Troubleshooting
What a 2000-hour service kit should actually contain
A 2000-hour service kit should cover the air filter, oil filter, separator and oil volume for your model. Keli-Parts configures kits and checks fitment first.
Quotations for the 'same' service kit can differ by half: one supplier lists three items, another lists six, and the buyer has to guess which package covers a real service. The gap usually comes down to whether the kit is complete for the interval or only covers the parts that fail visibly. For a typical screw compressor, a proper 2000-hour kit has a short, definite list.
Why 2000 hours is the reference interval
Around 2,000 running hours is the interval commonly used for screw compressor consumables — about once a year for a single-shift machine, two or three times a year on multi-shift duty. It is a convention rather than a law: the machine manual is the controlling document, and hot, dusty or humid sites shorten the practical interval.
Intervals and contents also differ by machine type and by manufacturer. Piston compressors carry a different parts list from screw machines, and model families within one brand can specify different oil charges — which is why a kit has to be configured per model, not assumed from size or appearance.
The three wear parts
On a screw compressor, three elements do the wearing. The air filter element takes in whatever dust your plant generates. The oil filter keeps the oil circuit clean between changes. The air-oil separator element separates oil from the compressed air and degrades with every running hour, and its condition directly affects how much oil carries over into your air line. A 2000-hour kit for a screw machine should include all three; replacing one while leaving the others is the classic half-service.
Oil — in the quantity your model specifies
Oil is where kits quietly go incomplete. Every compressor model specifies a charge volume, and a complete kit should state how much oil it includes for your specific machine rather than selling a generic container size. Running on a short charge shortens both oil and separator life; overfilling sends oil into the air line.
Ask, too, what oil the kit carries. Mixing oil types in a machine that has been running one product is a common cause of separator fouling, so the changeover should be deliberate, not accidental.
The risk of buying half a kit
The failure modes of a partial kit are quiet. A saturated air filter left in for another interval makes the machine work harder for the same air. Fresh oil circulated through an old oil filter carries contamination straight back into the circuit. An aged separator left in place limits what everything else you changed can achieve.
Changing the full set at one service resets the baseline: every part in the kit is new at hour zero, so the next interval starts from a known condition. That is also what makes maintenance plannable — one date, one kit, one service event, and line filter elements can ride along in the same order if their own interval is close.
Fitment: where generic kits fail
Two separator elements sold for the same machine model can still differ in thread, in bypass valve opening pressure, and in sealing surface dimensions. Get one of those wrong and the part either does not fit or does not protect the machine the way the original did. This is why Keli checks fitment before quoting: thread, bypass valve opening pressure and sealing face dimensions are confirmed against the machine — and, where available, the old part's numbers — before a price is sent.
Send the compressor model and the part numbers off the parts currently installed. Old numbers remove the guesswork and make the first delivery a fitting, not a return.
What Keli-Parts configures for you
Keli's range covers 3000+ standard parts — air filter elements, oil filters, air-oil separators, line filter elements and service kits — across screw and piston compressors, with kits assembled per machine model and fitment verified before any quotation. Quotations typically return within one working day and include packing information; MOQ starts at one piece, so a single-kit order for one machine is a normal order, and custom parts are available for special operating conditions.
Email your compressor model and old part numbers to sales@keli-parts.com or message WhatsApp +86 15757463901 — a fitment-checked kit quotation comes back within one working day.
