Introduction

The Yardmax Two-Stage Snow Blower YB6770 is a powerful and efficient machine designed to tackle heavy snowfall with ease. Featuring a 26-inch clearing width and a robust 208cc engine, it can handle snow depths of over a foot. The snow blower includes convenient features such as a dashboard with a headlight, heated hand grips, and a self-propelled drive with multiple speed settings. Priced at approximately $649, it combines performance and user comfort for effective snow removal.

UNPACKING THE CONTAINER

Use scissors or a knife to cut all the straps. Lift off the carton and dispose of properly. (See Fisure 1)

CONTENTS SUPPLIED

Your YARDMAX snow blower comes partially assembled and contains the following:

1. Main Machine
2. Discharge Chute
3. Chute Crank Flange
4. Lower Handle
5. Handlebars
6. Shift Arm
7. Skid Shoes
8. Shift Rod
9. Directional Chute Control
10. Operator's Manual & Engine Manual
11. Tools for Spark Plug Assembly
12. Engine Oil
13. Plastic Skid Shoes (Optional)
14. Drift Cutters (Optional)
15. Hardware Kit, Including:

Specifications 

• Model Number: YB6770
• Clearing Width: 26"
• Engine: LCT
• Displacement: 208cc
• Start Type: Electric
• Auger Diameter: 12"
• Impeller Diameter: 12"
• Chute Control: Directional Chute Control
• Chute Type: Steel
• Intake Depth: 21"
• Speed: 13" x 4"
• Forward Speeds: 6
• Reverse Speeds: 2
• Control Dashboard: Included
• Headlight: Included
• Cup Holder: Included
• Heated Hand Grips: Included

Yardmax Two-Stage Snow Blower YB6770 PARTS DIAGRAM

MAIN MACHINE

HANDLEBARS

GEARBOX

PARTS LIST

OPTIONAL DRIFT CUTTERS

OPTIONAL SKID SHOES

Description

The Yardmax YB6770 features a two-stage design, which includes an auger and an impeller, ensuring efficient snow removal. The auger breaks down the snow, and the impeller propels it through the discharge chute. The snow blower is equipped with a robust steel auger and a high-capacity impeller, allowing it to handle deep snow with ease. Additionally, it comes with adjustable chute control and a variable speed transmission, providing users with greater control over their snow-clearing tasks.

ASSEMBLY

This snow blower was partially assembled at the factory. To assemble your machine follow the below instructions.

HANDLEBARS

1. Unscrew the cable nut, slide the cable into the cable holder and tighten the nut. Loosen the two bolts on the sides of the transmission housing.
2. Slide the lower handle slots in-between the transmission and the washer. Finger tighten the bolts to hold the handle in place.

3. Align the holes in the lower handle with the upper holes on both sides of the transmission housing. Insert the bolts and curved washers and finger tighten to hold in place. (See Figure 2a)

   

4. Keep the lower handle level and tighten two bolts from the previous steps.

5. Raise the upper handlebars into operation position and slide the three bolts and washers through the two holes on the right side of the handlebar and the left lower hole. Secure them by finger tightening the nuts. Leave the upper hole on the left hand side without a bolt. This will be used to secure the directional chute control assembly later. (See Figure 2b)

   

6. Ensure the handlebars are level and tighten all three nuts. 

SKID SHOES 

1. Place the machine is on a level and solid surface.
2. Lift the machine so that the scrapper blade is 1/8" (3mm) above the ground, ensuring it is level. A piece of cardboard half the thickness of the snow blower packaging placed under the scrapper blade is recommended.

3. Attach the skid shoes to the sides of auger housing with the bolts and nuts. The shorter M8X20 bolts should be in the front holes while the longer M8X25 bolts in the rear holes. Move the skid shoes down as far as possible. Be sure both skid shoes are adjusted evenly. Tighten securely. (See Figure 3)

   

4. Remove the 1/8" (3mm) spacer you used from under the scrapper blade.

DISCHARGE CHUTE 

1. Sit the chute crank flange on top of the impeller housing. 
   Make sure the stop triangle points forward so that the notched edge is on the left side and the pre-greased surface is on the bottom. (See Figure 4a)

   

2. Place the discharge chute facing it forward over the chute crank flange. (See Figure 4b)

   

3. Secure the three flange keepers to the bottom of the chute crank flange by sliding the bolts through the chute base holes, sliding the keepers up from the bottom, then securing them with the included nuts. (See Figure 4c)

   

DIRECTIONAL CHUTE CONTROL

1. Slide the spiral end of the directional chute control lever into the chute bracket.
2. Attach the directional chute control lever to the handlebar through the upper hole on the left handle by sliding the bolt thru the hole. Use the curved washer and nut to secure it to the handlebar. Leave it finger tight for easier alignment later.

3. Secure the spiral end on the chute bracket by sliding on the flat washer and clevis pin. (See Figure 5a)

   

4. Make sure the spiral at the bottom is fully engaging with the chute crank flange and tighten the two bolts on the chute bracket. (See Figure  5b)

   

5. Tighten the nut which secures the directional chute control on the handlebar.

SPEED SHIFT LINKAGE

1. Place the shift arm on shift yoke. Make sure the linkage plate points to the right. Line up the holes in the shift arm and shift yoke. Insert a roll pin through the hole. (See Figure 6a)

   

2. Insert the shift rod with a flat washer into the shift arm. Secure with the other flat washer and clevis pin. (See Figure 6b)

   

3. Lift up the shift rod. Insert the trunnion into the shift rod hole on the bottom of the shift lever under the dashboard. Install the washer and MB nut. Tighten securely. (See Figure 6c)

   

HEADLIGHT WIRE CONNECTION

To connect the headlight harness cut the zip tie holding the wire off the engine, plug into the wire clip connected to the LED light, use zip ties inside the manual bag to secure it to the handlebar to avoid it being snagged during use. Cut excess strip off the zip ties when secure. (See Figure 7)

TIRES

The tires are over-inflated at factory for shipping purposes. Check the pressure in the tires prior to usage. Reduce or increase air pressure to ensure equal tire pressure to the manufacturer's recommended pressure. The recommended air pressure can be found on the tire sidewall.

WARNING: Under any circumstance do not exceed manufacturer's recommended pressure. Excessive pressure when seating beads may cause tire/rim assembly to burst with force sufficient to cause serious injury. Refer to side wall of tire for recommended pressure.

WARNING: Equal tire pressure should be maintained at all times. If the tire pressure is not equal in both tires, the machine may not travel in a straight path and the scraper blade may wear unevenly.

WARNING: Keep tires free of gasoline and oil, which can harm rubber.

KNOW YOUR MACHINE

FEATURES AND CONTROLS

SPEED SHIFT LEVER 

1. The speed shift lever has 8 positions: 6 forward speeds and 2 reverse. To change speeds, move the speed shift lever to the desired position. The lever locks in a notch at each speed selection.
   WARNING: Always release the drive dutch lever before changing speeds. Failure to do so will result in damage to the snowblower.
2. For easier snow removal, we recommend slower speeds when removing heavier snow. Faster speeds are better for when removing lighter snow and transporting the snow blower. It is recommended that you use a slower speed until you are familiar with the operation of the snow blower.
   WARNING: If the engine slows down under a load or the wheels Lil slip, shift the machine into a lower gear.
   WARNING: If the front of the machine rides up, shift the machine into a lower gear. If the front continues to ride up, Iit up on the handles.

DIRECTIONAL CHUTE CONTROL

Rotate the directional chute control clockwise to move the discharge chute to the left; counterclockwise to move the chute to the right.

CHUTE DEFLECTOR

To adjust the placement and angle of the snow discharge loosen the wingnut on the side of the deflector chute, move the  handle forward to place the snow low andnear the machine, pull the handle back to throw the snow further up and away from the machine. Retighten the wingnut to ensure the deflector remains where you would like it.

DRIVE CLUTCH LEVER

Squeeze the clutch lever against the handgrip to engage the transmission. Release to disengage.

WARNING: Always release the drive dutch lever before changing speeds. Failure to do so will result in damage to the snowblower.

AUGER CLUTCH LEVER

1. Squeeze the clutch lever against the handgrip to engage the auger and start snow blowing. Release to disengage.
2. When both auger clutch lever and drive clutch lever are engaged, the drive clutch  lever will lock the auger clutch lever inthe engaged position. This allows you to release your left hand from the handle and adjust the discharge chute direction without interrupting the snow blowing process.

SCRAPER BLADE &SKID SHOES

• The scraper blade allows better contact with the surface being cleared. It also prevents damage to the housing from normal use.
• The skid shoes are located on each side of the auger housing and control the distance between the scraper blade and the ground. Adjust skid shoes equally to keep the scraper blade level with the ground.
• The scraper blade & skid shoes are subject to wear and damage. Both scraper blade and skid shoes are adjustable to compensate for wear. They should be checked and adjusted periodically. Replace when necessary.
• Both scraper blade and skid shoes have two wear edges. When one side wears out, they can be rotated 180° to use the other edge.

WARNING: Damage to auger housing will result if scraper blade Lil wears down too far.

SHEAR PINS

The augers are secured to the auger shaft with shear pins and clevis pins. If the auger should strike a foreign object or ice jam, the snow blower is designed so that the pins may shear, preventing damage to any other components. If augers will not turn, check to see if the pins have sheared. Replace the shear pins if necessary.

WARNING: Do not substitute. Use only original equipment shear pins as supplied with your snow blower.

AUGER 

When engaged, the augers rotate and pull snow into the auger housing.

DISCHARGE CHUTE 

Snow drawn into the auger housing is discharged out the discharge chute.

CHUTE CLEAN-OUT TOOL 

WARNING: Never use your hands to clear a clogged discharge chute . Shut off engine and remain behind handles until all moving parts have stopped before unclogging.

The chute clean-out tool is conveniently fastened to the rear of the auger housing with a mounting clip. Should snow and ice become lodged in the discharge chute during operation, proceed as follows to safely clean the discharge chute and chute opening:

1. Release the auger clutch lever and shut off the engine.
2. Remove the clean-out tool from the clip which secures it to the rear of the auger housing.
3. Grasp the tool firmly by the handle and push and twist the tool into the discharge chute to dislodge the blockage.
4. Refasten the clean-out tool to the mounting clip on the rear of the auger housing.
5. Make sure the discharge chute is pointed in a safe direction (no vehicles, buildings, people, or other objects are in the direction of discharge). Restart the engine. While standing in the operator's position (behind the snow blower), engage the auger control for a few seconds to clear any remaining snow and ice from the auger housing and the discharge chute.

HEADLIGHT

The headlight provides added safety in low-visibility conditions. Turn the headlight switch to the ON position to activate.

HEATED GRIPS

To activate the heated grips, move the switch into ON position.

WARNING: It is recommended that you wear gloves when using the heated grip. If the heated grip becomes too hot, turn it off.

FUEL SHUTOFF VALVE

Always operate the snow blower with the fuel shut-off valve in the OPEN position. Close the valve when you do not use the machine.

CHOKE CONTROL

The choke control is used to choke the carburetor and assist in starting the engine. The choke control switches between the CHOKE CLOSED and CHOKE OPEN I I positions.

WARNING: Never use choke to stop engine.

PRIMER
Press the primer to pump additional fuel from the carburetor to the cylinder for improved cold weather starting.
RECOIL STARTER HANDLE
The handle is used to start the engine.
SAFETY IGNITION SWITCH
Insert the safety ignition key for engine to start and run. To stop the engine, remove the key.
RUN/STOP SWITCH
Used to stop the engine. Move switch to STOP position to stop engine. Place switch in RUN position for engine to start and run.
ELECTRIC STARTER & START BUTTON
The electric starter will start a properly choked and primed engine when start button (120V AC) is pushed. To start the machine, connect the electric starter to an electric power source with an approved extension cord and press the start button.

WARNING

1. Thoroughly inspect the electrical cord before using the machine. If the cord is damaged, do not operate the machine. Replace or repair the damaged cord immediately.
2. Connect extension cord to the electric starter plug-in frrst and then to a power outlet; disconnect the extension cord from the power outlet frrst and then from the machine.
3. To prevent damaging the electric starter, do not run it more than 5 continuous seconds each time you try to start. Wait 10 seconds between each attempt.

ADJUSTMENT

SKID SHOES 

1. Position the skid shoes based on surface conditions. For removal of snow in normal conditions, such as a paved driveway or sidewalk, place skid shoes in the higher position to give a 1/8" (3mm) clearance between the scraper blade and the ground. Use a middle or lower position when the area to be cleared is uneven.
   WARNING: It is not recommended to operate the snow blower on gravel as it can easily pick up and throw by the impeller, causing personal injury or damage to the snow thrower ond surrounding property.

2. If you choose to operate the snow thrower on a gravel surface, use extra caution and keep the skid shoes in position for maximum clearance between the ground and the scraper blade.
   WARNING: Always adjust skid shoes after adjusting scraper blade to prevent premature wear to scraper blade or damage to auger housing.

   

To adjust the skid shoes:

1. Loosen the four hex nuts (two on each side) and carriage bolts. Move skid shoes to desired position.
2. Make sure the entire bottom surface of skid shoe is against the ground to avoid uneven wear on the skid shoes.
3. Retighten nuts and bolts securely.

AUGER CLUTCH AND DRIVE CLUTCH

• When a uger clutch lever or drive clutch lever is released and in the disengaged position, the cable shou Id have very little slack.
• Auger must stop within 5 seconds when the auger clutch lever is released. If auger clutch does not engage or disengage properly, adjust auger dutch before operation.
• If the snow blower's drive is disengaging intermittently during operation, or it drives when you release the drive clutch lever, adjust the drive clutch before operation.
• Both auger clutch and drive clutch can be adjusted at either end of their control cables.

1. Loosen adjusting nuts on cable support bracket
2. Slide the control cable up or down by threading adjusting nuts to increase cable tension or provide more slack.
3. Tighten nuts after proper adjustment is achieved ..

CHUTE BRACKET 

If the spiral at the bottom of the directional chute control lever is not fully engaging with the chute assembly, the chute bracket must be adjusted.

To do so:

1. Loose the two nuts which secure the chute bracket and reposition it slightly.
2. Retighten the nuts.

PLASTIC SKID SHOES(OPTIONAL)

Optional reversible poly skid shoes protect decorative surface.

DRIFT CUTTERS (OPTIONAL)

Drift cutters break up snow drifts that are taller than the auger housing and direct the snow into the auger. Store the drift cutters on the auger housing when not in use. Reposition drift cutters so they face forward as shown. Wing nuts should be fastened on the outside of the auger housing.

OPERATION

FREEWHEELING AND SELF-PROPELLING

• Left wheel equipped with the axle lock pin can be completely released by removing the pin and installing it in the outer axle hole. Unlock the left wheel to allow for easier turning of the unit. 
  To unlock the left wheel, remove the pin from the inner hole and insert the axle pin through the outer axle hole, but not through the wheel hub.

  

• To lock the left wheel, insert the pin through the wheel hub and the inner axle hole.

  

STARTING AND STOPPING THE ENGINE 

WARNING: Before starting the engine, check engine oil level and ensure the engine is served as described in the Engine Manual with the snow blower.

COLD START ELECTRIC STARTER (120V AC) 
The engine is equipped with 120V A.C. electric starter and a recoil starter. The electric starter is equipped with a three-wire power cord and plug and is designed to operate at the voltage shown in the label.

WARNING: Do not use the electric starter if your household voltage different from the one shown on the electric starter.

1. Insert safety ignition key into ignition slot until it clicks. Do not turn the key.
2. Be sure fuel shutoff valve is in the OPEN position.
3. Move choke control to CLOSED position.
4. Push the primer 2 or 3 times. When temperature is below 15°F (-25°C), additional priming may be needed. When temperature is above S0°F (10°C), priming is not necessary.
   Over priming may cause flooding, preventing the engine from starting. If you do flood the engine, wait a few minutes before attempting to start and do not push the primer. 
   Some snow engine are not equipped with primer as priming is not needed.
5. Connect the extension cord to the engine.
6. Plug the other end of the extension cord into a three-wire grounded receptacle.
7. Push starter button until engine starts.
   WARNING: To prevent damaging the electric GB starter, do not run it more than 5 continuous seconds each time you try to start. Wait 10 seconds between each attempt.
8. When the engine starts, release the starter button and slowly move the choke control to the OPEN I VI position.
9. Disconnect the extension cord from thereceptacle first, then from the engine.

CO LD START - RECOIL STARTER 

1. Be sure fuel shutoff valve is in the OPEN position.
2. Place RUN / STOP switch in RUN position.
3. Rotate choke control to CLOSED position.
4. Push the primer 2 or 3 times. When temperature is below 15°F (-25°C), additional priming may be needed. When temperature is above S0°F (10°C), priming is not necessary.
   WARNING: Over priming may cause flooding, preventing the engine from starting. If you do flood the engine, wait a few minutes before attempting to start and do not push the primer.
5. Grasp recoil starter handle and pull rope out slowly until it pulls harder. Let rope rewind slowly.
6. Pull rope with a rapid continuous full arm stroke. Do not allow starter rope to snap back.
7. Repeat steps 5 and 6 until engine starts.
8. When the engine starts, release the recoil starter handle and slowly move the choke control to the OPEN I I position.

WARM START 
Follow the steps above, keeping the choke control in the OPEN I I position and do not use primer.

Allow the engine to warm up for a few minutes, engine will not develop full power until it has reached normal operating temperature. 
In snowy and cold conditions, some controls and  moving parts may freeze. Do not use excessive force when trying to operate frozen controls. If you have  difficulty operating any control or part, start the engine and let is run for a few minutes. 

SNOW BLOWING TIPS 
It is easier and more efficient to remove snow immediately after it falls.

• The best time to remove snow is the early morning. At this time the snow is usually dry and has not been exposed to the direct sun and warming temperatures.
• Slightly overlap each successive path to ensure all snow will be removed.
• For large areas, start in the middle and throw snow to each side, so snow is not cleared more than once.
• For extremely heavy snow, reduce the width of snow removal by overlapping previous path and moving slowly.
• Throw snow downwind whenever possible.
• Keep engine clean and clear of snow during use. This will help air flow and extend engine life.
• After snow-throwing is completed, let the engine run for a few minutes to help dry off the moisture on the engine and prevent moving parts from freezing. Engage the auger/impeller to clear any remaining snow from inside the housing. Rotate the discharge chute to prevent it from freezing. Stop the engine, wait for all moving parts to stop, and remove all ice and snow from the snow thrower. With the engine off, pull the recoil starter handle several times to prevent the recoil starter from freezing up.

TRAVE LING 
To travel from one work area to another:

1. Set the throttle to slow or part-throttle position.
2. Press down on the handlebars enough to raise front of the unit slightly off surface.
3. Engage the drive clutch without engaging auger clutch.

TRANSPORT 

WARNING: Always shut off the engine, remove key, and dose fuel shut­off valve when transporting unit on a truck or trailer. Do not transport machine while engine is running.

• Use extra care when loading or unloading the unit onto a trailer or truck.
• Secure unit chassis to transport vehicle. Never secure from rods or linkages that could be damaged.

Setup Guide

To set up and operate the Yardmax YB6770, 

1. Start by unpacking and assembling the components according to the provided instructions. 
2. Ensure all parts are securely attached before starting. Fill the gas tank with the recommended type of fuel, and check the oil level. 
3. Start the engine, allow it to warm up for a few seconds, and adjust the chute direction and speed settings as needed. 
4. Always follow safety guidelines and maintain a safe distance from obstacles while operating the snow blower.

MAINTENANCE

LUBRICATION

AUGER GEARBOX of Yardmax Two-Stage Snow Blower YB6770

The gearbox was filled with lubricant to the proper level at the factory. Unless there is evidence of leakage or service has been performed on the gearbox, no additional lubricant should be required. If lubricant is required, use GL-5 or GL-6, SAEBS-95, EP gear oil lubricant. Do not use synthetic oil.

GENERAL LUBRICATION
Lightly lubricate all moving parts of the machine at the end of the season or every 25 operating hours.

WARNING: Do not allow grease or oil get on the friction disc, friction plate or belts. Do not excessively oil the machine; extra oil may enter the traction drive and cause the traction drive belt to slip.

• When lubricating auger shaft, remove shear pins to apply oil inside the shaft and around spacers and flange bearings found at either end of the shaft.
• Remove the wheels to apply grease the wheel shaft.

Troubleshooting

Yardmax YB6770 Pros & Cons

Pros

• High Performance: Powerful 208cc OHV engine for efficient snow removal.
• Large Clearing Capacity: Clears 26 inches wide and up to 12 inches deep.
• Adjustable Chute Control: 180-degree chute rotation for precise snow placement.
• Variable Speed Transmission: 6 forward and 2 reverse speeds for better control.

Cons

• Weight and Size: Heavy and bulky, requiring significant storage space.
• Noisy Operation: Can be loud during operation due to its powerful engine.
• Maintenance Requirements: Regular maintenance is necessary to ensure optimal performance.

Customer Reviews

Customers have praised the Yardmax YB6770 for its robust performance, ease of use, and value for money. Many reviewers have noted its ability to handle deep snow with ease and its durability over multiple seasons. However, some users have mentioned that it can be heavy and difficult to maneuver for those with limited strength. Common complaints include the need for regular maintenance and some issues with starting the engine after extended periods of inactivity.