BOSS ISO 46 Hydraulic Oil – 4 Litre, for 700 Bar High Pressure Systems

The right oil for a 700 bar pump, in a 4 litre bottle that tops up a hand pump or fills a 3,000 cc power pack. ISO 46 grade, dyed blue so you can see where it has been.

Ways to buy

• 4 litre bottle – the standard top-up size.
• Bulk – call us for 20 litre and drum quantities.

Specifications at a glance

What is in the box

• One 4 litre bottle of ISO 46 hydraulic oil.

Specifications

How to choose

• Match the grade. ISO 46 is what these pumps are built around. A heavier oil makes a cold pump sluggish; a lighter one leaks past seals at 700 bar.
• Do not mix brands or grades in the same reservoir if you can avoid it.
• Buy more than you think for a first fill – a big power pack plus a long hose swallows several litres before the air is out.

Technicians Advice

High pressure oil is not the same job as tractor oil, and this is the one place people cut corners and pay for it. At 700 bar the film between the piston and the bore is measured in microns, so contamination that a low pressure circuit would shrug off scores a high pressure pump. Fill through a clean funnel, never straight from a bottle that has been sitting open in a workshop, and wipe the filler neck before you crack it.

Fill with every cylinder in the circuit fully retracted, to the level mark and no further – oil that is in the ram has to come back somewhere, and an overfilled reservoir blows the filler plug or the seal the first time you retract.

If the oil comes out milky, you have water in it, and water at 700 bar does not compress the way oil does. Drain it, flush it and find out where the water got in before you refill.

Official Datasheets

Complete your setup

Need help choosing? Call 1300 146 737 or email sales@mhfgc.com.au – real technicians, real answers.