Troubleshooting Hydraulic Pressure Loss in Injection Molding Machines
Diagnose and fix hydraulic pressure loss problems in injection molding machines. Common causes, step-by-step troubleshooting, and replacement parts guide.
Mechanical Components
Screw Barrels & Seals
Screw barrel assemblies, hydraulic cylinder seal sets and piston rod nuts
Seals of a hydraulic cylinder
Point at a number or a part of the drawing.
The honed tube and the end caps hold the oil. Oil pumped into one end or the other moves the piston.
Holds the piston on the threaded end of the rod. It must stay tight: a loose nut lets the piston knock and damages the seals.
Separates the two oil chambers of the cylinder. Pressure on one side pushes it, and the rod with it.
Y-rings and wear rings in the piston grooves. They keep oil from passing the piston; worn piston seals make the cylinder creep and lose force.
Chrome-plated rod that carries the force out of the cylinder. Scratches or pitting on its surface quickly destroy the rod seals.
Guide ring, rod seal and wiper in the front head. The seal holds the oil in, the wiper keeps dirt out and the guide ring keeps the rod centred.
The barrel and screw supplied together as a matched set, with the screw head, ready to fit to the injection unit.
Filters Category, zone, brand
- MC-SB-01Seals & BearingsIn stock
Screw Barrel Assembly
Complete screw and barrel assembly for injection molding machine plasticizing unit.
- Seals & BearingsIn stock
- MC-SB-08Seals & BearingsIn stock
Hydraulic Cylinder Seals & Y-Ring
Hydraulic cylinder seal kits and Y-ring piston rod seals for injection molding machine cylinders.
- MC-SB-10Cylinders & SealsIn stock
Piston Rod Nut
Injection cylinder piston rod nut for Haitian and equivalent injection molding machines.
How these parts work
How each part works, how it wears and what to send for a replacement quote, with drawings.
- Machine zone guideBarrel and screw of an injection molding machineHow the barrel and screw of an injection molding machine work: screw zones, check ring, front flange, nozzle, signs of wear and what to send for a quote.
- Machine zone guideInjection unit of an injection molding machineHow the injection unit of an injection molding machine works: injection cylinder, piston rod, screw motor, guide columns, linear guides and common faults.
- Piston sealsWhat the piston seals of an injection molding machine cylinder do, Y-ring and compact seal types, wear rings, signs of bypass leakage, testing and replacement.
- BarrelWhat the barrel of an injection molding machine does, how it is built and heated, its temperature zones, nitrided and bimetallic bores, wear and replacement.
- Rod seals and wipersHow the rod seal, wiper seal and guide ring in the front head of an injection molding machine cylinder work, why they leak, and how to inspect and replace them.
- Replacing cylinder sealsStep-by-step seal kit replacement for an injection molding machine hydraulic cylinder: safety, dismantling, inspection, fitting new seals and testing.
- Piston rod nutWhat the piston rod nut does inside an injection molding machine hydraulic cylinder, how it is locked, the signs of a loose nut, and how to inspect and replace it.
- Shot size calculationHow to calculate shot size and barrel capacity on an injection molding machine: swept volume, shot weight for your material, stroke, cushion and capacity use.
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