SD Compressor Service Guide
Contents
1. 10 1 4 Why Suction Side Flushing Is Important 23 e When the off cycle pressure equalizes in the backwards direction through damaged compressor valves debris may be forced back up the suction hose If it is not removed this debris will travel into the replacement compressor and be circulated through out the AC system causing subsequent failures 10 1 5 Flushing Rear Evaporator Lines e Debris is distributed throughout the entire AC system so it is important to flush the rear lines The rear expansion valve can be gutted or drilled out and remounted so that the rear evaporator and hoses can be back flushed as an assembly After blowing out the flushing fluid and fumes a new thermal expansion valve should be mounted 10 1 6 Importance Of Flushing Direction e Back flush or flushing in the reverse direction to normal flow is the most effective The plate fin evaporators used on many front and rear evaporators have many small passages which are difficult to clean without a strong pulsating reverse flow 10 1 7 How long do flush e Closed loop procedure flush until the flushing fluid leaving the AC components are clean Manual pressurized gun method requires a minimum of three times but more if exiting fluid is not clean 10 1 8 Removal of Residual Flushing Fluid before Evacuation and Charge e he primary vacuum pump should be protected from flushing fluid and fumes Purging of flushing solvent is necessary before connecting the2. Delivering Excellence SD Compressor Service Guide Table of Contents _ l Compressor Models Covered 2 Compressor Nomenclature 3 Cautionary Information 3 Pressure Release 3 2 Recovery of Refrigerant 3 3 Handling of Refrigerant 3 4 Ventilation 3 5 Avoid use of 3 6 Warranty for Recycled Refrigerant 4 R134a Information 4 1 R134a PAG Oil Handling 4 2 Table of Saturation Temperatures and Pressure 5 Compressor Identification 5 Label 5 2 Date Codes 6 Application Specifications 6 1 Belt Tension 6 2 Speed Rating 6 3 Basic Specifications 6 4 Assembly Torques 6 5 Mounting 6 5 1 Compressor Rotation 6 5 2 Ear Deflection Bending 6 6 Recommended Pressure and Temperature Conditions 6 6 1 Discharge Gas Condition 6 6 2 Suction Gas Condition 6 6 3 Ambient Temperature 6 7 Clutch 6 8 Oil Charge 6 8 1 Oil Flow Theory 6 8 2 Oil Charging 6 8 2 1 Passenger Car Light Duty Truck Single Evaporator 6 8 2 2 Dual Evaporator Long Hose Systems 6 8 2 3 System Refrigerant charges greater than 56 oz 1600g 7 Diagnosis Confirmation Of Compressor Failure 7 1 Compressor Rotation 7 2 Clutch Inspection 7 2 1 Voltage Test 7 2 2 Air Gap Test 7 2 3 Coil Resistance Test 7 3 Pressure or Pumping Test 7 4 Leak Checking 7 4 Visual 7 4 2 Soap bubble 7 4 3 Electronic 7 4 4 Dyes 7 5 Noise 7 5 Non Compressor 7 5 2Compressor 8 Compressor Repair 8 1 Clutch Removal 8 2 Clutch Installation 8 3 Cylinder Head Replacement 9 Compressor Replacement
3. Flush was not completely removed from system before evacuation started Refrigerant is trapped in refrigerant oil from previous charge 10 2 2 Vacuum Pump Service e Vacuum pumps not receiving regular service will be unable to draw an adequate vacuum In most cases simple changing the pumps oil will correct the problem Be sure to follow the manufacturer s recommendations for any maintenance on your evacuation pump Change the oil after use while the oil is still hot because contaminants are still in suspension and will be removed with the oil If contaminants cool solidify and stay in the pump they lower vacuum efficiency In extreme cases the oil stops lubricating and the pump seizes The only way to determine oil condition is to test vacuum pulled with an electronic vacuum gauge Contamination cannot be determined by oil color 10 3 Charging the A C System 10 3 1 Charging systems e Electronic weight scales e Charging stations Safety Note e Never open the high side service valve with the system running This can damage equipment and cause bodily injury Two ways to charge the system 10 3 2 Through the high side with A C system off e Charge systems that heat the refrigerant will force the correct charge amount into the system Once the full charge has been dispensed the service valve must be closed and the A C system can be started 10 3 3 Through the low side with the system running e Charge systems with out heating capa
4. 9 1 Contamination Inspection 9 2 Oil Amount No Contamination 9 3 Oil Amount Flushed System 10 Service Procedures 10 1 Flushing 10 1 1 Equipment types 10 1 2 Safety 10 1 3 Acceptable Flushing Fluids 10 1 3 Components to Flush 10 1 4 Flushing Tips 10 1 5 Removal of Residual Flushing Fluid 10 2 Evacuation 10 3 Refrigerant Charge 10 3 1 Charging Systems 10 3 2 High Side Charging 10 3 3 Low Side Charging 10 4 System Oil Balance 10 4 1 Oil flow 10 4 2 In Laboratory Oil Amount Determination 10 4 3 Oil Checking 1s Not Required Under Normal Conditions 10 4 4 Circumstances When Oil Addition or Balancing 1s Required 10 4 5 Oil Addition during Component Replacement 11 Warranty 11 1 Return Process 11 2 Warranty Duration 12 Compressor Failure Causes 11 1 Overheating 11 2 Contamination 12 3 Clutch Slippage 12 4 Handling or Impact Damage 13 Tools 13 1 Special Service Tools 13 2 Standard Tools 1 0 Compressor Models Covered SD7H15 HD SHD SD 709 SD7B10 SD5H09 SD 505 SDSHtE BUET 5 Cylinder SD5H11 SD 507 LTITe R 34a RI SD7B10 SDB 706 7 Oylinder SD7H13 SD 708 SD5H14 SD 508 SD 510 2 0 Compressor Nomenclature R 134a SD 7 H 15 HD Sanden Number Port Approximate HD Heavy Duty wobble plate of Location Displacement SHD Sealed HD piston type pistons B Body In CC s divided by 10 compressor H Head SD 709 Sanden Number Approximate wobble plate of pistons Displacement piston type In Cubic I
5. Power steering pump if present Loose engine mount bolts Idler pulley for automatic belt tensioning 15 7 5 2 Unusual Noises Due to Compressor e Suction pressure less than about 6 psig can cause unusual noise Charge refrigerant to proper amount and test by applying heat to evaporator to increase suction pressure e Clutch bearing e Oil level insufficient oil can cause unusual noise See Oil Charge in Section 6 8 e Compressor suction or discharge valve breakage will cause a clacking sound at idle e If head gasket failure occurs discharge pressure will be low and suction pressure will be high at idle 8 0 Compressor Repair Clutch Components cover screw Snap Ring a Eet cover Assembly pein Soto Ru Dust Cover Ring 8 1Clutch Removal 8 1 1 Armature Nut Removal 1 If armature dust cover is present remove the 3 or 6 bolts holding it in place and remove cover If auxiliary sheet metal pulley is present remove the screws holding it in place Then remove pulley 2 Insert pins of armature plate spanner into threaded holes of armature assembly 3 Hold armature assembly stationary while removing retaining nut with 3 4 19mm or 14mm socket wrench as appropriate 16 8 1 2a Key Shaft Armature Removal 4 8 1 2bSpline Shaft Armature Removal 5 6 8 1 3 Remove Clutch Accessories 8 1 4 Rotor Pulley Assembly Removal Remove rotor snap ring Hemove armature plate assembly using puller T
6. 7mm and sealing face of the cylinder block has a 4 1 2 114 7mm diameter step 1 Coat new block gasket with clean 5GS refrigerant oil 2 Install block gasket Align new gasket to location pin holes and orifice s Notch if present should face same direction as oil plug or adaptor 3 Place valve plate on cylinder block with discharge valve retainer and nut facing up away from cylinder block and location pins properly located in holes 4 Use vacuum pump and small tube to remove residual oil from each bolt hole If this step is not performed hydraulic pressure can be created when the cylinder head bolts are tightened This pressure can break the cylinder block 5 Coat head gasket with clean 5GS refrigerant oil 6 Install head gasket cover location pins checking for correct orientation 20 7 Install cylinder head 8 Install cylinder head bolts and tighten in a star pattern Torque first to approximately 14 ftelbf 19 6 Nem 200 kgf cm then finish by torquing to 24 27 ftelbf 32 4 36 3 Nem 330 370kgf cm fe Pet LOS W O ON ge SEN je E el f QUU gs O SD 5 9 0 Compressor Replacement e It s critical for successful compressor replacement that the new compressor is installed in a clean system with a correct oil charge Contamination remaining in the system will be pulled into the new compressor and lodge under the valves and in bearings causing quick failure of the new compressor Also
7. guide lines When developing new HVAC systems it s recommended to consult your compressor supplier for application specifics B 9 1832s5 60s2 4 198 5 90 2 6 2 Speed Rating Max RPM ees 0 MaxRPM BER ias Downshif SD5H14 6 000 7 000 SD5H14 4 000 6 000 SD7B10 6 500 9 300 6 3 Basic Compressor Specifications Displacement Typical Weight Ib kg Model Refrigerant SD5H09 R134a 5 3 87 7 9 3 6 4 3 1 9 12 3 5 6 CW only SD5H1 1 R134a 6 6 108 10 2 4 6 4 6 2 1 14 8 6 7 9 5 155 6 4 Assembly Torques lem ft IDb N m kgf cm Hose fitting 1 14 rotolock Clutch dust cover screws 3 1 4 20 6 5 Mounting 6 5 1 Compressor Rotation Compressor can be rotated 90 clock wise or Horizon counter clockwise keeping the oil fill plug above the 3 00 or 9 00 positions Oil Fill Plug 6 5 2 Mounting Ear Deflection A Distance Compressor Model SD505 SD5H09 SD507 SDSHII SD7H1B STEM SD508 SD5H14 WN au SD709 SD7HI5 83 3 mm ru eg d SD510 Less than 2 mm 007 in in either direction e Total combined ear deflection or bending cannot exceed A mm 016 in or 2 mm per ear Mounting brackets allowing extreme ear bending will cause gaskets to leak refrigerant leak 6 6 Recommended Pressure and Temperature Conditions 6 6 1 Discharge gas conditions Short term peak 430 psig max short idle or short acceleration time
8. it s important to maintain the original OEM oil charge amount when replacing the compressor 9 1 Contamination Inspection e Contamination from foreign material can be found by looking at the oil drained from either the compressor or the suction and discharge lines Contamination can also be seen collecting in the orifice tube or expansion valve Example of contamination collected on inlet side of orifice tube requiring system flushing Clean oil is clear or translucent verheated oil is dark Contaminated oil with and will require flushing metal particles will require system flushing 21 To illustrate how contamination will quickly wreck a good compress the photo to the right shows a small metal shaving lodged under the discharge valve The valve will open and close against the metal shaving resulting in a fatigue break of the valve The broken valve is now free to travel inside the compress causing additional internal failures Eventually the compressor will stop pumping and over heat A ke 1 ur t 7 H EX D r T t Section 10 1 page 23 provides information on flushing practices 9 2 Oil Amount Flushed System or New Systems Systems which have no oil in them due to flushing or the system is being built from new components will require oil amounts in accordance with the OEM s requirement Note The factory oil charge in many passenger cars and heavy trucks can be found on the compres
9. oz 240 cc you must drain 2 5 oz so the total in the compressor is 5 5 oz Note When araining the old compressor roughly 5oz will remain in the compressor as film coating all internal surfaces 27 11 0 Warranty 11 1 Warranty Process e Sanden International provides limited warranty for all compressors manufactured Customers wanting to return compressors for warranty consideration must contact the original equipment manufacturer or retail sales outlet from which the compressor was purchased 11 2 Warranty Duration e Sanden International warranty duration will vary based on a negotiated agreement between each individual OEM or retail distributor Please consult the OEM or Retail point from which your compressor was purchased for duration specifics 11 0 Common Causes of Compressor Failure 11 1 Compressor Overheated e Overheating is most often caused by loss of refrigerant charge Cool suction side refrigerant returning from the evaporator provides cooling for the compressor Once the refrigerant charge is lost there is no refrigerant entering the compressor hence no compressor cooling Blockages in the system will also prevent cool refrigerant flow to the compressor Normal center ball and gear set Overheated center ball and gear set 28 11 2 Compressor Contaminated There are several types of contamination the most common are e Foreign material like metal chips dirt and desiccant Resulting in broken int
10. seepage does not necessarily indicate leakage of refrigerant it should be considered a sign that a leak may exist Look for the following items e Oil seepage in shaft seal area between clutch and compressor repairable Pinching or extrusion of front housing O ring non repairable e Oil around cylinder head gaskets service valves fittings repairable e Oil around oil plug repairable e Stripped threads non repairable e Oil around crack in compressor body non repairable 7 4 2 Soap Bubble Detection e Soap bubbles are a means to detect gross leaks In general one very small bubble released per second is equal to 40 oz of refrigerant loss per year Finding leaks smaller than 40 ounces per year requires an electronic detector 7 4 3 Shop Type Electronic Detectors 14 Ensure that the detector being used is sensitive to R134a refrigerant Many leak detectors intended for R 12 cannot detect R134a leaks Use the leak detector in accordance with the manufacturer s instructions The leak rate at any portion of the compressor should not exceed 1 0 oz yr Make sure that a suspected leak is an actual flow of refrigerant not a small pocket of refrigerant trapped in a recess Cleaning the suspect area with soap and water never a solvent or blowing off the area with compressed air can help confirm a suspected leak Leak check procedures should be in accordance with SAE J1628 Electronic leak detectors meeting SAE J2791 are sens
11. Limited term 400 psig max extended idle or short acceleration time Long term continuous less than 300 psig Up to 4000 rpm for optimum life Max continuous temperature 280 deg F 300 F short term 6 6 2 Suction gas conditions e Minimum continuous 6 psig up to 4000 rpm for optimum life 6 6 3 Ambient Temperature e Non operational above 40 F and below 250 F e In operating mode the compressor should be above 32 deg F and below 200 Deg F Please note that in high ambient temperatures near turbo charger or exhaust maniflod heat is absorbed by the compressor this added heat must be rejected by the condenser High heat conditions can negatively affect sealing elastomers at hose connections Effort should be taken to keep the compressor as cool as possible for maximum durability 6 7 Clutch e Clutch Cycling rate less than 4 cycles per minute e Clutch Voltage Greater than 11 5 VDC for 12VDC systems e Clutch Voltage Greater than 23 VDC for 24 VDC systems e Power Draw 49 watts at 12 amp 24 Volts 6 8 Oil Charge e Oil Circulation Ratio OCR should be between 3 3 and 8 ratio of oil to refrigerant by weight 6 8 1 Oil Flow Theory e Compressor lubrication occurs as the oil which circulates with the refrigerant passes through the compressor crankcase during operation The Sanden SD series compressor achieves optimal durability and cooling performance when oil circulates through the system at a ratio of 3 396 to 8 oil to refrige
12. all system components with more collecting in cool components like evaporators accumulator and suction lines T sot Come i Expansion Condenser re N CY We Evaporator SEHE CH EIB E g EI H E g BHE Drier 1 E EI E QJEHE q H H E SBEE Cl El EI E JH HE AHILO JJ U U n gt Sup Se Ni rs N17 T T f During shut down oil settles through out the system collecting in all components Oil Replacement Amount During Service e When replacing a system component the goal is to restore to the original factory oil amount This amount can be found on the compressor label Use the chart below as a guide for restoring oil quantities when replacing system components SANDEN CORPORATION WADE Ti U S A Typical Oil Amount Typical Oil Amount Component E Geng E sar Major System Leak Suction Line To Rear Evaporator Accumulator Condenser Evaporator Equal to amount drained from old compressor Example Large truck with no leak requires new compressor suction hose Note New compressors are and drier delivered with full oil charge It will be necessary to add or Drain oil from old compressor 3 oz subtract from the delivered oil Oil remaining in old compressor 5 oz see note below E E Oil lost from old suction hose oz from table compressor equals the amount Oil remaining in old drier 1oz from table to be MI n Amount to be added 5502 Example If the new compressor contains 8
13. bility will have to use A C compressor to pull the required charge from the charge system When charging thought the suction side always use gas from the top of the charge system Liquid refrigerant charged into the suction line can cause damage to compressor valves 25 10 4 System Oil Balance 10 4 1 Oil Flow Compressor lubrication occurs as the oil which circulates with the refrigerant passes through the compressor crankcase during operation The Sanden SD series compressor achieves optimal durability and cooling performance when oil circulates through the system at a ratio of 3 3 to 8 oil to refrigerant Excess oil can act as an insulator limiting heat transfer in the evaporator and condenser while too little oil can negatively effect durability 10 4 2 In Laboratory Oil Amount Determination OCR While the vehicle A C is operating refrigerant samples are pulled from the liquid refrigerant line at several operating conditions These samples are weighed then the refrigerant is evaporated from the sample leaving oil which is weighed again Dividing the mass of the oil by the mass of the refrigerant plus oil will yield a ratio at the conditions the sample was taken This measurement is referred to as the Oil Circulation Ratio or OCR 10 4 2 Oil Checking Is Not Required Under Normal Conditions The mobile refrigeration system is a closed loop system hence it is not necessary to check or change oil in systems functioning normally and n
14. distributed throughout the entire system once the system is started Repeat steps 11 and 12 13 Re install oil plug Seal and O ring must be clean and not damaged Torque to 11 15 ftelb 15 20 Nem 150 200 kgfecm 7 Diagnosis Confirmation of Compressor Failure 7 1 Compressor Rotation Test The compressor is the most expensive component in the A C system loop Steps 7 1 through 7 4 should be used to determine if the compressor is functioning correctly or not and prevent removal of a good compressor Most internal compressor failures can be quickly identified by performing a shaft rotation test Normal rotation of the compressor shaft should be smooth without catching or binding Compressors which bind or hang during the shaft rotation test have an internal part which is broken or contamination preventing compressor operation This compressor should be removed and replaced with a new unit 12 7 2 Clutch Inspection 7 2 1 Voltage Check 1 Confirm that the clutch is receiving at a minimum 11 5 Vor 23 V for 12 V and 24 V systems respectively If voltage is not being received at the clutch run a diagnostic on the vehicle electrical system Note perform test with power applied to coil to fully load the circuit 2 Pulley or Rotor Spin Check 3 With clutch disengage the pulley should spin freely with no wobbling or roughness vibration 7 2 2 Air Gap Check 1 Air gaps exceeding 0 051 1 3 mm can prevent engage
15. ed at rear end of compressor If the compressor must be clamped in a vise clamp only on the mounting ears never on the body of the compressor Set rotor squarely over the front housing boss Place the rotor installer ring into the bearing bore Ensure that the edge rests only on the inner race of the bearing not on the seal pulley or outer race of the bearing Place the driver into the ring and drive the rotor down onto the front housing with a hammer or arbor press Drive the rotor against the front housing step A distinct change of sound can be heard when using the hammer to install the rotor Heinstall rotor retaining snap ring with external snap ring pliers If a bevel is present on the snap ring it should face up away from the body of the compressor Reinstall rotor bearing dust cover if present by gently tapping it into place 8 2 4 Armature Assembly Installation 1 Install clutch shims NOTE Clutch air gap is determined by shim thickness When installing a clutch on a used compressor try the original shims first When installing a clutch on a compressor that has not had a clutch installed before first try 0 04 0 02 and 0 004 1 0 0 5 0 1 mm shims 18 8 2 4a Keyed Shaft Only 1 Install shaft key with pliers 2 Align keyway in armature assembly to shaft key Using driver and a hammer or arbor press drive the armature assembly down over the shaft until it bottoms on the shims A distinct sou
16. ernal compressor components eventually locking up the compressor e Moisture from improper evacuation or hose permeation Moisture will corrode internal parts resulting in failure Moisture will create higher system pressures or freeze in the expansion device and blocking refrigerant flow e A C system flush 11 3 Clutch Slippage e The compressor clutch is simply two friction surfaces forced together like a set of brakes Each time the clutch is engaged some amount heat is generated If the engagements occur rapidly or the system voltage is to low excessive heat created will cause failure of bearing seals and or melting of the field coil epoxy 11 4 Handling or Impact Damage e otriking dropping or over torque will result in these types of damage 29 13 Tools 13 1 Special Service Tools L 1 Armature Plate Spanner 4 Lip Seal SD7 Seal Plate Tool 7 Shaft Seal Protective Sleeve 2 Armature Plate Puller 5 Armature Driver 8 Rotor Installation Driver 3 Rotor Puller Set 6 Rotor Puller Jaws 9 O Ring Hook 13 2 Standard Tools UI AU UM a ccc 1 External Snap Ring Pliers 4 Gasket Scraper 2 Internal Snap Ring Pliers 5 Graduated Cylinder 3 Feeler Gauges BEEN 30
17. h contain a flushing circulating pump to solvent clean using R134a 2 A closed loop flushing machine in which the circulated flushing fluid is returned to a reservoir for filtering and continued circulation Most of these machines provide a pulsing action to dislodge particles that are stuck in small passageways 3 A pressurized flush gun with a pulsating spray can also be used To use this technique block one end of a AC system component being flushed in order to build pressure inside the component and then quickly release the blockage to pulse the flushing solvent out Safety Do not use flammable fluids Protect eyes with safety goggles Wear chemical resistant gloves Use approved fluids CFCs R 11 113 or 115 and Methyl Chloroform also known as 1 1 1 Trichloroethane are not acceptable per the Clean Air Act 10 1 2 Acceptable Flushing Fluids e Fluids designated for AC flushing should be used and may be either solvent or lubricant based Fluids used to flush the system should meet SAE specification J2670 to insure compatibility with refrigerant oil and any materials used in the A C system 10 1 3 Components to Flush e Flush hoses hard lines and heat exchangers DO NOT flush the compressor accumulator or receiver drier refrigerant lines with mufflers thermal expansion valve or orifice tube because residual flushing fluid cannot be removed from these components and they restrict the flow of flushing agent through other components
18. he gar ae i l CAS ES cylinder head sl Y 19 o 6 8 3 2 Valve Plate Removal 1 8 3 3 Valve Plate and Cylinder Head Installation NOTE Carefully lift the cylinder head from the valve plate It is recommended that both the head gasket between the cylinder head and the valve plate and the block gasket between the valve plate and the cylinder block be replaced any time the cylinder head is removed However if no service is required to the valve plate it may be left in place If the valve plate comes loose from the cylinder block the block gasket must be replaced Carefully remove old head gasket from top of valve plate with gasket scraper Be careful not to disturb the valve plate to cylinder block joint if valve plate has been left in place If valve plate comes loose from cylinder block proceed to Section 8 3 2 Valve Plate Removal and replace block gasket Using a small hammer and gasket scraper carefully separate valve plate from cylinder block Be careful not to damage sealing surface of cylinder block Inspect reed valves and retainer Replace valve plate assembly if any part is damaged Carefully remove any gasket material remaining on valve plate cylinder block or cylinder head Do not damage sealing surfaces on components Large gasket OD of block gasket is 4 3 4 120mm and sealing face of block does not have a 4 1 2 114 7mm diameter step omall gasket OD of gasket is 4 1 2 114
19. hread 3 puller bolts into the threaded holes in the armature assembly Turn center screw clockwise until armature assembly comes loose The spline shaft armature will not have threaded holes to accept the armature puller Lift off armature plate with fingers If armature does not come off easily spray an anti seizes oil into shaft to loosen Armature plate can also be loosened by 2 gently prying between rotor and armature plate e with two flat screwdrivers Bearing Dust Cover if applicable SES SS Yj Shaft Key if applicable Shims Insert the lip of the jaws into the snap ring groove Place rotor pulley shaft protector Puller set over the exposed shaft Align thumb screws to puller jaws and finger tighten Turn puller center bolt clockwise using a socket wrench until rotor pulley is free 17 8 2 1 Field Coil Assembly Removal 1 8 2 Clutch Replacement 8 2 1 Field Coil Assembly Installation 1 8 2 2 Rotor Assembly Installation 1 Loosen lead wire clamp screw with 2 Phillips screw driver until wire s can be slipped out from under clamp Undo any wire connections on the compressor which would prevent removal of the field coil assembly Remove field coil snap ring Remove the field coil assembly Reverse the steps of Section 8 2 1 Protrusion on underside of coil ring must match hole in front housing to prevent movement and correctly locate lead wire s Place compressor on support stand support
20. itive enough to detect 1 7 oz per year leak rates 7 4 4 Leak Detection Dyes Leak detection dyes are to be used in accordance with the manufactures instructions Many OEM s now install dye during vehicle assembly so it may not necessary to add additional dye when inspecting for leaks Consult OEM documentation to confirm presence of dye before adding dye to the system Leak detection dyes work by staining the system oil So when adding dye to a system which did not initially contain dye the system will need to operate for some time to allow all the oil to become stained and arrive at the leak 7 5 Noise 7 5 1 Unusual Noise Not due to Compressor Unusual noises may be caused by components other than the compressor Compressor Mounting Check for Loose belt see belt tension specifications Broken bracket or compressor mounting ear Replace broken component Missing broken or loose mounting bolts Replace reinstall or tighten Flush fit of compressor to bracket and vehicle engine Replace any part not properly fitted Loose or wobbling crankshaft pulley Check for damage to pulley incorrect center bolt torque or center bolt bottoming Repair to vehicle manufacturer s specifications Bad idler pulley bearing Replace if necessary 7 5 1 Unusual Noise Not due to Compressor Continued Other Engine components Check for noise in Alternator bearing Air pump if present Water pump bearing Valves Timing belt or chain
21. lowing SAE standards are met RA R134a Refrigerant Purity J1990 J2099 Recycling Machine J1989 J2210 J2788 Note Recycling machines must be validated to the appropriate SAE standard and by Underwriters Laboratories Recycled refrigerant from other sources must meet the appropriate ARI standards Failure to comply with these provisions may void any warranty on the compressor 4 0 R 134a Information 4 1 R134a PAG Oil Handling Precautions As a conscientious member of the global community Sanden Corporation is committed to the elimination of CFC based refrigerants This manual focuses on service information for Sanden compressors intended for use with R134a and PAG oils 1 Always follow safety precautions described in section 3 0 2 Do not discharge R134a into the atmosphere Even though its ozone depletion potential is zero it does have global warming potential Recovery and recycling are mandated by the Clean Air Act Use recovery equipment designated only for R134a Never introduce another refrigerant into the R134a equipment 3 Never mix R134a with other refrigerants or A C systems failure may to occur 4 Use only Sanden specified PAG lubricants for R134a systems using Sanden compressors If other lubricants are used A C system failure is likely to occur 5 The Sanden specified PAG oils used in R134a systems absorb atmospheric moisture very quickly Moisture in the A C system can cause major damage or failure e Neve
22. ment his often is noticed after the clutch and compressor temperature is heated through normal use Refer to section 8 2 6 for more information setting correct gap 7 2 3 Resistance Check 1 Field coils with internal shorts can be tested by measuring resistance across the field coil Resistance should fall within these values e 12 Volt coil resistance should measure between 2 8 Q and 4 4 Q room temperature e 24 Volt coil resistance should measure between 14 Q and 18 2 Q room temperature 13 7 3 Pressure or Pumping Test e Compressors cause refrigerant to flow through the system by creating a pressure differential high and low pressures If the compressor can be forced to produce a high pressure in excess of 350 psig it is a good compressor Important This test must be performed with a full system charge Confirm the system is charged per the OEM requirement before proceeding 1 Disconnect electric engine cooling fan and bypass high pressure cut off switches The condenser can also be blocked with sheet of card board The purpose is to limit heat removal from the system and build compressor discharge pressure 2 Start engine and engage clutch 3 Compressors operating within specification should be capable of reaching 350 psig Important This test should only be run for a short time period Shut the system down immediately once 350 psig is achieved 7 4 Leak Checking 7 4 1 Visual Inspection Although oil
23. nches compressor 3 0 Cautionary Information 3 1 Pressure Release Before disconnecting any lines or removing the oil plug always make sure refrigerant has been removed from the A C system by recovering it with the appropriate recovery equipment When working on compressors separate from the system always be sure to relieve internal pressure first Internal compressor pressure can be relieved by removing shipping caps pads from both ports 3 2 Recovery of Refrigerant Never discharge refrigerant to the atmosphere Always use approved refrigerant recovery recycling equipment to capture refrigerant which is removed from the A C system Do not mix refrigerants in the same piece of equipment one should be designated for R 12 and another for R 134a 3 3 Handling of Refrigerant Always wear eye and hand protection when working on an A C system or compressor Liquid refrigerant can cause frostbite and or blindness 3 4 Ventilation Keep refrigerants and oils away from open flames Refrigerants can produce poisonous gasses in the presence of a flame Work in a well ventilated area 3 5 Avoid Use of Compressed Air Do not introduce compressed air into an A C system due to the danger of contamination 3 6 Warranty for Recycled Refrigerant The warranty offered by Sanden International U S A Inc on air conditioning compressors when used with recycled refrigerant will be the same as for new refrigerant provided that the fol
24. nd change will be noted if driving with a hammer 8 2 4b Spline Shaft Only 1 Align slot in armature with locator tooth on shaft Press armature towards rotor with hand until armature rests against the shims 8 2 5 Armature Retaining Nut 1 Replace retaining nut and torque to specification 1 2 20 20 25 ft lb 27 34 Nem 270 350 kg cm M8 11 15 ft lb 15 21 Nem 150 210 kgf cm 8 2 6 Air Gap Conformation 1 Check air gap with feeler gauge Specification is 0 016 0 031 0 4 0 8mm If gap is not even around the clutch gently tap down at the high spots 2 If the overall gap is out of spec remove the armature assembly and change the shims as necessary 3 Replace armature dust cover if used and torque 3 or 6 bolts to specification below e 1 4 20 bolts SD 5 2 4 ftelb 2 5 Nem 25 50 kgf cm e M5 bolts SD 7 5 8 ftelb 7 11 Nem 70 110 kgfecm Note Over torque of SD508 SH14 dust cover bolts will cause air gap to become out of spec amp 8 3 Cylinder Head Replacement E 8 3 1 Cylinder Head Removal a d MA K WI C Tw l 1 Be sure all internal compressor pressure has o s been relieved a N 9 2 Inspect cylinder head for fitting or thread damage e Pe In o OO N Replace if damaged i p CW 3 Remove cylinder head bolts i oe I J 4 Use asmall hammer and gasket scraper to Cw o a A separate the cylinder head from the valve plate ee Be careful not to scratch the gasket surface of t
25. on the armature retaining nut Measure and record the volume of the oil drained from the compressor compressor as a film coating the internal surfaces Add 0 5 fl oz 15cc to the recorded volume of the oil This is the calculated amount of oil in the compressor Compressor Oil In Compressor The amount of oil in the compressor after running for 10 RPM fl oz CC 15 minutes should be as per the table at right Determine from the table what the correct amount of oil should be for the particular speed used in step 3 The table shown applies to SD5H14 and SD7H15 compressors It is important that a quantity of oil remains in the crankcase after the test 12 Compare the desired amount of oil as determined in step 11 with the calculated actual amount of oil in the yenleie Open Doors d nedi 10 If th foil Blower Maximum Speed compressor determined in step 10 If the amount of ol Ambient Temperature minimum 75 F actually in the compressor amount drained plus 0 5 fl oz 15cc is less than the desired amount of oil add oil as necessary to the container and pour back into the compressor If the amount of oil actually in the compressor is too much remove oil from the container until the correct amount is reached Use the correct oil type as per Section 6 3 Note If results of step 12 show more oil is required add more than the difference between table amount and actual The reason is that the additional amount will be
26. ot in need of repair The system isolates the oil and refrigerant from moisture and contaminants while normal operating temperatures will be well below a point that will cause oil degradation 10 4 4 When Oil Addition or Balancing is required Compressor or component replacement Loss of refrigerant and oil mixture Adding oil to the system is required when refrigerant loss occurs due to leakage at any system component Since oil is held in suspension with the refrigerant oil will be lost with the escaping refrigerant gas Oil will need to be inspected for contamination during repairs to determine if flushing is required 10 4 5 Oil Addition When Replacing System Components A C systems are designed to have a given oil charge so during component replacement the goal should be to maintain the initial factory oil charge It is understood that system oil balance resulting from service activities is not an exact process however using these guidelines should roughly maintain the OEM system oil charge Operating conditions at the time of system shut down will determine where and how much oil settles in any given component in the A C system Therefore the exact amount of oil removed during refrigerant loss or component replacement can only be estimated in a shop environment Sanden recommends adding SP 15 oil using these guidelines 26 System Oil Amount e Oil circulates with the refrigerant during operation During off periods oil will settle in
27. oz 10ft x 11ft x 1 1 safety factor 4 6 oz 2 2 oz for total of 6 8 oz EMAL HU 12345670901 subtract the delivered oil amount from the desired total oil charge to determine how much oil should be added to the compressor and system 4 Re install oil plug Seat and O ring must be clean and not Remove the oil filler plug and charge the compressor with the amount of additional oil determined in step 3 Use only new oil of the correct type as shown on the compressor label If calculated amount is greater than 300cc 100z oil can be added to other system components damaged Torque to 11 18 ftelb 15 25 Nem 150 200 kgf cm 6 8 3 Systems Refrigerant Charge Greater Than 56 oz 1656 g of Refrigerant 1 2 10 Approximately 0 5 fl oz 15cc will remain in the 11 Charge system with refrigerant Set up the vehicle as follows a Doors open aM ur b Maximum blower speed S K i c Ambient temp at least 75 F 24 C Mar Ly Run the compressor at one of the speeds listed in the table Ka in section 6 8 3 step 11 Y ct x While maintaining engine speed turn off A C system and immediately turn off engine Recover refrigerant from the system Hemove compressor from vehicle Remove the oil plug and drain as much oil as possible into a suitable container Drain oil from the suction and discharge ports into a suitable container while turning the shaft clockwise only with a socket wrench
28. r leave PAG oil exposed to air for a prolonged time Tightly reseal the oil container immediately after each use e During A C system repair cap all fittings as soon as opened and leave capped until just before they are reconnected e lfarepair is performed on an R134a compressor or system evacuate the system for at least 30 minutes before recharging to ensure the removal of moisture which may have been absorbed by the PAG oil in the compressor and system 4 2 Table of Saturation Temperatures and Pressures R 134a ao Pressure e Teme LUM NE Tem P P GE mmm mmm 50 45 120 17 8 L3 158 EE Ee 70 7t 10 a 80 85 150 264 95 160 3 ae ST 15 15 L 114 20 485 5 0 Compressor Identification 5 1 Label Manufacturing location code 00 06 Japan 0 79 USA a 83 Singapore serial Number Month of manufacture 1 12 Year nof manufacture last digit I 123456 per CH 5 2 Manufacturing Date Codes Stamped on Compressor Manufactured in USA Only sanden internall D code Manufacturing date codes are stamped on the mounting e or boss at the front left of the compressor as seen when facing the clutch with oil plug or adaptor up Year of manufacture first digit i e 3 indicates manufacture in 1993 Month of manufacture last digit Jan Sept 1 9 Der X Nov Y Dec Z 6 0 Application Specifications 6 1 Belt Tension Note These specifications are
29. rant Excess oil can act as an insulator limiting heat transfer in the evaporator and condenser while too little oil can negatively affect durability e Oil will collect in low pressure cool components evaporator accumulator and suction hose of the refrigerant loop For example a long suction hose which sags can collect several ounces thus reducing overall oil circulation ratio 6 8 2 Oil Charging 6 8 2 1 Passenger Car Light Duty Truck Single Evaporator Refrigerant charges 240z 6809 to 400z 1133 e 135cc oil TXV systems e 240 cc oil in orifice tube systems 6 8 2 2 Dual Evaporator Long Hose Systems Less than 560z or 1600g of refrigerant charge 1 For a new compressor to be used in this type of system The desired oil charge for the systems with unusually long hoses such as trucks tractors etc can be determined based on the total refrigerant charge when less than 56 oz 16009 refrigerant is used Calculate the desired oil charge as below Oil amount oz Refrigerant charge in oz x 0 06 2 2 0 9 Oil amount cc Refrigerant charge in grams x 0 06 66 0 9 Note For systems with very long hose runs add an additional 1 0 oz 30cc of oil for each 10 foot of hose plus an additional 1 1 oz 33cc as a safety measure Long Hose Example A system w a 320z refrigerant charge and 11ft long suction hose Refrigerant Charge Suction Hose Length ped E Oil charge 320z x 0 06 2 2 0 9 1
30. recovery recycle machine to evacuate and charge the AC system The best method is to allow Nitrogen to flow through the components If Nitrogen is not available clean and dried compressed air can be blown through the flushed components until the flush liquid is evaporated 10 2 Evacuation e Evacuation is the process of removing air and moisture from the refrigeration system before charging the system with refrigerant Air or moisture remaining in the system before and during the refrigerant charge process will cause increased pressures during operation resulting in reduced or poor cooling and greatly Water Boils Under a Vacuum reduce the compressor life System Vacuum Boiling Point Inches Mercury Degrees F 10 2 1 Explanation of Evacuation 24 04 140 F e As vacuum is increased the temperature at which es e water boils drops As the water moisture boils its vapor can be drawn out of the system by the vacuum pump It is recommended to perform the evacuation process in a warm area The vehicle engine can also be run in order to warm up the components of the A C system to enhance the evacuation process 24 e Allow the vacuum pump to run for 30 minutes drawing down near to 30 Hg After 30 minutes of evacuation close the service valves and turn off the pump Let the system sit for 10 minutes if vacuum loss of 2 or greater occurs there is probably a leak o Other reasons a vacuum cannot be held for 10 minutes after shut off
31. sor label Off highway or school bus applications often have the compressor amount plus additional oil for long hose application so be sure to consult the OEM procedures in these instances SERIAL NO 12345678801 Sanden service compressors are supplied with a full oil charge as indicated on the label above This amount is consistent with the original OEM charge used during vehicle build 9 3 Oil Amount Compressor swap no flushing 3 Remove the oil plug from the failed compressor Drain oil from the suction and discharge ports The goal of this procedure is to measure the oil amount in the failed compressor and adjust the amount in the new compressor to equal that of the failed Section 10 2 5 has more information on system oil balance and drain as much oil as possible into a suitable container into a suitable container while turning the shaft clockwise only with a socket wrench on the armature retaining nut Measure and record the amount of oil drained from the compressor 22 4 Dram oil from the new compressor following steps 1 and 2 5 Add oil back into the new compressor in an amount equal measurement taken in step 3 6 Re install oil plug Seal and O ring must be clean and not damaged Torque to 11 15 ftelb 15 20 Nem 150 200 kgf cm Be careful not to cross thread the oil plug 10 0 Service Procedures 10 1 1 Flushing Equipment types 1 Refrigerant recovery recycle machines whic
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