Txhawm rau daws qhov teeb meem qeeb qeeb ntawm Komatsu PC60-8 excavator, kev daws teeb meem yuav tsum tau ua raws li cov lus qhia ntawm "Quick Pre-inspection → Cav → Pilot/Hydraulic Main System → PC-EPC Solenoid Valve/Tump Control → Distribution Valve/Relief Valve → Circuit/ECU". Qhov chaw txhaum yuav tsum tau txiav txim siab los ntawm kev sib txuas qhov tseeb ntsuas ntawm lub siab, tam sim no, thiab cov ntaub ntawv ntws. Hauv qab no yog cov ncauj lus kom ntxaws, cov kauj ruam ua tau zoo thiab cov nqi tsim nyog.
- Kev nyab xeeb thiab kev soj ntsuam ceev ceev (Tshem tawm cov teeb meem hauv paus hauv 5 feebs)
Kev nyab xeeb Specifications
Nres lub cav → Tso lub siab nyob rau hauv lub ntsiab Circuit Court / tsav Circuit Court → Disconnect lub accumulator → Apply lockout-tagout kom tsis txhob yuam kev thaum lub sij hawm txij nkawm.
Kev soj ntsuam hauv paus
Hom thiab Kev Ua Haujlwm: Paub meej tias lub excavator yog nyob rau hauv P los yog H lub hwj chim hom nrog lub throttle teem rau siab tshaj plaws, txiav txim tawm tsis raug teeb meem xws li kev khwv nyiaj txiag hom los yog idle ceev txwv.
Cov roj Hydraulic: Xyuas kom cov roj theem nyob rau nruab nrab ntawm lub dipstick, roj kub ntawm 45-55 ℃ (preheat lub cav txias ua ntej), roj yog ntshiab tsis muaj npuas lossis hlau hais, thiab tsis muaj lim clogging tswb. Yog tias tsis muaj qhov xwm txheej, hloov cov roj thiab lim ua ntej.
Kev xau thiab kev sib txuas: Tshawb xyuas cov xau sab nraud hauv lub twj tso kua mis loj, lub ntsiab valve, cov kav dej, thiab cov pob qij txha. Loos bolts los yog clamps tuaj yeem ua rau poob siab.
Cov hlua khi thiab cov khoom sib txuas: Xyuas kom tseeb tias cov khoom sib txuas ntawm ECU, PC-EPC solenoid valve, ceev sensor, thiab lwm yam, tsis muaj xoob, dej nkag, thiab oxidation, thiab cov terminals raug crimped zoo.
- Kev Tshawb Fawb Sab Hauv Cav (Tshem tawm cov teeb meem ntawm lub zog)
| Cov khoom soj ntsuam | Txheem tus nqi | Txoj kev tshuaj xyuas | Fault Performance thiab tuav |
| Rated Ceev | 2200 ± 50rpm (qhov siab tshaj plaws) | Nyeem nrog tachometer lossis cov cuab yeej kuaj mob | Kev ceev tsis txaus → Tshawb xyuas lub tshuab rub lub cav / lub cev muaj zog, roj siab, roj injectors, thiab ntsuas lub tshuab hluav taws xob EFC |
| Roj Siab | Common rail siab ≥30MPa (tsis siv neeg ceev) / ≥140MPa (hnyav load) | Ntsuas ntawm qhov kev tsheb ciav hlau xaus nrog lub ntsuas siab | Tsis tshua muaj siab → Hloov cov lim lim, tshuaj xyuas cov roj nozzles, thiab ntsuas lub twj tso kua mis roj |
| Ceev Stability | Load fluctuation ≤50rpm | Nyeem cov ntaub ntawv ntws nrog cov cuab yeej kuaj mob | Kev hloov pauv loj → Txheeb xyuas qhov ntsuas nrawm, roj qhov dej ntws tawm, thiab ECU tswj cov laj thawj |
| Lub zog sib phim | Tsis muaj cav nres / ceev poob (hauv ± 50rpm) | Saib xyuas kev ceev thaum lub sijhawm ua haujlwm sib xyaw | Lub cav nres → Tshawb xyuas lub zog sib txuam ntawm lub twj tso kua mis thiab lub cav, thiab ntsuas lub PC-EPC solenoid valve |
- Pilot System Inspection (Kev tsav tsheb tsis txaus yog qhov ua rau lub tshuab qeeb qeeb)
Kev ntsuas qhov ntsuas siab: Pilot twj tso kua mis los yog tsav lub siab ntsuas qhov chaw nres nkoj ntawm lub ntsiab valve.
Tus nqi txheem: 3.3 ± 0.2MPa (33 ± 2kgf / cm²) ntawm ob qho tib si ceev thiab qhov siab tshaj plaws throttle.
Cov kauj ruam ua haujlwm
Ntsuas lub siab thaum lub tshuab ua haujlwm tsis muaj kev ua haujlwm. Yog tias lub siab qis dua 3.1MPa, kho cov tsav tsheb siab txo lub valve (ntxo lub txiv ntoo ntawm lub moos kom nce siab, 1/4 tig txhua zaus).
Yog tias lub siab tsis tuaj yeem hloov kho lossis hloov pauv tau zoo heev → Disassemble lub siab txo lub valve, kos rau lub valve core jamming, poppet hnav, thiab caij nplooj ntoos hlav qaug zog, ces ntxuav los yog hloov lub valve.
Yog tias lub siab tseem tsis tau hloov pauv thaum lub zog tswj tau ua haujlwm → Tshawb xyuas cov roj hluav taws xob thaiv hluav taws xob los yog sab hauv ntawm lub zog tswj valve, tom qab ntawd rov qab kho dua.
- Hydraulic Main System Siab thiab Flow Inspection (Core Performance Layer)
Main Pump Pressure (Teeb los ntawm Main Relief Valve)
Kev ntsuas qhov ntsuas siab: P1 / P2 qhov hluav taws xob ntsuas qhov chaw nres nkoj ntawm lub twj tso kua mis loj; kuaj ntawm qhov siab tshaj plaws throttle nrog lub siab ua kom muaj zog (piv txwv li, los ntawm kev tuav lub thoob pas nrig hauv txoj haujlwm thim rov qab).
Tus nqi txheem: 34.3 ± 0.5MPa (343 ± 5kgf / cm²).
Kev tuav tsis zoo: Tsis tshua muaj siab → Disassemble lub ntsiab nyem valve, tshawb xyuas lub valve core jamming / hnav thiab foob puas, ces ntxuav lossis hloov lub valve; Yog tias lub siab zoo li qub tab sis lub tshuab tseem qeeb → Tshawb xyuas lub ntsiab twj tso kua mis thiab PC-EPC tswj.
Cov twj tso kua mis loj (kho los ntawm PC-EPC Solenoid Valve thiab PC Valve)
Standard Logic: PC-EPC tso zis siab yog 3.5-4.5MPa thaum idling tsis ua haujlwm; siab poob mus rau xoom thiab tam sim no yog 160-260mA ntawm qhov siab tshaj plaws throttle yam tsis ua haujlwm.
Txoj kev tshuaj xyuas:
Nyeem PC-EPC tam sim no nrog cov cuab yeej kuaj mob: 850-1000mA ntawm qhov nrawm nrawm, 160-260mA ntawm qhov siab tshaj plaws throttle. Yog tias txawv txav, tshawb xyuas lub solenoid valve thiab ECU.
Ntsuas PC-EPC tso zis siab: Lub siab yuav tsum sib haum mus rau qhov tam sim no. Yog hais tias lub siab yog txawv txav → Disassemble thiab tshuaj xyuas lub solenoid valve rau valve core jamming los yog coil burnout, ces ntxuav los yog hloov nws.
Flow Calibration: Ntsuas lub ntsiab twj tso kua mis tso zis nrog lub ntsuas dej ntws. Tus qauv ntws tus nqi yog kwv yees li 120L / min (twin twj tso kua mis). Yog tias ntws tsawg → Tshawb xyuas qhov sib txawv ntawm qhov sib txawv thiab LS tawm tswv yim Circuit Court to.
- Kev soj ntsuam tob ntawm PC-EPC Solenoid Valve thiab Pump Control System (Electronic Control Core)
PC-EPC Solenoid Valve (Cov Ntsiab Lus Tseem Ceeb rau Kev Tswj Lub Ntsiab Hloov Pauv)
Kev ntsuas ntsuas tsis muaj zog: Coil kuj yog 10-15Ω. Hloov lub valve yog tias qhib Circuit Court lossis luv Circuit Court raug kuaj pom.
Fais fab-on Test: tso zis siab yog 3.5-4.5MPa thaum idling tsis ua hauj lwm; siab poob mus rau xoom ntawm qhov siab tshaj plaws throttle yam tsis ua haujlwm. Yog tias tsis yog, lub valve tseem ceeb yog jammed / hnav thiab xav tau kev tu lossis hloov.
Kev Xeem Ua Haujlwm: Tshem tawm lub PC-EPC connector. Yog tias tsis muaj kev hloov pauv hauv kev ua haujlwm → Lub solenoid valve faulty thiab yuav tsum tau hloov.
Main Pump Variable Mechanism (PC Valve / LS Valve)
Tshawb xyuas PC valve core rau jamming / hnav thiab xyuas kom lub caij nplooj ntoos hlav muaj elasticity ib txwm; txwv tsis pub, ntws tsis tuaj yeem hloov kho kom raug.
Rau LS bypass valve: Txheeb xyuas tias lub nplhaib sealing tsis muaj kev puas tsuaj thiab lub valve core kaw nruj nreem txhawm rau tiv thaiv LS siab to uas yuav ua rau kev tswj tsis tau.
- Kev tshuaj xyuas ntawm Distribution Valve thiab Pab Pawg Pab Pawg Valve (Tshem tawm Internal Leakage / Unloading)
Main Valve Core: Disassemble thiab tshuaj xyuas lub boom / thoob pas nrig / viav vias valve cores rau jamming / scuffing; xyuas kom meej qhov clearance yog ≤0.05mm. Sib tsoo los yog hloov lub valve tub ntxhais yog tias tsim nyog.
Unloading Valve: Xyuas kom cov tub ntxhais valve kaw nruj nreem thiab lub nplhaib sealing tsis muaj kev puas tsuaj los tiv thaiv cov roj tseem ceeb los ntawm ncaj qha ntws rov qab mus rau lub tank, uas yuav ua rau lub siab tsis ua haujlwm.
LS Bypass Valve: Ntsuas LS siab (≥2MPa thaum ua haujlwm). Yog tias qhov siab qis qis → Tshawb xyuas lub valve kom xau thiab hloov lub nplhaib sealing lossis valve core.
Siab Txo Valve / Check Valve: Tshawb xyuas lub siab txo lub valve thiab kos lub valve ntawm lub ntsiab valve kom ruaj khov thiab tsis muaj qhov to.
- Kev tshuaj xyuas Circuit Court thiab ECU (Tshem tawm hluav taws xob tswj lub teeb liab tsis zoo)
Fault Code Reading: Nyeem FM / IMM cov lej nrog cov cuab yeej kuaj xyuas, tsom rau P0216 (roj injector), P0193 (roj siab), thiab PC-EPC cuam tshuam txog qhov tsis raug, tom qab ntawd teeb meem raws li cov lej.
ECU Pin thiab Kev Sib Txuas Lus:
Kev Siv Hluav Taws Xob / Hauv av: ECU lub zog tas li yog 24V, qhov tseem ceeb ntawm lub zog hluav taws xob yog 24V, thiab av tsis kam yog <1Ω. Yog tias txawv txav, tshuaj xyuas fuses, relays, thiab cov hlua txuas.
CAN Bus: CAN-H voltage yog 2.5-3.5V, CAN-L voltage yog 1.5-2.5V. Yog tias qhov hluav taws xob tsis zoo, xyuas cov tsheb npav luv luv, qhib Circuit Court, lossis cov teeb meem ntawm lub davhlau ya nyob twg.
Sensor Calibration: Xyuas kom cov teeb liab los ntawm kev ceev, siab (P1/P2/pilot), thiab kub sensors nyob rau hauv tus qauv ntau yam. Calibrate los yog hloov sensors yog deviation loj.
- Qhov chaw txhaum cai thiab kev tuav pov hwm (Qeb los ntawm Zaus)
| Fault Phenomenon | Uas Tsis Txaus | Kev daws teeb meem |
| Lub tshuab qeeb qeeb + qis tsav siab | Pilot siab txo valve jamming / caij nplooj ntoos hlav qaug zog | Ntxuav / hloov lub siab txo valve thiab kho siab rau 3.3 ± 0.2MPa |
| Slow tshuab ceev + txawv txav PC-EPC siab | Solenoid valve jamming / coil puas | Ntxuav lub valve tub ntxhais los yog hloov lub solenoid valve, thiab calibrate tam sim no / siab |
| Lub tshuab qeeb qeeb + tsis tshua muaj siab | Internal to ntawm lub ntsiab nyem valve / unloading valve | Disassemble, ntxuav / hloov lub valve, thiab rov ntsuas siab rau 34.3MPa |
| Lub tshuab qeeb qeeb + lub cav nres | Kev tsis sib haum xeeb ntawm lub ntsiab twj tso kua mis thiab lub cav fais fab | Calibrate lub PC-EPC thiab tshuaj xyuas cov roj system kom phim lub zog nkhaus |
| Lub tshuab qeeb qeeb thaum kub (ib txwm thaum txias) | Hydraulic roj deterioration / lim clogging | Hloov cov roj thiab lim cov khoom, thiab ntxuav cov roj hluav taws xob |
- Cov cuab yeej tshuaj xyuas thiab ceev faj
Cov cuab yeej tseem ceeb
Pilot/main pressure test gauge (0-40MPa), tachometer, diagnostic tool (xws li, Komatsu IDSS), PC-EPC solenoid valve test wire, multimeter, flow meter.
Kev ceev faj
Siv cov txheej txheem txuas rau kev ntsuas siab los tiv thaiv kev sib tsoo thiab kev raug mob ntawm tus kheej; txo qhov siab ua ntej disassembly tom qab ntsuas.
Rov kuaj dua nrog lub cav kub tom qab txhua qhov kev hloov kho lossis hloov kho kom paub tseeb tias muaj txiaj ntsig zoo raws li cov qauv kev ua haujlwm.
Ua ntej siv cov khoom qub qub; Tom qab kev muag khoom solenoid li qub tej zaum yuav tsis txaus rhiab heev.
- Cov Txheej Txheem Kev Ua Haujlwm Zoo Tshaj Plaws (Ranked by Priority)
Kev tshuaj xyuas sai ua ntej → Tshem tawm hom, roj theem, xau, thiab teeb meem kev teeb tsa.
Cav → Ntsuas ceev, roj siab, thiab lub zog sib piv.
Pilot system → Ntsuas siab → Kho / ntxuav lub siab txo valve.
Main system → Ntsuas lub ntsiab siab → Tshawb xyuas lub ntsiab nyem valve / unloading valve.
PC-EPC → Ntsuas tam sim no / siab → Ntxuav / hloov lub solenoid valve.
Lub twj tso kua mis loj / xa tawm valve → Tshawb xyuas qhov sib txawv ntawm qhov sib txawv, cov tub ntxhais valve jamming, thiab sab hauv to.
Circuit/ECU → Nyeem cov lej txhaum → Tshawb xyuas cov pins, kev sib txuas lus, thiab sensors.
