Kubota — Nozzle Injection Pressure Adjustment
Adjustments · 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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Before you start
- Spray nozzle velocity may penetrate skin and cause blood poisoning.
Procedure
- Install injection nozzle to nozzle tester.
- Slowly move tester handle to measure pressure at which fuel begins jetting out.
- If measurement not within standard value, disassemble injection nozzle and change adjusting washer until proper injection pressure obtained.
Tools required
- nozzle tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injection pressure: 1991 - 2133 psi (140 - 150 kgf/cm2) (13.73 - 14.71 MPa)
- Pressure variation with 0.001 in. (0.025 mm) adjusting washer thickness difference is approx. 85 psi (6 kg/cm2; 59 kPa)
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.