Quick answer: if a YT28 has weak or unstable flushing, do not compensate by simply opening the water supply further. First verify the water source under flow, the 13 mm reference water hose, hose restrictions, the water tube and drill-steel center passage, and then the air-water linkage or injection-valve components. If water is entering the lubrication side of the drill, stop and correct the cause before continuing: excessive water pressure, a damaged water needle/tube, blocked passages, worn seals, or incorrect drill-steel geometry can all contribute.
The current PerfoMax YT28 page confirms a 34–42 mm hole range, H22 × 108 mm shank, and that wet drilling plus the water connection must follow the supplied manual and quoted configuration. It does not publish one universal water-hose or working-water-pressure value. The Ingersoll Rand YT28 manual specifies a 13 mm water hose, while several other published YT28 references show approximately 0.2–0.3 MPa working water pressure. Treat those as model-family references only; the final supplier manual and quotation control the supplied PerfoMax configuration.
Why Water Flushing Matters on a YT28
A YT28 is not intended to be treated like a dry pneumatic breaker. Ingersoll Rand's YT28 product manual identifies the machine as suitable for wet drilling in medium and hard rock, specifies a 13 mm water hose, warns not to operate the tool without a water tube, and provides a dedicated strong-flushing control position. Water is routed through the drill and the hollow drill steel toward the bit so that cuttings can be cleared from the hole while the face is being drilled.
That means a water-flushing problem can appear as a drilling-performance problem. A blocked or unstable water circuit may contribute to poor hole cleaning, rising resistance around the drill steel, erratic penetration, and a greater chance that operators misdiagnose the problem as “low impact” or “not enough feed.” Conversely, excessive or misdirected water can enter areas intended for oil-lubricated pneumatic components and create hard starting, contaminated lubricant, corrosion, or reduced drilling speed.
YT28 Water-Flushing Reference Points
| Item | Reference / Check | How to Use It |
|---|---|---|
| Water hose ID | 13 mm in the Ingersoll Rand YT28 manual and current common YT28 references | Use as a preliminary hose-size check; long runs, restrictions and local fittings still need review. |
| Water tube | Required by the YT28 manual | Do not operate the drill with the water tube omitted or damaged. |
| Drill-steel water passage | Must align with the machine water tube/needle | An off-center, blocked or incorrectly finished center passage can restrict flushing or damage the water needle. |
| Control | YT28 manual includes a strong-flushing control position | Use the supplied model's control instructions rather than improvising with supply pressure. |
| Working water pressure | Not fixed on the current PerfoMax page; third-party YT28 references commonly list about 0.2–0.3 MPa | Confirm the allowed range on the quotation/manual for the actual supplier and revision. |
| Wet drilling | Part of the intended YT28 operating concept | Include water source, hose, fittings and flushing checks when commissioning the drill. |
Symptom-to-Cause Diagnostic Table
| Symptom | Likely Checks | First Action |
|---|---|---|
| Little or no water at the bit | Closed/low source, kinked hose, blocked fitting, blocked water tube, blocked drill-steel passage, linkage/valve fault | Stop drilling, isolate supplies, and verify the circuit from source to bit in sequence. |
| Water starts strong, then fades | Source pressure collapse under flow, filter/valve restriction, hose kink, debris moving in the circuit | Measure/check water delivery while the drill is actually flushing, not only static pressure. |
| Water appears in lubricator/oil side | Water pressure too high, failed seal, damaged water needle/tube, blocked downstream passage | Stop operation and correct the water-injection fault before adding more oil and continuing. |
| Drill becomes hard to start after water issue | Water ingress, over-lubrication/contaminated oil, water needle problem | Isolate the machine, inspect the water-injection components and lubrication condition. |
| Water needle repeatedly breaks | Off-center drill-steel center hole, excessive chuck/bushing clearance, wrong needle length, damaged mating geometry | Do not keep replacing needles without checking drill steel and chuck condition. |
| Flushing is acceptable at collar but poor deeper in the hole | Restricted drill-steel passage, cuttings packing, damaged steel, insufficient delivered water, drilling geometry | Check the full drill string and hole-cleaning path, not only the valve at the machine. |
| Strong water but penetration falls | Water entering lubrication side, excessive water setting, unrelated air/feed/bit problem | Separate flushing condition from air pressure, lubrication, feed and bit-wear diagnosis. |
7-Step YT28 Water-Flushing Troubleshooting Workflow
1. Make the system safe before opening any water component
Shut off and depressurize the air and water supplies before disconnecting hoses, opening valves, or removing the water tube. A pressurized hose or fitting can move unexpectedly. Do not troubleshoot a suspected blockage by placing hands or eyes in front of an outlet.
2. Verify the water source under actual flow
A static gauge can look normal while the supply collapses as soon as water flows. Check that the source valve is fully available, the branch line is not starved by other equipment, and the hose is not flattened or kinked. If the site uses a regulator, confirm its setting against the supplied YT28 manual rather than increasing it until flushing “looks stronger.”
For preliminary planning, many published YT28 configurations use a 13 mm water hose. If a site has substituted a much smaller hose, long hose runs and restrictive quick couplings can reduce delivered flow even when source pressure appears adequate.
3. Check the 13 mm hose, couplings, strainer and connection
Work from upstream to downstream. Look for debris, rust scale, crushed hose sections, damaged seals, partially closed fittings, and small-bore adapters. Clean-water quality matters because the injection mechanism contains small passages that can be restricted by sediment. A repeated “valve problem” may actually be contamination arriving from the site water line.
4. Inspect the water tube/needle and drill-steel center passage
The YT28 manual explicitly warns against operating without the water tube. The tube/needle must feed into the drill-steel water passage without being forced sideways. If the drill steel has an off-center center hole, a damaged shank end, or debris in the passage, the water component can be loaded mechanically instead of simply carrying water.
If a water needle has broken, inspect the root cause before fitting another. Manufacturer troubleshooting guidance for YT-series drills points to drill-steel center-hole alignment, excessive clearance at the hex/chuck area, needle length, and shank geometry as possible contributors.
5. Test the air-water linkage or water-injection valve
If the upstream supply and drill-steel passage are clear but flow still does not respond correctly to the drill controls, inspect the linkage/injection-valve system according to the supplied parts manual. Typical faults include blocked air or water passages, corrosion, a fatigued spring, or damaged sealing elements. Replace parts to the controlled model/revision rather than assuming all “YT28” internals are identical across manufacturers.
6. Check for water backflow into the lubrication side
Water where oil mist should be is a warning condition, not a reason to increase lubricator output. YT-series troubleshooting references identify excessive water pressure and water-injection faults as causes of water entering the lubrication area. This can dilute or displace lubricant, promote corrosion and make the drill difficult to start.
After correcting the cause, follow the supplied maintenance procedure to remove accumulated moisture and restore correct lubrication. The Ingersoll Rand manual instructs users, after operation, to remove the water tube and free-run the tool to blow out condensed moisture; it also stresses that proper lubrication is critical to tool life.
7. Re-test at controlled settings before returning to production
Reconnect the verified components, use the supplier-approved water setting, and confirm that water delivery responds normally through the drill and steel. Then test drilling at low/controlled power before full production. Watch for stable flushing, normal exhaust, normal lubrication film at the shank, and no evidence of water migrating into the air/oil system.
Why “More Water Pressure” Is Not a Universal Fix
A common field reaction to weak flushing is to open the water regulator further. That only helps if the real problem is insufficient delivered water and the new setting remains inside the machine's approved range. It does not fix a blocked center passage, a damaged water tube, an undersized fitting, a stuck injection valve, or a broken linkage.
It can also create a second fault. YT-series troubleshooting guidance specifically lists excessive water pressure as a cause of air-water linkage problems and flushing water entering the lubrication area. For that reason, water pressure should be treated as a controlled system variable, not as an unlimited cleaning force.
The current PerfoMax YT28 product page intentionally does not present a single universal water-pressure guarantee because supplier revisions can differ. If a buyer needs a controlled water-pressure value for a mine service-water design, request that number on the quoted data sheet before ordering.
Why the Water Needle Keeps Breaking
A broken water needle/tube is often treated as a consumable failure, but repeated breakage usually deserves a geometry check. The water component must remain aligned with the water passage through the H22 × 108 drill steel. If the drill steel's center passage is off center, the shank is damaged, the chuck/bushing clearance is excessive, or the water component is the wrong length for that revision, each percussion cycle can impose side loading.
For procurement, send the supplier the exact rock-drill model/revision and drill-steel shank specification rather than ordering a water needle by the generic term “YT28 spare.” If the current drill steel is locally made, verify its center-hole geometry and shank-end dimensions against the controlled drawing.
When Weak Flushing Is Actually a Drill-String or Hole-Cleaning Problem
If water exits the machine normally but the bit does not clean the hole, continue the diagnosis downstream. Check the hollow drill steel for internal restriction, the shank passage for deformation, the bit flushing path, and the actual hole condition. Cuttings can pack around the steel in fractured ground, especially when penetration continues after cleaning efficiency has fallen.
Do not use water-flushing diagnosis to ignore other variables. Low penetration can still come from inadequate air at the tool inlet, incorrect feed force, a worn bit, poor lubrication, drill-steel damage, or unsuitable rock/bit matching. For a broader machine diagnosis, see the YT28 rock drill troubleshooting guide. For feed-related symptoms, use the YT28 feed-force and collaring guide.
Daily Wet-Drilling Setup Checklist
- Confirm the water source is clean enough for the drill's small injection passages.
- Check the water hose against the 13 mm YT28 reference and inspect for kinks, crushing and damaged couplings.
- Depressurize before opening any water connection.
- Verify the water tube/needle is present, straight and correct for the supplied drill revision.
- Check the H22 × 108 drill steel for a clear, correctly aligned center water passage.
- Confirm the supplier-approved water setting before drilling.
- Test flushing response before full-power collaring.
- Watch for water in the lubrication/exhaust system or an abnormal change in oil condition.
- After operation, follow the manual procedure for removing residual moisture and maintaining lubrication.
What to Send Before an RFQ or Spare-Parts Order
Water-system problems are easier to solve when the supplier receives the actual interface data. Send:
- rock-drill model and manufacturer, not just “YT28”;
- serial number or revision/data-sheet photo if available;
- target hole diameter and typical hole depth;
- H22 × 108 drill-steel supplier, length and water-passage details;
- site water pressure measured while flushing, plus water-source type;
- water hose internal diameter and approximate hose length;
- photos of the water connection, water needle/tube and damaged parts;
- symptom: no flow, weak flow, intermittent flow, backflow, broken needle, or water in lubricant;
- whether the problem appears only while drilling or also during free flushing;
- required spare-parts quantity and whether a controlled parts drawing is needed.
For the current machine configuration, review the PerfoMax YT28 Air-Leg Pneumatic Rock Drill. The current page requires the water connection, hose, supplier and revision to be confirmed before quotation or substitution; use the controlled quotation/data sheet for the final water-service specification.
Frequently Asked Questions
What size water hose does a YT28 use?
The Ingersoll Rand YT28 manual specifies a 13 mm water-hose size, and 13 mm is also common in published YT28 reference configurations. Confirm the exact hose and fitting requirement on the manual/data sheet for the supplied machine, especially when long hose runs or site-specific couplings are used.
What water pressure should I use for a YT28?
Do not assume one number applies to every YT28 supplier and revision. Several published YT28 references list approximately 0.2–0.3 MPa working water pressure, but the current PerfoMax product page does not guarantee a universal value. Use the pressure specified in the controlled manual/data sheet for the quoted machine.
Why is water getting into the YT28 lubricator or air side?
Possible causes include excessive water pressure, a damaged water needle/tube, downstream blockage, seal or injection-valve faults, and incorrect drill-steel geometry. Stop operation, isolate both supplies and diagnose the water circuit before continuing; adding more oil without correcting the water path does not solve the cause.
Why does my YT28 have weak water flow even though source pressure is good?
Static source pressure does not prove delivered flow. Check the hose under flow, fittings and regulators, contamination, the water tube, the H22 drill-steel center passage, and the injection/linkage mechanism. A local restriction can create weak bit flushing while the source gauge still looks normal.
Can I run a YT28 dry if water is unavailable?
The Ingersoll Rand YT28 manual identifies the machine as suitable for wet drilling and states not to operate the tool without a water tube. Site operating rules and the supplied machine manual control the final procedure. Do not convert a wet-drilling setup to dry operation without explicit manufacturer approval and an appropriate dust-control plan.
PerfoMax YT28 System Matching
For a YT28 quotation, PerfoMax treats the drill, air leg, air supply, lubricator, H22 × 108 drill steel and water connection as a matched system. Review the YT28 product page, then send your hole size, rock condition, air supply, water service and drill-steel details for a technical quotation. If compressor delivery is also uncertain, see the YT28 air-compressor sizing guide.
Technical References
- Ingersoll Rand — Product Information Manual, Air Percussive Rock Drill Model YT28, Edition 2. Used to verify wet-drilling intent, 13 mm water-hose size, requirement for the water tube, strong-flushing control position, H22 × 108 shank and moisture/lubrication instructions.
- Atlas Copco — BBC 16 W Pneumatic Rock Drill. Used as an OEM reference confirming water-flushed, pusher-leg-mounted pneumatic rock drilling as a standard underground drilling architecture with Hex 22 tooling.
- Shenglida — Troubleshooting and Handling of Air-Leg Rock Drills. Used for YT-series water-injection fault patterns including excessive water pressure, blocked passages, water-needle failures, seals and water ingress into the lubrication side.