Studi Kasus (1)
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ASSALAMUALAIKUM WR.WB
NAMA : DODY BOY VINALOSAASAL DAERAH : PALEMBANG
KELAS : 6 HNIS : 70210163
TEMPAT OJT : UT BATULICINOJT KE-2
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Tujuan mengambil tema troubleshooting pada OJT2 kali ini sebagai syarat untuk mengikuti final test.
Serta untuk menambah ilmu
pengetahuan tentang troubleshooting yg terjadi.
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Steering adalah suatu sistem pengendalian unit yang digunakan untuk membelokan arah dari gerak lurus menjadi ke kiri atau kanan sesuai kehendak operator.
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8 LANGKAH MELAKUKAN
TROBLESHOOTING
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Model uni : HD 465-7R S/N unit : J2O121
Lokasi : PT. JHONLIN BARATAMA
Engine model : SAA6D170E-5
Hours meter : 11581
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Presure Gauge
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Hydraulic TankDemand Valve
Steering ValveCross Over Relief ValveSteering
Cylinder
Hydraulic Pump
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CHECK LEAKAGE CYLINDER CHECK LEAKAGE HOSE AND PIPING
CHECK LEAKAGE STEERING VALVE
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Check Level Oli Hydraulic
Good Level
Check Relief Pressure Steering(Steering Cylinder Stroke End)
Standard :230 ±10 kg/cm²Actual :230 kg/cm²
Good Condition
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Check Relief Charge Pressure Steering Valve(Steering Cylinder Stroke End)
Standard :230 ± 10 kg/cm²Actual :110 ± 120 kg/cm²
× Bad Condition
Check Relief Pressure Load Sensing(Steering Cylinder Stroke End)
Standard :230 ± 10 kg/cm²Actual :230 kg/cm²
Good Condition
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Demand valve berfungsi untuk membagi aliran oli dari steering dan hoist pump dan juga untuk menjaga agar aliran oli yang menuju steering system selalu konstan.
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DARI DATA TERSEBUT BAHWA PENYEBAB TERJADINYA TROBLE PADA STEERING, YANG DISEBABKAN SPOOL DEMAN VALVE TERDAPAT SCRATCH, SEHINGGA SUPLAIAN OIL KE STEERING VALVE KURANG DARI STANDAR YANG SUDAH DITENTUKAN OLEH SHOOP MANUAL. KARENA SPOOL DEMAN VALVE TIDAK BERGERAK SESUAI FUNGSINYA.
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AFTER REMOVE AND CHECK TERNYATA TERDAPAT
SCRATCH PADA SPOOL DEMAND VALVE
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Spool deman valve terjadi scratch karena beroprasinya unit sudah mencapai Hm yang cukup lama, sehingga sering terjadi peningkatan dan penurunan suhu. Yang mengakibatkan penurunan kualitas atau daya tahan dari bahan pembuatannya.Serta pada saat maintenance itu sudah terjadi sebelum Hm tersebut,Tetapi hanya didiamkan saja.
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DEMAND VALVE
BROKEN
CHECK RELIEF CHARGE
PRESSURE STEERING VALVE
×
CHECK LEVEL OLI HYDRAULIC
CHECK RELIEF PRESSURE STEERING
CHECK RELIEF PRESSURE LOAD
SENSING
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INDEX
PART NO. DESCRIPTION Q’TY SERIAL NO.
1. 702-21-01502
VALVE ASS’Y ……………………………
1 J20121
2. O7OOO-F3035
O-RING ……………………………………
1 J20121
3. 07000-F3032 O-RING ……………………………………
1 J2O121
4. 07000-F3045 O-RING ……………………………………
1 J20121
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Replace Demand Valve Assy.Change O-Ring.
Testing And Travelling.Check Leakage
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Steering wheel menjadi berat dikarenakan suplai oli dari demand valve yang menuju steering valve kurang, suplai oli dari demand valve berkurang karena spool demand valve bergeraknya tidak maksimal.
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BATULICIN
JAKARTA
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Wassalamualaikum.wr.wb