TILLOTSON HU Series Service Manual
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TILLOTSON HU Series Service Manual

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TILLOTSON LTD., CLASH INDUSTRIAL ESTATE,
TRALEE, CO. KERRY, IRELAND
PHONE: +353 66 7121911 FAX: +353 66 7124503
e-mail: sales@tillotson.ie
SERVICE MANUAL

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Summary of Contents for TILLOTSON HU Series

  • Page 1 TILLOTSON LTD., CLASH INDUSTRIAL ESTATE, TRALEE, CO. KERRY, IRELAND PHONE: +353 66 7121911 FAX: +353 66 7124503 e-mail: sales@tillotson.ie SERVICE MANUAL...
  • Page 2 To keep apace of new market demands Tillotson has designed and developed a new miniature all- position diaphragm carburetor, the HU series. This versatile unit is lightweight and compact, only a 1-1/8 “ cube, but it still comprises a self-contained fuel pump and filtering screen...

  • Page 3: Construction Data

    CONSTRUCTION DATA The HU series carburetor is die-cast aluminium, consisting of three basic parts: metering body, pump cover plate and main diaphragm cover plate. This carburetor incorporates many of the components found in float type carburetors: throttle, idle and high speed mixture screws, idle speed screw and inlet needle.
  • Page 4 STARTING CHOKE OPERATION Starting an engine with the “HU” Carburetor involves the same methods that are used in a conventional float feed carburetor When starting a cold engine, place the shutter blade in the closed position and throttle shutter in a cracked or open position.

  • Page 5: High-Speed Operation

    INTERMEDIATE OPERATION Fuel is delivered into and through the carburetor in the same manner as when the engine is idling. However, as the throttle opens and engine speed increases, more fuel is supplied to the engine by valving in the secondary idle discharge port located immediately behind the throttle shutter.

  • Page 6: Service Hints

    HOW TO DISASSEMBLE FOR CLEANING AND REPAIR Before disassembling carburetor it is imperative to flush it clean of sawdust and dirt by pouring gasoline over it and tools. 7. Remove inlet needle Remove pump diaphragm cover screws and Remove idle and high speed mixture screws cover.

  • Page 7: Troubleshooting

    TROUBLE SHOOTING Carburetor Floods 1. Dirt or foreign particles preventing inlet Remove, clean and replace. needle from seating. 2. Diaphragm lever spring not seated on Remove, lever and reinstall lever dimple. 3. Diaphragm improperly installed in Replace diaphragm or correct installation. carburetor.

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