挖掘机维修联系住友41-ac trouble shoot

1、1Trouble Shooting Instruction Air ConditionerSumitomo (S.H.I.) Construction MachineryNeo Power PAX Hydraulic Excavator234Control panel for Air-Conditioner buzzed continuouslyThe blow is not coolSee the page “The blower is not COOL”Anti-Overheat Control Device is workingThe speed of blower motor is n

2、ot ChangeableControl panel for Air-Conditioner buzzed continuouslyThe AC blow mode (foot or face) and air mode (open or close) are changeableAnti-Overheat Control Device is workingWhen the speed of blower motor does not work, is the AC mode “Face”?See the page “The speed of Blower Motor is not chang

3、eable”Is the door or window opened?NoYesLimit Control is working by the Door or the front windowLimit control device is working by “COOL MAX” situationPre-Study - 1 -Pre-Study - 2 -5Control panel for Air-Conditioner buzzed continuouslyMagnet Clutch does not workDoes the Magnet Clutch work on all con

4、dition except the air mode “FOOT”?Anti-Overheat Control Device is workingSee the trouble shooting “Magnet Clutch does not work”Blow air is not changeable in fresh or recycleControl panel for Air-Conditioner buzzed continuouslyQuantity of blow can not be adjustedAnti-Overheat Control Device is workin

5、gDoor or the front window is openedLimit Control Device is working by “COOL MAX” situationSee the page ”Blow air is not changeable in fresh or recycle”Pre-Study - 3 -Pre-Study - 4 -6Control panel for Air-Conditioner buzzed continuouslyA/C Mode is not changeableAnti-Overheat Control Device is working

6、The mode “Fresh air” and “recycle air” are changeable each otherSee the page “A/C Mode is not changeable”Pre-Study - 5 -7When auto switch or A/C switch are pushed, “HL.E” is displayed on the panel. “HL.0” through “HL.9” are displayed1) Connector for Air-Mix Motor Actuator is not connected.2) Failure

7、 of Air Mix Motor Actuator.3) Electrical current failure on Harness“SNOW” mark on the panel is flashed Repair or change the parts“SNOW” mark on the panel is flashed 1) Thermocensor in the cab and themocensor on evaporator are short at the same time.2) Failure on Controller1) Thermocensor or harness

8、are cut off or be short2) Connector of thermocensor is not contactedRepair or change the partsWhen “18.0” is set as a standard temperature and blow mode is changed to bent mode, blow is cooler than usual1) Connector of thermosencor on evaporator is not connected or cut off2) Thermocensor on evaporat

9、or are cut off or be shortRepair or change the partsAir Mix Damper is located ate the “COOL MAX”Cool Air is blowing into thermocencorIf Motor actuator does not move, measure the blowing power after checking the reason. Is the blowing power less than 1.5 kgf? Repair the ON/ OFF switch of Clutch of Co

10、mpressorRepair the Power CircuitSee the trouble shooting for freezing cycleController failure and thermosencor failureCheck the duct and remove factors caused cool air enteringRepair1) Check, repair, and exchange the lever on Motor actuator2) Spread the grease over the lever after it is cleaned upMo

11、tor Actuator failure or controller failureThe Blow is not COOLRepairA Y Refer to the MonitorRefer to the MonitorRefer to the “Monitor Mode” section8The Blow is not HOT“HL.0” through “HL.9” are displayed1) Connector for Air-Mix Motor Actuator is not connected.2) Failure of Air Mix Motor Actuator.3) E

12、lectrical current failure on the main harnessRepair or change the partsRepair or change the partsAir Mix Damper is located ate the “HOT MAX”Hot Air is blowing into thermocencorIf Motor actuator does not move, measure the blowing power after checking the reason. Is the blowing power less than 1.5 kgf

13、?Check the hot water lineController failure and thermosencor failureCheck the duct and remove factors caused cool air enteringExchange the Motor Actuator 1) Check, repair, and exchange the lever on Motor actuator2) Spread the grease over the lever after it is cleaned upMotor Actuator failure or cont

14、roller failureWhen auto switch or A/C switch are pushed, “HL.E” is displayed on the panelWhen “32.0” is set as a standard temperature and blow mode is “FOOT”, blow is hotter than usualRepair1) Thermocensor or harness are cut off or be short2) Connector of thermocensor is not contactedRefer to the Mo

15、nitor9Blower Motor dose not workThe amount of blow is “HIGH” and the both terminal(+)(-) are connected to the battery. (See the “Note 1”)Red line of the blower motor (from Main Power) is grounded on the batteryExchange the blower motor1) Check the blower motor relay2) When white / green line and red

16、 line of the blower motor relay are connected to each, the blower motor start to work(See the “Note 2”)Blue / black color harness of the blower amplifier are grounded by about 10 voltage Repair or exchange the controllerBlue / black color line and black line of the blower amplifier are connectedRepa

17、ir or exchange the wire harnessWhite / green color line of the blower motor relay is connected to the groundExchange the blower amplifier after removing the failureRepair or exchange the wire harnessWhen brown / red relay line of the blower amplifier is grounded, the blower motor start to workExchan

18、ge the relayRepair or exchange the wire harnessRepair or exchange the wire harness(Note 1) measure the voltage under every harness connected on (Note 2) For safety, A/C switch, main power switch, and light shall be off when you connect harness directly 10The speed of blower Motor does not changeable

19、“HL.0” through “HL.9” is displayed on the panelExchange the blower amplifier controller Repair or change the parts1) Thermocensor or harness are cut off or be short2) Connector of thermocensor is not contactedRefer to the Monitor11Magnet Clutch does not workWhen “AUTO” switch or “A/C” switch is on,

20、“SNOW” lamp is onThe “Snow” panel is flashed and “E” is displayed on the panelCheck the clutch fuseThe Clutch is connected with voltageHarness is connected with pressure switchExchange the compressor (Clutch failure)AC harness connector (white / red) connected to wheel is grounded to black lineFailu

21、re of pressure switch or error of refrigerant pressureA/C harness have some trouble Exchange harnessExchange controlASee the trouble shooting page “freeze cycle”12Blow air is not changeable in fresh or recycleThe indication for fresh/recycle on the control panel is flashed1) Contamination is attache

22、d to the lever of Motor actuator2) The lever of Motor actuator is broken 1) Motor Actuator connector for fresh/recycle air control is failed or not jointed2) Failure of Motor actuator3) Failure of main harnessExchange the motor actuator1) Remove the contamination2) Exchange the parts13A/C mode is no

23、t changeableThe indication of A/C mode (Human style) on the control panel is flashedThe rod of motor actuator is not released 1) Motor Actuator connector for fresh/recycle air control is failed or not jointed2) Failure of Motor actuator3) Failure of main harnessRepairAll of damper is not slippedChec

24、k or exchangeRepairAfter removing the rod, can move cam heavily (2 kgf over).Motor actuator failure or control failure1) Contamination attached on the Cum or damper2) failure of Cum or damper3) Movement failure caused by contaminationRepair1) remove the contamination2) exchange the parts3) spread th

25、e grease after washing Cum14Air conditioner does not work wellHighest pressure is not high and lowest pressure is not lowIf Compressor switch is off, the high pressure goes to the same pressure as the low pressure Failure of CompressorExchange CompressorHigh and low pressure changed at regular inter

26、vals. (When pressure is not changed, their level are normal)AC blow are not kept coolIt caused water entering to the cooler circuit Exchange the receiver dryer and add refrigerant after remove the waterTrouble Shooting for coolant circuit (1)Phenomenon and result of diagnosis Estimated reasonHow to

27、repair15Air conditioner does not work wellBoth high and low pressure are lower than usualAir balls are found on the Sight GlassOil spread into the pipe or parts (Leak Tester reacts)Gus is leaking from the combined parts with pipesBoth high and low pressure are higher than usualGo to the next page “A

28、1”Gus is leaking from hose alone caused by not adding refrigerant for a longtimeTrouble Shooting for coolant circuit (2)Phenomenon and result of diagnosis Estimated reasonHow to repairOil does not spread into the pipe or parts (Leak Tester does not reacts)Refrigerant is shortFill up refrigerant to t

29、he appropriate levelExchange the combined parts or pipesThe pipe of low pressure is not coolThe blow volume e small when A/C is working long timeGo to section “A3” on page 16Go to section “A2” on page 1516Too much of refrigerant Piping is mixed with air“A1”Failure of expansion valveTrouble Shooting

30、for coolant circuit (3)Phenomenon and result of diagnosis Estimated reasonHow to repairFailure of expansion valve (valve is not connected to thermostat pipe)Exchange the receiver dryer and add refrigerant after remove the waterRepair the thermostat pipe so that it can be connected to the valveKeep t

31、he refrigerant correct amountThe pipe of low pressure is not coolAir balls do not occur even if water is installed on the condenser (the receiver drier is still cool) When water is installed on the condenser, condenser es cooler (both low and high pressure go to the normal level)The pipe of low pressure is cool and a lot of water or frost is attached to the pipeAdjust the cork of valve or repair the valveGo to “A4” on page 1717Repair the expansion valve“A2”Trou