LiftyK
Well-known member
In brief, any reason why my Jabsco twist and lock with new pump
- pumps out normally
- resists pumping out when the flush position is selected
The background
- the loo pumps everything into a holding tank. There is no diverter to select between tank and sea.
- the loo was working normally for years and then started to emit a dribble at the top of the barrel where the plunger goes in
- my plan was to remove the entire pump section, replace it with a new pump then service the old pump assembly and keep it on standby as a spare
- the only unusual thing I did when installed the new pump was to liberally apply silicone grease to the piston rubber
Upon testing the new setup, I found that
1. With the selector switch set to the right, pump out only, everything was perfect and no more leak. The handle moved up and down very easily.
2. With the selector set to the left, to flush and pump out, water was sucked in on the upstroke. Not a huge amount but it seemed normal. The effort required on the upstroke felt about right.
3. With the selector still to the left, the downstroke offered a lot of resistance. The piston wanted to bounce back near the bottom of the downstroke.
The flush setting downstroke has eased marginally over time, at least in my imagination. However I don’t understand how the handle is really easy to operate when pumping out the bowl but as soon as the selector is set to flush the downstroke offers so much more resistance.
Any ideas please?
- pumps out normally
- resists pumping out when the flush position is selected
The background
- the loo pumps everything into a holding tank. There is no diverter to select between tank and sea.
- the loo was working normally for years and then started to emit a dribble at the top of the barrel where the plunger goes in
- my plan was to remove the entire pump section, replace it with a new pump then service the old pump assembly and keep it on standby as a spare
- the only unusual thing I did when installed the new pump was to liberally apply silicone grease to the piston rubber
Upon testing the new setup, I found that
1. With the selector switch set to the right, pump out only, everything was perfect and no more leak. The handle moved up and down very easily.
2. With the selector set to the left, to flush and pump out, water was sucked in on the upstroke. Not a huge amount but it seemed normal. The effort required on the upstroke felt about right.
3. With the selector still to the left, the downstroke offered a lot of resistance. The piston wanted to bounce back near the bottom of the downstroke.
The flush setting downstroke has eased marginally over time, at least in my imagination. However I don’t understand how the handle is really easy to operate when pumping out the bowl but as soon as the selector is set to flush the downstroke offers so much more resistance.
Any ideas please?