Avantco MX20 Gear Driven 20 Qt. Commercial Mixer

Product Overview

This document is the user manual for the Avantco MX20 Gear Driven 20 Qt. Commercial Mixer. It provides essential instructions for safe operation and maintenance. Key information includes the model number (MX20), capacity (20 Qt.), and a critical warning: "Shifting gears while this unit is running will void warranty." The manual is intended for indoor use only. The document was last updated 02/2022. The manufacturer's website is www.AvantcoEquipment.com.

Parts Overview

The Parts Overview section identifies key external components of the Avantco MX20 Commercial Mixer. The diagram illustrates the mixer's main parts, including the cover, rear cover, safety guard, mixing device, bowl lift wheel, bowl, power switch, and speed control.

Important Notes:

• Do not hose down the mixer.
• Do not operate the mixer with wet hands.
• Unplug the mixer from the electrical supply prior to any maintenance or repairs.

Standard Accessories

The Avantco MX20 mixer comes with standard accessories for various mixing tasks. These include a Flat Beater, Dough Hook, Whisk, and a Bowl. The manual provides instructions on how to install and remove these agitators by raising them onto the mixing axle and rotating them clockwise to lock, and counter-clockwise to remove. All accessories are designed for easy fitting and cleaning.

Operation Instructions

Before operating the mixer, ensure that the power supply matches the machine's requirements (e.g., 110V, NEMA 5-15P plug). For changing speeds, it is crucial to stop the machine first to prevent damage to the gearbox. Ensure the bowl is fully lifted and the guard is closed before adjusting speed.

Speed settings are indicated by the knob position:

• Slow Speed: Knob facing forward (typically for Dough Hook).
• Medium Speed: Knob facing straight down (typically for Flat Beater).
• High Speed: Knob facing straight up (typically for Whisk).

Always use the correct attachment for the specific mixing job:

• Whisk: Suitable for liquids and soft ingredients; can be used at all speeds. Maximum continuous operation: 15 minutes.
• Flat Beater: Suitable for dry ingredients; use only at low and medium speeds. Maximum continuous operation: 15 minutes.
• Dough Hook: Suitable for mixing dough; use only at low and medium speeds. Maximum continuous operation: 20 minutes. Requires an absorption ratio of more than 50%. Refer to the mixer capacity chart for details.

Mixer Capacity Chart

This chart details the maximum bowl capacity for various products when using specific agitators and speeds. It also provides guidance on calculating dough absorption ratios (AR) and important notes regarding speed usage and measurements.

Important Notes on Mixing Dough:

• When mixing dough (pizza, bread, or bagels), check the "AR" absorption ratio (water weight divided by flour weight).
• Capacities are based on 12% flour moisture at 70°F water temperature. If high gluten flour is used, reduce batch size by 10%.
• Example calculation: 5 lb. water / 10 lb. flour = 0.50 x 100 = 50% AR.
• Second speed should not be used for mixtures with less than 50% AR.
• Do not use attachments on the hub while mixing.

Helpful Weights & Measures:

• 8.3 lb. = 1 gallon of water
• 2.08 lb. = 1 Quart.

Cleaning

WARNING: DISCONNECT THE MACHINE FROM THE POWER SOURCE BEFORE CLEANING.

All new mixer bowls and accessories (whips, beaters, dough hooks) should be washed before first use. Wash with hot water and a mild soap solution, rinse with a mild vinegar or soda solution, and then rinse again with clean water. This procedure is recommended before whipping egg whites or whole eggs. The mixer itself should be cleaned daily with a clean damp cloth.

If the unit has not been used for some time, follow the above cleaning procedure before use. It is important to grease the rear bowl lift guides every three months to prevent corrosion.

Troubleshooting

This section provides solutions for common issues encountered with the mixer.

Figure 1: Transmission Case

This figure illustrates the components of the transmission case. It includes various screws (M6*45, M5*8, M6*25), covers, bearings (6201, 6003), end cover, body, and rear cover. Notes advise ensuring proper lubrication of bearings before assembly and that the factory lubricant should be replaced by a technician if the mixer is repaired.

Figure 2: Planetary Shaft Assembly

This diagram details the components of the planetary shaft assembly. It includes parts such as baffles, rollers, springs, engagers, gear rings, dividing rings, joint gears, bearing rings, joints, rings, bearings (6205), oil seals, sleeves, axles, and keys. Notes emphasize correct installation position, lubrication of pins, smooth operation of the joint sleeve, and checking the oil seal for leaks.

Figure 3: Transmission Shaft Assembly

This figure displays the components of the transmission shaft. It lists bearings, transmission axles, various keys (5*11), gears, and stop rings. The notes highlight that the gear shaft and gear shaft I are located at the center of the shaft unit and that C-type stop rings must be fixed during reassembly, ensuring keys are inserted for each gear.

Figure 4: Worm Gear Shaft Assembly

This diagram illustrates the worm gear shaft assembly, featuring bearings (6201), a gear axle, a key (5*14), a gear, and a stop ring. A note specifies that the C-Type stop ring must be fixed during reassembly.

Figure 5: Motor Unit

This section details the motor unit components, including stop rings, worm gears, oil seals, bearings (6203), keys (4*22), axles, rotors, governors, governor plates, bearing covers, and fans. The notes provide troubleshooting advice for motor failure, suggesting checks for power source, wiring, and potential issues like incorrect voltage or defective governors. It also clarifies that the motor set includes the axle, rotor, and stator.

Figure 6: Shifting Mechanism

This figure illustrates the speed selector or shifting mechanism, designed for simplicity and reliability with three mixing speeds. Components include axles, nuts, springs, shafts, forks, pins (3*20), eccentricity knots, steel balls, speed springs, and speed blocks. Important operational notes include applying sealant to the shift selector assembly during installation and stopping the mixer before changing speed. Speed selection is made by aligning a pointer on the shift handle to the desired action (e.g., Whisk for eggs, Paddle for batter, Hook for dough).

Figure 7: Stand & Bowl Lift Unit

This diagram shows the stand and bowl lift unit of the mixer. It lists components such as bowl supports, columns, slides, plates, gears, support seats, capacitor boards, capacitors (200uF), nuts (M10), springs, spirals, bowl lift supports, handwheels, handles, screws, machine seats, limit switches for the safety guard, fluctuate safety switches, overload protection switches, and AC contact devices. These parts collectively manage the raising and lowering of the bowl and safety interlocks.

Figure 8: Bowl Lift Unit

This figure details the bowl lift unit. Components include a lifting bar, cotton pins (3*30), nuts (M10), flat washers, compression springs, little knots, lifting handle brackets, flange knots, screws (M6*25), keys (5*20), and the bowl lift handle. These parts work together to operate the bowl lifting mechanism.

Figure 9: Planetary Assembly

This diagram illustrates the planetary assembly. It lists parts such as screws (M6*45, M8*15), turning plates, rings, nuts (M20*1.5), safety guards, inner gears, planetary gears, bearings (6203, 6204), oil seals (Pd25*50*10), keys (5*18), mixing axles, and pins. These components form the planetary drive system of the mixer.