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Keel pump (Read 87 times)
Spaceman
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Keel pump
30.05.2019 at 12:30:11
 
Hi All

Just purchased a TS240 Trapper (No: 20) only just launched into the water of Langstone Harbour near Portsmouth. I have everything to learn about its foibles.


Question on keel pump: the manual handle seems to sweep through an arc of approx. 70% however only the last 15% become hard and do any pumping. This feels like air in the pump itself. Can anyone enlighten me as to how I bleed air from the pump. There doesn't appear to be any gross leak just a slight seepage (not sure from where). The keel can be raised however it takes hundreds of pumps, moving around 1 mm at a time.

Grateful for any assistance.  
Simon
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Paul
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Re: Keel pump
Reply #1 - 30.05.2019 at 21:14:46
 
Hi Simon,
Congratulations on choosing a super boat..
Keel pump problem is likely to be a failed seal.
I,m at Dell Quay and found that it was best to go to the specialists to identify
supply and fit.
I had mine done at hydraulic specialist in Fareham. Can't remember name but head south from centre over flyover towards Gosport and turn left at first cross roads . It's on your right. Seem to recall it was about 10 pounds fitted some 4 or 5 years ago.
Cheers
Paul
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Spaceman
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Re: Keel pump
Reply #2 - 01.06.2019 at 20:18:49
 
Hello Paul thank you for your prompt reply, I know Dell Quay very well good to know you are nearby.
I was hoping that there was an air bleed screw or valve that would get rid of the air.
I have seen an allen bolt just by the lever and wondered if this was an air bleed.

Thank you for the info on the specialist in Fareham this firm was named on another thread.

Simon
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Pompeydave
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Re: Keel pump
Reply #3 - 03.06.2019 at 15:49:33
 
Hi Simon, are you berthed opposite the ECA? If you are you're two berths up from me!
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Jonathan
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Re: Keel pump
Reply #4 - 20.06.2019 at 15:19:29
 
Hello Simon,

You probably have this sorted by now. If not I have had a similar problem a few times usually because the level in the reservoir has dropped too low and I have unwittingly pumped air into the system. The air bubbles then compress and mean you only get lift from the last part of the handle travel. The cure I have found is to let the keel right down then top up the reservoir to absolutely full. You might want to let it stand a while for air bubbles in the reservoir to find their way out and possibly top up.

As you use the system likely more air bubbles will be expelled via the reservoir. Reasons I have found as to why the level has dropped too low have been these. Leak past the washer on the pump piston, leak around the stop/open screw and letting the keel down too fast as it causes bubbles in the reservoir and some oil escapes through the air hole in the cap. The level does not need to fall much on my boat to cause a problem so two or so checks mid season are worthwhile. I have never in many years had a leak from the hose unions nor from the Ram itself - any such would be visible.

I have replaced the washer on the pump piston - got mine from Ernest Doe agricultural engineers for pence. Also replaced hose and unions with one made up by Pirtek who might be able to do the washers. The stop/open screw is simply that a screw which presses on a ball bearing against a spring to open and close the valve -oil can seep down the thread but a bit of PTFE tape will fix it.

Lastly you can get foreign bodies in the reservoir especially if the washer starts to break up as mine did and a fragment can lodge under one of two ball bearings rendering the valve ineffective. Most likely this is not your problem but I have cured this by removing the pump assembly and flushing out with paraffin.

Watch for any lost oil and keeping the level up is the key and the system is truly elegant simple and reliable. Since working all out I have had years of pleasure with the boat and bar once every time I thought I had a problem it was always the oil too low.
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« Last Edit: 20.06.2019 at 15:22:14 by Jonathan »  
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Spaceman
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Re: Keel pump
Reply #5 - Yesterday at 11:18:55
 
Hi Dave, No, I'm at Tudor top end of the Eastern Road. Good to hear from you - is yours a lifting keel?  Currently I have my lifting keel pump dismantled on my bench hoping to find out where I can purchase the correct seal as it looks worn. Simon
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Jonathan
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Re: Keel pump
Reply #6 - Yesterday at 15:03:30
 
Try an agricultural engineer. That was what I was advised to do by another owner who had a hydraulic problem. There is lots of hydraulic equipment attached to tractors and they need to be able to cope with all sorts. Ernest Doe happened to be recommended but they are not local to you. When I went there with the piston and pump it did not take them long to rummage in a series of bins to locate the exact right part so I am guessing another good agricultural engineer could do the same.
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