Kubota — Changing the Raw Water Impeller
Maintenance · Raw water 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.
Browse Kubota generators & specs →
Before you start
- If any vanes have broken off the impeller they must be found to prevent blockage in the cooling circuit.
Procedure
- Close the raw water intake.
- Remove inlet and outlet port hoses; remove pump assembly and gasket.
- Remove the three hex head screws that hold the housing to the cover.
- Separate cover from housing; remove cover, O-ring, impeller gasket and plate.
- Remove the retaining ring (circlip) and pry out the impeller.
- Replace gasket, impeller and O-ring; lightly coat the housing inner surface.
- Install the cover housing and tighten the three hex screws.
- Mount pump finger tight, run engine at idle to align, then tighten screws.
Tools required
- Hex head screwdriver 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.