MasterCraft 55-3559-4 Owner's Manual
Belt & Disc Sander
55-3559-4
Owner’s Manual
Parts Missing or Damaged? Questions? Toll-Free Helpline: 1-800-689-9928
SPECIFICATIONS ------------------------------------------------------------------------------------ 2
SAFETY RULES----------------------------------------------------------------------------------------3
BELT & DISC SANDER FEATURES---------------------------------------------------------------4
BEFORE YOU START-----------------------------------------------------------------------------5-13
OPERATING INSTRUCTIONS----------------------------------------------------------------14-16
MAINTENANCE---------------------------------------------------------------------------------------17
TROUBLESHOOTING -------------------------------------------------------------------------18-19
PARTS SCHEMATIC AND PARTS LIST---------------------------------------------------------20
WARRANTY ------------------------------------------------------------------------------------------21
Specifi cations
Model # 55-3359-4
Motor Type: Induction
Motor Ratings: 120 V AC, 4.3 A, 60 Hz, 1/2 HP
Motor Speed: 3400 RPM (no load)
Disc Diameter: 6” (15 cm)
Disc Specifi cations: A80 psa type (Pressure Sensitive Adhesive)
Belt Size: 4 x 36” (10 x 91.4 cm)
Belt speed: 1900 SFM
Belt Tilt: 0 - 90º
Belt Grit: A80
Net Weight: 41 lb (18.6 kg)
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Table of Contents
Important Safety Rules
DANGER!! Failure to observe any of the following instructions could result in severe personal
injury to tool user and bystanders or cause damage to tool and property!
WARNING! – Read, understand and observe all instructions in this manual
before using or operating the tool for which it is written and supplied. Ensure
that anyone who is to use the tool has read and understood the instructions
provided.
• Always wear eye protection that complies with a recognized standard (CSA or ANSI).
• Wear a mask or respirator when dust is generated.
• Some dust created by power sanding contains chemicals that may cause cancer, birth defects
or other harm. Some examples of these chemicals are: lead from lead-based paint, and
arsenic and chromium from chemically treated lumber. To reduce exposure to these chemicals,
work in a well-ventilated area; use approved safety equipment; and use dust masks that are
specially designed to lter out microscopic particles.
• Keep bystanders out of the work area while operating the tool.
• WARNING! Always ensure that the work area is clear of any ammable
materials, liquids or gasses, because the use of this tool may create
sparks.
• Keep guards in place and working properly.
• Keep hands clear of sanding areas.
• Ensure sanding belt runs in the proper direction. Sanding belt must travel down at the front of
the machine.
• Ensure sanding belt is tracking properly so that it does not come off the pulleys.
• Unplug from power supply before adjusting or servicing.
• To avoid electric shock, DO NOT use in damp conditions or expose to rain.
• Use only accessories that are recommended by the manufacturer for your model.
• Grounded tools must be plugged into an outlet that has been properly installed and grounded
in accordance with all local codes and ordinances. Never remove the grounding prong from
the plug or modify it in any way. Do not use adaptor plugs. If in doubt as to whether the outlet
is properly grounded, consult a qualied electrician.
• Do not use the tool when tired or under the inuence of drugs, alcohol or medication.
• Do not wear loose clothing or jewellery. Keep hair tied back.
• Ensure the power switch is off prior to plugging in the tool.
• Ensure sanding belt or disc is not torn or loose.
• Hold workpiece rmly while sanding.
• Firmly support workpiece with mitre gage, backstop, jig or worktable when sanding with the
belt.
• AVOID kickback by sanding in accordance with directional arrows. Sand on downward side
of disc only!
• DO NOT attempt to hold pieces of material that are too small to be safely supported by hand.
Utilize special jigs or hand tools.
• Remove scrap pieces and other loose objects from the belt and disc tables before turning the
machine on.
• When sanding metal, move the metal across the belt or disc and cool it when it becomes hot.
• WARNING! Do not operate your belt & disc sander until it is completely assembled and
installed according to the instructions.
• Service on these tools should only be performed by an authorized, qualied technician.
• SAVE THESE INSTRUCTIONS.
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Know Your Belt & Disc Sander
Insert line drawing and show: (minimally)
• On/off switch
• Sanding disc
• Belt sanding area
• Disc Sanding Area
• Table angle adjustment knobs
• Dust port
• Mitre gauge
• Base – bolt-down area
• Tracking control knob
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Operating Instructions
Before You Start – Electrical
In the event of a malfunction or short circuit, grounding provides the path of least resistance for
electrical current and reduces the risk of electric shock for the operator. This tool is equipped with an
electric cord that has an equipment grounding conductor and a grounding plug. The plug MUST be
plugged into a matching outlet that is properly installed and grounded in accordance with ALL local
codes and ordinances.
DO NOT MODIFY THE PLUG PROVIDED. If it will not t the outlet, have the proper outlet installed by
an electrician.
Figure 2
IMPROPER CONNECTION of the equipment grounding conductor can result in increased risk of
electric shock. The conductor with the green insulation (with or without yellow stripes) is the equipment
grounding conductor. If repair or replacement of the electric cord or plug is necessary, DO NOT
connect the equipment grounding conductor to a live terminal.
CHECK with a qualied electrician or service personnel if you do not completely understand the
grounding instructions, or if you are not sure if the tool is properly grounded.
This tool is intended for use on a circuit that has an outlet that looks like the one illustrated. The
original tool has a grounding plug that looks like the plug illustrated (Figure 2).
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Use of Extension Cords
USE ONLY THREE-WIRED EXTENSION CORDS that have 3-prong plugs and 3-holed outlets that
accept the tool’s plug. Repair or replace damaged or worn cords immediately.
Be sure your extension cord is properly wired and in good condition. Do not use damaged extension
cords. Always replace a damaged extension cord.
When using an extension cord, be sure to use one heavy enough to carry the current your product will
draw. An undersized cord will cause a drop in line voltage, resulting in loss of power and overheating.
The table below shows the correct size to use according to the cord length and the amperage draw
of the tool (specied on the nameplate). When in doubt, use the next heavier gauge. The smaller the
gauge number, the heavier the cord. (AWG = American Wire Gauge).
Minimum Gauge for Extension Cords (AWG)
(when using 120 volts only)
Ampere Rating Total Length of Cord in Feet (meters)
More Than Not more Than 25’ (7.6m) 50’ (15m) 100’ (30.4m) 150’
(45.7m)
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12 Not Recommended
Use a separate electrical circuit for your tools. This circuit should not be less than a #12 gauge wire,
and should be protected with a 15 A time-lag fuse or breaker. Before connecting the motor to the
power line, ensure the switch is in the OFF position and the electric current is rated the same as the
current stamped on the motor’s nameplate. Running at a lower voltage will damage the motor and this
damage is not covered by warranty.
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Before You Start - Unpacking
Your Mastercraft belt & disc sander has been shipped completely assembled with the exception of: the
sanding disc, disc guard, mitre gauge, work support and worktable.
Carefully remove all parts from the shipping carton. Do not discard the packing material until you have
carefully inspected the belt & disc sander, identied and located all parts, and satisfactorily operated
your new tool. If all parts are present, proceed to assembly.
Examine all parts to ensure no breakage has occurred during shipping. Missing or damaged parts
should be replaced before use. Should you discover or suspect that parts are missing or damaged, do
not return to the store. Call (Toll-Free) the number on the front of this Owner’s Manual.
Parts & Accessories List
1. Socket head screws
2. Sanding disc
3. Mitre gauge
4. Washers
5. Work support
6. Hex key 15/64” (6 mm?)
7. Worktable
8. Adjustment knob
9. Table connection bracket
10. Phillips screws
Before You Start – Assembly and Installation
WARNING! Always ensure the sander is unplugged prior to attempting any assembly,
installation or changing of parts and accessories.
Mounting the Sander to the Workbench
CAUTION: If during operation there is any tendency for the sander to tip over, slide or walk on
the supporting surface, the sander should be properly mounted to a workbench or stand.
1. Position the sander on the workbench where you expect/intend to use it.
2. Mark the workbench through the mounting holes located in the sander base. Drill holes in the
workbench at the marks.
3. Using long bolts, washers, locking washers and nuts, as shown (not supplied), secure the
sander to the workbench. Note: All bolts should be inserted from the top. Washers and hex
nuts should be fastened from the underside of the workbench.
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