GENERAL SAFETY RULES
SPECIFIC SAFETY RULES
3
Tool Use and Care
1. Use clamps or other practical way to secure and support the work piece to a stable platform. Holding the
work piece by hand or against your body is unstable and may lead to loss of control.
2. Do not force the tool. Use the correct tool for your application. The correct tool will do the job better and
safer at the rate for which it is designed.
3. Do not use the tool if the switch cannot be turned on or off. Any tool that cannot be controlled with the switch
is dangerous and must be repaired before use.
4. Disconnect the plug from the power source before making any adjustment, changing accessories, or
storing the tool. Such preventive safety measures can reduce the risk of starting the tool accidentally.
5. Store idle tools out of reach of children or other untrained persons. Tools are dangerous in the hands of
untrained users.
6. Maintain tools with care. Keep the cutting tools sharp and clean. Properly maintained tools with sharp
cutting edges are less likely to bind and are easier to control.
7. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may
affect the tools operation. If damaged, have the tool serviced before using. Many accidents are caused by poorly
maintained tools.
8. Some accessories suitable for one tool may become hazardous when used on another tool. Please check
all accessories to be used are suitable.
Service
1. Tool service must be performed only by qualified repair personnel. Service or maintenance performed by
unqualified personnel could result in a risk of injury.
2. When servicing a tool, use only identical replacement parts.
1. Always use proper guard with grinding wheel. A guard protects operator from broken wheel fragments.
2. Accessories must be rated for at least the speed recommended on the tool warning label. Wheels and
other accessories running over rated speed can fly apart and cause injury.
3. Hold tool by insulated gripping surfaces when performing an operation where the cutting tool may contact
hidden wiring or its own cord.
4. Make sure the grinding wheel is not contacting the work piece before the switch is turned on.
5. Grinding wheel and guard must be securely attached as described in this operating manual before
connecting the angle grinder to power source.
6. Grinding wheel must be stored in a dry place.
7. Always hold the grinder firmly with two hands while working and at all times when it is running.
8. Use only quality certified grinding wheels.
9. Keep hands away from rotating parts.
10. Be careful not to damage the spindle, outer flange and inner flange. Damage to these parts could result in
wheel breakage.
When starting the tool (install with a new or replacement wheel), hold the tool in a well protected area and let it
run for one minute to check if the wheel is good or not. Never starting the tool while the operator is standing at in line
with the wheel.

ASSEMBLY
FEATURES
4
This angle grinder has been designed for professional grinding and cutting applications. This angle grinder has been
designed for grinding and cutting applications. Please refer to Fig. 1 to familiarize yourself with the major components of
this tool before using it.
1. Spindle Lock
2. Lock-on Switch
3. Auxiliary Handle
4. Wheel Guard
5. Quick Release Lever
6. Outer Flange
Prior to assembly and adjustment always unplug the tool.
Installing the Grinding Wheel
1. Depress and hold down the spindle lock. To prevent damage to spindle or spindle lock, always allow motor to
come to a complete stop before engaging spindle lock.
2. Remove the outer flange with spanner turning in anti-clockwise direction. Do not remove the inner flange.
3. Make sure the slot on the inner flange is engaged with the square neck of the spindle.
4. Place the grinding wheel over the spindle with the depressed center against the inner flange(see Fig.3).
5. Depress and hold down the spindle lock again, mount the outer flange and securely tighten it with spanner
provided clockwise.Do not overtighten it.
Mounting the Auxiliary Handle
The tool has three screwed holes on top, left and right side of the gear housing. Operators can choose any one of
them to mount the auxiliary handle depending on specific working condition and their own habit.
Adjusting the Wheel Guard
This tool is fitted with a wheel guard. The closed segment of the guard can be adjusted to different angles.
1. Pull the quick release lever toward outside so as to enlarge the circular collar of wheel guard.
2. Turn the wheel guard to a desired angle. Pull back the quick release lever to lock the guard.
3. Make sure the guard is firmly secured in place. If the guard is too loose after pulling back the quick release lever,
pull up the lever, properly adjust the nut on the guard and pull back the lever again.
6
12
3
4
5

OPERATION
5
This heavy duty grinder is designed for the following purposes:
1. Removal of casting burrs and finishing on various types of steel, bronze, aluminum materials and castings.
2. Beveling and finishing weld seams
3. Grinding of welded sections cut by means of welding.
4. Grinding of synthetic resin bricks, marbles etc.
5. Cutting thin wall tubes and small size metal materials.
CAUTION! Never cover air vents. They must always be open for proper motor cooling.
To start your grinder:
1. Plug the cord set into a power socket;
2. The grinder will be turned on when the on/off switch is pushed forward to the end.
3. For continuous operation, press at the front end of the switch button to make it engage in the “on” position.
To stop your grinder:
1. Release the on/off switch. Or press at the end of the switch button to make it spring back when the switch is
engaged in the lock-on position.
For Proper Operations
1. Before starting the grinder, put on safety glasses and make sure that the grinding wheel, guard and the tool are
in good condition and correctly fitted.
2. Always hold the tool firmly with one hand on the rear handle and the other on the side handle.
3. Turn the angle grinder on and then apply the grinding wheel to the workpiece.
4. In general, keep the edge of the wheel at an angle of about 30° for roughing and about 15° for finishing.
5. Move the grinder back and forth or up and down over the work area.
6. Use just enough pressure to keep the grinder from chattering or bouncing.
7. Avoid overloading the tool for a long time, heavy pressure will decrease its speed and put a strain on the motor .
8. Lift the grinder away from the workpiece before turning your grinder off.
WARNING!
Never use your grinder without wearing eye protection. Following this rule will reduce the risk of serious personal
injury.
DANGER!
1. Never attach a wood cutting or carving blade of any type to this angle grinder.
2. Never use your grinder with guard removed.
3. Failure to follow this rule could result in serious personal injury.
WARNING!
If any of the following events occurs during normal operation, the power supply should be shut off immediately and
then the tool should be inspected thoroughly and repaired by a qualified person if necessary:
1. The rotating parts get stuck or speed drops abnormally low.
2. The tool shakes abnormally and accompanied by some unusual noise.
3. The motor housing gets abnormally hot.
4. Heavy sparks occurring around the motor area.

MAINTENANCE
ACCESSORIES
SPECIFICATIONS
6
Warning !
Maintenance and repair work should only be done by a qualified service technician. When servicing a tool, it’s
recommended to use only spare parts provided by the manufacturer of the tool.
Preventive maintenance performed by unauthorized personnel may result in misplacing of internal wires and
components which could cause serious hazard.
CAUTION !
Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance.
Regularly clean the tool’s air vents with compressed dry air. do not attempt to clean by inserting pointed objects
through openings.
CAUTION!
Certain cleaning agents and solvents may damage plastic parts. Some of these are: gasoline, carbon tetrachloride,
chlorinated cleaning solvents, ammonia and household detergents that contain ammonia.
To ensure safe use and maximize service life of your tool, following instructions should be observed:
1. Regularly inspect the grinding wheel----ensure that the grinding wheel is free of cracks and surface defects.
Replace the grinding wheel when it has worn out.
2. Periodically check the mounting screws—regularly inspect all mounting screws and ensure that they are
properly tightened.
3. Regularly clean the air vents of the tool.
4. Check and replace carbon brushes when necessary. When it’s necessary, peel off the labels on both sides of
the tool. Remove the carbon brush caps with screwdriver. Pull out the carbon brushes for inspection. If the
brushes are worn out, they should be replaced with a new pair of brushes. Note that the brushes must be
replaced in pair. Make sure the brush can be slided freely inside the brush holder. Put back the brush caps and
tighten them with screws. Be careful not to overtighten the screws.
spanner-------------------------------------1pc
side handle---------------------------------1pc
carbon brush ------------------------------1pair
instruction manual------------------------1pc
Model: PT20360
Voltage: 120V～60Hz
Rated Power: 950w/ 7.5A
Wheel Size: 115mm
No Load Speed: 11,000 RPM

PART LIST
SAVE THESE INSTRUCTIONS FOR REFERENCE
7
1 Z120009
2 Z130001
3 H7J1002
4 C700006
5 C110410
6 C40000W
7 I71000B
8 C320505
9 J71000A
10 C810310
11 C610414
12 C410411
13 C430408
14 M73000B
15 E126001
16 I000003
17 C610410
18 K75000C
19 C421105
20 C041111
21 E220810
22 C534225
23 C010510
24 C534230
25 Z00000V
26 H7B100A
27 H7A1007
28 M71000C
29 C320002
30 K750009
31 E126000
32 I00000J
33 C620410
Outer Flange 1 Q235 S1M115C-101
Inner Flange 1 Q235 S1M115C-102
Quick Release Guard Lever 1
Connecting Rod 1 Q235
Rivet 4×10 1 GB/T871-86
Washer 1 Q235
Wheel Guard 1 Q235
Square Nut M5 1 GB/T39-88
Spindle 1 40Cr
Woodruff Key 1 GB1099-79
Philips Pan Head Screw M4X14(4)
4 GB818-85
Spring Washer(8) 7 GB93-87
Flat Washer (8) 6 GB95-85
Front Cover 1
Bearing 6001 1 GB/T276-94
Bearing Retaining Plate 1 Q235
Philips Pan Head Screw(3) 3 GB818-85
Bevel Gear 1 20CrMnAlA S1M115K-102
Wave Washer 1 GB/T955-87
Circlip for Shaft 10 1 GB/T894.1-86
Needle Bearing 1 GB5801-86
Philips Pan Head Screw 4.2X25 (4) 2 GB845-85
Open ring 1 S1M115K3-110
Philips Pan Head Screw 4.2X30 (4) 2 GB845-85
Spring 1 65Mn S1M115C-120
Spindle Lock Pin 1
Auxiliary Handle 1
Gear Housing 1
Locknut M6 1 GB/T889.2-2000
Pinion 1 20CrMnALA S1M115K-106
Bearing 6000 1 GB/T276-94
Bearing Retaining Plate 1 Q235
Countersunk ScrewM4X10 (2) 2 GB819-85

PART LIST
8
34 GB72001
35 E120607
36 H001006
37 H72100C
38 C514270
39 GB71001
40 G300002
41 I740002
42 H7F1002
43 B670008
44 C534212
45 H7C100A
46 G53000F
47 Z020003
48 G409151
49 H7G1002
50 I010001
51 H71100C
52 H7D100A
53 B770003
54 C534210
55 C534214
56 H751003
57 H00200G
58 G216008
59 H741003
60 G350005
61 G113001
62 F205001
Rotor 1 S1M115K.01
Bearing607 1 GB/T276-94
Bearing Sleeve 1 T35.￠19X￠22X7
Air Baffle Plate 1 PA6-GF30
Cross Self-tapping Screw 4.2X68(2) 2 GB845-85
Stator 1 S1M115K.02
2.8 plug spring 6
Magnesium Alloy Sleeve 1
Pull Rod Button 1 PA6-GF30 S1M115K3-107
Date Nameplate(Right) 1
Philips Pan Head Screw 4.2X12(2) 2 GB845-85
Brush Cap (Left) 1 PA6-GF30
Brush Holder(2) 2 S1M115K.04
Coil Spring(2) 2 S1M115K-114
Carbon Brush(2) 2 S1M115K.03
Pull Rod 1 PVC S1M115K3-108
Cable Clamp 1 S1M115H-111
Motor Housing 1 PA6-GF30
Brush Cap(Right) 1 PA6-GF30
Logo Nameplate(Left) 1
Philips Pan Head Screw 4.2X10(4) 4 GB845-85
Philips Pan Head Screw 4.2X14(3) 3 GB845-85
Rear Cover (Right) 1 PA6-GF30
Cable Sleeve 1
Cable & Plug 1 18AWG S1M115K3
Rear Cover(Left) 1 PA6-GF30
Y Lug 2
Switch 1
Capacitor 1 Q235 借用S1M115C
SAVE THESE INSTRUCTIONS FOR REFERENCE

9
EXPLODED VIEW