Regular Maintenance

• Wheel nuts: To eliminate the possibility of the wheel studs being sheared or the bold holes in the wheels becoming elongated, all whenn nuts should be rightened at frequent intervals.
• Tire rotation: Periodic rotation of the tires should be done only if tires are wearing unevenly.
• Tire and wheel balance: Consult FMC service center at the first sign of erratic wheel action or abnormal vibration so the wheel and tire balance can be inspected and corrected with proper equipment.
• Wheen alignment: should be done by FMC service center with proper equipment.
• Lubrication: If you operate the motor coach under conditions of extreme heat or over dusty unimproved roads, increase the frequency of the basic recommendation.
• Engine oil (EO).
• Lubricant multi purpose (MG).
• Gear lubricant (GL). SAE 140, MPL-L-2105B, for all temperatures.
• Automatic Transmission Fluid (AT). DEXRON Automatic Transmission Fluid. Used in transmission and power steering unit.
• Brake fluid (BF). SAE J1703.
• Every 2,000 miles or 3 months
  • Inspect and clean engine emission control items.
• Every 4,000 miles or 6 months
  • Brake master cylinder, BF - high temp brake fluid. 1/2 pint.
  • Differential, GL - multipurpose lubricant. 75-90 SEA-140. 2 gallons.
  • Engine air cleaner element, clean or replace.
  • Transmission oil check. AT - Dexron Automatic Transmission Fluid. 18 pints.
  • Crankcase ventilation system. Check PCV valve, cleaner hoses, and carb choke for proper operation.
  • Engine oil drain & fill. EO - Engine Oil designated "MS". 6 quarts. When filter is replaced, add 1 quart.
  • Power steering reservoir. AT - Dexron Automatic Transmission Fluid. Inspect and add. 4 quarts.
• Every 12,000 miles or annually
  • Engine fuel filter. Change filter element.
  • Engine water pump. Use low pressure grease gun. MG - Multipurpose grease, MLG1, grade 2EP.
  • Propeller shafts. MG - Multipurpose NLG1 grade 2EP.
• Every 20,000 miles or 2 years
  • Transmission oil drain & fill. Initial change at 32,000 miles under normal operating conditions; 20,000 mile intervals thereafter.
• As specified
  • Automotive and domestic batteries. Check level. Add distilled water.
  • Brake booster air cleaner. Change air cleaner filter on front and rear boosters.
  • Engine oil filter. EO - Engine Oil designated "M5". Inspect and change. 1 quart.
  • Radiator coolant. Check coolant level. 25 quarts.
  • Front spring U bolt nuts. Check tightness. Torque to 171-189 foot pounds.
  • Wheel bearings. MG - Multipurpose grease, NLG1, grade 2EP.
  • Winshield washer reservoirs. Winshield solvent. Inspect and add. 1 quart.
  • Auxiliary power unit. EO - Engine Oil designated "M5". 4 quarts.
• Brake master cylinder. Fluid should be checked each 4,000 miles or 6 months of operation. Replentish with heavy duty hydraulic brake fluid (BF) conforming to SAE J1703 specification. Brake fluids not clearly identified with these specifications should not be used. Normal brake fluid level is 1/4 incl below filler cap. Check systems for leaks if fluid is frequently low.
• Windshield washer reservoid. Fluid should be checked before starting on a trip and at each lubrication and oil change period. Fill with good grade of windshield solvent and in cold eeather use an antifreeze specifically made for washer use.
• Brake booster air cleaner. Replace cartridge every second oil change or if operating in dusty areas every 4,000 miles or 6 months.
• Wheel bearing front and rear. Once every 12,000 miles or anually, remove hub and inspect bearings. If grease is in poor condition, insufficient quantity, or if vehicle has been operated under severe conditions, clean the bearings, races, and hub cavity thoroughly. Repack the bearings with Grease NLG1 Grade 2. Wheel hub cavities should be packed to fill all spaces. Never add grease - relibricate completely.
• Engine oil drain. Change every 4,000 miles or 6 months under normal driving conditions. For abnormal service -- such as short trips, prolonged and frequent idling, and dusty conditions -- change oil every 2,000 miles or 3 months. Drain while engine is a normal operating temperature (180 F). Oil drains more completely when hot, and any fireign matter and contaminants will be removed with the oil.
• Engine oil dipstick. Engine oil level should be checked each time you stop for fuel. The "FULL" mark indicates correct level of oil after engine has been standing for some time. When engine is running, oil level drops slightly as it fills up the oil passages and channels. Add a quart when oil falls below "ADD OIL" mark on dipstick. Never allow oil level to remain below the "ADD OIL" mark.
• Automotive and domestic batteries. Check water level and bring up to split ring level each oil change. Check more frequently if operating in hot areas for substantial periods. Use distilled water whenever available.
• Power steering reservoir. Check fluid level every 4,000 miles or 6 months or with each oil change. Start engine, turn steering wheel from stop-to-stop several times to expel air from system, then shut off engine. Wipe reservoir filler cap free of dirt, remove cap, check oil level. Add fluid if necessary. Use only approved DEXRON Automatic Transmission Fluid.
• Engine oil filter. Replace filter or cartridge every second oil change. Always replace with a Chrysler or a first-line filter or cartridge. If operating in dusty areas, replace oil filter cartridge more frequently, such as at each oil change. After replacement, operate engine for 5 minutes and chack for oil leaks. Add enough oil to compensate for oil absorbed by a new filter.
• Engine water pump. Every 12,000 miles or annually, lubricate fitting located on water pump housing behind camshaft pulley with multipurpose grease NLG1, grade 2 EP. Do not use a high pressure grease gun on t his fitting.
• Radiator fill and level. Coolant should be chacked before starting on a trip and at each lubrication and oil change period. Coolant should be within 3.5 inches of top of filler neck. Fill with clear water. In cold weather use a good grade of automotive antifreeze. Drain and flush system every 12,000 miles or annually.
• Engine fuel filter. Replace element every 12,000 miles or annually. Run engine and test for leaks.
• Engine oil fill. Add oil if dipstick is at or below "ADD OIL" mark. Use only oils meeting API classifications "for service M5 MIL-L2104B" with a viscosity rating suitable to temperature conditions. Above 32F use: SAE100W-30, SAE30, SAE20W-40 or SAE20W-50; between 32F and -10F use: SAE20W, SAE10W-30, SAE10W, or SAE5W-20; below -10F use: SAE5W-20. Never use straight mineral or nondetergent oils.
• Crankcase clean air emission system. Check every 4,000 miles or 6 months, or more frequently if coach is used for short trip driving, and prolonged and frequent idling. Operate engine at idle and remove ventilator valve from rocker cover. If valve is not plugged, a hissing noise will be heard and a strong vacuum should be felt when you place your finger over valve inlet. Reinstall valve, then remove crankcase inlet air cleaner. Loosely hold a piece of stiff paper (parts tag) over opening in rocker cover. After about 1 minute, paper should be pulled against opening in rocker cover.
  Stop engine and remove ventilator valvbe from rocker cover. If valve is free, a clicking noise will be heard. If system meets the above tests, no further service is required. If not, replace ventilator valve with a new valve and recheck system. Do not attempt to clean the old valve.
  Disconnect hose between carburetor air cleaner and crankcase inlet air cleaner (left valve cover). Inspect hose for blockage and clean if necessary. Remove crankcase inlet air cleaner and wash in kerosene or similar solvent. Wet the inlet air cleaner filter by inverting cleaner and filling with SAE30 engine oil. Allow excess oil to drain through vent nipple at top of cleaner. Reinstall cleaner and connect hose.
  Upon recheck, if paper is not pulled against the opening in rocker cover with noticeable force, clean ventilator hoses and passages in lower part of carburetor. Clean in a good grade of solvent and dry with compressed air.
• Propeller shafts. Lubricate every 12,000 miles or annually with multipurpose grease, NLG1 Grade 2 EP. Apply grease to fitting at each universal joint located on both sides of coach and on the transmission to differential shaft. Lubricate slip yokes with Molybendum Disulfide Grease. Do not use a high pressure grease gun.
• Air cleaner element and carburetor automatic choke. Every 4,000 miles or 6 months, remove element and blow out dirt gently with an air hose. Direct air from the inside out, and keep nozzle 2 inches away from element to aviud damage. If element is saturated with oil for more than one-half of its circumference, replace element and check crankcase clean air emission system. Clean metal container. Every 20,000 miles or 2 years, install a new element. Service air cleaner element more frequently if driving in severe conditions, such as dusty areas.
  To prevent choke from sticking, apply a combustion chamber conditioner to choke shaft where it rotates in the air horn. Move choke shaft back and forth to distribute solvent. This will prevent formation of gum deposits on shaft which may restrict its movement. Apply same solvent to fast idle cam and pivot pin to remove dirt, oil, and other deposits which could cause sticking or erratic motion. Apply conditioner at least every 4,000 miles or 6 months.
• Transmission oil dipstick. Check fluid level every 4,000 miles or 6 months. To check, start engine and bring transmission up to normal operating temperature. With parking brake ON and engine idling, move selector lever into each position enging in the "N" position. Remove dipstick: fluid level should be between "FULL" and "ADD ONE PINT" marks, but never above the "FULL" mark when engine is warmed up. Add or drain fluid to bring to proper level. Make certain cap is reseated properly on filler tube.
• Transmission drain and fill. Under normal operation drain fluid at 32,000 miles. At same time, clean filter. When operating under severe service with heavy loads, trailer towing, or off highway, especially in hot weather, increase frequency of service to 20,000 mile intervals. To drain, place a container with a large opening under transmission oil pan. Loosen pan bolts and tap pan bolts at one corner to break pin loose and allow fluid to drain. Remove access plate from front of converter, remove drain plug and drain fluid. Install drain plug (torque to 100 inch-pounds) and install access plate. Remove and clean oil pan. Use a new gasket and install oil pan. Tighten pan screws to 150-inch pounds. Add DEXRUN type automatic transmission fluid through filler tube and check level as in previous note.
• Differential drain and fill. Every engine oil change, remove differential filler plug and check lubricant level. Add multipurpose gear libricant (SAE 140, MIL-L-2105B) to bring level up to bottom of filler hole plug. Do not overfill. Drain differential and refill prior to any anticipated temperature change or after every 32,000 miles of operation, whichever occurs first. In severe or abnormal operating conditions, change lubricant every 20,000 miles.
• Front spring. Check tightness of front spring U bolt attaching nuts within the first 500 miles of operation. Thereafter, check U bolt nuts each time coach is lubricated. Recommended torque is 171 to 189 foot-points.
• Auxilary power unit dipstick. Every 8 operational hours, remove oil filler cap and check level on dipstick. Keep oil at "FULL" mark. Never operate APU with oil level below "LOW" mark. Replace cap tightly to prevent oil leakage. When adding oil between changes, always use same brand that is in crankcase.
• Auxilary power unit air cleaner. Every 100 operational hours, remove paper element and clean by removing foam wrapper and tapping element against a flat surface to loosen dust and dirt. Blow out dirt from the clean to the dirty side, using less than 100 psi air pressure. If necessary, wash element and foam wrapper in a solution of warm water and mild detergent.
  Evert 500 operational hours, change the cartridge. Remove wing screw and cover; install new cartridge and secure with wing screw and cover.
• Auxiliary power unit crankcase oil and filter. Every 100 operational hours, drain crankcase oil and refill with good quality heavy duty oil. If operating consistently at high temperatures (100F and above), change oil every 50 operational hours. Use only oils meeting API designations M5, MS/DG, SE, SE/CC, or MIL-L-2104B. Use proper grade oil for the expected conditions: Above 90F use SAE 50; 30F to 90F use SAE 30; 0F to 30F use SAE 10W-40, 5W-30; below 0F use 5W-30.
  Every 200 operational hours, change the crankcase oil filter. Remove filter by turning counterclockwise using a filter wrench. Clean and wipe dry the drip pan below the filter. Install new filter and gasket and tighten finger tight 1/4 to 1/2 turn.
• Auxiliary power unit fuel pump:. Remove lower cover on fuel pump and clean screen in good grade of solvent.
• Auxiliary power unit spark plugs. Check spark plug gap and set to 0.025 inch on both plugs.
• Emission control maintenance services
  • Air cleaner hoses. Inspect 4, 12; replace 20.
  • Air cleaner element. Clean 2, 4, 12; replace 20.
  • Crankcase ventilator valve. Inspect 2, 4; replace 12, 20.
  • Crankcase inlet air cleaner. Clean 2, 4, 12; replace 20.
  • Carburetor passages. Inspect 4; clean 12, 20.
  • Engine oil drain. Inspect 2; replace 4, 12, 20.
  • Engine oil filter. Inspect 2, 4; replace 12, 20.
  • Radiator fill & level. Inspect 2, 4, 12, 20.
  • Engine fuel filter. Inspect 2, 4; replace 12, 20.
  • Carburetor choke. Inspect 2; clean 4, 12, 20.
  • Carburetor fuel passages. Inspect 2, 4. Clean 12, 20.