Mitsubishi FGC15 FGC18 FGC20 FGC20HP FGC25HP FGC30 Forklift Trucks (Engine) Service Repair Workshop Manual

Service Manual Liquefied Petroleum Gas Supplement 4G63 AA0001-ZZ9999 4G64 AA0001-ZZ9999 6G72 0A0001-0Z9999 99729-75100 For use with 4G63, 4G64 & 6G72 Engine Service Manuals.

CAUTION Indicates items that users must always observe in order to prevent injuries and damage to the vehicle and surrounding area. Note Supplementary explanation INTRODUCTION LP-gas (Liquefied Petroleum gas) forklift trucks are superior to gasoline forklift trucks in many ways including cleaner emissions and higher fuel efficiency. LP-gas is, however, more dangerous than gasoline when handled improperly. This Service Manual contains operating instructions and maintenance procedures for the LP-gas device of Mitsubishi LP-gas fuel forklift trucks. To ensure safety and maximize the superb fea- tures of your forklift truck, read this manual thoroughly. The following mark and designation are used in this manual to call your attention to important instructions and cautions. < Warning indication > 99729-75100

TABLE OF CONTENTS Types of LP-gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Guideline for selecting LP-gas for forklift-truck engines . . . . . . . . . . . . . . . . . . . . . . . . . .1 LP-gas knock rating and octane number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Adverse effects of olefins on LP-gas fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Vapor pressure vs. temperature for mixture of propane and normal butane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Structure and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1. Outline of LP-gas device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. LP-gas device layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. Main component structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3.1. LP-gas tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3.1.1. Pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3.1.2. Fixed liquid level gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 3.1.3. Service valve (LP-gas outlet valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 3.1.4. Fuel level indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 3.2. Filter (Vacuum fuel lock filter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 3.3. Hydrostatic relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.4. Converter (vaporizer) and LP-gas carburetor . . . . . . . . . . . . . . . . . . . . . . . . . .11 3.4.1. Converter (vaporizer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 3.4..2. LP-gas carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Actions to be taken in the event of a failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Disassembly and reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 1. Main components of LP-gas device (4G63, 4G64) . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 2. Main components of LP-gas device (6G72) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 3. Disassembly and reassembly of LP-gas carburetor /mixer . . . . . . . . . . . . . . . . . . . . . . .19 4. Disassembly and reassembly of converter/regulator (vaporizer) . . . . . . . . . . . . . . . . . .21 5.Disassembly and reassembly of LP-gas filter, Fuel lock . . . . . . . . . . . . . . . . . . . . . . . .27 Inspection and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 1. LP-gas tank inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 2. Filter inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 3. Converter (vaporizer) inspection and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 4. Idle speed adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 5. Output power adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 6. Gas leak check procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 i

Mitsubishi FGC15 FGC18 FGC20 FGC20HP FGC25HP FGC30 Forklift Trucks (Engine) Service Repair Workshop Manual

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