Last updated: Sun May 12 16:40:55 2013
Jacobsen Sno-Burst Operator Manual
Product No. 51610
Serial No. 1601 and up
If incorrectly used, this machine can cause severe injury. Those who use and maintain the machine should be trained in its proper use, warned of its dangers, and should read the entire manual before attempting to set up, operate, adjust or service the machine.
Safe Practices for Snow ThrowersEvery operator of this snow thrower should read and understand the following safe practices. These practices will aid in the safe and proper use of the unit, and help guard against inherant dangers associated with such equipment.
- Regard your snow thrower as a piece of power equipment and teach this regard to all who operate it.
- Read the operator's manual carefully. Be thoroughly familiar with the controls and proper use of the equipment. Kown how to stop the unit and disengage the controls quickly.
- Never allow children to operate equipment. Never allow adults to operate equipment without proper instruction.
- Keep the area of operation clear of all persons, especially small children and pets.
- Exercise caution to avoid slipping or falling, especially when operating in reverse.
- Check the snow thrower to make certain it is in good operationg condition.
- Check impeller to be sure it is free of any obstruction.
- Thoroughly inspect the area where the equipment is to be used and remove all door mats, sleds, boards, wires and other foreign objects.
- Do not operate equipment without wearing adequate winter outer garments. Wear footwear which will improve footing on slippery surfares.
- Handle fuel with care; It is highly flammable.(A) Use approved fuel container.(B) Never add fuel to a running engine or hot engine.(C) Fill fuel tank outdoors with extreme care. Never fill fuel tank indoors. Never fill fuel tank while smoking.(D) Replace gasoline cap securely and wipe up spilled fuel. Dispose of gas saturated rags properly.
- Never attempt to make any adjustments while engine is running (except where specifically recommended by manufacturer.)
- Let engine and machine adjust to outdoor temperatures before starting to clear snow.
- Give complete and undivided attention to the job at hand.
- Do not put hands or feet near rotating parts. Keep clear of discharge opening at all times.
- Exercise extreme caution when operating on or crossing a gravel drive, walks, or roads. Stay alert for hidden hazards and traffic.
- After striking a foreign object, stop the engine, remove key, thoroughly inspect the snow thrower for any damage, and repair the damage before restarting and operating the snow thrower.
- If the unit should start to vibrate abnormally, stop the engine, remove key and check immediately for the cause. Vibration is generally a warning of trouble.
- Stop the engine and remove key whenever you leave the operating position, before unclogging the impleller housing or dischareg, and making any repairs, adjustments, or inspections.
- Stop the engine whenever leaving the snow thrower unattended. Remove the key.
- When cleaning, repairing, or inspecting make certain impeller, and all moving parts have stopped. Turn key to "STOP" position and remove key.
- Do not run engine indoors. Exhoust fumes are dangerous.
- Do not clear snow across the face of slopes. Exercise extreme caution when changing direction on slopes. Do not attempt to clear steep slopes.
- Never operate snow thrower without guards, plates, or other safety protective devices in place.
- Never operate snow thrower near glass enclosures, automobiles, window wells, drop-offs, etc. without proper adjustment of snow discharge argle. Keep children and pets away.
- Do not over load machine capacity by attempting to clear snow at too fast a rate.
- Never direct discharge at bystandars or allow anyone in front of unit.
- Never operate snow thrower without good visibility or light. Always be sure of your footing and keep a firm hold on the handles and walk, never run.
- Keep in full command of the snow thrower.
Maintenance and Storage
- Follow implicitly the manufacturer's recommendations for maintenance.
- Have a competent service man make thorough inspection of the snow thrower before the snow season begins.
- Check all hardware at frequent intervals for proper tightness to be sure equipment is in safe working condition.
- Never store machine with fuel in the fuel tank or fuel container inside a building where open flam or spark are present. Allow engine to cool before storing in any enclosure.
- Alwaly refer to operator's manual for important details if snow thrower is to be stored for an extended period.
- Run machine a few minutes after throwing snow to prevent freeze up of parts.
- Keep the snow thrower and gasoline container in locked storage to prevent children from palying tampering with them.
- Always remove the ignition key.
|Engine:||Jacobsen J-501 ST (2 cycle)||HAN-D-MIX, Jacobsen Premium 2Cycle Oil|
|Starter||Recoil||6 oz cans (0.177 Ltr.)|
|Maximum engine speed||4500 RPM||4 Pak No. 502466|
|Horsepower (Mfgr. Rating)||3|
|12 oz. cans (0.355 Ltr.)|
|Fuel Capacity:||2 qt. (1.9 Ltr.)||4 Pak No. 502463|
|Case (24 cans) No. 502464|
|Fuel:||Regular grade gaseline (leaded or unleaded) mixed
with Jacobsen Premium 501 Two Cycle Oil.
|Clearing Width:||20" (508 mm)|
|Wheels:||7" (178 mm) Dia.||Jacobsen Premium 501 2cycle engine oil is|
|Handle:||2 Position Adjustable||available at Jacobsen Dealers everywhere.|
How to Order Repair Parts
This manual is an operating and service guide for the operator. We recommend that you read it carefully before operating your unit and that you follow the simple adjustments and maintenance listed. We do not recommend that you make major repairs beyond necessary adjustments and simple parts replacements required to keep your unit in good operating condition.For assistance in getting the most out of your unit, and for overhaul, winter or summer storage, tune-up, and repair service, we recommend yoru Authorized Jacobsen Dealer, who is prepared to help you.
To eliminate error and speed delivery:
- Write your NAME and ADDRESS on your order plainly.
- Explain WHERE and HOW to make shipment.
- Give PRODUCT NUMBER, NAME, and SERIAL NUMBER that is stamped on the NAME PLACE or SERIAL PLATE of your product.
- Order by QUANTITY DESIRED, the PART NUMBER, and the DESCRIPTION OF PART.
- Send your order to or visit your nearest AUTHORIZED JACOBSEN SERVICE DEALER.
- INSPECT ALL SHIPMENTS ON RECEIPT. If any parts are damaged or missing, file a claim with the carrier before accepting.
- Do not return material to your nearest AUTHORIZED JACOBSEN SERVICE DEALER without a letter of explanation. Make a list of all returned parts, show your name and address, and include it with the shipment. TRANSPORTATION CHARGES MUST BE PREPAID.
The serial number decal is located on the lower rear portion of the R.H. frame. We suggest you record this number for ready reference.
Definition of Directions
As used throughout this manual, the following definitions apply: Right and Left refer to the operator's right or left when standing behind the machine in the normal operating position. Forward and Rearward likewise refer to direction from the viewpoint of the operator. Remove upper handle, machine, wheels and bag of parts from shipping carton. (See Illustration 2 for Reference Numbers) Mount Wheels (See Figure 1)
- Using hammer, secure 3/8" push on nut (Ref. 35) to one end of axle shaft (Ref. 33).
- Slide one of the wheels (Ref. 32) onto shaft. Be sure outside of wheel faces nut. (Inside of wheel is ribbed side. See Figure 1)
- Add 3/8" flat washer (Ref. 36) and slide shaft through axle holes in muffler assembly (1).
- Work over cardboard; and turn machine on side that has wheel mounted. Place a woob block under wheel so that push-on nut contacts block.
- Slide second flat washer and wheel over shaft (inside of wheel is ribbed side. See Figure 1). Place remaining push-on nut over shaft end and tap with hammer to secure.
- Place machine in upright position.
- Slide upper handle (Ref. 34) through holes in cowling. Access to mounting holes has been provided on each side of machine.
- The upper handle may be mounted in either the high or low position. To obtain the low handle position, insert bolts (Ref. 37) through the two upper holes on each side. To obtain the high handle position, insert bolts through the two lower holes on each side. See Figure 2.
- Tighten all four bolts securely. Nuts are already in place on inside of lower handle.
All controls are located on cowling console (See Figure 3).
When heavy or drifted snow is encountered the Power Burst control provides reserve power. Push Power Burst knob in to activate, and pull knob out to deactivate reserve power. The Power Burst control will automatically be deactivated each time the engine is restarted.
Pull choke out to aid in starting engine; this provides a richer fuel mixture for easier starting.
Two keys are furnished in bag of parts. Turn key to Run postition before pulling starter handle. Turn key to STOP to stop engine. Remove key to prevent unauthorized use.
Pull starter handle to prime and start engine. Do not let rope snap back from extended position as handle may hit and damage other controls.
Use dischareg control to direct snow in desired direction. Push in and rotate discharge control to turn vanes; then, pull control rearward to insure it is locked in pasition. Three positions allow snow to be thrown straight forward, to the left or right.
To avoid possible serious bodily injury do not allow anyone near impeller area or in front of unit when engine is running. Remove foreign objects from oarea to be cleared. Do not discharge at bystanders or windows. Stop engine before leaving operator's position, refueling or servicing. Remove key to prevent unauthorized use.
Starting and Stopping
Review the Safe Practices and Operating Instructions for safe and proper use of the Snow Thrower.
KEEP OIL AND GAS OUT OF THE REACH OF CHILDREN. HAN-D-MIX, Jacobsen Premium Two Cycle oil contains petroleum distillate which is harmful or fatal if swallowed. If taken internally, do not induce vomiting. Call a physician immediately. Antidote: water or milk and two ounces (59ml) vegetable oil.
Preparation of Fuel Mixture
- Properly mixed and clean fuel is essential for trouble free engine operation. The following items are required:
- A clean and suitable container for fuel mixture, preferably a 5 gallon (19L) can, or a 2½ gallon (9.6L) can.
- Jacobsen Premium 501 Two Cycle oil, HAN-D-MIX or B.I.A. Certified Service TC-W oil.
- Fresh regular grade gasoline (leaded or non-leaded).
- Pour the contents of a 6oz (.17L) can into a clean 2½ gallon (9.5L) container and add 2.4 gallons (9L) of gas. Or, pour the contents of a 12oz (.35L) can into a clean 5 gallon (19L) container, and add 4.8 gallons (18.2L) of gas. Upon opening the can of HAD-D-MIX oil, use the entire contents.
- Screw cap securely on container and shake carefully.
- Remove cap from engine fuel tank and fill. Exercise care to avoid spilling.
- Replace caps on engine tank and fuel container.
- Wipe up any spilled fuel on snow thrower or fuel mix container. Dispose of gas saturated rags properly.
- Shake container each time tank is refilled to insure proper mixture of oil and gas.
Do not fill fuel tank while engine is running or while engine is hot.
- Check the fuel supply.
- Check impeller and discharge areas to be sure they are not frozen or obstructed. (See Clearing a Frozen or Obstructed Impeller or Discharge Area.)
To avoid possible serious bodily injury, while engine is running, never step in front of snow thrower or lean over impeller portion of unit. Loose articles of clothing such as scarves or long coats may become entangled in rotating impeller. It is advised that such clothing not be worn while operating unit or performing engine adjustments.
Prolonged running of engine in ambient temperatures above 50°F (10°C), with upper cowling in place, may likely damage engine due to overheating.
- Turn ignition switch to RUN
- Pull choke knob to full choke position.
A warm engine may not need to be choked for restart.
- Grasp upper handle in grip area with left hand and lower the handle untile the lef hand rests on the thigh just above the left knee.
- Step back with the right foot to form a stable base with the feet.
- Grasp starter girp firmly with the arm above the handle.
- Easier starting is accomplished by pulling the starter cord slowly two or three times. This will help initiate fuel flow in the pumper section of the carburetor.
- Pull slowly until resistance is felt, then pull rapidly to start engine.
If engine does not turn over freely when pulling on starter rope, the impeller or driven pulley may be frozen to the housing. Take appropriate steps to free them. (See Frozen Impeller or Discharge Area under Operation). If impeller area is clear, remove belt cover and check for ice around driven pulley.
- Rotate hips while pulling starter rope to reduce effort.
- Do NOT let start grip snap back to housing. Allow rope to recoil slowly.
- After engine has started, push choke in approximately ¼ of the way. As engine warms, continue to push choke in until engine no longer requires choke.
- Best results are obtained when snow is removed as soon as possible after it falls.
- Whenever possible, discharge snow down wind.
- Always overlap each pass slightly to assure complete snow removal.
- Rais handle slightly to engage paddles with ground to allow paddles to break up packed snow. This also provides a propelling assist.
- Remove upper cowling.
- Push control rod forward, loosen adjustment screws, and push burst bracket forward until latch rod contacts offset in control rod.
- Retighten screws.
- Make sure Power Burst control rod is on right hand side of latch rod, then replace cowling.
- Insert terminal and spork plug wire through small opening in spark plug cover and bring wire out through large opening in cover.
- With spark plug installed in engine, snap terminal around nut on top of spark plug. Slide cover over spark plug.
- Remove upper cowling.
- Lubricate idler arm (Illustration 1, #20) between arm and frame with grease every 25 hours or before storage.
- Remove upper cowling.
- Lubricate discharge control rod (Illustration 1, #50) at pivot hole in bracket with grease every 25 hours.
To stop engine, turn ignition key to STOP. Remove key to prevent unauthorized use. When snow thrower is not being used, place deflector vanes in forward position to prevent them from taking a set.
The machine is designed to throw snow. It will also throw sticks, stones, and other objects picked up by the impeller. Thrown objects can result in severe injury or porperty damage. To avoid possible serious bodily injury: Do not allow anyone near impeller area or in front of unit when engine is running. Remove foreign objects from area to be cleared. Do not discharge at bystanders or windows. Stop engine before leaving operator's position, refueling, or servicing. Remove key to pevent unauthorized use.
Preparing for Operation
Before the first snow fall, the snow removal area shold be cleared of all sticks, stones, etc. that may be picked up by the impeller. Any obstacle that may be covered by snow should be marked to prevent the impeller from being driven into it.
The snow impeller has two replaceable paddles attached with 6 screws each. Their tightness should be checkd, particularly after replacement or prolonged use. Torque to 45 in-lb (.5 kg-m).
Frozen Impeller or Discharge Area
Shut engine off and remove key. DO NOT at any time place any part of your body in the impeller housing or discharge area. Severe injuries can result when an operator tries to loosen a frozen impeller and its restraining force is suddenly released carrying his hands and fingers into the tight space between the impeller and housing.
If discharge area becomes plugged, pull machine away from snow and allow to run a few seconds. If this does not clear area, move discharge control from left to right a few times to loosen snow.
Deep or Drifted Snow
In deep, drifted, or banked snow, push the Power Burst knob in to obtain increased engine RPM and faster paddle action.
Allow the engine to run for at least three minutes after blowing snow to thoroughly melt down and dry off snow. Turn iginition switch to STOP; Remove key.
Never store machine with fuel in the fuel tank or fuel container inside a building where open flame or spark are present. Allow engine to cool before storing in any enclosure.
Removal of upper cowling is only necessary to check spark plug, lubricate idler arm and discharge control, or adjust Power Burst. Carburetor adjustment can be made with the cowling in place.
For engine servicing, contact you local authorized Jacobsen dealer.
Upper Cowling Removal and Replacement
To remove upper cowling, take out five screws (Illustration 1, #70) and lift cowling off.
To replace upper cowling, make sure Power Burst control rod is on right side of latch rod (Figure 6). Replace cowling and secure with screws. Be sure that groove on hight hand side of upper cowling fits over lower cowling (Illustration 1). Also, make sure tab on left hand side of upper cowling is positioned to the inside of belt guard (Illustration 1, #72).
When engine is running, the impeller and paddles are always rotating. Rotating paddles will throw objects which are in their path. Therefore, to avoid possible serious bodily injury, before performing engine (carburetor) adjustments, cleare area of bystanders and debris. Stand on the left hand side of the unit, clear of the impeller and discharge area, when adjusting carburetor.
The carburetor is pre-set at the factory for altitudes up to 4,000ft (1,219m). Minor carburetor adjustment may be required to compensate for differences in fuel, tempreature, altitude, and load.
The carburetor has two adjustment screws. Adjustments may be made through the carburetor access hole in the upper cowling.
With the engine turned off, remove carburetor access cap.
Turn the front screw (Figure 5, H) in, clockwise, until it seats lightly; then, turn screw out, counterclockwise, 1⅛ to 1¼ turns.
Turn the rear screw (Figure 5, L) in, clockwise, until it seats lightly; then, turn screw out, counterclockwise, 1¼ to 1¾ turns.
Turn the front screw (Figure 5, H) in, clockwise, until it seats lightly; then, turn screw out, counterclockwise, ⅞ to 1; turn.
Turn the rear screw (Figure 5, L) in, clockwise, until it seats lightly; then, turn screw out, counterclockwise, 1¼ turns.
For final adjustments, start engine and allow it to warm up, then operate at full throttle (Fast position).
Turn front screw (Figure 5, H) out slowly (counter clockwis) until engine loses speed, then turn screw in slowly (clockwise) until speed increases.
Final setting should not be less than one full turn out from seated position for low altitude adjustment and not less than ⅞ turn out for high altitude adjustment.
After carburetor has been adjusted, replace the access cap.
A properly installed Power Burst control will remain engaged and not pop back when pushed in.
If the Power Burst control needs adjustment, proceed as follows:
The idler pulley proveds continuous tension on impeller belt; therefore, no belt adjustment is necessary.
Remove, inspect, and reset spark plug gap at 0.030" (.76mm) every 100 hours of operation or prior to each season. If spark plug fouls or shorts out, replace it. Replace with Jacobsen Part No. 545581 or Champion UJ-12.
Reassembling Spark Plug Terminal and Cover
Choke Control Cable
If you have metal conduit, lubricate control cable as necessary, with #30 oil. Apply with a saturated rag or an oil can along the outer surface of the conduit. The oil will penetrate the conduit and lubricate the wire.
If you have a plastic conduit choke wire, do not oil.
Drain fuel tank with syphon or suction pump. Fuel tank may also be drained by tipping unit on its side and pouring fuel into container. Run engine until it stops ato remove all fuel. Pull cohke out and, again, pull starter handle several times.
Gum deposits could make it difficult to start the engine and cause expensive repairs when the machine is put back into operation.
Approximately 30 days from the day it is refined, gasoline will begine to deteriorate. The older gasoline becomes, the higher the gum deposits will be and the lower the octane rating. High gum deposits and low octane rating will cause hard starting and excessive carbon deposits in the engine. For this reason it is wise to run an engine out of fuel at the end of each seanon's use.
This fact holds true, particularly in the case of snow removal equipment. Using old gasoline that was refined in the summer months may also cause starting problems. This is due to the fact that fuel refined during the summer months is climatized for warm weather and should not be used during cold weather periods. The opposite holds true for fuel refined in the winter months. Engines that must operate in cold weather are generally more difficult to start because fuels and lubricants become stiffer in cold weather.
Remove the spark plug and pour 2 tablespoons (30ml) of oil into the cylinder. Crank engine slowly twice to spread oil inside of engine. Replace spark plug.
Tighten any loose screws or nuts.
Place discharge in FORWARD position to prevent deflector vanes from taking a set during storage.
Snow thrower may be hung on garage wall for convenient storage. Use upper handle to hang unit.
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