///Water or wet abrasive comes back up the abrasive hose
Abrasive feed
Water or wet abrasive comes back up the abrasive hose
Backflow means the water cannot leave through the focusing tube. Stop: wet abrasive blocks the feed.
Safety first: Switch off the pump, release all pressure (open the on/off valve or bleed-down valve) and lock out before you open any high-pressure part. Never put a hand or tool near a running jet.
1Check the causes, most likely first
0 of 3 checked
01Blocked focusing tube
Most likely
A grain or debris blocks the exit.
How to check: Look through the tube against light.
| Photo | Art. no. | Description | Excl. VAT | |
|---|---|---|---|---|
| 10324 | Focusing tube 9.45 x 1.02 x 102
Focusing tubeKMT |
€ 129.00 | ||
 | 10867 | Focusing Tube 9.45 x 0.76 x 76.2, 05097944
Focusing tubeKMT |
€ 75.50 | |
| 10968 | Focusing Tube 9.45 x 1.02 x 76.2, 49835390
Focusing tubeKMT |
€ 75.50 | ||
| 10969 | Focusing Tube 9.45 x 0.91 x 76.2, 05116652
Focusing tubeKMT |
€ 77.02 | ||
| 11677 | Focusing tube 9.45 x 0.76 x 102
Focusing tubeKMT |
€ 129.00 |
02Misaligned orifice and focusing tube
Possible
The stream hits the tube wall.
How to check: Check that the parts sit square and clean.
03Nozzle touching the material
Possible
No standoff blocks the exit.
How to check: Keep about 1-3 mm standoff.
Related problems
General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .