1951 Hudson Hydra-Matic Drive
Contents
1. accelerate engine to wide open throttle Tune up rS Do not hold throttle open Hydra Matic Diagnosis Guide 27 Finally Use of the Diagnosis Guide by ServiceSalesmen Testers and others who must relay to the Mechanic what corrective work 15 necessary will result in the ordering of specific operations rather than repair order reading Overhaul Transmission Also the guide when properly handled provides complete factual information on the Hydra Matic Transmission for car history records DRIVING INSTRUCTIONS Drive the automobile with the owner when he takes delivery of his new Hydra Matic equipped HUDSON The following items must be fully explained 1 STARTING 2 DRIVING STARTING 1 Apply hand brake 2 Place selector lever in N neutral position 3 Depress accelerator pedal halfway and release Never pump accelerator or race the engine 4 Turn ignition switch on and press starter button DRIVING SELECTOR LEVER TI ONS N Neutral Dr Normal Forward Driving Lo Max Power Forward or Braking on Steep Grades R Reverse NORMAL FORWARD DRIVING Move selector lever to Dr Depress accelerator to attain desired speed TRAVELI NG UP OR DESCENDING GRADES Move selector lever to Lo Lever can be moved from Dr to Lo at any speed below 48 MPH Shifting into Lo above 48 MPH will not be effective until the car speed is reduced below 48 MPH The change from Dr2. WITH Hydra Matie Drive NEW CAR INSPECTIONS AND ADJUSTMENTS AND INFORMATION BULLETIN TO ALL DEALERS Some reports have been received from the Field indicating that the band adjusting screw threads in the cases of Hydra Matic transmissions were stripped when making band adjustments necessitating expensive repairs and replacement of the case Investigation shows that this difficulty is caused by the band adjusting screws being completely backed out of the case when performing band adjustments To preclude the possibility of this occuring we are changing the instructions covering band adjustment on pages 20 and 21 of the Hydra Matic Drive New Car Inspection and Adjustment Book on page 39 section 11 of the Hydra Matic Service Manual and on page 39 section 11 of the 1951 Mechanical Procedure Manual These instructions which call for backing out the band adjusting screws until the engine speed increases from the 700 R P M idle setting to 900 1000 R P M are being changed to show speed increase to 800 900 R P M This reduction in engine speed increase makes it unnecessary to turn the adjusting screws all the way out however if this should be done the selector lever should be placed in the N position before installing the screws To eliminate the danger of cross threading the screws should be started and given at least three full turns by hand before using band adjusting tool J 2681 A Es Us BEUM TECHNICAL SE
3. to Lo can be made at any speed below 48 MPH when road is dry and traction IS good This Shift is not recommended on slippery pavement since skid ding may result REVERSE Come to full stop before shifting Apply service brakes move selector lever to Lo hesitate then lift lever slightly and move to FORCED DOWNSHIFT FROM FOURTH TO THIRD For increased power when climbing hills or passing at speeds below 60 MPH depress accelerator to the floor A shift back to fourth speed will occur automatically when accelerator 15 released or when car has reached mately 65 MPH NOTES NOTES
4. Figure I Figure 2 When the gauge pin enters both holes freely remove the gauge pin and tighten the trunnion lock nuts B securely Recheck this adjustment by again entering pin into the bell crank lever and boss hole Pin should again enter both holes freely After rechecking remove gauge pin 3 Raise car disconnect the transmission throttle rod G Figure 3 at the transmission outer lever H Tighten outer throttle lever clamp bolt F if necessary EXE 2 mS Figure 5 4 Check position of the outer throttle lever as follows a Clean the machined surface at back of transmission case and place the throttle lever checking Fixture J 2195 flat against the back surface of the transmission case with the edge of the checking gauge against the transmission side cover Figure 3 b With the transmission outer throttle lever held against its stop toward rear of transmission the throttle outer lever hole should enter freely over the small diameter of the gauge pin 1 and the inside face of the throttle control lever should just touch the larger diameter of the gauge rod Do Not Force the outer lever against its stop and Do Not try to bend this lever unless you have the proper bending tool NOTE If the outer throttle lever lower hole will not enter over the checking fixture pin as outlined in paragraph b use the Throt tle Lever Bending Tool J 3310 and bend the throttle lever to secure proper alignment employing the
5. RVICE MANAGER THIS BULLETIN AS WRITTEN IS BEING MAILED TO SERVICE STATION AGREEMENT HOLDERS AS BULLETIN NO 26 GENERAL TECHNICAL POLICIES Number Date 1 8 51 Subject IRANSMIS SION CASE IHREADS SIRIPPE ADJUT MENT INSIRUC IIONS CHANGED INSURE PROPER SCREW INSTALLA PLON FORM 11053 HUDSON SALES CORPORATION 6506 NORTH BROADWAY SI IOUIS 15 MO April 21 1952 STL 52 89 TO ALL HUDSON DEALERS SIS LOUIS ZONE Gent lemen We have had number of calls in the past two weeks where the Service Manager has spent money calling us for information with reference to the Hydra Matic Transmission refusing to shift into third speed from high gear on the kick down or passing gear This is caused by the Spring Retainer shown on Page 11 84 Figure 178 in the Procedure Manual not being in position or the L to 3 valve shown in Figure 179 being stuck in the seat or turned crossways in the front Servo To make correction in twenty minutes first drain oil from bottom pan only remove an from case and you will see the front Servo in full view Remove the pipe plug as in Figure 178 and remove 4 to 3 valve as in Figure 179 and assemble as in Figure 181 Replace the bottom pan and add the oil and in each case so far we have corrected the 4 to 3 down shift with this operation Be very careful to check for cleanliness when lower pan is removed so that no dust gets into the control valve or Servos t
6. T 1 Disconnect the transmission shift rod 0 at the manual control lower lever P Figure 7 Figure 7 2 With the transmission shift rod 0 disconnected place transmission shift lever at transmission in the reverse position by pushing the transmission shift rod 0 rearward as far as it will go reverse position Figure 7 Next pull shift lever rod 0 forward one detent placing transmission shift lever 0 in LO position CAUTION Move the transmission shift rod 0 slowly so that shift lever Q is moved only one detent to LO position 3 Place the manual control lever at steering wheel in the LO position and pull the manual control lever as far as it will go toward reverse with out lifting the manual lever 4 Adjust the length of the transmission shift 0 until the clevis pin holes in clevis align with the hole in the manual control tube lower lever P Figure 8 Do Not move either the transmission shift lever 0 or the manual control lever P when making the rod adjustment After determining that the pin enters freely increase the length of shift rod 0 by turning the clevis one full turn Install clevis pin flat washer and cotter pin Tighten clevis lock nut Figure 5 NEUTRAL SAFETY SWITCH ADJUSTMENT Place the manual control lever in the N Neutral position Loosen the safety switch adjusting screw S Figure 9 and rotate the transmission safety switch and bracket
7. T until there is 1 16 clearance between the stop U and switch lever V With the manual control lever in the Neutral position the starter should operate when the ignition switch is on and starter button on instru ment panel 1 pressed With manual control lever 1 the DR position the starter should not operate when the starter button is pressed and ignition switch is on ADJUSTING HYDRA MATIC TRANSMISSION BANDS EXTERNAL ADJUSTMENT 1 Set hand brake firmly and block front wheels with wheel chocks to prevent car running forward during adjustment 2 Remove accelerator pedal floor mat and ad justing hole cover 3 Connect an Electrical Tachometer to distributor and ground Set dwell meter to either 6 or 8 reading 4 Start engine and allow engine to run until normal operating temperature is reached Choke and fast idle off 5 Position control lever in DR range Figure 10 20 6 Adjust carburetor idle speed screw to give 700 RPM FRONT BAND 7 Using Band Adjusting Tool No J 2681 loosen the front band adjusting screw lock nut Fig 10 8 Loosen the front band adjusting screw by turning top handle while holding lower handle of Tool J 2681 until the engine speed increases to 900 1000 RPM front drum is now spinning freely 9 Tighten the front band adjusting screw slowly until engine returns to 700 RPM front drum has now stopped turning 10 Once more loosen the front
8. band adjusting screw until engine speed increases and tighten the screw again slowly until engine speed returns to 700 RPM NOTE The object in loosening and re tightening the screw is to locate the exact point at which the band stops the drum from spinning At this point wait 30 sec onds If engine speed again increases tighten screw 1 10 of turn more Repeat this procedure until engine speed remains at 700 RPM for at least 30 seconds 11 Set counter on tool to 00 12 While holding lock nut stationary with long handle of tool tighten adjusting screw exactly 51 2 turns with short handle counter will read 5 5 13 Hold the front band adjusting screw station ary with the short handle of Tool J 2681 and tighten the adjusting screw lock nut by turning the outer body of the tool with the long outer handle NOTE Adjusting screw must not move during this tightening operation REAR BAND 14 With control lever in DR range loosen the rear band adjusting screw lock nut Figure 10 15 Loosen the rear band adjusting screw until the engine speed increases to 900 1000 RPM rear drum now spinning freely 16 Tighten the rear band adjusting screw slowly until engine returns to 700 RPM rear drum now stopped 17 Loosen the rear hand adjusting screw until engine speed increases and tighten again slowly until engine speed returns to 700 RPM 21 NOTE At this point wait 30 seconds If en gine speed increases
9. bending tool as illus trated in Figure 4 to bend the lever rearward To bend the lever forward reverse the bending tool bending tool pins will now face towards transmission Figure 4 c After making the proper alignment of the throttle outer lever to the throttle checking fixture install the transmission throttle rod G clevis pin and cotter pin to the outer throttle lever H secure cotter pin Lower car Disconnect the transmission throttle rod trunnion J from the accelerator pedal link bell crank lever by removing the cotter pin and flat washer from the trunnion pin Figure 5 Gauge Pin J 2544 should enter freely into accelerator bell crank lever c and hole in boss Figure 5 Holding the transmission throttle lever H against its stop in the transmission by pushing the trans mission throttle rod rearward lightly Figure 5 adjust the transmission throttle rod so trunnion pin will slide freely into the accelerator pedal link bell crank lever M Install trunnion pin flat washer and cotter pin With the trunnion pin M in position shorten the throttle rod G by backing off the rear lock nut K 11 2 turns and tighten the upper lock nut securely Figure 6 Remove the J 2544 Gauge Pin Figure 6 Adjust the accelerator pedal rod N so that the accelerator pedal is 1 16 from its stop at the floor panel driver s compartment when the carburetor throttle is wide open MANUAL CONTROL LINKAGE ADJUSTMEN
10. e cover 2 Check the lock nuts on the front and rear band adjusting screws for tightness To do this hold the screws so that there will be no change in their position while tightening the lock nuts Torque should be 40 50 ft Ibs 3 Replace hole cover ADIUSTING M p MA ed e Fig 3 Band Adjusting Screws NEUTRAL SAFETY SWITCH 1 With hand brake applied ignition switch on and manual lever in position starting motor should operate when starter button on instrument panel is pushed in 2 Moving manual lever to Dr position starting motor should not operate NOTE If starting motor does not operate with manual lever in the position but does operate in the Dr position refer to page 149 covering adju ENGINE PERFORMANCE Engine at operating temperature 1 Timing 2 Idle Mixture 3 With manual lever position idle speed should be 490 510 RPM consistent with best idle performance MANUAL CONTROL LINKAGE 1 Check tightness of clamp bolt E Figure 4 in transmission outer shift lever to 10 13 ft Ibs torque Figure 4 THROTTLE CONTROL LINKAGE 1 Tighten the clamp bolt F Figure 4 in the throttle control lever at the transmission to 12 15 ft Ibs torque 2 With the carburetor throttle in the Full Open position the accelerator pedal must be 1 16 from its stop See Adjustments Page 145 7 CHECK FOR OIL LEAKS Figure 5 1 At crank
11. o keep them from functioning freely Yours very truly HUDSON SALES CORPORATION C G Monken Parts amp Service Manager THE 1951 HUDSON IS AVAILABLE WITH FULLY AUTOMATIC TRANSMISSION HYDRAULICALLY OPERATED HAVING 4 SPEEDS FORWARD AND ONE REVERSE NEW CAR INSPECTIONS AND ADJUSTMENTS PRE DELIVERY INSPECTION 1000 MILE INSPECTION 2000 MILE INSPECTION LINKAGE ADJUSTMENTS EXTERNAL BAND ADJUSTMENT ROAD TESTING AND DIAGNOSIS DRIVING INSTRUCTION ch CF A OQO NEW CAR PRE DELIVERY INSPECTION FLUID LEVEL BAND ADJUSTING SCREW LOCK NUTS NEUTRAL SAFETY SWITCH ENGINE PERFORMANCE MANUAL CONTROL THROTTLE CONTROL LINKAGE OIL LEAKS ROAD TEST CHECKING FLUID LEVEL OL HAS RUN BACK INTO TRANSMISSION FROM FLUID COUPLING RAISING OIL LEVEL IN TRANSMISSION SLIGHTLY ABOVE FULL MARK WITH ENGINE RUNNING COUPLING HAS FILLED COM PLETELY LEAVING THE OIL LEVEL BELOW FULL MARK WITH COUPLING FULL ENGINE RUNNING OIL SHOULD BE ADDED TO BRING OIL TO FULL MARK n LEVEL Fig 2 0il Level Engine Running CHECK WITH Engine running at normal operating temperature manual control lever in position hand brake on allow engine to run several minutes before checking Oil level must be just to the full mark on the dip stick DO NOT OVERFILL BAND ADJUSTING SCREW LOCK NUTS FOR TIGHTNESS 1 Remove floor hol
12. s Pointer should be directly over range letter when detent is engaged an adjustment is necessary refer to Adjustment of Manual Control Lever Pages 147 and 148 4 Set engine idle speed to 490 510 RPM consistent with best idle performance 5 Check throttle adjustment Pages 142 thru 146 6 Check for fluid leaks Page 138 7 Road test using the Hydra Matic Diagnosis Guide pages 152 thru 157 2000 MILE INSPECTION Perform operations 1 through 7 under the 1000 Mile Inspection plus a band adjustment The band adjustment at the 2000 mile inspection can be made internally after removing the transmission oil pan or externally after removing the inspection cover atthe transmission floor cover NOTE Do not attempt an external adjustment at any time unless special tools for the purpose and instructions for their use are available For External Band Adjustment refer to page 150 LINKAGE ADJUSTMENTS THROTTLE CONTROL LINKAGE ADJUSTMENT 1 Adjust engine idle speed at 490 510 RPM with engine at normal operating temperature transmission warm and manual control lever in neutral 2 With the carburetor throttle idle screw A Figure 1 against its stop and carburetor off fast idle adjust the accelerator cross shaft operating rod trunnion nuts B Figures 1 and 2 until gauge pin J 2544 enters freely into the accelerator pedal bell crank lever and the hole in the boss of the cylinder block at Figure 2
13. shaft rear main bearing oil 7 Front cover gasket or pump cover seal attaching screws 2 Between crankshaft and flywheel 8 Oil pan to case gasket 3 Torus cover and flywheel Side cover cap screws 4 At torus cover oil drain plug Side cover and manual shaft seal 5 At dampener rivets Rear bearing retainer seal 6 Front cover oil seal 9 Transmission oil pan drain pipe ROAD TEST The car should be given a road test to thoroughly check all phases of the Hydra Matic operation During the road test the shift pattern should be checked to see that shifts occur at the proper speeds See Diagnosis Chart page 156 DO NOT run car at speeds above 50 MPH during this test The road test will disclose any malfunction of the Hydra Matic Transmission and necessity for adjustments Refer to Page 149 For Neutral Safety Switch Adjustment Refer to Page 147 Manual Control Linkage Adjustment Refer to Page 142 Throttle Control Linkage Adjustment Refer to Page 150 External Band Adjustment Refer to Page 153 Diagnosis Guide 1000 MILE INSPECTION 1 With engine at normal operating temperature check Hydra Matic transmission fluid level with engine running and manual selector lever position hand brake on allow engine to run several minutes before checking Oil level must be just to the full mark on the dip stick DO NOT OVERFILL 2 Check neutral safety switch operation 3 Check manual selector lever position
14. ter and mechanic THIS CAN BE ACCOMPLI SHED BY THE USE The Hudson HYDRA MATIC DIAGNOSIS GUIDE which provides a means of making thoroughly uniform accu rate and systematic trouble diagnosis This guide is designed for use while the car is being road tested A simple check mark inthe proper space on the guide will indicate any malfunctions which are discovered The guide lists possible causes of troubles indi cating the units which may be responsible for the conditions checked HYDRA MATIC DIAGNOSIS GUIDE HUDSON cars 1 Shifting 2 Nolita 3 CHI Leake an Possible msn IE u epee TY ene No oe FG S penses moins uly kometen in Counting A Ayshaal or x d Flyvwhael is Cover Sealing Area Dram plug or supling Sohpet River EE ERE Pan Reor of Transmission 26 HYDRA MATIC SHIFT POINTS IM FOR HUDSON CARS UPSHIFTS RANGE MINIMUM ILL MINIMUM FULL THROTTLE THROTTLE THROTTLE CLOSED FULL THROTTLE THROTTLE STALL TEST 1450 TO 1650 UNDER 1450 OVER 1450 TEST CONDITIONS ENG R M ENG M ENG P M With the engine at operating tempera ture set control lever in D position Poor engine perform Transmission slippage or exces Fully apply haud ond Toni brake ad once such os need of torus coupling slippage
15. tighten adjusting screw 1 10 of turn Wait another 30 seconds and if engine speed again increases tighten screw 1 10 of a turn more Repeat this proce dure until engine speed remains at 700 RPM for at least 30 seconds 18 Set counter on tool to 00 19 Position manual control lever in the posi tion 20 While holding the lock nut stationary with the long handle of Adjusting Tool tighten band adjust ing screw exactly 2 turns using top short handle counter will read 20 21 Position control lever in DR range 22 Hold adjusting screw stationary with the top handle and tighten the lock nut with the long handle 23 Reset engine idle at 490 510 RPM Control lever in N position 24 Turn off 1gnition 25 Install floor hole cover floor mat and acceler ator pedal ROAD TESTING AND DIAGNOSIS After making pre delivery checks and adjustments road test over an established test route which will thoroughly test all phases of Hydra Matic operation This will uncover any hidden symptoms and determine causes of trouble that must be corrected Also the shift pattern must be checked during the road test to determine if shifts occur at the proper vehicle speeds e mM TS SALES AND BEE r N E ur IN gt QUIET Suggested Test Route SO AA gt em UNIFORM TESTING WILL l Assure COMPLETE and ACCURATE information on the repair order 2 Save TI ME for both tes
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