I have a small Honda 4hp water pump that won't pump. The volute and impeller look good. Obviously it won't prime. Does anyone know what the most common failure is? Will I need the mechanical seal or just some of the other seals? Any advice on what to look for to diagnose the problem would be appreciated. Thanks.
Honda Water Pump Needs Help
- Thread starter Believer
- Start date
Bob Rooks
Elite Member
- Joined
- Feb 27, 2007
- Messages
- 3,854
- Tractor
- Dozer (sold), Yanmar SV40 excavator, Skid steer (sold), Laser Dozer, Rotary trail cutter, 13 HP debris blower, 6X4 Gator. Giant G2700HD+ wheel loader.
Usually when a centrifugal pump won't perform there is excessive clearance between the impeller and the volute. In essence, the vacuum immediately breaks over to the discharge side. Did you try priming it? They are not totally self-priming you know.
Looking good and being within spec are two different animals.:laughing:
Looking good and being within spec are two different animals.:laughing:
Bob Rooks
Elite Member
- Joined
- Feb 27, 2007
- Messages
- 3,854
- Tractor
- Dozer (sold), Yanmar SV40 excavator, Skid steer (sold), Laser Dozer, Rotary trail cutter, 13 HP debris blower, 6X4 Gator. Giant G2700HD+ wheel loader.
You need a manual with the impeller clerance. On some pumps this dimension is obtained by adding or subtracting volute gaskets. Honda makes the engine, who makes the pump? There should be a tag on it somewhere. If it's one of those plastic volute / plastic impeller pumps you may be in for just a new pump
billhall
Member
I was having problems getting mine to work well the other day and it was as simply as the gasket between the supply hose and the pump had fallen out without me noticing.
20 20
Elite Member
I would say one of the easiest most common issues is a leaky suction, it might have a bad seal not tight crack........ I know my pumps can be tricky at times making sure everything is hooked up so it doesn't suck air.