Zenoah HB2311EZ Workshop Manual
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Zenoah HB2311EZ Workshop Manual

Zenoah handheld and backpack engine blowers
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Summary of Contents for Zenoah HB2311EZ

  • Page 3 The contents may be modified due to performance improvement or some other reason without notice. 2. Use Zenoah brand-name parts when replacing a part during maintenance, etc. The manufacturer does not bear any responsibility if trouble occurs during parts use of other than brand-name parts.
  • Page 4 Exported models according to country This workshop manual applies to all exported engine blower models sold by Hasqvarna Zenoah. Some models are not exported to particular regions of the world. Please check your model by referring the following table. Table of exported models corresponding to country...
  • Page 5 Model Notation The engine type and blower model nomenclature is as follows. The applicable blower models and series names are indicated at right of the maintenance item title. Refer to this nomenclature to confirm engine type and blower model. ● ● ● ● Engine Type G Z 25 N Engine series (L/ N/ K) Displacement (cm...

  • Page 6: Table Of Contents

    Contents 1. Special Features ......................1 2. Specifications and Technical Data 2-1 Blower ........................... 2 2-2 Pipe ..........................3 2-3 Overall dimensions ......................4 3. Special Tools 3-1 Rotor Removal ......................5 3-2 Module Assembly ......................11 3-3 Recoil Pulley Removal ....................14 3-4 Piston Pin Removal .....................
  • Page 7 5. Structure of Right Hand Throttle Lever ............. 40 6. Carburetor 6-1 Specifications ......................41 6-2 Carburetor Configuration .................... 42 6-3 Carburetor Conforms to Exhaust Emissions Regulations .......... 43 6-4 Limiter Cap Removal/ Installation ................44 6-5 Idling Speed Adjustment ..................... 44 6-6 Carburetor Inspection ....................

  • Page 9: Special Features

    1. Special Features Pipe End Specifications and Characteristics Operating area Pipe End φ φ φ φ 57 mm (2.24 in.) Pipe End φ φ φ φ 72 mm (2.84 in.)/ φ φ φ φ 66 mm (2.60in.) Engine Centrifugal Fan Backpack Pad Ventilation The environmental friendly Strato The fan is designed to deliver air...

  • Page 10: Specifications And Technical Data

    Engine lubrication Oil － 2-cycle oil ← ← ← ← ← ← ← ← ← ← ← ← ← Zenoah FC 40:1 Mixing Ratio － Normal FB 25:1 ← ← ← ← ← ← ← ← ← ← ← ←...

  • Page 11: Pipe

    (Standard) (Option) (Option) (Option) Solid Color 848-L0L-65E0 (Standard) 848-L38-65E0 (Option) 848-L5K-65E1 (Standard) 848-L5Z-65E0 (Standard) EB430/ ● ● EBE440 +(2750-51200 Swivel Joint) HB2302/ HB2311EZ/ ● ● ● (Option) ● HBZ2601 EBZ3000 ● ● (Option) ● EB4300/ EB6200/ ● ● ● (Option) ●...

  • Page 12: Overall Dimensions

    2. Specifications and Technical Data 2-3 Overall dimensions Handheld Blower Unit: mm (in.) Blower Type HB2302 325 (12.8) 225 (8.86) 360 (14.2) 610 (24.0) HB2311EZ 325 (12.8) 233 (9.17) 360 (14.2) 610 (24.0) HBZ2601 268 (10.55) 327 (12.9) 360 (14.2) 610 (24.0) HBZ2601 (USA) 269 (10.59)

  • Page 13: Special Tools

    3. Special Tools 3-1 Rotor Removal Description Part Name Stopper Stopper Stopper Puller Assy Puller Assy Puller Assy Wrench (HEX) Part Number 2670-96220 3350-96220 4810-96220 2890-96100 1490-96101 2750-96100 3304-97611 Size: 3/4/5 mm Wrench (TORX) 1664-96410 2850-96410 Model Size: T20/ T25/ T27 HB23 Series ●...
  • Page 14 3. SPECIAL TOOLS Handheld Blower: HB23 Series, HBZ26 Series 2. Set the stopper (special tool) into the plug hole. 【 【 【 【 HB23 Series】 】 】 】 【 【 【 【 HBZ26 Series】 】 】 】 Stopper Stopper 3. Remove the mounting nut using the box wrench Washer then remove the fan.
  • Page 15 3. Special Tools Handheld Blower: HB23 Series, HBZ26 Series 6. Remove the rotor using the puller assy. Puller Bolt (8 mm) 17 mm Apply 8 mm puller bolts. Puller Assy Rotor How to use (Procedure) Backpack Blower: EBZ30 Series Construction Refer to Clip (4) “4-3 Upper Spring Damper Removal”...
  • Page 16 3. SPECIAL TOOLS Backpack Blower: EBZ30 Series 2. Set the stopper (special tool) into the plug hole. Stopper 3. Remove the four mounting screws, then remove the fan. Mounting Bolt TORX (T27): M6×L30 4. Remove the four mounting screws, separate the Mounting Bolt volute case and the engine short block.
  • Page 17 3. Special Tools Backpack Blower: EBZ30 Series 5. Remove the mounting nut using the box wrench. Box Wrench (12 mm) 6. Remove the rotor using the puller assy. Apply 8 mm puller bolts. Mounting Nut (12 mm Hex) Puller Assy. Puller Bolt (8 mm) Rotor How to use (Procedure)
  • Page 18 3. SPECIAL TOOLS Backpack Blower: EB4300/ 6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series 2. Set the stopper (special tool) into the plug hole. Stopper 3. Remove the four mount screws, then remove the Mounting fan. The fan is detached but stays inside the volute Bolt cover assembly and the volute case.

  • Page 19: Module Assembly

    3. Special Tools 3-2 Module Assembly Description Part Name Gauge Gauge Gauge Wrench (HEX) 3304-97611 Part Number 3350-96240 2750-96240 848-8W4-0050 Size: 3/ 4/ 5 mm T=0.4 mm t=0.3 mm t=0.4 mm Wrench (TORX) 2850-96410 Model Size: T20/ T25/ T27 HB23 Series HBZ26 Series ●...
  • Page 20 3. SPECIAL TOOLS Examples of the gauge (special tool) usages are shown according to the type of the gauge. Gauge: 3350-96240 (T=0.4 mm) HB23 Series, HBZ26 Series, EBZ30 Series 1. Remove the obstructive parts in order to see the 【 【 【 【 HB23 Series】 】 】 】 rotor and the module.
  • Page 21 3. Special Tools Gauge: 2750-96240 (T=0.3 mm) EB4300/ 6200, EB70 Series, EBZ4800/ 5100Q 1. Remove the module cover. 【 【 【 【 EB4300/ 6200, EB70 Series】 】 】 】 2. Insert a gauge (special tool) between the rotor Gauge Wrench magnet metal and module.

  • Page 22: Recoil Pulley Removal

    3. SPECIAL TOOLS 3-3 Recoil Pulley Removal Description Part Name Stopper Puller Puller Wrench (HEX) 3304-97611 Part Number 4810-96220 4500-96100 848-8W0-0020 Size: 3/ 4/ 5 mm Wrench (TORX) 2850-96410 Model Size: T20/ T25/ T27 HBZ26 Series ● ● ● EBZ71/ 80 Series ●...

  • Page 23: Piston Pin Removal

    3. Special Tools 3-4 Piston Pin Removal Description Part Name Rod Assy Rod Assy Rod Assy Wrench (HEX) 3304-97611 Part Number 1101-96220 3350-96230 2750-96230 Size: 3/ 4/ 5 mm φ11×35 mm φ7.5×φ4.7 φ11×φ8 Wrench (TORX) 2850-96410 Model Size: T20/ T25/ T27 HB23 Series ●...
  • Page 24 3. SPECIAL TOOLS Rod Assy: 3350-96230 EBZ30 Series, EB4300, EBZ4800, EBZ51 Series 1. Remove the engine short block (refer to “3-1 Rotor Piston Rod assy. Removal”) and then remove the cylinder. 2. Remove the snap rings from both sides of the piston pin.

  • Page 25: Service Guide

    4. Service Guide 4-1 Starter Pulley Removal HB23 Series, EBZ30 Series ● Insert the stopper (special tool) into the plug hole (refer to “3 Special Tool”) to secure the piston. Pliers ● Remove the starter pulley using commercially available pliers. The pulley must be covered with cloth to prevent from damage.

  • Page 26: Upper Spring Damper Removal

    4. Service Guide 4-3 Upper Spring Damper Removal EBZ30 Series To remove the upper spring damper, follow the procedure below. 1. Remove the three mounting screws. 2. Pull the plate upward from the spring holder’s Plate groove. Mounting Screw TORX (T27): M5×L25 Spring Holder 3.

  • Page 27: Volute Cover Lower Damper Removal

    4. Service Guide 4-4 Volute Cover Lower Damper Removal EB6200, EB70 Series, EBZ4800, EBZ30/ 51/ 71 Series ● Remove the volute unit from the frame. Volute Cover Mounting Screw ● Remove the all mount mounting screws, separate volute cover from its case, then remove the lower damper unit.

  • Page 28: Crankcase Oil Seal And Bearings Removal

    4. Service Guide 4-6 Crankcase Oil Seal and Bearings Removal All Models ● Disassembly is usually unnecessary. However, if 【 【 【 【 Fan Side】 】 】 】 Press the oil seal’s main lip or dust lip is worn, the shaft will become loose due to bearing wear or if the they have seized, replace the oil seal and bearings with new ones.

  • Page 29: Crankcase Assembling

    4. Service Guide 4-7 Crankcase Assembling Bearings, snap ring, oil seal configuration and installation position differ depending on type. Properly install each part and reassemble the crankcase referring to the corresponding type’s drawing. For bearing and oil seal installation, refer to the explanation on page 23. HB23 Series, HBZ26 Series Construction Snap Ring...
  • Page 30 4. Service Guide EBZ4800, EBZ51 Series Construction Lubrication Hole Lubrication Hole Bearing Snap Ring Push the bearings until they Do not cover the contact the crankcase. lubrication hole with the snap ring. 【 【 【 【 Starter Side】 】 】 】 【...
  • Page 31 4. Service Guide Oil Seal Assembly All Models ● Never insert the oil seal obliquely. The oil seal may be fall out. Press ● Before the oil seal is pressure-inserted, apply grease to the oil seal. ● Press the oil seal from the outside of the crankcase using combined special tools (holder and guide).

  • Page 32: Piston Inserting Direction

    4. Service Guide 4-8 Piston Inserting Direction All Models Make sure to point the recessed mark (arrow or Arrow Mark Triangle Mark triangle) on the piston head to the exhaust (muffler) side. 【 【 【 【 Exhaust Side】 】 】 】 【...

  • Page 33: Positioning Of Lead Air Intake Tube

    4. Service Guide 4-10 Positioning of Lead Air Intake Tube HBZ26 Series The lead air intake tube has cast marking of either “F” or “S”. Marks “S” is for the starter end, and “F” for the fan end. Assembling position shall not be mixed up. CAUTION Caution: Oppositely assembled tubes will cause a sealing failure.

  • Page 34: Gasket Assembly

    4. Service Guide 4-12 Gasket Assembly All Models Each gasket has its installing direction. Pay attention Gasket Positions C, Muffler Gasket to the direction when the gasket is being installed. 【 【 【 【 Fan Side】 】 】 】 CAUTION When the engine is overhauled, replace the gaskets with new ones.

  • Page 35: Scavenging Duct Cover Assembly

    4. Service Guide 4-13 Scavenging Duct Cover Assembly EBZ30/ 71/ 80 Series The scavenging duct covers have marking either “S” for starter side or and “F” for fan side. Gasket They must not be oppositely assembled. CAUTION When the engine is overhauled, be sure to Gasket replace the gaskets with new ones.

  • Page 36: Switch Cord Assembly

    4. Service Guide 4-15 Switch Cord Assembly Switch Cord Assembly HB23 Series, HBZ26 Series ● Fit the switch cord connector firmly to the module’s 【 【 【 【 HB23 Series】 】 】 】 terminal. Switch Cord Module Connector ● Secure the switch cord terminal with the module 【...
  • Page 37 4. Service Guide Switch Cord Assembly EB4300/ 6200, EB70 Series ● Secure the switch cord terminal with the module Module mounting bolt. CAUTION Ensure the cord is not bent nor interfering with the crankcase when the module mount bolt is tightened. ●...

  • Page 38: Cable Wiring

    4. Service Guide 4-16 Cable Wiring Switch Cord Wiring HB23 Series, HBZ26 Series ● Insert the grommet to align with the volute case Cords notch and clamp the cord between the protrusions as shown in the figure at left. Grommet CAUTION Check that the cord on the module side is not caught between volute case and crankcase.

  • Page 39: Fan Assembly

    4. Service Guide 4-17 Fan Assembly All Models ● Insert the stopper (special tool) into the plug hole 【 【 【 【 HB23/ 26 Series】 】 】 】 (refer to “3 Special Tool”). ● Tighten the mounting nut so that the fan securely Mounting Bolt meets the rotor without looseness.

  • Page 40: Upper Damper Assembly

    4. Service Guide 4-20 Upper Damper Assembly EB4300/6200, EB70 Series, EBZ4800, EBZ51/ 71/ 80 Series Assemble the damper and volute cover by mating their protrusions. CAUTION Check that the damper is not tilted. Improper installation will result in rapid damage. Damper Protrusion Volute Cover Protrusion Volute Cover...

  • Page 41: Carburetor Assembly

    4. Service Guide 4-22 Carburetor Assembly EBZ71/ 80 Series Tighten the screws of the earth cord between the Carburetor carburetor's adjuster unit and the crankcase. CAUTION This cord prevents electrostatic sparks. Do not fail to connect it. Earth Cord 4-23 Engine Cover Assembly Check of the Gasket Assembly HB23 Series When the engine cover is installed, pay attention to...

  • Page 42: Check Of The Gasket Assembly

    4. Service Guide 4-24 Check of the Gasket Assembly EBZ4800, EBZ51/ 71/ 80 Series Check that the master and insulator gaskets are set 【 【 【 【 Intake Side】 】 】 】 【 【 【 【 Exhaust Side】 】 】 】 inside the cylinder plate before the engine cover is Insulator Gasket Muffler Gasket...

  • Page 43: Spark Arrester Removal

    4. Service Guide Husqvarna Zenoah engine blowers are equipped with spark arresters to prevent spark dispersion. CAUTION ・ ・ ・ ・ The Spark arrester prevents burnt carbon discharging from the muffler. Even though the spark arrester can easily clog with carbon, never operate the blower with the spark arrester detached.

  • Page 44: Spark Arrester Cleaning

    4. Service Guide EBZ51/ 71/ 80 Series 1. Remove the engine cover. Mounting Bolt (long) Muffler ×2 (Refer to “3. Special Tools”) 2. Remove the three mounting bolts and then remove the muffler. Torque: 7.8～11.8N・m (80～120kgf・cm) Mounting Bolt 3. Remove the four mounting bolts (torx) and then ×4 attach the diffuser (diffusing cover) and the spark arrester.

  • Page 45: Air Cleaner Inspection

    4. Service Guide 4-28 Air Cleaner Inspection This device blows fallen leaves to a collection point but at the same time small particles (dust and sand) become airborne. If such dust invades the engine, the engine mechanism will wear quickly. So periodically check and clean the element according to the following table.
  • Page 46 4. Service Guide Single layer half-wet urethane foam EB4300/ 6200 Loosen the knob then remove the element. Knob Screen Cover Screw Knob Element Dual layer half-wet urethane foam EBZ4800 Loosen the knobs then remove the elements. Screen Elements Yellow Black Knobs Packing Knobs...

  • Page 47: Element Cleaning

    4. Service Guide Two stage dry element (Pre-filter + Paper filter) EBZ80 Series Loosen the knob bolts then remove the element Knob Bolts (pre-filter + paper filter). Pre-filter Cover Case Paper Filter 4-30 Element Cleaning Element and pre-filter rinsing All Models ●...

  • Page 48: Structure Of Right Hand Throttle Lever

    5. Structure of Right Hand Throttle Lever ● The right hand throttle lever specifications (RH) employs a governor mechanism for easy blower operation with constant wind pressure. <Governor Mechanism> It is a mechanism where the throttle lever can be fixed by Light Handle a throttle lever lock at a chosen position.

  • Page 50: Carburetor

    6. Carburetor 6-1 Specifications Model Carburetor (Walbro) Carburetor Specifications Seal (L-needle) Adjustment angle Adjustment angle Venturi Bore Venturi Bore Metering Lever Valve Opening Valve Closing Blower Engine Type Part Choke Bore Sales Region (L-needle return (H-needle return Main Jet (Lead Air) (Mixture Air) Height Pressure...

  • Page 51: Carburetor Configuration

    6. Carburetor 6-2 Carburetor Configuration Inspection and adjustment items Execute the following check and adjustment if the carburetor does not function normally. (Refer to "6-5 Idling Speed Adjustment " and "6-6 Carburetor Inspection".) ● Fuel adjustment when idling ● Check of the body assembly ●...

  • Page 52: Carburetor Conforms To Exhaust Emissions Regulations

    6. Carburetor 6-3 Carburetor Conforms to Exhaust Emissions Regulations The carburetor flow rates of all Hasqvarna Zenoah engine blowers are individually pre-adjusted to pass exhaust emissions regulations. A limiter cap is installed in the idling limiter to prevent an operator carelessly changing the idle setting resulting in non-conformance with exhaust emission regulations.

  • Page 53: Limiter Cap Removal/ Installation

    6. Carburetor 6-4 Limiter Cap Removal/ Installation Tool The limiter cap tool (carburetor maintenance tool: Limiter cap tool extraction side Limiter Cap Tool Screw unit 848-8W9-0080) is used for limiter cap (M2 counterclockwise threading) installation/removal. Limiter cap insertion side Removal Insert the limiter cap tool extraction tool's threading Limiter cap tool extraction side Press it while turning it...

  • Page 54: Carburetor Inspection

    6. Carburetor High Speed Adjustment 【 【 【 【 USA/ HBZ2601 only】 】 】 】 High speed revolutions are adjusted by a H-needle. Increases Clockwise (CW): Fuel mixture becomes lean. (Speed increases.) Counterclockwise (CCW): Fuel mixture becomes rich. (Speed decreases.) H-needle Decreases 6-6 Carburetor Inspection...
  • Page 55 6. Carburetor b. Judgments of the main check valve ● As illustrated, hold a plastic pipe on the check valve and blow and suck air by your mouth. If the Plastic Pipe air is stopped by blowing, and open by sucking, the valve has no failure.

  • Page 56: Carburetor Adjustment

    ● The fuel filter must be clean and properly installed. ● The carburetor and carburetor insulator block screw must be tight. ● The fuel must be fresh (properly mixed at 40:1 ratio with Zenoah or 50:1 ratio with RedMax) ● All standard air tubes (Air Pipes) must be installed.
  • Page 57 6. Carburetor Adjustment if engine does not activate Set the adjustable parts as specified according to the following procedure. L-needle 1. Loosen the throttle valve adjust screw until the Throttle Valve throttle valve becomes completely free, then turn Adjust Screw the screw clockwise until the regulated angle is attained.
  • Page 58 6. Carburetor Rich Down Adjustment 1. Turn the idling limiter (L-needle) clockwise to the position of maximum engine speed. L-needle 2. Turn the throttle valve adjust screw in either Throttle Valve direction to match to the regulated ID peak speed. Adjust Screw (Refer to "6-1 Specifications- ID Peak Engine Speed".)
  • Page 59 6. Carburetor Confirmation after adjustment ● After adjustment is completed, be sure to install the new limiter cap. Dust Cover (Refer to "6-4 Limiter Cap Removal/ Installation".) ● Be sure to reattach the dust cover. CAUTION Limiter Cap If the engine is run while the throttle valve's dust cover is removed, dust or alien matter may adhere to the throttle valve's rear contoured or the plunger contacting...

  • Page 61: Maintenance Standards

    EBZ5100/ 5100RH/ EB6200 Instrument Procedure HB2302 EBZ3000/ 3000RH 5100Q EBZ7100/ 7100RH EBZ8001/ 8001RH Model HBZ2601 EB4300 EBZ4800 EB7000 HB2311EZ EBZ3050RH EBZ5150/ 5150RH/ EBZ7150/ 7150RH EBZ8050/ 8050RH Blower Model － － － － EB7001 5150Q Standard Limit Standard Limit Standard Limit...

  • Page 62: Tightening Torques

    EBZ5100/ 5100RH/ EB6200 Model HB2302 EBZ3000/ 3000RH 5100Q EBZ7100/ 7100RH EBZ8001/ 8001RH Blower Model HBZ2601 EB4300 EBZ4800 EB7000 － － － － HB2311EZ EBZ3050RH EBZ5150/ 5150RH/ EBZ7150/ 7150RH EBZ8050/ 8050RH EB7001 5150Q Thread size M14x1.25 M10x1.0 ← M14x1.25 M10x1.0 ←...

  • Page 63: Troubleshooting

    8. Troubleshooting 8-1 Engine does not start Remove the spark plug from the cylinder. Put the spark plug on the outside of the cylinder. Pull the recoil starter knob, and check whether sparks arise in the spark gap or not. Trouble Probable Cause Countermeasure...

  • Page 64: Lack Of Output Power Or Unstable Revolution

    8. Troubleshooting 8-4 Lack of output power or unstable revolution Trouble Probable Cause Countermeasure Compression is 1. Air is entering at fuel pipe joints, etc Secure connections. normal and no misfire. 2. Air is entering at intake tube joint or carburetor joint Replace gasket or tighten screws.
  • Page 66 Printed in Japan 0901 SY – 015...

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