GMC 1975 Motorhome Operating Manual Download

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Summary of Contents for 1975 Motorhome

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Page 2: ...dfollow the recommendations to help assure the most enjoyable and troublefree operation of your vehicle When it comes to service remember that your GMC MotorHome Dealer knows your vehicle best and is interested in your complete satisfaction Return to him for service and any other assistance you may require GMC Truck and Coach maintains a number of Zone Offices throughout the country Should you hav...

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Page 7: ... MAXIMUM TOTAL WEIGHT AT GROUND 11 700 LBS Curb weight is the weight of the vehicle without driver passenger or cargo but does include fuel and coolant Vehicle Loading 1 MAXIMUM FRONT AND REAR AXLE WEIGHTS AS MANUFACTURED The weight of the load must be properly dis tributed over both the front and rear axles although not necessarily evenly The plate shows the maximum weight that the front axle can...

Page 8: ... vehicle The GVW must not ex ceed the GVWR and the front and rear weights of the loaded vehicle must not exceed the front and rear GAWR s CAUTION When using your vehicle to transport luggage or other cargo it is recom mended that the articles Ire secured in place This precaution will help prevent such items from becoming dangerous projectiles in she event of an accident EFFECT ON WARRANTY Your New...

Page 9: ...nt 8 Be sure all LP gas controls on furnace range oven and optional gas electrical refrigerator are turned off Check that all interior stowage is securely held 10 Check that all lights and switches are set in positions suitable for travel 11 Position driver s seat for comfort 12 Check that driver s and front passenger s seat and any other swivel mounted seats are locked in position 13 Check adjust...

Page 10: ...o you at the time of delivery For your protection Record the numbers on the key envelope and discard the key plugs Keep the key envelope in a safe place such as your wallet NOT IN THE VEHICLE In the event the original keys are lost dupli cates can be made by your dealer or a locksmith using the key code information When leaving the vehicle unattended remove the keys and lock the entrance door The ...

Page 11: ...NDER Always lock entrance door when driving for greater security in the event of an accident to help keep chil dren from inadvertently opening door and for security against entry by un welcome persons while momentarily stopped LAP BELTS Your GMC MotorHome is equipped with lap belts in the driver and front passenger seating Entrance Door Latch VIEW FROM OUTSIDE VEHICLE position s as well as certain...

Page 12: ...nt of an Qrcident never use the same belt for mare than one person at a time avoid wearing belts in o twisted condition do not allow belts or hardware to become pinched between The seat structural metallic member or in the door 6 LAP BELT INSPECTION Periodically inspect belts buckles retractors and anchors for damage that could lessen the effectiveness of the restraint system s Keep sharp edges an...

Page 13: ...AUTIONS 1 Trailer brakes are required on trailers over 1 000 lbs loaded weight 2 DO NOT tap into vehicle s hydraulic brake system if operation of the trailer brake system requires more than 0 02 cu in of fluid displace ment from the vehicle s master cyl inder The vehicle s master cylinder fluid capacity will not be sufficient to operate both vehicle and trailer brakes under all conditions of use i...

Page 14: ... unob structed 9 Check and empty holding tank INSIDE VEHICLE 1 Check operation of optional Power Level System 2 Check gasoline supply 3 Check transmission fluid level 4 Check power steering fluid level 5 Check operation of windshield wipers and windshield washers 6 Check operation of brakes 7 Check operation of interior lights 8 Check all appliances and fixtures for proper operation 9 Check operat...

Page 15: ...CH FOR THEM For continuing satisfaction keep your vehicle all GM General Motors Parts are identified by one of these trademarks 131 The MotorHome power to weight ratio is lower than that of the average automobile Therefore it is essential to compensate for less acceleration when moving into traffic or when passing another vehicle NEW VEHICLE OPERATING SPEEDS Driving speeds for your new vehicle sho...

Page 16: ...GMC MOTORHOME NOTES ...

Page 17: ...d areas such as garages any more than needed to move vehicle in or out of area When vehicle is stopped in an UNCONFINED area with the engine running for any more than a short period of time adjust heating or cooling system to force outside air into the vehicle as follows 1 On vehicles not equipped with automotive air conditioning set fan to medium or high speed and upper control lever to any posit...

Page 18: ...al operating position START Permits engagement of starter NOTE The anti theft steering column lock is not a substitute for the parking brake Always set the parking brake when leaving the driver s seat unattended If difficulty is experienced in turning the igni tion key and lock knob to unlock the ignition attempt to turn the steering wheel as hard as possible in the direction the wheels are turned...

Page 19: ... times then remove foot from accelerator pedal and crank engine If engine still does not start fully depress the accelerator pedal and hold to the floor while cranking the engine If the engine has been flooded with gasoline it may start to run but not have enough power to keep running In this case continue 13 Transmission Shift Indicator and Speedometer cranking with the accelerator pedal fully de...

Page 20: ...on slippery surfaces with vehicle moving abrupt engine braking action could cause the front wheels to skid possibly leading to loss of vehicle con trol FORCED DOWNSHIFT When additional acceleration is desired to pass moving ve hicles or to climb steep grades at speeds between approximately 35 and 65 MPH the transmission can be downshifted by depress ing the accelerator pedal completely to the floo...

Page 21: ...le to the desired speed and momentarily push in the engagement button take your foot off the accelerator and this speed will be maintained TO RESET AT A FASTER SPEED Ac celerate the vehicle to the desired higher speed push in the engagement button fully and release slowly TO RESET AT A SLOWER SPEED Depress the engagement button fully and HOLD Allow vehicle to decelerate When vehicle reaches desire...

Page 22: ... that the vehicle will r Vehicle Floor Controls FLOOR CONTROLS 16 f pull to the right or lefi Applying the brakes lightly will indicate whether they have been so affected To dry them quickly lightly apply the brakes while maintaining a safe forward speed with an assured cleor distance ahead until brake performunce returns to normal On your vehicle if power assist to the brakes is interrupted due t...

Page 23: ...t on the brake pedal when not intending to brake can cause abnormally high brake temperatures excessive lining wear and possible damage to brakes REMINDER Front disc brakes have a built in wear indicator that is designed to make a high frequency squealing or cricket like warning sound when the linings are worn to where re placement is required The sound will occur intermittently or continuously wh...

Page 24: ...peedometer is designed to light up when the headlights are on high beam HEADLIGHT FLICKER The headlight circuits are protected by a circuit breaker in the light switch An overload on the breaker will cause the lights to flicker on and off or in some cases to remain off If this condition develops have your headlight electrical circuit checked immediately 1 WINDSHIELD WIPER CONTROL 7 OIL PRESSURE GA...

Page 25: ...ngine warmed up to normal operating temperature minimum pressure at idle should be slightly above the L graduation 8 PSI At normal operating speeds minimum pressure should be between the second and middle graduations 35 PSI Should the pres sure drop below these minimums stop the en gine immediately and check the cause of the low 19 oil pressure This could be the result of a danger ously low oil le...

Page 26: ... prop erly closed LOW AIR The low air light is designed to warn the driver that air pressure in the rear suspension system is abnormally low See Emergency Operation page 26 later in this section PARK BRAKE As a reminder the PARK BRAKE brake reminder light is de signed to glow whenever the parking brake control is not fully released and the ignition is on LOW FUEL Optional Light The low fuel warnin...

Page 27: ...L SELECTOR SWITCH The fuel selector switch located below the warning light cluster has two positions FUEL MAIN and FUEL AUX This switch allows the driven to change the fuel pick up and fuel gauge sending unit from the main tank as it 2 1 Fuel Tank and Battery Switches goes empty to the auxiliary tank which will normally contain 7 to 9 gallons of fuel It is recommended that any time the fuel system...

Page 28: ...nd HI The fan will not operate unless the top lever has been moved from the OFF position and in order 22 Automotive Heating System Controls with Type 2 Fan Switch to operate the fan in the HI position the engine must be running TYPE 2 FAN The fan switch has four positions LO and three blower speeds ranging to HI Fan will operate whenever the key is in the RUN or ACCESSORY position In order to oper...

Page 29: ...ging to HI Fan will operate whenever 23 Automotive Air Conditioner Controls with Type 2 Fan Switch the key is in the RUN or ACCESSORY position In order to operate the fan in the HI position the engine must be running OFF A C VENT HEATER DEF With the lever in the OFF position the system is off With the lever in the A C position and the RECIRC COLD HOT lever at RECIRC position the air conditioning s...

Page 30: ...dition to the manual controls this radio provides five push buttons with which to auto matically select pre set stations To pre set pull the push button out as far as it will go tune in the desired station manually and then push the button in Repeat this operation for each push button AM FM RADIO In addition to providing standard AM recep tion this set permits you to receive clear static free FM b...

Page 31: ...tone controls as desired 3 To change program track push in volume control knob and release player will index to next track 4 Push in the eject button to remove tape cartridge from player 25 AM FM Stereo Radio with Tape Deck Tape Installed Cleaning and Care Every 100 hours of operation or if tape slips and runs slowly the capstan revolving metal post head and tape guide should be cleaned with a cot...

Page 32: ...4 inches below normal ride height In order to maintain a desired height turn indicator on knob to HOLD Power Level System Controls 26 TRAVEL Whenever driving vehicle on high ways or improved roads place indicator line in TRAVEL position This will automatically maintain a constant ride height at the rear ap prox 8 inch ground clearance at rear A re minder light in the dash panel is designed to ligh...

Page 33: ...reservoir at a local gas station D NOT EXCEED 120 PSI MAINTENANCE No routine maintenance is required on the Power Level System Refer to SERVICE AND MAINTENANCE section later in this manual for Rear Suspension Maintenance For continuing satisfaction keep your vehicle all GM General Motors Parts are identified by one of these trademarks GM I V Delco ...

Page 34: ...GMC MOTORHOME NOTES ...

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Page 36: ...l power source the power cord should be plugged into the motor generator receptacle within the external utilities 30 Light Switch Panel Typical compartment This connects the motor gener ator to the MotorHome electrical system If the vehicle is not equipped with a motor generator simply coil the power cord neatly within the external utilities compartment Your MotorHome s external power cord con tai...

Page 37: ...lding tank sending unit because final certification of Monitor Panel and Motor Generator Switch 3 1 this unit has not been received Therefore hold ing tank gauge may not register These gauges are activated by a ROCKER switch located on the face of the panel This switch has three positions ON OFF and MOMENTARY ON An indicator light glows when gauges are operating ONAN MOTOR GENERATOR IMPORTANT Befo...

Page 38: ...TART STOP switch is the HOUR METER The HOUR 32 METER indicates total amount of hours motor generator has operated This gauge will aid in determining when the motor generator should receive periodic inspections maintenance and service parts replacements in conjunction with the Maintenance Schedule folder HIGH TEMPERATURE OPERATION Make sure that nothing obstructs air flow to and from the unit Keep ...

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Page 51: ...not start for approximately two minutes IMPORTANT Before operating the furnace see carbon monoxide caution at the beginning of this section The furnace is located in the compartment under the kitchen sink and has 30 000 BTU capacity The furnace s electrical system is operated on 12 volt DC only SEQUENCE OF OPERATION Whenever operating the furnace the window above it should be fully closed to help ...

Page 52: ...ve fully located under sink at right side of furnace Do not attempt to operate furnace with valve partly opened as proper operation depends on valve being fully open 3 Set thermostat to desired setting furnace will energize and continue to run until thermo stat is satisfied or is turned to a lower setting NOTE Refer to FURNACE OPERATING TIPS if furnace fails to ignite SHUTTING OFF FURNACE 0 To shu...

Page 53: ...witch 3 Insufficient primary air 47 Furnace Primary Air Adjustment NOTE Before pressing the reset button to reset the control circuit a wait of 5 minutes is re quired after the furnace has stopped before the thermal relay will properly reset PRIMARY AIR ADUSTMENT Access to the burner assembly to adjust pri mary air is located at the bottom right side of the furnace compartment by removing access c...

Page 54: ...ble leaves and push in supports Slightly raise the aisle end of the table and Double Dinette Dining Position Dinette Table Disengaging Leg FURNITURE 48 depress folding leg lock and fold attached leg under all the way Continue to raise the table end until it be comes disengaged from the wall 0 Place table on floor between dinette seats NOTE There are two handles located under seat cushion one at ea...

Page 55: ...ed in the same manner as the seats in the driver s com partment CAUTION Check that all swiveling seats are locked in position before driving off If any seat swiveled during an accident the occupant may be more likely injured 49 Front Davo Converted to Bunk Beds SIDE FACING SETTEE The rear side facing settee is adjustable and provides a normal sitting position two inter mediate sitting positions an...

Page 56: ...Preparing Settee for Sleeping For continuing satisfaction keep your vehicle all GM General Motors Parts are identified by one of these trademarks GM A V IDelco Settee in Sleeping Position ...

Page 57: ... the auxiliary living area battery After use switch is designed to return to the BAT NORMAL position 0 A vehicle with both batteries discharged may be started by using energy from a battery in another vehicle called Jump Starting JUMP STARTING Jump starting may be dangerous and should be attempted ONLY if the following two condi tions are met If they are not we strongly rec ommend that you leave t...

Page 58: ...cket matic transmission in PARK in both vehicles don t let vehicles touch and turn ignition key to LOCK in vehicle with discharged battery Neutral and OFF in vehicles with manual transmission Also turn off lights heater and all unnecessary electrical loads 3 Attach one end of a jumper cable to the positive terminal identified by a red color or P on the battery case post or clamp of the battery in ...

Page 59: ...TIONS 1 Follow jacking instructions in order to re duce the possibility of serious personal injury 2 The jack is designed for use only when changing wheels 3 Never get beneath the vehicle when using jack 4 Do not start or run engine while vehicle is on jack INSTRUCTIONS Park level su ace and set parking brake firmly Set transmission in PARK Activate Hazard Warning Flasher Block front a l rear of t...

Page 60: ...pment specifically designed for this purpose following the instructions of the towing equipment manu facturer A separate safety chain system must be used For such towing the steering must be un locked transmission in neutral and the parking brake released Attachments must be to engine front crossmember Do not attach to bumpers or associated brackets Remember that power brakes and power steering as...

Page 61: ...injury and severe damage may result from excessive wheel spinning including tire disintegration or differen tial failure EMERGENCY EXIT The rear window of the vehicle in an emer gency can be used as an exit To use the emer gency exit pull the ring located at the top center of the rear window until window seal is re moved and then push the glass out of the 1 owing Vehicle 55 Emergency Exit Pull Rin...

Page 62: ...reful of possible broken glass on ground when exiting from the vehicle FIRE EXTINGUISHER The dry chemical fire extinguisher is located in the vehicle closet It is recommended that you be familiar with the operating instructions located on the fire extinguisher For continuing satisfaction keep your vehicle all GM General Motors Parts are identified by one of these trademarks A V Delco ...

Page 63: ...ealerships APPEARANCE CARE CARE AND CLEANING OF INTERIOR GENERAL INFORMATION G M CLEANERS 57 LAP BELT CARE Clean only with mild soap solution and luke warm water Do not bleach or dye belts since this may severely weaken belts INTERIOR GLASS The interior glass surface should be cleaned on a periodic basis for continued good visibility A commercial household glass cleaning agent containing ammonia w...

Page 64: ...y or may cause damage to the interior Therefore when cleaning the interior do not use volatile cleaning sol vents such cps acetone lacquer thinners enamel reducers nail polish removers or such cleaning materials as lovndry soups bleaches or reducing agents except os noted in she adjacent fabric cleaning in structions an stain removal Never use Carbon tetrachloride gasoline or naphtha for any clean...

Page 65: ...with dull knife Moisten with fabric cleaning fluid and scrape again 59 FRUIT STAINS COFFEE LIQUOR WINE SOFT DRINKS ICE CREAM AND MILK Wipe with cloth soaked in cold water If neces sary clean lightly with fabric cleaning fluid Soap and water is not recommended as it might set the stain CATSUP Wipe with cloth soaked in cool water If further cleaning is necessary use a detergent foam cleaner GREASE O...

Page 66: ...uce the possibility of the windshield becom ing scratched and will assure clear vision under adverse driving conditions EXTERIOR APPEARANCE CARE 60 POLISHING AND WAXING Even though the acrylic enamel on your vehicle is durable under certain conditions it may be advisable to wax or polish your vehi cle to provide added protection Calcium chloride and other salts road oil and tar tree sap chemi cals...

Page 67: ...by a competent serviceman For owner convenience a separate maintenance folder has been provided with your vehicle which contains a complete schedule and brief f 0 LP GAS DOOR SERVICE AND MAINTENANCE CAUTION FUEL TANK FILL CAP DOOR MAINTENANCE SCHEDULE REFRIGERATOR ACCESS DOOR LEFT SIDE explanation of the safety emission control lubri cation and general maintenance it requires The maintenance folde...

Page 68: ...icle maintenance requirements automotive battery engine oil fill radiator radiator cap coolant recovery tank and the air conditioner receiver dehydrator sight glass op tional Items that can be checked or filled through the left access door are the windshield washer reservoir brake master cylinder engine oil dipstick and the air compressor Be sure to secure the access doors after clos ing them by t...

Page 69: ...ght ened by hand or screwdriver The cover is de signed to be secured at the front by a retain ing lip Engine Compartment 63 7 B 9 10 Engine Oil Fill Hose and Tube Assembly 1I POV V21ve 12 Air Conditioning Compressor Optional Distr3butar Thernial Vacuum Switch Carburetor Choke Coil Cover To remove the engine cover loosen the secur ing bolts and lift up using the wire loops To install the engine cov...

Page 70: ... the engine must run with the cover off for maintenance purposes care should be taken to assure that the vehi cle s interior is well ventilated ENGINE COMPARTMENT LIGHT The optional engine compartment light lo cated behind right front access door is turned ON when access door is opened The light at tached to a 25 foot cord may be removed from engine compartment for use as necessary Rear hoisting m...

Page 71: ...hange intervals assure you of continued proper lubrication of your vehicle s engine RECOMMENDED SAE VISCOSITY Single grade oils are preferred however mul tigrades such as SAE 1OW 30 or IOW 40 are also acceptable SAE 5W 20 oils are not recommended for sustained high speed driving SAE 5W 30 oils if available may be used if extreme low temperatures are anticipated LUBRICATION DETAILS 65 The regular u...

Page 72: ... FITTINGS t L H TIE ROD 2 FITTINGS R H TIE ROD 2 FITTINGS 1 FRONT SUSPENSION UPPER AND LOWER BALL JOINTS IL 2 FITTINGS RIGHT AND LEFT SIDE OF VEHICLE Location of Chassis Lubrication Fittings 00FRONT STEERING COLUMN TO GEAR SHAFT ASSY 2 FITTINGS STEERING RELAY LEVER 1 FITTING ...

Page 73: ... cated under the engine access cover on the left side of the engine Use only automatic transmission fluids identi fied with the mark DEXRON II These fluids have been specially formulated and tested for use in your automatic transmission and are available from your GMC MotorHome dealer or local service station Check the fluid level at each engine oil change period To make an accurate fluid level ch...

Page 74: ... install pan Torque attaching screws to 12 foot pounds 6 Add four 4 quarts of DEXRON II automatic transmission fluid and check fluid as noted above 7 v o FIPs DRIVE FINAL DRIVE LUBRICANT REPLACEMENT 1 Remove 10 cover attaching bolts Have a drain pan ready as lubricant will begin to drain as bolts are loosened 2 Remove cover and allow lubricant to drain Discard old gasket 3 Using a new cover gasket...

Page 75: ...ICING DETAILS ENGINE COOLING SYSTEM The recovery type cooling system is standard on all vehicles covered by this manual The coolant expands with rising temperature and the overflow is collected in the recovery tank When the system temperature drops the coolant is drawn back into the radiator The cooling sys tem has been filled at the factory with a high quality inhibited year around coolant that m...

Page 76: ...C for coolant recovery systems and specified for your vehicle 4 Tighten hose clamps and inspect all hoses Replace hoses every 24 months earlier if 70 Draining and Refilling Radiator Drain Plug CAUTION swollen checked or otherwise deteriorated 5 Clean frontal area of radiator core and air conditioning condenser The cooling system should be drained flushed and refilled using the following recommende...

Page 77: ...coolant loss or to provide additional protection against freezing at temperatures lower than 20 F 35 F in Canada NOTE Alcohol or methanol base coolants or plain water are not recommended for your vehicle at any time 71 THERMOSTAT The cooling system is protected and con trolled by a thermostat installed in the engine coolant outlet to maintain a satisfactory operat ing temperature of the engine Thi...

Page 78: ...one half turn counterclockwise to clear the first set of tangs from the slots inside the filler neck This will allow any residual pressure to escape Pull the cap outward and rotate one quarter turn counterclockwise to clear second set of tangs Then remove the cap To install reverse this procedure NOTE If the gas cap requires a replacement only a cap with the same features should be used Failure to...

Page 79: ...y should be cleaned every 12 000 miles or once a year Use a brush and a solution of ammonia and water or baking soda and water Flush off with clear water After cleaning apply petroleum jelly or petrolatum to battery cable terminals to help retard corrosion 3 If battery performance becomes question able see your dealer For full voltage requirements a Delco Ener gizer is recommended at replacement t...

Page 80: ...roove of each adjusting screw then pull for ward Disconnect wiring at the base of unit and separate the Sealed Beam assembly by remov ing the two retaining screws Install Sealed Beam unit in reverse order of removal 74 GL C VF C0MP R1frAF jI EXTERIOR LIGHTS W Chassis Fuse Block All exterior lights can be easily replaced by removing lens pushing bulb in slightly and turn ing counterclockwise except...

Page 81: ...pressure wear and damage The follow ing information will assist you in properly caring for your tires 75 GMC MOTOR HOME TIRE PRESSURES FOR 8 7516 5 LOAD RANGE D FOR LOADS UP TO VEHICLE CAPACITY FRONT REAR PSI c01 D 60 60 FOR SUSTAINED SPEEDS IN E XCE5S OF 65 MPH INCREASE TIRE PRESSURES 10 PSI COLD NOTE T0PpuF WHEEL NUTS TO 2511 POUND FEET AT 500 MILES AFTER EACH WHEEL REMOVAL Inflation Pressure Ti...

Page 82: ...y and bias ply steel belted tires should not be mixed on the same vehicle It is recommended that new tires be installed in pairs opposite each other preferably the front wheels When replacing only one tire it should be paired with the tire having the least wear to equalize braking traction Replacement Wheels Wheels must be replaced if they become bent are heavily rusted if the lug nuts won t stay ...

Page 83: ...improper wheel alignment wheels being out of balance or poor driving habits Under inflation over infla 77 2 Tightening Wheel Stud Nuts Wheel Stud Tightening Sequence tion incorrect toe or camber and fast cornering produce different types of abnormal wear which can be diagnosed by your dealer To equalize wear it is recommended that the tires be rotated every 6 000 miles or sooner if irregular wear ...

Page 84: ...of the bearing must be done with the wheel off the floor and rotating the wheel while tightening nut At this time make the torque readings as follows 1 Tighten adjusting nut with a torque wrench to 25 30 foot pounds with wheel rotating to en sure that all parts are properly seated and threads are free 2 Back off nut one half turn Re tighten nut finger tight 3 If unable to install cotter pin at fin...

Page 85: ... a constant frame height NOTE Ride height is measured from top of elongated slot in frame rail to ground level Tire inflation should be checked prior to making any ride height adjustments The rear suspension can be manually ad justed for variations in load distribution Adjust ment is made at the adjustment nut on the height control valve arm 1 Drain air reservoir under front of vehicle to remove m...

Page 86: ...he control valve is the regulator valve It should not be tampered with To fill the tank drive the MotorHome to an LPG Dealer DO NOT REMOVE THE TANK The Dealer must use a P O L adapter to fill the tank The adapter is to be inserted into the filling connection When liquid appears at the outage valve the tank is full Always refill empty LP gas tank as soon as possible Appliances will stop working whe...

Page 87: ...IONS later in this manual The main circuit breaker panel also located in the living area electrical compartment con tains circuit breakers that are designed to snap to the OFF position in the event of an overloaded 120 volt circuit Once the cause of the overload is corrected the circuit breaker switch may be moved back to the ON position The 120 volt 12 volt power converter lo cated in the living ...

Page 88: ...REAR ROOF VENT FAN LPG COMPARTMENT LIGHT L H IEADING LIGHT LPG SENDER UNIT WATER TANK 5CN5IR UNIT WATER PUMP FURNACE AUXILIARY BLOWER li R H FRONT LIG14T 2 58A BATH LIGHT 64A REAR R H READING LIGHT L 54A TOTAL 110AMP IJA REFNGERAtUR 8 04A HALL LIGHT 2 85A Or COMPARTMENT LIGHT I AdA TOTAL 14 32 AMP CIRCUIT BREAKER 03 PQR H LIGHT 1 41A FLOOR LIGHT 1 18A_ GALLEY LIGHT 7 88A WATER PUMP 3 OOA SYSTEMS M...

Page 89: ... WATER HtAT R RECEPTACLE ITEM PART NAME NO 1 MAIN PANEL BOX 2 8 4 WIRE CORD TYPE 50 W PLUG 3 WIRE 12 2 W GROUND WIRE CIRCtFLT BREAKE11 PANEL 4 SINGLE RECEPTACLE CIRCUIT R1 CIRCUIT 47 CIYCWF x3 CIRCUFI u I CIRCUI T 5 5 OUTLET BOX FRONT AIR WATER HEATER HALL OVER VACVVm v nv k t 6 DUPLEX RECEPTACLE COND RECEPY PECEPT ILECEPT _0 JC z F 7 OUTLET PLATE CONV ERTER DIEDROOm 8 SWITCH RECEPTACLE RECEPT REC...

Page 90: ...e pulled out on its slide rail to gain access OIL FILTER Change the crankcase oil filter at least every 200 hours The filter is located on the right side of the unit facing the compartment Remove by turning counterclockwise with a filter wrench Before installing new filter coat the gasket on the filter s base with a light film of new oil Install by turning clockwise until a light friction is noted...

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Page 92: ...hing it until unit is running at 1500 RPM Before final adjustment allow the engine to warm up Make the idle adjustment under no load Open the main fuel adjustment until the engine runs smooth under acceleration with no load Slightly more fuel may be needed open about 1 a turn further when sudden load is applied or if operating in very cold weather 86 If the engine develops a hunting condition alte...

Page 93: ...valve sheared off due to trying to flush toilet when water is frozen in valve SOLUTION Replace ball valve Toilet must be re moved 87 RECIRCULATING TOILET Routine maintenance is not required on the recirculating toilet other than recharging which is described in OPERATION OF LIVING AREA FACILITIES section earlier in this man ual If a problem occurs check and make the appropriate correction 1 PROBLE...

Page 94: ...erfill the overflow will back up through the bathroom shower drain 1 Be sure the holding tank valve is closed It is located on the left hand side of the vehicle just behind the left rear tandem tire 2 Remove dump hose extension from the storage tube inside rear bumper 3 Disconnect dump tube retaining strap mounted to center of rear crossmember Remove dust cap from pump tube 4 Join dump tube extens...

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Page 99: ...orage is lengthy 6 months or more n Crack one window for ventilation close all others as well as roof vents For continuing satisfaction keep your vehicle all GM General Motors Parts are identified by one of these trademarks GM r1 V Delco 93 o Start and run engine weekly for approxi mately 20 minutes If very low temperatures are expected the batteries should be removed and stored in a warmer area p...

Page 100: ...GMC MOTORHOME NOTES ...

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Page 102: ...iary Living Area Bat Extra Duty Catalog No 758 E5000 Catalog No R91 Rated 3350 Watts 0 F Extra Duty Catalog No 758 Rated 4500 Watts 0 F Radiator Cap pressure opening Thermostat Power Converter Output Furnace Forced Air Roof Mounted Air Conditioning CAPACITIES 11 2 Qt 62 0 Lbs 40 Gal 32 Gal 6 Gal ENGINE BATTERIES MISCELLANEOUS 96 Two 25 Gal Tanks 231 2 Qts 5 Qts Including Filter 6 Qts Drain Refill ...

Page 103: ...Do not use fuses of higher amperage rating than those speci fied below or property damage may result 97 Name on Usage Fuse Block Fuse Type Auxiliary Battery Switch i Radio Aux Bat Radio AGC 10 Tape Player Heater Controls Htr A C AGC 25 Air Conditioner Side Marker Lights I D Clearance Lights Tail Lights Tail Dome SFE 20A Dome Lights License Light Stop Lights Hazard Warning Lights Dir Sig Haz Stop S...

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Page 105: ...nstrument Cluster Lights 2 194 Speedo Cluster Lights 2 194 Dome Lights 2 211 Radio Dial AM FM Stereo Tape 1 566 Radio Dial Exc AM FM Stereo Tape 1 Im Heater Control 1 1895 Bore 31 e in Stroke 25 s in Oil Capacity 3 Qt With Filter Change 31 z Qt Spark Plug Type AC R46S Spark Plug Gap 020 in Breaker Point Gap 025 in Ignition Timing Cold or Static 26 BTDC Tappet Adjustment Engine Cold Intake 003 in E...

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Page 108: ...GMC MOTORHOME NOTES ...

Page 109: ...l assistance the matter should be called to the attention of the Zone s Customer Services Depart ment and the following information provided Your name address telephone number Vehicle Identification Number Dealer s name and location Vehicle s delivery date and mileage 0 Nature of problem STEP THREE Contact the Customer Services Manager GMC Truck Coach Division 660 South Blvd East Pontiac Michigan ...

Page 110: ...N W Cie 0 I CC Cie W F LU Z 0 N ...

Page 111: ...LOS ANGELES 8155 Van Nuys Blvd Suite 1030 Panorama Towers Panorama City Calif 91402 873 7554 Area Code 213 MEMPHIS 3495 Lamar Ave Box 18714 Holiday City Sta Memphis Tenn 38118 365 9210 Area Code 901 MINNEAPOLIS 3001 Broadway N E Minneapolis Minn 55413 331 4282 Area Code 612 NEW YORK 780 Dowd Avenue Elizabeth N J 07207 354 8200 Area Code 201 State of Alaska is serviced by the MEXICO ZONE OFFICE 105...

Page 112: ... 5053 Calgary Alberta T2P 2M7 Don Mills Ont M3C 1 11 REGINA 581 Park Street 306 643 2224 OTTAWA 875 Belfast Road 613 237 5051 Regina Sask S4P 3E9 Ottawa Ont K1G OZ4 WINNIPEG 1345 Redwood Avenue 204 633 1080 MONTREAL 5000 Trans Canada Hwy 514 697 9160 Winnipeg Man R2X OY9 Pointe Claire Quebec H9R 4R2 LONDON 1991 Oxford St E 519 455 2400 MONCTON 653 St George Street 506 854 1500 London Ontario N6A 4...

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Page 114: ...nergy is wasted as heat in braking Energy in the form of gasoline is also needed to acceler ate back to driving speed LUBRICANTS A properly lubricated vehicle means less friction between moving parts Consult this manual and the maintenance schedule for the proper lubricants to use and the lubrication intervals AIR CLEANER Your vehicle receives its power from a mix ture of gasoline and air The air ...

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Summary of Contents for 1975 Motorhome

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GMC 1975 Motorhome, Operating Manual

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Summary of Contents for 1975 Motorhome

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