Instruments - Hansen Web Design
Contents
1. 1 1 2 573 per mile 6 16 x 4 ratio PRINTED IN UNITED STATES OF AMERICA Donated by John amp Susan Hansen For Personal Use Only2. AS TALIO ratio ratio CANESSA new axle ratio has been i changed NOTE Ifnoadapterin present hook NOTE a ne adapterin present pook E up disregard in calculations up disregard in calculations EXAMPLE MPLE Present adapter ratio 1 155 EXAMPLE a Old tire rev per mile 7 00 20 573 ld axle ratio 5 285 1 O e o ld axle ratio 5 285 New axle ratio 6 16 1 S New tire rev per mile 9 00 20 525 Present adapter ratio 1 155 AN New axle ratio 6 16 1 Formula is then i Formula is then 5 285 yy ace 1 081 r X 1 155 9909 oot 1 155 X 573 X 5 285 _ Required 525 X 6 16 adapter C 10084 rane To find 4 Tire rev F Loaded tire radius X 0 1 X Loaded tire radius y ma in inches A TO HCH Buna Cee eg ver gear p Adapter revolu adapter axle ratio X number teeth ratio tions if tire a ee per mile Deduct 1 for high pressure tires diameter 8 or 1 1 2 for balloon tires axle NOTE See CT 350 for tire radius ratio and specifications NOTE See CT 350 for tire radius speed EXAMPLE specifications ometer Loaded tire radius 9 00 20 18 9 drive and Constant figure 0 1 EXAMPLE driven Number of teeth in speed Constant figure 10084 gears are driven gear 14 Loaded tire radius of 7 50 20 tire known Axle ratio 6 16 1 Formula is then Number of teeth in speed 10084 drive gear 4 582 Formula is then 17 3 18 9 X 0 1 X 14 ells a Adapter Tire rev 582
3. Donated by John amp Susan Hansen For Personal Use Only INSTRUMENTS L LINE MOTOR TRUCK SERVICE MANUAL Ben age SECTION A Page Equipment for checking gauges ia AA ee aia o ee ee 3 Flexible shaft tachometer cece eee crete reve tee oh ba jan ad w fee Se by 4 Fuel gauge operation OA OR AE E cis and aa ta arse ass 1 2 General description cence eee See REESE RHEE EES DEG SES EOE we a 1 Method of checking gauges o oo ooo ooo ooooos o s a eii Ge es 3 4 Oil pressure gauge operation o oooo ooo o E a a are 2 Service instructions essare seide kii tas ee grata Be arpa aN ere se a e 1 Speedometer and odometer a Bea es GA oe RARA a OS Ww we at a ae 4 Tachometer repairing and lubricating A 4 Water temperature gauge operation a o oo ooo ooo oooo o o daa da ala ea ee 2 3 SECTION B 1 Speedometer adapter calculations ia ete ee dass ereo PRINTED IN UNITED STATES OF AMERICA Donated by John amp Susan Hansen For Personal Use Only Donated by John amp Susan Hansen For Personal Use Only EJ R LINE MOTOR TRUCK SERVICE dd ratty 4 Page 1 INSTRUMENTS COMBINATION STARTING AND IGNITION SWITCH R 110 to RF 210 Delo Remy No 1116501 When the switch key is turned to the left all accessories and gauges are ON except the ignition which is OFF When the switch key is turned half way to the right the accessories and ignition
4. ace dial and to record distance traveled by means of an odometer The speed ometer is driven through a flexible shaft con nected to a set of gears in the vehicle trans mission These gears are designed for the particular vehicle model and take into con sideration the tire size and rear axle ratio The flexible shaft which connects the trans mission driven gear to the speedometer con sists of an outer casing and inner core The odometer usually records up to 99 999 miles before it automatically returns to zero The extra wheel on the right side of the odom eter is known as the tenth dial replacing the old type trip odometer and records every tenth of a mile There are occasions when due to change in axle ratios or tire sizes it is necessary to make compensating corrections in the speed ometer drive gear For method of speedometer adapter calculations see following Section B s Instruments Tachometer A tachometer is installed ona vehicle to record engine r p m speeds and enables the driver to keep engine within efficient operating range The magnetic type tachometer is installed at the factory on all Super Red Diamond En gines It is driven bya flexible shaft connected to the vehicle distributor shaft by means of a drive joint or adapter and records the r p m from the distributor shaft onto the face dial through a magnetic field within the unit There are two additional types of tachom eters available namely
5. are both ON Turning the ignition switch key to the extreme right will engage the starting switch and complete the electrical circuit between the battery and the starting motor so that the pinion engages the flywheel ring gear and cranks the engine CTS 12 MARCH 1953 Supplemental pages for CTS 11 PRINTED IN UNITED STATES OF AMERICA Donated by John amp Susan Hansen For Personal Use Only Donated by John amp Susan Hansen For Personal Use Only L LINE MOTOR TRUCK SERVICE MANUAL INSTRUMENTS Tachometer Speedometer Fuel Ammeter s Qil Temperature Air pressure gauge pressure gauge gauge A 22497 Fig General Description Fig 1 illustrates location of instruments on dash panel Fig 2 illustrates the rear view of the same instruments and panel assembly as in Fig 1 The fuel gauge oil pressure gauge and water temperature gaugeare electrically oper ated and consist ofa sender and receiver dash unit Diagrams Figs 3 to9 inclusive illustrate the major parts of each unit and the principle of operation An optional source of supply of instruments is established at the factory and the new truck may be equipped with instruments that come to rest in the upper range when the switchis turned to OFF position In these in stances the details of operation of the unit are similar The illustrations will apply in either case except for direction of travel after switch is turned to OFF position Servic
6. ceiver creates an equal amount of heat there anda resultant bending of the dash receiver bi metal causing the pointer to show a low temperature reading As the water temperature rises its heat aids in bending the sender bi metal less heat is generated electrically the resultant bending of the bi metal in the receiver is less result ing in higher temperature readings Fig 8 The following service instructions apply to fuel level oil pressure or water tempera ture gauges IMPORTANT Do not disconnect instru ments with ignition switch ON as thereis dan ger of causing a short circuit which will dam age instruments Always turn ignition switch OFF before changing or working on instru ments NOTE If it is necessary to replace the receiver unit because it has been burned out then check wiring sender unit and condenser if any for a short and correct this condition otherwise new receiver unit will also burn out A short in the gauge circuit is easily rec ognizable because it will cause receiver unit to over read and in most cases beyond full scale Equipment Necessary for Checking Gauges l Onenewfueltank unit If thereis any ques tion about the new tank unit being correct then hook it up in series with a receiver unit known to be satisfactory and apply 6 volts of current Operate tank unit by hand and see if receiver unit reads zero with tank unit float in bottom position and full with tank unit float in to
7. centrifugal with a maximum r p m hand and electrical The centrifugal tachometer works on the weight type governor principle and is driven from the distributor shaft in the same manner as the magnetic type The centrifugal type also has a maximum r p m hand on the tachometer head to record maximum speed of engine The electric tachometer is a two unit combination consisting of transmitter and tachometer head The head is mounted on the instrument panel and the transmitter on engine side of dash The transmitter name plate pro vides a cover for an easily replaceable standard flash light battery which supplies a fixed volt age to guarantee 2 overall accuracy The current requirement is so small that the bat tery will give anormal service of approximately six months The electric tachometer receives electrical impulses from the distributor through the transmitter and records the r p m in this manner Tachometer Flexible Shaft A complete flexible shaft consists of two major assemblies A flexible outer casing with nuts and ferrules at both ends and a wire wound flexible inner coil assembly with squared ends or crimped on tips The core diameter and end connections vary for different applica tions One end of the flexible shaft is attached to the instrument speedometer or tachometer and the other endis attached tothe transmission or power take off point The flexible inner core transmits the power from the take off while th
8. e Instructions The following units require no adjustment or maintenance other than keeping the elec trical connections tight Due to the intricate construction no attempt should be made to re pair or calibrate these units IF UNIT FAIL URE OCCURS REPLACE WITH A NEW UNIT However no unit should be removed until a thorough checkhas been made of wiring sender units condenser etc for ashort otherwise a new unit will also burn out Coil Ammeter Starter switch Ignition switch Circuit breaker Stop light switch PRINTEO IN UNITEO STATES OF AMERICA INSTRUMENTS Section A Page 1 Air pressure Ammeter Tachometer gauge Speedometer Fuel gauge Instrument Temperature insect lights auge ights i Beam E Oil indicator light pressure gauge A 22498 Fig 2 Electrical tachometer Magnetic starting switch Headlight sealed beam unit Headlight dimmer switch Fuel gauge and fuel tank sender unit Oil pressure gauge and engine sender unit Water temperature gauge and engine send er unit CAUTION Always have ignition switch in OFF position when changing or working on instruments to avoid the possibility ofa short circuit which will damage instruments Both sender and receiver units must be of same type Do not use a sender unit of one manu facturer with a receiver unit of another or vice versa Fuel Gauge Operation King Seeley When fuel tank is empty Fig 3 the two contacts infuel tank se
9. e outer casing is held rigidly in place at each end by the ferrules and nuts Repairing Tachometer Flexible Shaft Disconnect both ends of the shaft and re move from vehicle Pull the core out of the casing and check for kinks by rolling on a flat surface If a flat surface is not available take an end in each hand and roll core between fin gers In either case a core kink will show up as a hop atthe kinked point Never reuse a kinked core because it will cause fluctuation of the speedometer or tachometer point Also check for frayed spots by running it loosely through your finger Do not reuse a frayed core Kinked or frayed core usually indicates a casing with very sharp bend CAUTION Under no circumstances should a casing have less than a six inch radius bend Lubricating Tachometer Flexible Shaft Thoroughly clean the core and casing Ap ply a thin coat of graphite impregnated non hardening grease evenly over the core ONLY Hold the casing with one hand and feed the core with lubricant into casing CAUTION Never fill or pack the casing with grease Periodical lubrication of the flexible shaftis recommended to avoid premature failure Donated by John amp Susan Hansen For Personal Use Only INSTRUMENTS L LINE MOTOR TRUCK SERVICE MANUAL Section B Page 1 METHOD OF SPEEDOMETER ADAPTER CALCULATION There are occasions when due to changes in axle ratios or tire size it is necessary to make compensating correctio
10. f truck is radio equipped check condenser on sender unit If condenser is shorted it will cause receiver unit to overread When replacing condenser it is preferable to use one of 10 or 20 micro farad capacity but up to 50 can be used if necessary to cut out radio interference b If ground and con denser are satisfactory then replace sender unit and check to see if this has corrected the difficulty 3 If receiver does not operate or fails to operate correctly then check wire lead to receiver unit Do this by attaching one end Donated by John amp Susan Hansen For Personal Use Only INSTRUMENTS Section A Page 4 L LINE MOTOR TRUCK SERVICE MANUAL of a ten foot length of wire to the terminal of the receiver unit to which sender unit wire was attached Ground the other end of the ten foot lead and turn on the ignition switch If the gauge operates now and did not operate with the regular wire connec tion the wiring is at fault and must be re placed If wiring is satisfactory then replace re ceiver unit and check again with tank unit Do not attempt the repair or calibration of any receiver or sending unit in the field as this is not practical Replacement with a new unit is the only practical means of servicing these gauges Speedometer The speedometers used on L Line trucks are of the magnetic type A speedometer is used on a vehicle to in dicate speed in miles per hour as shown by the pointer on f
11. l is already under strain a much greater amount of current is required to bend the bi metal sufficiently to break contact in this position A similar greater bending of the bi metal in the dash receiver unit occurs and this action pulls the needle over to the full point The movement of the needle in any posi tion caused by the make and break of the cir cuit is so minute that it can not be detected Oil Pressure Gauge Operation King Seeley The operation of the oil pressure gauge sender unit is similar to the fuel gauge sender unit except that instead of a cam a diaphragm is used as a means of moving the grounded contact The dash receiver units operate ex actly the same NOTE Should the oil pressure gauge indicate pressure lower than normal the engine sender unit and dash unit should be checked prior to looking further for the trouble Fig 5 In some instance low oil pressure reading on the gauge can be corrected by changing the position of the engine unit This unit is normally assembled with the small depression in the cover at the top Operation with low oil pressure Heater wire Bimetal Heater wire p insulated contact Grounded contact Flexible diaphragm Oil pressure S Dash receiver me ily Ignition switch Pressure A 23178 Fig 5 Oil Pressure Gauge No Pressure Operation with high oil pressure Heater Bimetal Heater wire f Insulated contac
12. nder unit are just touch ing With the ignition switch on current flows through the circuit warming up the heater wires which causes the bi metals to bend and Operation with tank empty Insulated contact eee pee ES eeesese S Dash receiver Wry Diaphragm Tank sender Ignitian switch A 22943 Fig 3 Gas Gauge Tank Empty Donated by John amp Susan Hansen For Personal Use Only INSTRUMENTS Section A Page 2 L LINE MOTOR TRUCK SERVICE MANUAL NIMA bending of bi metal in tank sender unit opens the contacts and circuitis broken the heater wire then cools and the bi metal returns to its former position Contact is then again made and the procedure is repeated at the rate of approximately once per second Since both heater wires are in the same circuit a similar slight bending of the bi metal in the dash receiver unit occurs which is just sufficient to make the needle register zero When tank is filled with gasoline Fig 4 the action of the float andcam pushes the grounded contact against the insulated bi metal contact bending the bi metal in the tank sender unit Operation with tank full Insulated contact Grounded contact Diaphragm Tank sender Y Ignition switch i A 22945 Fig 4 Gas Gauge Tank Full Now if the ignition switch is on the action de scribed inthe preceding paragraphs occurs but because the bi meta
13. ns in the speedometer drive Parts catalogs list available speedometer adapters and the one chosen should most closely coincide with the calculated results The following formulae are based on new tire radii when correctly inflated and properly loaded and should prove helpful in selecting speedometer adapter equipment A Seti Forma Problem A Actual distance D Old tire rev Error in traveled Present Required Tire size per mile Present Required speed _ X adapter adapter has been X adapter adapter ometer Speedometer ratio ratio changed New tire rev ratio ratio indication reading per mile NOTE If no adapter in present hook up disregard in calculations EXAMPLE Old tire rev per mile 7 00 20 573 New tire rev per mile 9 00 20 525 NOTE Ifnoadapter in present hook up disregard in calculations EXAMPLE Actual distance traveled 5 miles Present adapter ratio 1 155 Speedometer reading 6 miles Formula is then Present adapter ratio 1 200 573 Required Formula is then X 1 155 1 260 adapter 5 525 ratio 6 x 1 200 9996 adapter Present adapter ratio X ratio gt k y B Tire size old tire rev per mile X Required B Old axle ratio Present Required riada E E adapter Axle New axle ratio X adapter adapter h d New tire rev per mile X ratio ratio EW
14. p position 2 Two ten foot lengths of insulated wire equipped with clip terminals at each end PRINTED IN UNITED STATES OF AMERICA To ignition switch Instrument being tested Tank unit known to be satisfactory Sending unit being tested A 22931 Fig 9 Method of checking gauges These long lengths will in practically all instances permit individual making check to sit in seat of truck and observe gauge being checked Method of Checking Gauges IMPORTANT No units should be re moved from truck until check has been com pleted which shows such units to be damaged or defective l Disconnect sender unit being checked and hook in tank unit as shown in Fig 9 Turn on ignition switch and operate float rod of tank unit by hand With float of tank unit at bottom position receiver unit being checked should register at bottom mark on dial Next move float rod up to top posi tion then receiver unit being checked should move totop mark on dial allow one minute for receiver to come to rest NOTE Exceptions tothis are the oil pres sure and water temperature gauges The oil pressure gauge should register at the RUN mark with the float rod at top posi tion This is the mark just below the top mark on this gauge The water tempera ture gauge should register at the HOT mark 2 If receiver unit operates correctly then check sender unit on truck to see if itis properly grounded Also a i
15. t gt Grounded contact Pressure plug lla Ignition switch A 22947 Fig 6 0il Pressure Gauge With Pressure Note in Fig 6 that the deflection of the diaphragm pushed the grounded contact against the insulated bi metal contact bending the bi metal in the sender unit Water Temperature Gauge Operation King Seeley The engine sender unit consists of a fixed grounded contact so positioned that the bi metal against whichit presses is bent mechan ically At low temperatures Fig 7 consider able heat is required to make this bi metal bend away from the grounded contact With the temperature of the engine cooling water Operation with low temperature Bimetal Insulated contact Bimetal temperature operated Heater wire Heater wire O Dash receiver Ignition switch Grounded tontact Water temperature heat plug A 22944 Fig 7 Water Temperature Gauge Cold AA 7 Donated by John amp Susan Hansen For Personal Use Only L LINE MOTOR TRUCK SERVICE MANUAL INSTRUMENTS Section A Page 3 Operation with high temperature Insulated contact Bimetal temperature operated Bimetal Heater wire Heater wire Niet Water temperature heat plug Ignition switch A 22946 Fig 8 Water Temperagure Gauge Hot low all this heat must be generated electri cally and this same current flowing through the heater wire of the dash re
Download Pdf Manuals
Related Search