Lubrication Checklist for Plastic Injection Molding Machines

Plastic processing units in and around Ahmedabad run injection molding machines almost non-stop across shifts, and most of the breakdowns we get called about trace back to one of three things: wrong hydraulic oil grade, gearbox oil that’s overdue, or way oil that’s been skipped entirely because nobody remembered it needed separate attention.

This is meant to be a quick reference, not a long read. Pull it up next time you’re planning a lubricant order or doing a maintenance round.

Where oil is actually used on an injection molding machine

Hydraulic oil: what to check

• Confirm ISO viscosity grade against your machine’s OEM manual before topping up. VG 46 and VG 68 are both common, and using the wrong one affects clamping pressure and cycle time.
• Servo System HLP works for standard hydraulic circuits. For machines running higher pressure or needing longer oil change intervals, Servo System XLP Gold is worth considering.
• Check oil clarity monthly. Cloudy or milky hydraulic oil usually means water contamination, which is common in humid conditions and during monsoon storage.
• Filter condition matters as much as the oil itself. A clean oil poured into a clogged filter system will still cause pressure problems.

Gear oil: what to check

• Screw drive gearboxes run under continuous load, so a standard oil without extreme pressure additives wears out faster than expected.
• Servo Mesh or Servo Mesh XP grades are built for this kind of load and are worth the switch if you’re currently using a generic industrial gear oil.
• Change intervals should follow running hours, not a calendar date, since a machine running three shifts wears gear oil faster than one running a single shift.

Way oil: the one that gets skipped

• Way oil (also called slideway oil) is a separate category from hydraulic oil, even though people sometimes assume one oil covers both.
• It’s applied to guide rails and sliding surfaces to reduce stick-slip friction, which directly affects positioning accuracy on the mold.
• If your machine’s tie bars or platens are showing uneven wear patterns, check whether way oil is actually part of your maintenance routine or has been quietly skipped.

Barrel area grease

• The area near the heating barrel runs hot, and standard grease breaks down quickly there.
• Servo High Temperature Grease is a non-drop grease designed for exactly this kind of sustained heat exposure, and it’s a small cost difference for a part that’s expensive to replace if it fails.

A simple monthly routine

1. Check hydraulic oil level and clarity.
2. Check hydraulic filter indicator, replace if flagged.
3. Inspect gearbox oil level and note running hours since last change.
4. Confirm way oil has actually been applied to guide rails, not assumed.
5. Check grease condition near the barrel for signs of drying or discoloration.

Why this matters for cycle time, not just breakdowns

A lot of plants focus on avoiding breakdowns and miss that the wrong grade also quietly affects cycle time and part quality. Hydraulic oil that’s too thick slows clamping response. Worn gear oil increases screw drive resistance. Neither of these stops the machine, but both add up in scrap rate and output over a full shift.

Getting the right grades, consistently

Uma Steel Traders is an authorized Servo stockist supplying plastic processing units across Sanand, Ahmedabad, Viramgam, Mandal, Detroj, Banaskantha and Patan since 2016. We can help you match hydraulic, gear and way oil correctly to your specific machine model, and we keep enough stock on hand that a reorder doesn’t turn into a production delay.

Call us at +91 74340 10606 or check our Industrial Lubricating Oils page for available grades.