SIMPLY MILES AHEAD - York Transport Equipment
Contents
1. Replace Autoslack if the Back CCW Torque reading is less than 12 ft lbs 16 Nm Rotate the Hex shaft a maximum of 5 clicks ratchet teeth while taking torque readings SMAXL 100398 Page 92. INSTALL brake drum AUTOSLACK 8 Back off Hex nut one half turn CCW to complete setup ADJUSTER Actuation Rod Movement ae 1 4 TURN 1 2 13mm ROD MOVEMENT The Actuation rod will move as a slight force is used to turn the u adjusting Shaft hex 1 4 of a turn will cause full movement of the Actuation Rod Full movement of the Actuation rod is about 1 2 Clockwise CW movement of the Adjusting Shaft Hex will move the Actuation Rod into the Slack Body Counter Clockwise CCW movement of the Adjusting Shaft Hex will move the Actuation Rod out of the Slack Body Replace Autoslack if Actuation rod does not move Gear Movement amp Front Torque Using a torque wrench rotate Adjusting hex nut through 6 full revolu ae var tions Front Torque will increase to a peak value then return to zero wor several times on each revolution como lA The spline should rotate about 90 degrees ke The Front CW Torque should be less than 75 in lbs 8 5 Nm va 90 GEAR ROTATION CW 6 FULL TURNS Replace Autoslack if spline does not rotate or if torque readings are greater than 75 in lbs 8 5Nm Back Torque Assemble a crewson brunner clevis to the Autoslack Body and the Actuation Rod with the clevis pins Using a torque wrench 12 FT LBSMIN turn the adjusting Shaft Hex CCW Back torque will increase to 16 Nm a peak value then return to zero as the ratchet clutch disengages gt
3. 4144 CON MET SMAXL 100398 Page 7 SY CO RIES YORK AXLES SMAXL CREWSON BRUNNER AUTOSLACK FIELD INSPECTION No Autoslack can compensate for braking System Deficiencies The brakes should be in good operating condition and be well maintained Crewson Brunner Autoslacks should not require manual adjustment except for initial installation and brake relines The Autoslack unit must be installed with a Crewson brunner clevis and template By constantly manually readjusting the Autoslack Adjuster the internal clutch life can be shortened AUTOSLACK ON THE VEHICLE Free Stroke Free stroke is the distance the slack arm moves in order to make the brake shoes contact the drum Move the slack arm with a small pry bar and measure the movement distance This distance should be 10mm to 16mm If free stroke is greater than 16mm check the foundation brake components Repair and replace as needed Push Rod Power Stroke Measure the power stroke the difference between when the brake is off and when air is fully applied at 80 to 90 psi application pressure This distance Stoke must be less than or equal to the maximum in the chart below Tf the stroke is correct Chamber Types Adjusted stroke the Autoslack i ti i 16 20 24 less than or equal to 44mm i Kern ne ing propery 30 less than or equal to 51mm Re 36 less than or equal to 57mm Back Torque With the Autoslack cor
4. EP2 grease or equivalent Rotate wheels and check wheel bearings to ascertain if there is excessive bearing movement Readjust as necessary Every 100 000 Km Remove hubcaps inspect bearings and lubrication Readjust and re torque the outer nut resecure lock tabs Visually check the axle and ancilliary components for cracking damage and wear Repair or replace as necessary Every 300 000 Km Remove wash and inspect wheel bearings replace if necessary When re assembling bearings must be properly lubricated and adjusted to York s specifications IMPORTANT NOTE If the operating service conditions are severe this procedure may be required at more frequent intervals BEARING LUBRICANTS GREASE Mobil HP or equivalent OIL Mobil 85W 140 or equivalent Page 3 TWIRIK YORK AXLES YORK TRAILER AXLES Wheel Bearing Adjustment We recommend that all axles should have the wheel bearings adjusted initially after the first 5 000 km and then at 100 000 km intervals This does not preclude the need for inspecion and adjustment as necessary every 25 000 kms if service conditions require this The recommended wheel bearing adjustment procedure is 1 Make sure that the hub revolves freely and if necessary temporarily slacken off the brake adjustment to ensure complete freedom from brake binding drag 2 Rotate the hub in both directions at the same time tightening the bearing adjusting nut Continue until a binding i
5. YI RIK SIMPLY MILES AHEAD YORK TRANSPORT EQUIPMENT PTY LTD 13 Monterey Road Dandenong Vic 3175 YORK TRAILER AXLE SERVICE MANUAL YORK TRANSPORT EQUIPMENT PTY LTD MELBOURNE SYDNEY Ph 03 9706 5967 Ph 02 9725 5411 Fax 03 9706 8501 Fax 02 9725 5419 SMAXL 100398 Page 1 SMAXL VC OBI SRI BULLETIN SIMPLY MILES SERVICE INFORMATION amp WARRANTY CONDITIONS York Trailer Axles York trailer axles are guaranteed for one year against faulty parts and workmanship However attention to the following is crucial to that warranty i ii iii iv v vi No York axle should be loaded to more than the design load of 10 tonnes or the design load agreed to by York in writing for any particular application York axles must not be operated with the brake torque chamber size and lever length in excess of the Australian Design Rule compliance for that trailer All welding to York axle beams should be carried out strictly in accordance with York s technical specifications At point of manufacture York have adjusted the wheel bearings in accordance with York s technical specification This must be checked at the first 5000 Km service and readjusted if necessary to be within this range York have marked the outer nut at the spindle keyway to provide a reference to the initial factory setting When the bearings have been readjusted the mark might not be at t
6. a bearing cup or spacer needs to be replaced replace all bearings and cups See Bearing Cup Replacement under Hubs with Manually Adjusted Bearings Also replace the spacer if it shows signs of damage See the Part Number Identification chart for part numbers 3 If in case of emergency field repair the PreSet hub bearings as listed in the identification chart are not available your PreSet hub can be easily converted see Conversion Procedure below into a conventionally manually adjusted hub and bearing set by removing the spacer Be sure to follow the manual bearing adjustment procedure see Specifications if you convert your PreSet hub to the manually adjusted system 4 For additional service information see the required topic under Hubs with Manually Adjusted Bearings CONVERSION PROCEDURE If any parts identified as manual adjust parts are used to service a PreSet hub follow the procedure below 1 Remove the tubular spacer from the assembly It is not used when the bearings are manually adjusted Save the tubular spacer so the hub can be converted back into a PreSet hub 2 Assemble the hub onto the spindle as a conventional hub and bearing assembly as described in the section Hubs with Manually Adjusted Bearings 3 Use a spindle lock nut system as used on manually adjusted hubs to establish the bearing adjustment 4 To return the hub to Preset configuration replace all manual adjust cups cones and seal with the PreSet
7. cool or quench it in water The weld will cause the cup to shrink enough to allow it to be easily removed 5 To replace the bearing cup heat the hub evenly as in step 3 above 6 Remove the hub from the oven or water quickly and press in the new bearing cup Be sure the cup is properly aligned and fully seated Take care to avoid damage to the bearing bore and shoulder Be sure both cups are fully seated before installing the hub If the cup is being pressed into an unheated hub additional installation force will be required To reduce the installation force the cup can be put in a freezer for an hour prior to installation 100398 Page 6 TWIRIK YORK AXLES Seal Replacement 1 The seal should be replaced every time the hub is removed from the spindle 2 Follow the seal manufacturers instructions for removing and installing a new seal Use the tools recommended by the seal manufacturer Con Met PreSet Hubs INSTALLATION 1 All PreSet hubs are shipped ready for installation with a thin film of lubricant on the bearings Additional lubricant will have to be added after installation Use only clean parts for service 2 Install the PreSet hub all the way onto the spindle Allow the temporary plastic alignment sleeve if present to be pushed out ofthe PreSet hub as it is installed onto the spindle If an alignment sleeve was present it can be discarded Once the hub is on the spindle Never remove the outer bearing Removin
8. g the outer bearing may cause the seal to become misaligned resulting in premature seal failure 3 Remove the temporary plastic bearing cover and install the spindle nut Torque the spindle nut to 400 Nm 300 Ibft Do not back off the spindle nut It may be necessary to tighten the spindle nut a little more to allow the alignment of the lock washer with the spindle nut Install the lock tab washer and outer lock nut toque the lock nut to 280 Nm 200 Ibft 4 Install the hub cap on the hub The hub cap bolt holes must be free of debris such as silicon gasket sealer to ensure that the bolts will tighten properly to avoid leaks Always use new gaskets Use the recommended lubricants to fill the hub with oil lubricated hubs it may be necessary to add oil to the hub three or four times to assure the correct oil volume Con Met PreSet Hub Installation Torque Applied to all Spindle Nuts 300 Ib ft 400 Nm LOCK IN PLACE NO BACK OFF If the locking device is not aligned and locked at 300 Ib ft 400 Nm advance the nut to the next position that allows the nut to lock Check the nut and verify that the locking system is engaged before installing the hub cap PART NUMBER IDENTIFICATION Description York Part No Timken Part No Outer Bearing Cone 79 787955 01 NP899357 Outer Bearing Cup 79 787955 02 NP026773 Inner Bearing Cone 79 787956 01 NP965350 Inner Bearing Cup 79 787956 02 NP503727 PreSet Bearing Spacer 79 10
9. he keyway this will be because of the bearings settling in during the initial service period The locknut must be re torqued to 340 to 400Nm each time the bearings are rechecked Operation of York axles in correctly specified applications with regular inspection adjustment and lubrication is vital to ensure maximum life of all components and to comply with York s warranty conditions The enclosed Service Information Data sheet sets out the minimum servicing requirements YORK TRANSPORT EQUIPMENT PTY LTD BRENDAN DULLARD Director amp General Manager 100398 Page 2 TWIRIK YORK AXLES SMAXL 100398 YORK TRAILER AXLES First 500 Kilometres Check tightness of all wheel nuts On delivery After wheel changes NOTE Recommended torque settings dry threads the use of power tools for torque settings is not recommended 1 WHEEL NUTS Note 1ft Ib 1 36Nm ISO M22 studs 550 600 Nm ISO M24 studs 650 750 Nm BSF 7 8 BSF studs 475 540 Nm DIN 22mm studs 515 540 Nm Japanese M20 studs 400 440 Nm Japanese M24 studs 650 750 Nm Spider Hubs 3 4 UNC 200 260 Nm 2 CAMSHAFT BRACKET SETSCREWS M12 90 100 Nm M10 30 35 Nm Lubricate camshaft grease nipples using EP2 grease Ist Service 5 000 Km Full bearing adjustment Ist amp every 5 000 Km Check and adjust brakes and check brake linings for wear Every 25 000 Km Lubricate slack adjuster and camshafts using
10. parts listed in the Part Number Identification chart Next install the hub with the spacer following the instructions for Installation on page 7 Hubs with Manually Adjusted Bearings HUB MAINTENANCE 1 Clean and inspect the wheel bearings and seal bore each time the hub is removed or when contamination is evident Replace damaged bearings and cups as a unit see Bearing Cup Replacement 2 See axle manufacturers publications for lubrication requirements and bearing service intervals 100398 Page 5 TWRIK YORK AXLES SMAXL Wheel Stud Removal DETERMINATION OF DAMAGED WHEEL STUDS 1 Replace wheel studs that have damaged or distorted threads are broken or bent or are badly corroded Also replace the stud either side of the stud being replaced due to damage If two or more studs have damage replace all the studs in the hub 2 Always use appropriate safety equipment and take appropriate safety precautions for the job Safety glasses gloves ear protection etc will be necessary depending on the equipment and process WHEEL STUD REMOVAL 1 Place the clean hub on a press with the hub supported evenly around and adjacent to the stud being removed 2 Be sure the hub supported so that it will not tip when force is applied to the stud Then press the stud out of the hub The configuration of some hubs is such that it is impractical to have supports that will prevent the hub from tipping when force is applied to the
11. rectly installed on the axle Back Torque CCW Rotation can be measured Using a torque wrench turn the Adjusting Hex CCW Back Torque will increase to a peak value then return to zero as the ratchet clutch disengages I Replace Autoslack if the Back CCW Torque reading is less than 12 ft lbs 16 Nm seem NL 16 Nm Rotate the Hex shaft a maximum of 5 clicks ratchet teeth while taking torque readings 100398 Page 8 SY CO BRIE YORK AXLES AUTOSLACK REMOVED FROM VEHICLE Crewson Brunner Autoslacks are fully lubricated Crewson Brunner Autoslacks can not at the factory A grease fitting is provided for be diassembled in the field Never normal maintenance tamper with the units factory settings Verify Autoslacks Set Up 3 POSITION 4 ANGLE A CLEVIS Select the correct template for the spline size and armhole location oy Fit Installation Template over S Cam and put 1 2 pin into clevis Swing Template to engage 1 2 pin Screw clevis CW or CCW on push rod until 1 4 holes in clevis and template line up Be Template now indicates correct set up angle A 6 Remove template and 1 2 pin Install Autoslack adjuster on S Cam ER D eS Nn EN dni 2 ENGAGE l OR A and turn the Hex nut CW until 1 2 and 1 4 holes line up with the So DISEN GAGE clevis u 7 Install and secure clevis pins Turn nut CW until shoes contact the _ FITS OVER S CAM 5
12. s felt and a torque setting of 150 170 Nm is reached 3 Using the lockwasher as a guide slacken the adjusting nut back 6 holes and refit the lockwasher Fit the lock tab washer Taking care that the adjustment is not disturbed fit and tighten the axle locknut to 340 400 Nm Check that the hub and drum rotates freely Bend the tabs on the lock tab washer over to prevent the locknut coming loose in service 6 HOLES b USE LOCK WASHER LOCK WASHER AS A GUIDE SLACKEN BACK BY 6 HOLES IMPORTANT CHECK END FLOAT IS 0 08mm TO 0 20mm IF NOT READJUST SMAXL 100398 Page 4 TWIRIK YORK AXLES SMAXL CON ues Note PreSet hubs are designed for extended service without any maintenance If circumstances overhaul accident abuse etc indicate service is required PreSet hubs should be serviced with the close tolerance bearings indicated on the Part Number Identification chart In the event that these bearings are not available standard bearings can be used by following the conversion procedure below Con Met PreSet Hubs IDENTIFICATION See Part Number Identification table on page 7 HUB MAINTENANCE ji Thoroughly clean and inspect any hub that has been removed for service Discard used seals and gaskets Use new seals and gaskets on reinstallation and replace worn or damaged parts 2 Clean and inspect the wheel bearings spacer and hub each time the hub is removed or when contamination is evident If
13. stud If that is the case support the hub on wood blocks on the floor and use a hammer to drive the studs out with several sharp blows Be careful to avoid damage to the hub particularly to the seal bore and ABS ring Wheel Stud Replacement 1 Check stud length to verify that the stud stand out will be correct 2 To In stall a new stud support the hub evenly around and adjacent to the stud being installed Caution Some studs have a flat edge on the head Be sure that the edge is line with the groove or shoulder on the head 3 Press the new stud all the way into the hub Be sure the stud is fully seated and that the stud head is not embedded into the hub WARNING If the stud head is embedded into the hub the hub should be replaced Bearing Cup Replacement 1 Separate the hub from the spindle and wheels 2 Thoroughly clean and degrease the hub with a nonflammable solvent 3 It is recommended that the hub be heated evenly throughout in an oven or in boiling water to 175 215 F See below for an alternative method 4 Remove the hub from the oven or water and quickly press out the bearing cup Take care to avoid damage to the bearing cup bore and shoulder Variations within tolerances of materials and oven temperatures may allow the bearing cup to drop in and out easily Alternate Procedure Use an electric welder to weld a large bead around the bearing surface of the steel cup Do not spatter weld on to the hub Let the assembly
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