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OTIS S-71 GOLF CART

TECHNICAL INFORMATION

Jim Kaness

Revised 4/10/2005

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Содержание S-71

Страница 1: ...OTIS S 71 GOLF CART TECHNICAL INFORMATION Jim Kaness Revised 4 10 2005 ...

Страница 2: ... initiative and the responsibility for its content is mine alone No official Otis S 71 technical or maintenance manual has been located Except for the sales brochure excerpt on page 3 the text drawings and photographs in this document are my own work from my own reverse engineering done on my own S 71 and comparison with other S 71 s available for inspection Despite 40 odd years of electronics eng...

Страница 3: ...oaster Company who manufactured a full line of electric and gasoline powered vehicles for use off the public roads on airports factories farms and ranches and golf courses In 1976 Otis sold the Westcoaster Otis product line to EVA Chloride who then was engaged in development of electric vehicles for highway use In 2005 many of these S 71 golf carts are still in use EXCERPT FROM WESTCOASTER BROCHUR...

Страница 4: ...d I have arbitrarily labeled them 1 through 4 for correspondence with the diagrams on the following pages Terminals 1 and 2 go to the field winding Terminals 3 and 4 go through brushes to the armature Brushes are accessible by removing the rubber plugs next to the terminals Most electric motors have the field and armature connected in parallel When motors are used for propulsion the field and arma...

Страница 5: ...T RM and RB are used to short out various parts of the resistance for speed control The accelerator as it is pressed offers OFF and positions sequentially labeled by me A slowest B C and D fastest With any one of the motor wires disconnected and key ON you can hear the solenoids turn ON as the accelerator is depressed through its range The pushrod between the accelerator pedal and the switches can...

Страница 6: ... to the armature winding NOTE The resistors shown are a fraction of an Ohm each and will measure zero Ohms with the usual bench multimeter MOTOR 1 MOTOR 3 MOTOR 4 36V BATTERY NEGATIVE FORWARD MOTOR 1 TO MOTOR 3 AND MOTOR 4 TO BATTERY NEGATIVE REVERSE MOTOR 1 TO MOTOR 4 AND MOTOR 3 TO BATTERY NEGATIVE REVERSING SWITCH MOTOR 2 36V BATTERY POSITIVE LT LB RT RM RB SOLENOID HIGH CURRENT CONTACTS ARE SH...

Страница 7: ...forward The MOTOR 4 connection is at the top The four unused bolt connections are only there to help the switch contacts slide smoothly over them to the intended connections MOTOR 4 MOTOR 1 MOTOR 3 BATTERY NEGATIVE 36 VOLTS BATTERY NEGATIVE TO SOLENOID CONTROL CIRCUIT low current schematic ...

Страница 8: ...ne of the solenoids is energized The drawing shows the switch having energized LB and LT for the slowest of the four speeds PLUS 18 VOLTS From center of 36V battery bank MINUS 18 VOLTS AND MINUS 36 VOLTS From Fwd Rev Switch LT LB RT RM RB ACCELERATOR SWITCH faster speed Two Micro Switches on Fwd Rev Switch Assembly Key Switch 20A Inline Fuse 20A Fuse on Fwd Rev Switch Assembly 20A Meter Brown From...

Страница 9: ... BATTERIES CAN WELD JEWELRY OR TOOLS THAT MAY ACCIDENTALLY SHORT ONE OR MORE OF THESE BATTERIES TO ENSURE YOUR SAFETY REMOVE RINGS AND WATCHES FROM HANDS AND ARMS AND WRAP ALL TOOL HANDLES WITH TAPE WARNING THESE BATTERIES CONTAIN SULFURIC ACID IF THIS ACID CONTACTS SKIN EYES OR OTHER BODY PARTS IMMEDIATELYFLUSH WITH LOTS OF WATER BATTERY MAINTENANCE Periodically check the fluid level in the batte...

Страница 10: ...teries with the seat raised Top of the page is the passenger side of the S 71 Left side of the page is toward the front of the S 71 GE 36 VOLT SERIES MOTOR 12V to Lights 36V to LB 36V to Fwd Rev Switch 18V to All Solenoids EXTERNAL CHARGER INPUT Viewed From Front ...

Страница 11: ...nput and allows charging for the desired number of hours to prevent overcharging The ammeter confirms that charging is taking place The transformer and diodes may be accessed by removing the glove box in the dash The glove box mounts with two bolts and tapped L brackets that grip behind the dash To remove unscrew the two bolts about 8 turns each It should then be possible to wiggle the glove box f...

Страница 12: ... may be used for charging the batteries Mine is a Club Car model 10470 Solid State Fully Automatic charger LIGHTS added The front and rear lights use 12 volts from two of the 6 volt batteries as shown This wiring has a 5 ampere fuse for safety An SPST toggle switch on the dash controls the lights BATTERY STATE OF CHARGE METER added This expanded voltmeter is widely available in 2005 at golf cart s...

Страница 13: ...of the motor shaft The brake pedal is attached to a flexible cable the other end of which pulls on the shoe through a spring Pushing the brake pedal further engages a pawl that holds the brake ON as a parking brake The brake pedal is also interlocked with the accelerator pedal Simply pushing on the accelerator pedal will release the parking brake An adjusting nut and locking nut are provided where...

Страница 14: ...and then used a floor jack under the rear axle to raise the axle until the shocks could be fastened without tension The rubber bushings for the shocks may be replaced with HELP part number 31018 or Napa part number 650 1113 FRONT SUSPENSION Front suspension on each side consists of a flat single leaf spring and a flat half leaf and shock absorber The rear end of the leaf spring and half leaf are s...

Страница 15: ...h a large opening for the axle and through which the bearing may be viewed To replace the hub align the splines of the hub and rear axle and push on Replace the castle nut and tighten until it is tight then back off the nut until the cotter pin can be inserted through the castle nut and axle and locked in place Then replace the wheel The wheel lug nut torque is unknown to me but I use a 3 8 hand r...

Страница 16: ... type self retaining speed nut on the inside lip behind the fiberglass When the bolts are removed lift up on the panel about inch so the bottom lip clears the fiberglass The panel may then be pulled forward a few inches for access to the components mounted on it The heavy battery cables and studs on the reversing switch may hang up on the fiberglass but a little patience and care will free the pan...

Страница 17: ... Page 251 3 I C S Reference Library 4 volumes Volume Electric Railways Interior Wiring 1904 International Textbook Company Scranton Section 24 Page 16 INTERESTING WEBSITES SUBJECT WEBSITE LINK Electric Vehicle History www econogics com ev evhista htm EVA Chloride See listing at www econogics com ev evhiste htm Otis Elevator Company www otis com Otis Elevator Company See listing at www econogics co...

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