{"product_id":"4936218-genuine-cummins®-air-compressor-for-cummins-isl-isc-qsl9","title":"4936218 | Genuine Cummins® Air Compressor For Cummins ISL, ISC, QSL9","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eAn Air Compressor\u003cstrong\u003e 4936218 \u003c\/strong\u003eis the engine-driven pump that supplies compressed air for a truck or bus air brake system. Single Cylinder Air Compressor For Cummins ISL, ISC, QSL9\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 4936218, 4936218RX\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Cummins\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cstrong data-start=\"160\" data-end=\"176\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eFits 4936218 \u003c\/strong\u003eFor Cummins Engine\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eCummins ISC \/ ISC 8.3\u003c\/span\u003e\n\u003cp\u003eCummins ISL \/ ISL9\u003cbr\u003eCummins QSC \/ QSL9\u003cbr\u003eSome ISB \/ QSB applications\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul id=\"catalogModels\" class=\"nav catalog\"\u003e\u003c\/ul\u003e\n\u003cp data-start=\"160\" data-end=\"353\"\u003e\u003cstrong\u003ePurpose of using 4936218:\u003c\/strong\u003e\u003cstrong data-start=\"585\" data-end=\"597\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-start=\"266\" data-end=\"314\"\u003e\u003cstrong\u003e1. Operates the air brakes (primary purpose)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"315\" data-end=\"479\"\u003e\n\u003cli data-start=\"315\" data-end=\"415\"\u003e\n\u003cp data-start=\"317\" data-end=\"344\"\u003eSupplies compressed air to:\u003c\/p\u003e\n\u003cul data-start=\"347\" data-end=\"415\"\u003e\n\u003cli data-start=\"347\" data-end=\"367\"\u003e\n\u003cp data-start=\"349\" data-end=\"367\"\u003e\u003cstrong data-start=\"349\" data-end=\"367\"\u003eService brakes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"370\" data-end=\"390\"\u003e\n\u003cp data-start=\"372\" data-end=\"390\"\u003e\u003cstrong data-start=\"372\" data-end=\"390\"\u003eParking brakes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"393\" data-end=\"415\"\u003e\n\u003cp data-start=\"395\" data-end=\"415\"\u003e\u003cstrong data-start=\"395\" data-end=\"415\"\u003eEmergency brakes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"416\" data-end=\"479\"\u003e\n\u003cp data-start=\"418\" data-end=\"479\"\u003eKeeps air tanks charged so brakes apply and release correctly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"481\" data-end=\"624\"\u003e\u003cstrong data-start=\"481\" data-end=\"500\"\u003eWhy it matters:\u003c\/strong\u003e\u003cbr data-start=\"500\" data-end=\"503\"\u003eWithout air pressure, the brakes \u003cstrong data-start=\"536\" data-end=\"555\"\u003ecannot function\u003c\/strong\u003e—and the system is designed to apply brakes automatically for safety.\u003c\/p\u003e\n\u003cp data-start=\"631\" data-end=\"675\"\u003e\u003cstrong\u003e2. Maintains safe operating air pressure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"676\" data-end=\"835\"\u003e\n\u003cli data-start=\"676\" data-end=\"723\"\u003e\n\u003cp data-start=\"678\" data-end=\"723\"\u003eContinuously replaces air lost during braking\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"724\" data-end=\"774\"\u003e\n\u003cp data-start=\"726\" data-end=\"774\"\u003eWorks with the \u003cstrong data-start=\"741\" data-end=\"753\"\u003egovernor\u003c\/strong\u003e to regulate pressure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"775\" data-end=\"835\"\u003e\n\u003cp data-start=\"777\" data-end=\"835\"\u003eKeeps pressure in the safe range (usually \u003cstrong data-start=\"819\" data-end=\"834\"\u003e120–135 PSI\u003c\/strong\u003e)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"837\" data-end=\"913\"\u003e\u003cstrong data-start=\"837\" data-end=\"856\"\u003eWhy it matters:\u003c\/strong\u003e\u003cbr data-start=\"856\" data-end=\"859\"\u003eConsistent pressure = predictable braking performance.\u003c\/p\u003e\n\u003cp data-start=\"920\" data-end=\"960\"\u003e\u003cstrong\u003e3. Powers other air-operated systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"961\" data-end=\"1003\"\u003eBeyond brakes, compressed air is used for:\u003c\/p\u003e\n\u003cul data-start=\"1004\" data-end=\"1116\"\u003e\n\u003cli data-start=\"1004\" data-end=\"1024\"\u003e\n\u003cp data-start=\"1006\" data-end=\"1024\"\u003e\u003cstrong data-start=\"1006\" data-end=\"1024\"\u003eAir suspension\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1025\" data-end=\"1044\"\u003e\n\u003cp data-start=\"1027\" data-end=\"1044\"\u003e\u003cstrong data-start=\"1027\" data-end=\"1044\"\u003eClutch assist\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1045\" data-end=\"1060\"\u003e\n\u003cp data-start=\"1047\" data-end=\"1060\"\u003e\u003cstrong data-start=\"1047\" data-end=\"1060\"\u003eAir horns\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1061\" data-end=\"1088\"\u003e\n\u003cp data-start=\"1063\" data-end=\"1088\"\u003e\u003cstrong data-start=\"1063\" data-end=\"1088\"\u003eTransmission controls\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1089\" data-end=\"1116\"\u003e\n\u003cp data-start=\"1091\" data-end=\"1116\"\u003e\u003cstrong data-start=\"1091\" data-end=\"1116\"\u003eDoors and accessories\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1118\" data-end=\"1198\"\u003e\u003cstrong data-start=\"1118\" data-end=\"1137\"\u003eWhy it matters:\u003c\/strong\u003e\u003cbr data-start=\"1137\" data-end=\"1140\"\u003eOne compressor supports multiple critical vehicle systems.\u003c\/p\u003e\n\u003cp data-start=\"1205\" data-end=\"1237\"\u003e\u003cstrong\u003e4. Ensures fail-safe braking\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1238\" data-end=\"1342\"\u003e\n\u003cli data-start=\"1238\" data-end=\"1275\"\u003e\n\u003cp data-start=\"1240\" data-end=\"1275\"\u003eAir brake systems are \u003cstrong data-start=\"1262\" data-end=\"1275\"\u003efail-safe\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1276\" data-end=\"1342\"\u003e\n\u003cp data-start=\"1278\" data-end=\"1342\"\u003eIf pressure drops too low, \u003cstrong data-start=\"1305\" data-end=\"1342\"\u003espring brakes apply automatically\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1344\" data-end=\"1412\"\u003e\u003cstrong data-start=\"1344\" data-end=\"1363\"\u003eWhy it matters:\u003c\/strong\u003e\u003cbr data-start=\"1363\" data-end=\"1366\"\u003ePrevents runaway vehicles and loss of control.\u003c\/p\u003e\n\u003cp data-start=\"1419\" data-end=\"1464\"\u003e\u003cstrong\u003e5. Supports vehicle safety and compliance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1465\" data-end=\"1565\"\u003e\n\u003cli data-start=\"1465\" data-end=\"1517\"\u003e\n\u003cp data-start=\"1467\" data-end=\"1517\"\u003eRequired by law for heavy vehicles with air brakes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1518\" data-end=\"1565\"\u003e\n\u003cp data-start=\"1520\" data-end=\"1565\"\u003eMust meet DOT air-pressure build-up standards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1567\" data-end=\"1671\"\u003e\u003cstrong data-start=\"1567\" data-end=\"1586\"\u003eWhy it matters:\u003c\/strong\u003e\u003cbr data-start=\"1586\" data-end=\"1589\"\u003eA properly functioning compressor keeps the vehicle \u003cstrong data-start=\"1641\" data-end=\"1670\"\u003elegal and safe to operate\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-start=\"160\" data-end=\"353\"\u003e\u003cstrong data-start=\"585\" data-end=\"597\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of a Bad Air Compressor 4936218:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"264\" data-end=\"297\"\u003e\u003cstrong\u003e1. Slow air pressure build-up\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"298\" data-end=\"444\"\u003e\n\u003cli data-start=\"298\" data-end=\"352\"\u003e\n\u003cp data-start=\"300\" data-end=\"352\"\u003eTakes much longer than normal to reach operating PSI\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"353\" data-end=\"444\"\u003e\n\u003cp data-start=\"355\" data-end=\"444\"\u003eFails DOT air build-up test\u003cbr data-start=\"382\" data-end=\"385\"\u003e\u003cstrong data-start=\"385\" data-end=\"395\"\u003eCause:\u003c\/strong\u003e Worn piston rings, leaking valves, internal wear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"451\" data-end=\"483\"\u003e\u003cstrong\u003e2. Won’t reach full pressure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"484\" data-end=\"599\"\u003e\n\u003cli data-start=\"484\" data-end=\"516\"\u003e\n\u003cp data-start=\"486\" data-end=\"516\"\u003ePressure stalls below ~120 PSI\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"517\" data-end=\"599\"\u003e\n\u003cp data-start=\"519\" data-end=\"599\"\u003eGovernor never cuts out\u003cbr data-start=\"542\" data-end=\"545\"\u003e\u003cstrong data-start=\"545\" data-end=\"555\"\u003eCause:\u003c\/strong\u003e Internal leakage or failing compressor head\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"606\" data-end=\"639\"\u003e\u003cstrong\u003e3. Air pressure drops quickly\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"640\" data-end=\"758\"\u003e\n\u003cli data-start=\"640\" data-end=\"675\"\u003e\n\u003cp data-start=\"642\" data-end=\"675\"\u003ePressure falls fast after braking\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"676\" data-end=\"758\"\u003e\n\u003cp data-start=\"678\" data-end=\"758\"\u003eLow-air warning comes on often\u003cbr data-start=\"708\" data-end=\"711\"\u003e\u003cstrong data-start=\"711\" data-end=\"721\"\u003eCause:\u003c\/strong\u003e Compressor can’t keep up with demand\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"765\" data-end=\"811\"\u003e\u003cstrong\u003e4. Excessive oil in air lines or air dryer\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"812\" data-end=\"939\"\u003e\n\u003cli data-start=\"812\" data-end=\"844\"\u003e\n\u003cp data-start=\"814\" data-end=\"844\"\u003eOily residue in tanks or dryer\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"845\" data-end=\"939\"\u003e\n\u003cp data-start=\"847\" data-end=\"939\"\u003eOil blowing out of air dryer purge\u003cbr data-start=\"881\" data-end=\"884\"\u003e\u003cstrong data-start=\"884\" data-end=\"894\"\u003eCause:\u003c\/strong\u003e Worn compressor rings or seals (very common)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"946\" data-end=\"967\"\u003e\u003cstrong\u003e5. Unusual noises\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"968\" data-end=\"1086\"\u003e\n\u003cli data-start=\"968\" data-end=\"998\"\u003e\n\u003cp data-start=\"970\" data-end=\"998\"\u003eKnocking, rattling, grinding\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"999\" data-end=\"1086\"\u003e\n\u003cp data-start=\"1001\" data-end=\"1086\"\u003eLoud ticking that wasn’t there before\u003cbr data-start=\"1038\" data-end=\"1041\"\u003e\u003cstrong data-start=\"1041\" data-end=\"1051\"\u003eCause:\u003c\/strong\u003e Mechanical wear or internal damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1093\" data-end=\"1111\"\u003e\u003cstrong\u003e6. Overheating\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1112\" data-end=\"1244\"\u003e\n\u003cli data-start=\"1112\" data-end=\"1143\"\u003e\n\u003cp data-start=\"1114\" data-end=\"1143\"\u003eCompressor runs extremely hot\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1144\" data-end=\"1244\"\u003e\n\u003cp data-start=\"1146\" data-end=\"1244\"\u003eBurnt smell near compressor\u003cbr data-start=\"1173\" data-end=\"1176\"\u003e\u003cstrong data-start=\"1176\" data-end=\"1186\"\u003eCause:\u003c\/strong\u003e Restricted air flow, lubrication issues, overworking unit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1251\" data-end=\"1285\"\u003e\u003cstrong\u003e7. Air dryer purging too often\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1286\" data-end=\"1382\"\u003e\n\u003cli data-start=\"1286\" data-end=\"1382\"\u003e\n\u003cp data-start=\"1288\" data-end=\"1382\"\u003eDryer purges constantly or irregularly\u003cbr data-start=\"1326\" data-end=\"1329\"\u003e\u003cstrong data-start=\"1329\" data-end=\"1339\"\u003eCause:\u003c\/strong\u003e Compressor struggling to maintain pressure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1389\" data-end=\"1421\"\u003e\u003cstrong\u003e8. Engine performance issues\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1422\" data-end=\"1505\"\u003e\n\u003cli data-start=\"1422\" data-end=\"1437\"\u003e\n\u003cp data-start=\"1424\" data-end=\"1437\"\u003eLoss of power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1438\" data-end=\"1505\"\u003e\n\u003cp data-start=\"1440\" data-end=\"1505\"\u003eIncreased engine load\u003cbr data-start=\"1461\" data-end=\"1464\"\u003e\u003cstrong data-start=\"1464\" data-end=\"1474\"\u003eCause:\u003c\/strong\u003e Compressor seizing or dragging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1512\" data-end=\"1566\"\u003e\u003cstrong\u003e9. Coolant or oil leaks (water-cooled compressors)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1567\" data-end=\"1674\"\u003e\n\u003cli data-start=\"1567\" data-end=\"1601\"\u003e\n\u003cp data-start=\"1569\" data-end=\"1601\"\u003eOil in coolant or coolant in oil\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1602\" data-end=\"1674\"\u003e\n\u003cp data-start=\"1604\" data-end=\"1674\"\u003eExternal leaks at compressor\u003cbr data-start=\"1632\" data-end=\"1635\"\u003e\u003cstrong data-start=\"1635\" data-end=\"1645\"\u003eCause:\u003c\/strong\u003e Failed seals or cracked head\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1681\" data-end=\"1718\"\u003e\u003cstrong\u003e10. Brake warning lights \/ alarms\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1719\" data-end=\"1828\"\u003e\n\u003cli data-start=\"1719\" data-end=\"1742\"\u003e\n\u003cp data-start=\"1721\" data-end=\"1742\"\u003eLow-air buzzer sounds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1743\" data-end=\"1828\"\u003e\n\u003cp data-start=\"1745\" data-end=\"1828\"\u003eBrake warning light stays on\u003cbr data-start=\"1773\" data-end=\"1776\"\u003e\u003cstrong data-start=\"1776\" data-end=\"1786\"\u003eCause:\u003c\/strong\u003e Insufficient air pressure from compressor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAbout the Manufacturer – \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eCummins:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"0\" data-end=\"381\"\u003eCummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.\u003c\/p\u003e\n\u003cp data-start=\"383\" data-end=\"628\"\u003eThe brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.\u003c\/p\u003e","brand":"Cummins","offers":[{"title":"Default Title","offer_id":50721277247735,"sku":"4936218","price":1079.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/s-l400_2_fad05795-59f7-4e0f-b6de-e93a8481f8b8.jpg?v=1777413823","url":"https:\/\/forcetruckparts.com\/products\/4936218-genuine-cummins%c2%ae-air-compressor-for-cummins-isl-isc-qsl9","provider":"Force Truck Parts","version":"1.0","type":"link"}