///Direct-drive pump is noisy
Direct-drive plunger pumps
Direct-drive pump is noisy
New or louder noise from a crankshaft pump usually comes from the drive.
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
01Loose or worn belt
Most likely
A slipping belt squeals.
How to check: Check belt tension and wear.
| Photo | Art. no. | Description | Excl. VAT | |
|---|---|---|---|---|
 | 10377 | End Cap Wrench, 8007923
KMT |
€ 70.80 | |
 | 10511 | Dynamic Seal Assembly, SLPRO, 90K, 20479499
AssemblyKMT |
€ 159.60 | |
 | 11104 | Maintenance kit, KMT intensifier tools, 05072723
Repair kitKMT |
€ 898.80 | |
 | 12661 | Dynamic seal kit - Hyplex Prime, 050626-1
Seal kitKMT, Flow |
€ 95.00 | |
 | 11489 | Swivel maintenance kit, 007117-1
Repair kitFlow |
€ 274.80 |
02Motor bearings not lubricated
Possible
Dry bearings get loud.
How to check: Lubricate per motor maker; replace bearings if needed.
03Air in the inlet
Possible
Air or a starved inlet makes a knocking noise.
How to check: Check inlet fittings for air leaks.
Related problems
General advice based on manufacturer manuals and service practice. Always follow the manual of your machine. Not sure? .