Kubota — Fuel Injection Pressure
Adjustments · Injection nozzle
From a Kubota service manual — check it applies to your exact model before use.
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Before you start
- Check after confirming that there is nobody standing in the direction the fume goes.
Procedure
- Set the injection nozzle to a nozzle tester.
- Slowly move the tester handle to measure the pressure at which fuel begins jetting out.
- If the measurement is not within factory specifications, replace the adjusting washer in the nozzle holder to adjust it.
Tools required
- Nozzle tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel injection pressure: 13.73 to 14.71 MPa (140 to 150 kgf/cm2, 1991 to 2134 psi)
- Pressure variation with 0.025 mm (0.0010 in.) difference of adjusting washer thickness: approx. 588 kPa (6.0 kgf/cm2, 85 psi)
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.