GAS-POWERED CUTOFF SAW Item# 999000 OWNER’S MANUAL Read carefully and understand RULES FOR SAFE OPERATION and instructions before operating. Failure to follow the safety rules and other basic safety precautions may result in serious personal injury.
Introduction Thank you for choosing a Northern Tool + Equipment product, the Cutoff Saw, Item# 999000. For future reference, please complete the owner’s record below: Model:____________________________ Purchase Date:_______________________ Save the receipt, warranty and this Owner’s Manual. It is important that you read the entire manual to become familiar with this product before using it. This Manual contains operating and safety instructions for your cutoff saw.
Table of Contents 3–5 5–8 9 10–13 10–11 11–12 12 12 12–13 13 13 13 13 13–15 13–14 14 14–15 15 16 17 18–25 18 19 20 21 22 23 24 25 Main parts and their functions Safety precautions Specifications Operation guide to the cutoff saw 1. Before starting 2. Starting 3. Operation 4. Emergency Stopping 5. Notes on operation Adjustment of cutoff saw 1. Adjusting V-belt tension 2. Adjusting carburetor 3. Adjusting blade guard Maintenance & repair of cutoff saw 1. Cleaning and maintenance of air filter 2.
Main parts of the cutoff saw and their functions This product is composed of two main sections: a gasoline-powered 2-stroke engine and a driving/cutting system. When engine speed is up to 3800 RPM, the cutting blade, driven by the engine via a belt transmission system, begins to rotate at a high speed and is ready for cutting work. Shown below are the main parts of the cut-off saw and their corresponding function descriptions (Ref. Fig. 1): 1. Blade 2. Flanges 3. Hexagon Bolt 4. Blade Guard 5.
. Front Handle Used to securely hold the saw while under operation. 6. Spark Plug Cover A removable cover for access to the spark plug. 7. Kill Switch Engine stops when this switch is pressed and held. 8. Full Throttle Lock Button Locks the throttle in full open position by pressing this button while the trigger is fully depressed. Pressing and releasing the trigger returns the throttle to idle position. 9. Throttle Trigger Controls engine speed by manipulating the throttle.
20. Blade Guard Adjusting Lever Allows adjustment of blade guard to direct dust away from operator. SAFETY PRECAUTIONS: As the cutoff saw is a high speed power tool, improper use of this saw might be hazardous. To avoid property damage or personal injury, it is EXTREMELY IMPORTANT to read, fully understand and observe the following safety precautions before operating this cutoff saw. 1. Worksite Requirements: The worksite should be free of any materials or objects that are flammable or explosive.
Always install the blade so that the arrow on the blade points in direction of the rotation of the spindle. Before carrying or transporting your cutoff saw, make sure the engine is OFF. Never leave the engine running while unattended (e.g. on the ground). Proper tension of the V-belt is important. In order to avoid a false setting, the tensioning procedure must be followed as described in your manual. Always make sure the hexagonal collar nuts for the cast arm are tightened securely.
Cutting masonry, concrete and other materials with silica in their composition may give off dust containing crystalline silica. Silica is a basic component of sand, quartz, brick clay, granite and numerous other minerals and rocks. Use of an approved respirator is recommended. Do not cut materials containing asbestos, as asbestos dust can cause severe physical injury. Do not cut materials containing highly volatile or flammable substances. 4. Inspection of the cutoff saw before use: 1.
torsion load on the blade and may cause it to break or shatter. Only move the machine along a straight line, forward or “to and fro” in the cutting direction. 5. When cutting, position the saw at an appropriate distance so that your body is clear of the blade attachment yet you don’t have to overreach. 6. Release the pressure on the saw when the blade completes a cut. The cutoff portion of the object may drop, so make sure it won’t hit any part of your body or pinch the blade. 7.
Specifications: Model Type Cylinder bore Piston stroke Displacement Max. output Speed at max. output Max. torque Engine Idle speed Lock-up speed of clutch Min. fuel consumption Fuel mix Gasoline Oil Mix ratio Fuel tank capacity Ignition type Engine Electrode gap of spark plug Spark plug thread Blade 1E49F (Engine Family 3ZHIS.0642CR) Single-cylinder, two-stroke, air-cooled 1.96" 1.36" 64.1 cc 3.8 HP 8500 RPM 3.5N.m 2400 RPM 3800 RPM 544 g/(kw.h) Minimum octane rating 93 Two stroke engine oil 75:1 0.
Operation Guide to Cutoff Saw 1. Before starting: Preparation includes clearing and arranging work surroundings, wearing proper clothing and protection, and inspecting the cutoff saw. In preparation, please follow the procedures described in the appropriate section of this manual. For additional preparation work before starting, please follow instructions given below: Fueling: a) Before starting, check if there is any fuel left in the fuel tank.
Tensioning the V-belt: (Ref. Fig.6): Loosen and unscrew the two hexagon bolts (2) on the V-belt guard (1) and then remove the Vbelt guard. Loosen the three hexagon bolts (4) on the bearing plate (3). Turn the tensioning nut (5) clockwise until the V-belt is tensioned. Tighten the three hexagon bolts on the bearing plate. Fit the V-belt guard and fit and tighten the two hexagon bolts (2). Fig. 6 2. Starting (Ref. Fig.
Hold the front handle with left hand and firmly press the cutoff saw against ground, place the right foot on the carburetor box cover. Holding the starter grip (5) securely, slowly pull out the starter rope for a short distance, and then pull it through quickly and strongly. Note: Starter rope is 3 3/4-ft. long; do not pull the rope out more than its length otherwise it may break or cause damage to the starting system. • Do not let go of the starter grip.
After the saw works for a certain period of time, let the engine idle on for a while to dissipate the heat. This will prevent some engine parts (ignition system, carburetor, etc.) from being damaged by over heating. ADJUSTMENT OF CUTOFF SAW 1. Adjusting V-belt tension: Refer to the instruction described above in the section titled “Tensioning the V-belt.” 2.
. 1. Set the choke lever to 2. Pull the filter cover lock lever (7) backward to let the filter cover (1) swing open. Then take out in succession prefilter (2), pre-filter (3), filter housing (4), paper air filter (5), and the secondary filter (6). Then clean and dry all these parts. Replace if any are damaged. Finally replace all of them in succession and close the filter cover. 2. Maintenance of spark plug (Ref. Fig. 12): Wrong fuel mixture (too much engine oil in the gasoline), Fig.
10. To tension the rewind spring, first guide the rope through the notch on the edge of the rope rotor and form a loop, use it to turn the rope rotor 4–5 times counterclockwise. 11. Then hold the rope rotor tight, pull out the twisted rope and untangle it. 12. Release the rope rotor, slowly let go of the starter rope so that it is wound up on the rope rotor. 13. Refit the flywheel/starter cover (1) and screw in the four screws (2). 4. Replacing pawl (Ref. Fig.
Fuel tank V-belt Air filter (all filter components) Cylinder fins Spark arresting screen in the muffler Carburetor Spark plug Nuts and bolts (but not adjusting screws) Rubber buffer Blade Support/Bracket Check Replace Clean Clean Replace Clean Replace Clean Inspect Clean or replace Check idle speed (the cutting wheel must not run) Adjust idle speed Adjust electrode gap Retighten Replace Check and clean Replace Clean √ In the event of a malfunction Monthly Weekly Every time after refueling As require
Storing Cutoff Saw For long periods of storage: 1. Drain and clean the fuel tank, run engine until carburetor is dry. 2. Thoroughly clean the cutoff saw; tighten all nuts and bolts (except for adjusting screws). 3. Remove the blade and loosen the V-belt. Notes on transport and storage: 1. Avoid knocks and bumps. 2. Abrasive blades must not be exposed to direct sunlight or other sources of heat during transport and storage.
1. Crankshaft Housing Assembly Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Ref 1E49F01011 1E49F01010 1E49F01006 1E49F01011 GB97.
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5. Handle & Main Cover Assembly Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Ref 1E49FA09001 1E49F09016 1E49F09013 1E49FA09002 1E49FA5001 GB/T845- 85 1E49FA09010 1E49F09010-03 1E49F09010-02 1E49FA09003 1E49F09006 1E49FA09008 GB/T845-85 1E49FA06002 1E49F05004 Description Main Cover Side sealing cover Front sealing cover Spark plug cover Kill switch Screw ST2.
6. Air Filter Assembly Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Ref 1E49FA1004 1E49F1003-02 1E49F1003-01 1E49FA10001 1E49F10006 1E49F10007A GB/T845-85 1E49FA10003 1E49FA10002 1E49F06007 1E49F07016 1E49F10010 1E49FA10005 1E49FA10006 GB119-1986 1E49F07012 Description Filter cover Pre-filter Pre-filter Filter housing Paper Air Filter Secondary filter Screw ST2.
7. Cutter Assembly Item 1 2 3 4 5 6 7 8 9 10 11 Ref EHS40001010 EHS40001011 EHS40001013-C EHS40001014 EHS40001015 EHS40001016 EHS40001006A EHS40001007A EHS40001026 EHS40001017 EHS40001022-D Description Qty Item Ref Description Qty Hexagon bolt 1 16 GB/T65-85 Screw M6×6 1 Washer 1 17 GB68-85 Screw M6×12.
8. Transmission Box & Assembly Item Ref EHS40002007A Description Transmission box Qty Item 1 12 2 1E49F01006 Cover 3 13 3 1E49F07019 Screw M6×16 3 14 4 1E49F01010 Plug 3 15 5 1E49F01011 Screw M5×20 5 16 Clamping lever 1 17 Cover 1 18 1 6 7 EHS40002005A EHS40002006A 8 1E49F07017 Screw M5×12 2 19 9 EHS400-02008 V-belt 1 20 Belt Tensioner 1 21 Wheel shaft 2 22 10 11 EHS40002001A EHS400-0300303 25 Ref EHS40003003-01A EHS40003003-02A GB97.
