Kubota — Fuel Tightness of Pump Element
Testing & diagnosis · Injection Pump
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
- Remove fuel injection lines and glow plugs.
- Install injection pump pressure tester to injection pump.
- Set speed control lever to maximum speed position.
- Turn flywheel ten times or more to increase pressure.
- If pressure cannot reach limit, replace pump element or injection pump assembly.
Tools required
- injection pump pressure tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.