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Bobcat 334 Hydraulic Cylinder Rebuild | Master the Repair & Seal Replacement

This Video is from the Youtube channel: “Homegrown Passion”. 

Learn how to rebuild a Bobcat 334 hydraulic cylinder step-by-step! This DIY repair tutorial shows the full hydraulic cylinder teardown, seal replacement, and leak test on a Bobcat 334 mini excavator—perfect for fixing a leaking cylinder and saving money on equipment maintenance.

In this detailed hands-on video, Doug and Katy from Homegrown Passion walk you through removing a blown cylinder in the field, breaking a stubborn gland nut with heat, using a Rhino spanner wrench, replacing every seal and O-ring, reassembling the cylinder, and pressure testing it back on the Bobcat. Katy jumps in with humor, commentary, and tool-handing to keep things fun along the way.

If your Bobcat’s hydraulic cylinder is leaking—or you just want to learn more about heavy equipment repair—this full rebuild tutorial is packed with value.

🔧 Tools Used

Rhino Spanner Wrench

Seal Expander

Pick Set

Breaker Bar

Torch for gland nut heat

Loctite

🧰 Equipment

Bobcat 334 Mini Excavator

🛠️ This Video Covers:

✔ Full teardown & cylinder removal
✔ Seal, O-ring, and wiper replacement
✔ Heat + spanner wrench gland nut removal
✔ Loctite, torque, and seal installation tips
✔ Step-by-step reassembly
✔ Final pressure test on the machine
✔ Katy assisting with tools & tightening the gland nut

Whether you run a farm, homestead, or construction business, learning how to rebuild your own hydraulic cylinders can keep your equipment running strong and save thousands in repair bills.

📺 Watch Next (recommended for end screen + cards):

👉 Katy Power Washing the Mule (fun cleanup video!)
👉 Homegrown Passion Equipment Maintenance Playlist –

💬 Have you ever rebuilt a hydraulic cylinder? Tell us what machine you’re working on — and drop any questions below. We love helping DIY mechanics and homesteaders!

#Bobcat334 #HydraulicRepair #HomegrownPassion #FarmEquipment #DIYRepair #HydraulicCylinder #BobcatMiniExcavator #BradwoodFarm #EquipmentMaintenance #HydraulicReseal #FarmDIY #MechanicLife

0:00 Intro – Katy Explains the Project
0:28 Cylinder Failure Story
1:00 Tools & Rebuild Kit Overview
2:20 Disassembly Begins
4:00 Removing the Piston Rod
5:00 Loosening the 800 ft-lb Gland Nut
7:00 Katy Heating the Bolt
8:00 Nut Finally Breaks Loose
9:00 Moving to Workshop for Seal Rebuild
12:00 Installing New Seals and O-Rings
17:00 Gland Fully Reassembled
18:00 Reinstalling Cylinder on Machine
22:00 Katy Tightens the Gland Nut
27:00 Final Assembly & Hydraulic Fluid Refill
33:00 System Pressure Test
34:30 No Leaks – Project Success
34:45 Katy Wraps Up the Video

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