Kubota — Valve Seat Tightness Test
Testing & diagnosis · Injection Nozzle
From a Kubota service manual covering: Hurth HBW 100, Hurth HBW 125, Hurth HBW 150, Hurth HBW 250, Hurth HBW 35, Hurth HBW 50, M-25XPB, M-35B, M-40B. Check it applies to your exact model before use.
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Procedure
- Install injection nozzle to nozzle tester.
- Raise fuel pressure and keep at 1849 psi (12.75 MPa; 130 kg/cm2) for 10 seconds.
- If any fuel leak is found, replace nozzle piece.
Tools required
- nozzle tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1849 psi (12.75 MPa; 130 kg/cm2) for 10 seconds
Source: Kubota service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.