Komponen – Komponen Sistem Hidrolik
Bab
5 HIDROLIK DASAR Materi yang akan dibahas pada bagian ini adalah pengenalan pada sistem hidrolik, mencakup konsep dasar, komponen-komponen yang terdapat pada sistem hidraulik dan bagaimana komponen-komponen tersebut bekerja sama untuk menghasilkan kerja. Hidrolik tidak bisa terlepas dari dunia peralatan konstruksi dan penanganan material. Pada tahun 1950an sistem ini digunakan secara luas pada peralatan Cater pillar. Setelah itu sistem ini menjadi hal yang sangat diperlukan pada setiap machine produksi Caterpillar. Cylinder dalam berbagai jenis dan ukuran memberikan makna yang sangat berarti pada buckets, blades, backhoe dan truck bed . Hydraulic motor menggerakkan track, wheel, carbody dan conveyor . Brake, steering, transmis sion, suspension dan sebagian besar sistem pada kendaraan mengandalkan sistem hidrolik untuk tenaga dan pengaturannya. Bab ini akan membahas tiga topik antara lain : konsep dasar hidrolik, komponen-komponen dan sistem hidraulik sederhana.
Heavy Equipment Maintenance
120
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Komponen – Komponen Sistem Hidrolik
Komponen – Komponen Sistem Hidrolik
Diagram diatas menggambarkan sistem hidrolik dasar. Perhatikan bahwa saluran hidrolik memiliki warna yang berbeda. Warna ini mewakili perbedaan tekanan sistem. Komponen-komponen sistem hidrolik yang umum digunakan adalah: 1. Fluid , dalam hal ini oli 2. Tank 3. Filter 4. Pump 5. Control Valve Control Valve 6. Actuator 7. Line 8. Relief Valve Relief Valve 9. Cooler
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Komponen – Komponen Sistem Hidrolik
Fluida Fluida pada sistem hidrolik berfungsi untuk menyalurkan tenaga. Ini digunakan karena fluida tidak dapat dimampat kan (incompressible (incompressible). ). Bila fluida dipompakan ke sistem, maka gaya akan bekerja kesegala arah dengan sama besar. Mengingat fluida dapat menyesuaikan diri dengan tempat dimana ia tinggal maka fluida dapat mengalir ke segala arah dan ke saluran yang terbuka. Fluida yang digunakan pada machine Caterpillar umumnya adalah Oli. Tank Fungsi utama tangki hidrolik adalah : • Menyimpan oli • Mendinginkan Memisahkan udara dengan oli • Mengendapkan kotoran •
Filter Filter berguna untuk menyaring oli, untuk mencegah kerusakan komponen akibat oli yang kotor dan memastikan sistem bekerja dengan benar. Lokasi dan jenis filter pada sistem hidrolik bisa berbeda beda.
Pump Pompa akan merubah tenaga mekanis menjadi tenaga hidrolis dalam bentuk aliran oli. Pompa digerakkan oleh tenaga dari luar, misalnya engine. engine.
Control Valve Directional control valve menentukan arah aliran oli dalam sistem. Komponen ini digerakkan oleh operator.
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Komponen – Komponen Sistem Hidrolik
Actuator Actuator digunakan Actuator digunakan untuk merubah tenaga hidrolis kem bali menjadi tenaga mekanis untuk melakukan kerja. Ada dua jenis actuator yaitu actuator yaitu :. • Cylinders, Cylinders, menghasilkan gerakan lurus, digunakan untuk menggerakkan bucket, blade, booms dan implement lainnya. implement lainnya. Hydraulic motors menghasilkan gerakan putar, • digunakan untuk pergerakkan machine, steering machine, steering dan sistem lainnya. Lines Line (saluran oli) terdiri dari hose dan tube (pipa) diguna kan untuk tempat mengalirnya oli pada sistem. Hose sistem. Hose ber sifat fleksibel, bisa menyerap getaran, mengurangi kebisingan dan mudah dibengkokkan dan dihubungkan. Sedangkan tube lebih kaku namun daya serap panasnya lebih baik.
Relief Valve Relief valve, valve, atau pressure atau pressure control valve berfungsi untuk membatasi tekanan pada sistem. Valve akan membuka saluran ke tangki apabila tekanan dalam sistem melebihi tekanan yang sudah ditentukan sehingga tekanan dalam sistem akan sesuai dengan yang diperlukan oleh sistem tersebut.
Cooler Cooler berfungsi untuk mendinginkan oli hidrolik. Hal ini dimaksudkan untuk meningkatkan usia pakai komponen.
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Komponen – Komponen Sistem Hidrolik
Track loader mewakili machine dengan sistem hidrolik yang sederhana. Komponen utamanya antara lain : 1. Cooler 2. Pump 3. Lift Cylinders Lift Cylinders 4. Hydraulic Tank 5. Tilt Cylinder Tilt Cylinder 6. Control Valves Control Valves Cooler Cooler membuang panas dari oli sebelum masuk ke tangki dari sistem. Udara dari engine fan akan membantu mengeluarkan panas dari oli tersebut.
Pump Pump akan mengalirkan oli dari tangki menuju control valve.
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Komponen – Komponen Sistem Hidrolik
Lift Cylinders Lift cylinders menerima oli dari control valve untuk menaikkan atau menurunkan bucket .
Hydraulic Tank Hydraulic tank berfungsi sebagai tempat penampungan oli. Tangki dilengkapi dengan dua filter yang akan menyaring kotoran pada oli sebelum masuk ke tangki.
Tilt Cylinder Tilt cylinder menerima oli dari control valve untuk memposisikan bucket pada bucket pada rack back dan back dan dump. dump .
Control Valves Control valve memungkinkan operator untuk mengatur Lift dan Tilt cylinder dengan cara mengalirkan oli ke saluran yang benar. Oli kembali dari cylinder melalui control valve dan cooler menuju tangki.
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Komponen – Komponen Sistem Hidrolik
Fungsi Hydraulic Fluid Fluida memiliki berbagai kegunaan. Fluida yang digunakan harus dapat : • Memindahkan tenaga keseluruh sistem • Melumasi komponen yang bergerak • Melindungi komponen dari karat Menyerap panas dari komponen • Viscosity Salah satu hal yang paling penting pada oli adalah viscosity, viscosity, yaitu tingkat kemampuan/ketahanan oli untuk mengalir. Viscosity secara langsung berhubungan dengan kemampuan oli dalam melindungi dan melumasi komponen. Perbandingan Viscosity Viscosity oil yang tinggi akan menghasilkan gerakan implement yang seret dan membutuhkan tenaga tambahan untuk menggerakkannya. Sedangkan viscosity
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Komponen – Komponen Sistem Hidrolik
Additives Additive digunakan untuk mengatur viscosity dan karakteristik oli lainnya. Additif digunakan untuk mengurangi keausan, meningkatkan kestabilan kimiawi oli, menjaga agar komponen tetap bersih, mengurangi korosi dan oksidasi, dan menjaga agar kotoran tidak menggumpal sampai mencapai filter. Ini adalah alasan tambahan mengapa anda harus selalu menggunakan oli hidrolik yang direkomendasikan untuk machine untuk machine Caterpillar.
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Komponen – Komponen Sistem Hidrolik
Konsep Perubahan Tenaga
Untuk dapat melakukan pekerjaan yang berguna, sistem hidrolik harus merubah dan mengatur tenaga yang mengalir dari satu komponen ke komponen lainnya. Gambar diatas menampilkan proses pengubahan tenaga dari meka nis ke hidrolis kemudian ke mekanis lagi. Gear Train Sistem hidrolik harus menerima tenaga dari suatu sumber tenaga. Ini biasanya didapatkan dari tenaga mekanis putaran dari engine ataupun sumber lainnya. Pump Pompa hidrolik merubah tenaga mekanis menjadi tenaga hidrolis berupa aliran oli. Valves Valve mengatur perpindahan tenaga hidrolis melalui sistem dengan cara mengatur jumlah dan arah aliran oli.
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Komponen – Komponen Sistem Hidrolik
Perhitungan Kinerja Sistem
Kecepatan actuator merupakan fungsi dari (1) displacedisplacement (atau ment (atau volume) dan (2) flow (2) flow rate r ate (atau jumlah aliran oli dalam waktu tertentu). Apabila kedalam dua buah cylinder dengan cylinder dengan displacement yang berbeda dialirkan oli dengan flow rate yang sama maka cylinder dengan displacement yang lebih besar akan bergerak lebih lambat dibandingkan cylinder dengan displacement yang lebih kecil. Bila flow rate (jumlah aliran) dinaikkan maka kecepatan actuator juga akan meningkat. Langkah 1
Hitunglah displacement dari cylinder disamping. Displacement = piston area (1) x piston travel (2) Displacement = 32.3 cm² x 50.8 cm Displacement = 1640.8 cm³
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Komponen – Komponen Sistem Hidrolik
Menggunakan perhitungan untuk menganalisa masalah Hubungan antara flow rate dan displacement dapat merupakan alat untuk troubleshooting yang berguna. Cycle time suatu machine biasanya terdapat pada service pada service manual machine tersebut. Bila nilainya berbeda dari hasil pengujian maka hal menandakan adanya masalah. Ini adalah langkah pertama dalam mengidentifikasi penyebab dari kinerja yang tidak menentu atau seret. Hukum Pascal Bila suatu aliran oli dihambat, misalnya dengan adanya beban pada cylinder , maka akan timbul tekanan. Besar tekanan yang timbul dapat dihitung yaitu dengan cara membagi besar gaya pada cylinder dengan luas area dimana gaya tadi bekerja. Inilah penggunaan dari Hukum Pascal
Definisi Hukum Pascal “A force applied to a confined liquid is transmitted equally in all directions”.
Rumusnya adalah sebagai berikut : P=F÷A F=PxA A=F÷P Perhitungan Untuk membantu pemahaman anda terhadap rumus diatas, perhatikan simbol disamping.
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Komponen – Komponen Sistem Hidrolik
Kesimpulan Hukum Pascal dapat digunakan untuk menjelaskan hubungan antara pressure (tekanan), force (gaya), dan area (luas penampang). Rumusnya : P = F ÷ A “Besar tekanan (P) yang diperlukan untuk mengangkat suatu beban adalah sama dengan gaya dari beban tersebut (F) dibagi dengan luas penampang piston (A)”.
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Komponen – Komponen Sistem Hidrolik
Prosedur Keselamatan pada Hidrolik
Berikut ini adalah prosedur keselamatan yang umum yang harus diperhatikan pada saat kita melakukan pekerjaan yang berhubungan dengan sistem hidrolik. Sistem Hidrolik Caterpillar dirancang dengan memperhatikan aspek keselamatan dan bebas dari masalah. Namun demikian, sangat bijaksana kalau kita mengingat bahwa sistem dirancang kokoh dan kuat agar mampu melakukan pekerjaan-pekerjaan berat. Ini berarti bertekanan tinggi, olinya panas dan berbeban berat. Bila kita tidak mengikuti prosedur yang direkomendasikan maka
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Komponen – Komponen Sistem Hidrolik
Aktifkan parking Aktifkan parking brake, brake , turunkan atau ganjal implement dan stabilizer dan stabilizer . Matikan engine dan kuncilah transmissi. Buatlah tanda pada machine untuk memberitahukan pada orang lain bahwa machine tersebut sedang diperbaiki. Pastikan anda tidak melupakan langkah kritis ini. Tempat yang dianjurkan untuk meletakkan tanda ini adalah pada steering wheel atau steering lever . Periksa Operation & Maintenance Guide dan Service Manual untuk mengetahui prosedur mematikan engine yang khusus. Prosedur Menahan
Prosedur menahan akan berbeda antara satu machine dengan yang lainnya, tergantung komponen mana yang akan diperbaiki. Implement harus ditahan dengan menggunakan kayu, jangan pernah mengunakan beton. Pastikan penahannya cukup kuat untuk menahan beban dan dalam posisi yang aman. Beberapa machine dilengkapi dengan peralatan penahan khusus, contohnya : pada wheel loader terdapat bracket khusus untuk menahan agar machine tidak berbelok. Ingatlah untuk selalu memeriksa Operation & Maintenance Manual nance Manual dan dan Service Manual untuk Manual untuk prosedur mengganjal yang khusus.
Hilangkan tekanan sistem
Tekanan sistem harus diturunkan/dihilangkan sebelum
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Komponen – Komponen Sistem Hidrolik
Tangki Hidrolik
Tipe Tangki Hidrolick Terdapat dua tipe tangki yang digunakan pada sistem hidrolik, yaitu : 1. Vented , dimana udara dalam tangki berhubungan dengan udara luar 2. Pressurized , bertekanan yaitu tertutup dan tidak langsung berhubungan dengan udara luar, mencegah kotoran dan kelembaban agar tidak masuk ke tangki. Tekanan dalam tangki, yang didapatkan secara alamiah seiring dengan kenaikan suhu oli, juga akan membantu
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Komponen – Komponen Sistem Hidrolik
Accumulator
Tipe Accumulator Accumulator adalah reservoir (tempat menampung) oli hidrolik yang bertekanan tinggi. Ada tiga tipe accumulator , yaitu : 1. Weighted 2. Spring 3. GasGas-Charged . Fungsi Accumulator Oli bertekanan yang disimpan accumulator memiliki fungsi sebagai berikut :
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Komponen – Komponen Sistem Hidrolik
Filter
Fungsi Filter Filter menjaga Filter menjaga agar oli hidrolik tetap bersih dengan cara
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Komponen – Komponen Sistem Hidrolik
Pompa Hidrolik
Pompa hidrolik berfungsi merubah tenaga mekanis men jadi hidrolis dalam bentuk aliran oli. Bila aliran
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Komponen – Komponen Sistem Hidrolik
Pressure-compensated pumps merupakan variabledisplacement pumps yang dilengkapi dengan alat pengatur yang dapat menyetel pump output untuk mempertahankan tekanan sistem sesuai dengan yang diperlukan. Gear Pump Gear pump merupakan fixed positive-displacement pump. pump. Dengan desainnya yang sederhana dan kuat menjadikan pompa ini banyak digunakan dalam berbagai aplikasi. Pompa jenis ini banyak digunakan pada machine Catrepillar.
Cara Kerja Gear Pump Drive shaft memutarkan shaft memutarkan drive gear , menyebabkan idler gear ikut gear ikut berputar. Oli yang masuk melaui inlet port terjeba diantara gear dan housing akan housing akan terdorong keluar
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Komponen – Komponen Sistem Hidrolik
Piston Pump Piston pump dapat berupa variable atau fixed-displacement , tergantung rancangannya.. Pompa ini biasanya digunakan pada load sensing, pressure compensated hydraulic system. system.
Komponen Piston Pump Variable displacement piston pump terdiri dari : Drive shaft (1) , • • Cylinder barrel (2), • Port plate (3), • Pistons (4), • Slippers (5), • Retraction plate (6), dan
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Komponen – Komponen Sistem Hidrolik
Valve
Semua sistem hidrolik menggunakan valve untuk menggerakkan cylinder dan dan untuk mengatur tekan-
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Komponen – Komponen Sistem Hidrolik
Control Valve
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Komponen – Komponen Sistem Hidrolik
Directional Control Valve
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Komponen – Komponen Sistem Hidrolik
Check Valve Check valve dapat diklasifikasikan kedalam directional atau flow control valve. valve. Fungsi utamanya adalah untuk mengalirkan oli hanya kesatu arah. Dalam penggunaannya check valve biasanya dikombinasikan dengan valve lain.
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Komponen – Komponen Sistem Hidrolik
Flow Control Valve
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Komponen – Komponen Sistem Hidrolik
Pressure Control Valve
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Komponen – Komponen Sistem Hidrolik
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Komponen – Komponen Sistem Hidrolik
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Komponen – Komponen Sistem Hidrolik