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<!-- Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 30-January-2020 [11:31:48] {AM} --> |
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| <link:definition> 1012 - Disclosure - Customers with 10% (or greater) of Net Revenues </link:definition> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/InventoriesTables" id="InventoriesTables"> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/CostsAndEstimatedEarningsInExcessOfBillingsTables" id="CostsAndEstimatedEarningsInExcessOfBillingsTables"> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/EarningsPerShareDataTables" id="EarningsPerShareDataTables"> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/RevenueRecognitionAndRelatedCostsTables" id="RevenueRecognitionAndRelatedCostsTables"> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/MarketableSecuritiesCompanysAssetsMeasuredAtFairValueDetail" id="MarketableSecuritiesCompanysAssetsMeasuredAtFairValueDetail"> |
| <link:definition> 1021 - Disclosure - Marketable Securities - Company's Assets Measured at Fair Value (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/MarketableSecuritiesAdditionalInformationDetail" id="MarketableSecuritiesAdditionalInformationDetail"> |
| <link:definition> 1022 - Disclosure - Marketable Securities - Additional Information (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/InventoriesNetInventoriesDetail" id="InventoriesNetInventoriesDetail"> |
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| <link:usedOn> link:definitionLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.gencor.com/role/InventoriesAdditionalInformationDetail" id="InventoriesAdditionalInformationDetail"> |
| <link:definition> 1024 - Disclosure - Inventories - Additional Information (Detail) </link:definition> |
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| <link:usedOn> link:definitionLink </link:usedOn> |
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| <link:definition> 1025 - Disclosure - Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Detail) </link:definition> |
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| <link:definition> 1029 - Disclosure - Income Taxes - Additional Information (Detail) </link:definition> |
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| <element name="CustomerOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_CustomerOneMember" substitutionGroup="xbrli:item"/> |
| <element name="CustomerSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_CustomerSixMember" substitutionGroup="xbrli:item"/> |
| <element name="CustomerThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_CustomerThreeMember" substitutionGroup="xbrli:item"/> |
| <element name="CustomerTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_CustomerTwoMember" substitutionGroup="xbrli:item"/> |
| <element name="IncometaxestableTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_IncometaxestableTable" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="IncometaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_IncometaxesLineItems" substitutionGroup="xbrli:item"/> |
| <element name="EquipmentSalesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_EquipmentSalesMember" substitutionGroup="xbrli:item"/> |
| <element name="FreightRevenueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_FreightRevenueMember" substitutionGroup="xbrli:item"/> |
| <element name="OtherRevenuesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_OtherRevenuesMember" substitutionGroup="xbrli:item"/> |
| <element name="PartsAndComponentSalesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_PartsAndComponentSalesMember" substitutionGroup="xbrli:item"/> |
| <element name="CurrentLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="genc_CurrentLiabilitiesMember" substitutionGroup="xbrli:item"/> |
| <element name="ContractWithCustomerAccountsReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="genc_ContractWithCustomerAccountsReceivable" substitutionGroup="xbrli:item" xbrli:balance="debit"/> |
| <element name="ExpectedPeriodForContractAssetsBillingAndCollection" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="genc_ExpectedPeriodForContractAssetsBillingAndCollection" substitutionGroup="xbrli:item"/> |
| <element name="IncrementalCostsAmortizationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="genc_IncrementalCostsAmortizationPeriod" substitutionGroup="xbrli:item"/> |
| </schema> |