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SERVICE MANUAL

TILLOTSON LTD., CLASH INDUSTRIAL ESTATE,

TRALEE, CO. KERRY, IRELAND

PHONE: +353 66 7121911 FAX: +353 66 7124503

e-mail: [email protected]

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Summary of Contents for HU Series

Page 1: ...SERVICE MANUAL TILLOTSON LTD CLASH INDUSTRIAL ESTATE TRALEE CO KERRY IRELAND PHONE 353 66 7121911 FAX 353 66 7124503 e mail sales tillotson ie ...

Page 2: ...mp Diaphragm Inlet Valve 5B Pump Diaphragm Outlet Valve 6 Fuel Pump Body 7 Fuel Pump Gasket 8 Fuel Inlet 9 Impulse Channel 10 Throttle Shutter 11A Primary Idle Discharge Port 11B Secondary Idle Discharge Port 12 Body 13 Idle Fuel Adjustment 14 Metering Chamber 15 Idle Fuel Adjustment Orifice 16 Diaphragm Cover 17 Metering Diaphragm 18 Atmospheric Chamber 19 Atmospheric Vent 20 Main Fuel Adjustment...

Page 3: ... the needle on its seat A metering diaphragm is subjected to engine suction on the metering chamber side and atmospheric pressure on the vented side Atmospheric pressure on the vented side pushes the diaphragm toward the inlet control lever opening the inlet needle to allow fuel to enter the metering chamber from which it is then delivered into the mixing passages The inlet control lever hooks on ...

Page 4: ...press the inlet control lever overcoming inlet tension spring pressure permitting fuel to enter through the inlet seat then into the fuel chamber side of main diaphragm up through the idle and high speed fuel supply orifices and channels and out the discharge ports to the engine IDLING OPERATION When engine is idling throttle shutter is partially cracked Engine suction is transmitted through the p...

Page 5: ... the venturi throat is less than existing within main diaphragm fuel chamber fuel is drawn up through high speed mixture orifice and out main fuel discharge port into air stream entering engine intake HIGH SPEED OPERATION As the throttle shutter progressively opens from intermediate position to full open position the air velocity through the venturi increases and fuel is metered up through high sp...

Page 6: ...y and locates on the dimple of the inlet control lever as illustrated above CAUTION Do not stretch spring Inlet control lever is properly set when flush with the floor of the diaphragm chamber If diaphragm end of control lever is low pry up If lever is high depress diaphragm end and push on needle for proper adjustment See illustration On some models the inlet control lever is hooked to the inlet ...

Page 7: ...uel system from tank to pump 3 Ruptured fuel pump diaphragm 4 Main fuel orifice plugged Carburetor Runs Rich with High Speed Mixture Screw Shut Off 1 The 3 6 diameter nozzle cup plug nozzle check valve cage is not sealing Remove clean and replace Remove lever and reinstall Replace diaphragm or correct installation Readjust Reset Tighten Replace Remove diaphragm cover diaphragm diaphragm lever and ...

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