Packard Service Counselor, Studebaker-Packard
Contents
1. Direct drive clutch pressure 7 Governor pressure 8 Throttle pressure GEAR START ULTRAMATIC TRANSMISSION PRESSURE TEST FORMS A Report on Gear Start Ultramatie Unit Owner Envine Vehicle No Del Date___ oe so ey e mwen EAN F Fag Mileage The results Of the Pressure Test ore as follows Front Pump 1 400 RPM AII Selector Positions Readings 80 95 0 95 AD AS Si 80 95 D Pysition t to 20 MPH Full throttle before Direct Drive engages Max Pressure R adinit 150 180 D Positlen Full throttle before Direct Drive engiges Max Pressire Reathiny _ 140 150 High Range Clutch 2 Pressure should be the same ar nuit more than 10 lbs under pump pressure PP HRCP 400 RPM Reading en BOTTOM View Bi HS 7 1 1D Position D Pasition 15 to 20 MPIT Converter Drive Reading__ Ss 150 167 145 145 D Pusition 40 RPM Readine BUUS D Positi n 20 MPH Direct Drive Steady thrattle Reading Direct Drive 6 Pressure should be the same or not 1309 more than 10 tbs under pump pressure D Position 15 to 18 MPH P P D D P Low Brake Top S Pressure should be tle samme or Reading not mure than 10 lbs under pump pressure PP LEP Before Engagement z 8 95 te N oe sni Re j D Pisithn 400 RPM Reading o After Engacement Reading BEDS 75 90 Kickd Read i nw Rei Oe en hy D Position i00 RPM Reading da SY2. VOL 28 NO 11 The official name for the Gear Start Transmission is referred to as such in all future service publications 7 rT A A g E p IVY r mi NOVEMBER 1954 TWIN ULTRAMATIC TRANSMISSION and will be E Most all of the zones have completed the Twin Ultramatic Transmission schools with their dealers and accord ing to reports the service training panel covering the hydraulic system was highly received by the mechanics Pockerd Fives you This type of service training aid is planned for future schools wherever it can be applied We feel that a better understanding of any and all units of the car will result in a more accurate diagnosing of complaints and better workmanship which means quicker and better repair jobs for the Packard owners Pictured are schools held recently by the Los An geles Zone Twin Ultramatic Transmission HYDRAULIC TESTS Hydraulic pressure tests are a most important factor when diagnosing automatic transmission com plaints If a complaint or trouble is not definitely located or established do not disassemble the unit until the oil level is checked the car road tested and a hydraulic unit pressure test is made Too many times a unit is disassembled and when the inspection is made the cause of the complaint cannot be found because the clue or evidence of the cause has been lost or destroyed In many instances come backs could be avoided if a hydra
3. abs ETET 80 95 D D Position Immediately Governor 7 13 MPH Reading _ After Upshift Reading 15 20 SE 40 09 28 MPH Reading_ z M netra r j t Daxi Ye Converter In 4 400 RPM D Position 56 MPH Reading Rceading 55 65 60 70 Throttle 4 400 RPM Reading 70 80 sesh Reading ____ Ful Throttle Rending 15 25 ote Reading Kickdown Resiiny RBs 15 MPH Before Direct Drive Reading Direct Drive Engaged Nate Red figures indicate correct pressures D Position Not Gear Start D Posttion Gear Start ONI All pressures taken at normal operating tempera zon ture Converter Out D Pesition 15 to 18 MPH Canverter Drive Readir Bay Direct Drive Reading File with Owner s repair order Fig 1 NOTE When making pressure tests use the pressure test forms shown in Fig 1 The figures below the lines on the form indicates correct pressures TOOLS The necessary special tools required to make a complete hydraulic pressure test on the Twin Ultramatic Transmission are PK 23 Special Test Pan Adapter Throttle Pressure Adjusting Wrenches and Gauge Hose Ex tensions PU 300 Three Gang Pressure Test Gauge s PREPARATION As most of the pressure tests are taken with the Car in motion at various speeds the gauge should be in the driver s compartment where it can be seen while driving Remove the flexible tubing from the left fresh air duct thread th
4. e gauge hoses through the left fresh air grille out of the air duct and down to the trans mission See Fig 2 for location of the pressure test take off points UPPER FITTING Three pressures can be taken at one time therefore study the nature of the trouble to determine the combination of pressures that may be at fault Suggested list of pressure test combinations without removing the transmission oil pan 1 Front Pump High Range Clutch Converter In 2 Front Pump Direct Drive Clutch Converter In 3 Front Pump Converter In Convyerter Out 4 Direct Drive Clutch Converter In Converter Out 5 Direct Drive Clutch Governor Converter In CONVERTER OUT PRESSURE To take the converter out pressure a special tee connection will be required Install and braze a 1 male nipple into one end of a 1g tee ba Remove the upper oil cooler tube adapter from the side of the bell housing and install the special tee connection in the bell housing Install the oil cooler tube adapter in the tee and reconnect the cooler tube See Fig 3 Connect a gauge hose to the tee connection THROTTLE PRESSURE AND LOW BRAKE TOP PRESSURE The throttle pressure and low brake top pressure test take off points are located on the control assembly See Fig 4 To make these tests follow the pro cedure outlined Fig 4 a Drain the oil remove the transmission oil pan and screen b In
5. ohm resistor in place of the battery as was previously recommended on earlier models the indicated voltage setting will t ad to be erratic and always will be considerably lower than that obtained with a battery in the circuit The use of a fixed 4 ohm resistor connected in series with the battery is entirely satisfactory for checking the voltage regulator setting on both old and new type regulators in either 6 or 12 volt models Headlight Aiming The AMA specifications on headlamp aiming has been changed in respect to the height of the light beam Please make this change on page 22 Electrical Section of your Service Manual In the 2nd para graph under Headlight Aiming change 3 dimension to 2 PRINTED IN U S A
6. stall the test pan adapter and gasket with the adapter elbow tube on the left side and toward the front of the car Thread two of the gauge hoses through the elbow tube on the adapter c Remove the 1 pipe plug A from the bottom of the low brake and install a 14 elbow in this opening Connect one of the gauge hoses to the elbow Remove the 1 pipe plug B from the throttle valve body and install a 1 elbow in this opening Connect the other gauge hose to this elbow d Install the two oil suction tube extensions as shown in Fig 4 and install the oil pan and gasket Reinstall the oil that was drained out or the same amount of new oil NOTE The throttle pressure is a very important pressure as it controls most other pressures in the system controls upshift clutch engagements and dis engagements Therefore it is important that throttle pressure be accurate THROTTLE PRESSURE ADJUSTMENT Before attempting to adjust the throttle pressure check all of the throttle linkage adjustments as de scribed in the Maintenance Section of your Gear Start Ultramatic Transmission Training Booklet 64 The throttle pressure should be 23 Ibs at 400 RPM with the oil at operating temperature The throttle pressure adjusting screw is shown in Fig 5 It can be adjusted by removing the rubber plug in the adapter and using the two small wrenches through the opening as shown in Fig 6 Be sure to recheck the press
7. ulic pressure test was made after the work was completed For example a certain part was replaced but the cause of the failure was not deter mined Make a pressure test it may give you the cause which should be corrected thus avoiding a repetition of the trouble FLUID LEVEL The fluid level should always be checked and brought up to the full mark before any diagnosis is made Low fluid level can be the cause of many com plaints ranging from excessive noise to a noticeable slip in any or all of the operating ranges ROAD TEST After the oil level is brought up to the full mark road test the car to determine if correcting the oil level has corrected the complaint The road test will also warm up the engine and transmission to operating temperature necessary to make an accurate pressure test Drive the car with frequent stops and starts at low speed accelerating andat medium speeds similar to the conditions that would exist in driving in heavy 62 traffic and highway driving After the engine and transmission are thoroughly warmed up and the non standard operation noted make a hydraulic pressure test as outlined below HYDRAULIC PRESSURE TEST To diagnose and isolate the cause of the faulty operation a pressure test should be made of the following hydraulic units 1 Front pump pressure 2 High range clutch pressure 3 Low brake top pressure 4 Converter in pressure 5 Converter out pressure 6
8. ure after the adjusting screw lock nut is tightened Suggested list of pressure test combinations with gauges connected to the control body 1 Throttle Low Brake Top High Range Clutch 2 Throttle Low Brake Top Direct Drive 3 Throttle Low Brake Top Governor 4 Throttle Low Brake Top Front Pump 5 Throttle Low Brake Top Converter In After the pressure tests have been completed and the readings posted on the pressure test form com pare your pressures with those on the test form Careful study of the pressures in conjunction with the hydraulic charts will greatly aid you in diagnosing troubles Voltage Regulator Testing Procedure DELCO MODEL 1118829 5402 06 11 13 26 31 Field reports indicate that the importance of check ing the voltage setting of Model 1118829 type regu lators with a battery in the circuit is not fully appreciated by all concerned The Model 1118829 type regulators do not include a accelerator or kicker coil on the voltage regulator unit As a result the rate of armature vibration is slower than that of earlier types and the voltage setting can be checked accurately only when a battery is connected in the charging circuit For this reason it is specified that voltage regulator checks on these regulators be made with a fixed 4 ohm resistor of not less than 25 watts capacity connected in series with the battery If Model 1118829 type regulators are checked by using a 4
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