Field notes, sizing guides and component teardowns — written by engineers, for engineers.

Grease and zerk fittings: thread types, and the ones that seize

The smallest threaded part on the machine, in four thread families that all look alike, and the one that will not take grease at six in the morning is always the one you cannot reach.

Contamination during a field hose change: what gets in while the line is open

The pump that fails three weeks after a hose change did not fail by coincidence. Everything that ruins it entered during the twenty minutes the port was open.

Adapter stacking: when it is fine, and when it is the leak

Everyone stacks adapters. Nobody writes down where it stops being acceptable, so here it is — three rules, and the one arrangement that is always wrong.

What splits a female coupler half

A cracked female coupler body is not a manufacturing defect and it is not bad luck. It is almost always one of three things, and two of them are avoidable for nothing.

Where JIC is the wrong choice

JIC is the default on most of this continent and it deserves to be. It is also the wrong answer in four specific situations, and every one of them is a situation where people keep specifying it anyway.

BSPP bonded seals and dowty washers: getting the size right

A bonded seal is sized by the thread it sits under, not by the bore of the fitting or the size printed on the box. That one sentence resolves most of the confusion.

Trapped pressure: why the coupler will not connect, and how to release it safely

An attachment left in the sun all morning can build enough pressure in a disconnected line to make a coupler impossible to push home. Forcing it is the part that hurts people.

Cross-threaded or stripped port: repair it, insert it, or replace the block

What is recoverable depends on something most people never think about: whether that port seals on the thread or somewhere else. Get that question right and the decision makes itself.

Should you buy a crimper? The real economics of making your own hoses

Sometimes the answer is yes. The machine is rarely the expensive part, the dies usually are, and the thing that decides it is not cost at all — it is how far away your machines break down.

Photographing a fitting so someone can identify it without holding it

Four photographs and one measurement identify almost any hydraulic fitting remotely. Most requests arrive with one photograph taken at arm’s length, and that one settles nothing.

Removing a seized hose or fitting without destroying the port

The hose is scrap either way. The manifold behind it is not, and almost every expensive outcome here comes from a decision made in the first five minutes.