Short answer
Automatic lubrication feeds grease continuously and in measured amounts while the breaker works, so the film between bushing and tool is never interrupted. It pays for itself fastest where the breaker runs long hours and the operator has no chance to get down with a grease gun: quarries, tunnels, continuous demolition. If the breaker runs a few days a month, or the operator greases reliably, manual lubrication is enough and the system will not return its cost. The decision rests on whether greasing is actually being skipped.
The problem is continuity, not quantity
With manual greasing, all the grease goes in at once at the start of the shift. There is plenty in the first hours; as the shift goes on it thins out, and in the last hours the bushing runs almost dry. Most of the wear happens in exactly those last hours.
An automatic system spreads the same total quantity across the shift. Because the film is never interrupted, metal-to-metal contact between bushing and tool disappears and dust is continuously pushed outward by the grease.
The gain should therefore be read as "an uninterrupted film", not "more grease". The same amount of grease buys longer bushing life.
Where it pays for itself
- When the breaker runs long hours: quarry, tunnel, continuous demolition. Manual greasing slips at that tempo.
- When the operator cannot get down: high faces, underwater work, sites open to traffic. If getting down is difficult, greasing gets skipped.
- Where dust is heavy: the second job of grease is pushing dust out, and an interrupted film invites it in.
- In a fleet: keeping discipline across several machines through people is hard; the system makes it uniform.
- When bushing and seal costs repeat: if the same breaker takes several bushings a year, the calculation is worth doing.
When it is unnecessary
If the breaker runs a few days a month the total hours are low; manual greasing is both sufficient and more flexible.
If the operator already greases reliably and bushing life is within the expected range, there is no problem to solve. The system does not spend money solving a problem that does not exist.
On short-term rental work, maintaining the system and sourcing cartridges is an extra burden, and the hirer usually prefers manual greasing.
Fitting the system and letting the grease run out
The most common failure of automatic lubrication is not a fault but neglect: the cartridge empties, nobody notices, and the breaker runs dry for weeks. Once a system is fitted, checking the cartridge level has to enter the pre-shift routine. Otherwise you end up worse off than with manual greasing, because now nobody looks at the grease gun either.
How to run the numbers
The comparison has two sides. On one, the cost of fitting the system and the grease cartridges it consumes. On the other, the reduction in bushing, seal and tool replacement frequency, and the downtime those replacements cost.
Counting downtime is critical and usually forgotten. A bushing change is not just the price of the part: the machine stops, the crew waits, sometimes it goes to the workshop. In a quarry, one day of downtime can cost more than the system itself.
Making that calculation needs records: which breaker, when, which part. In fleet operations those few lines move the decision from guesswork to measurement.
What changes once a system is fitted
- A "cartridge level" line joins the pre-shift check list.
- The supply line and fittings are inspected periodically; a broken line takes the system out of service silently.
- When the breaker is removed and refitted, the supply line connection is verified.
- Grease flows differently in winter; the system setting should be reviewed by season.
- The manual grease gun does not leave the site; it is the fallback if the system fails.