hydraulic drive system

[andya]

Hi I have a broads boat with a hydraulic drive in it  I think its the old Volvo system , coupled to a 2.5 bmc

I can only see part of the oil filter number on it which is 235 or 532 as I was looking upside down through a mirror. I could not see any letters.  I want to change the hydraulic oil this winter as it has not been done for over 7 years so I need to know what filter it needs and some advice about draining the system, and I thought some bounty owners may give me the help or indeed point me toward a manual.

It looks the same drive as in a lot of bounty's red power pack and the motor looks like some in the bounty's pictures. I don't want to start the service before buying all the parts I need for a full service of the engine and drive unit , as the boat is in use 3 or 4 days a week. Any help would be greatly appreciated.. regards  andya

[Chelsea14Ian]

Hi Andya

 

We to have a hydraulic drive,I do not have the skills to play with the hydraulics or engine,but i know a man who can.He is Graham, at Maffets Loddon.He I am sure can advise you.

 

Ian

[JawsOrca]

andy and welcome to forum.. I'm sure someone will along quickly to help.. Graham at maffetts will certainly be able to help though.. good luck

[andya]

for that folks,  I am a bit of a long ride away from the broads in Beverley east Yorkshire But will see if I can contact mafletts. Not to bothered about my engine as I grew up with the old bmcs and have rebuilt many of them before I retired from the motor trade.  again many thanks for the swift response and recomendations

[BroadScot]

Hi Andy,

 

 Welcome to the NBN forum from me 

 

Iain.

[ranworthbreeze]

Hello Andy,

 

Welcome to the NBN forum from Tan & myself.

 

There are a good number of forum members that offer services on the Broads, please check out our information pages.

 

http://www.thenorfolkbroads.net/forum/forum/87-services/

 

Regards

Alan

[Oddfellow]

Changing the oil in a hydraullic system is a bit complicated. You need to change as much of the oil as you can but, a great deal of it will be in pipework that is less than accessible.

 

Whatever you do, do not run the pump dry.

 

If you are changing the oil because of routine, you shoudl be able to simply drain the tank, drain the pipes  to the pump and motor. This will leave minimal quantities of oil in the system. Then reconnect all pipework and refill, run the engine and top up if necessary. 

 

If you have contaminated oil, you really need to flush the system. There are special rigs for this which can be brought in by specialist hydraullic engineers, but it is hellishly expensive. You can simply disconnect the feed from the tank to the pump and the return  and feed from a new oil container and return it to an empty one. Depending on the condition of the oil, this may take a huge amount of oil to basically flush the system through. This is a relatively simple process, but requires at least two people, is likley to require a quantity of hydraullic fittings to lengthen pipework to facilitate the flushing tanks, some emply containers and a lot of expensive oil.

[andya]

Thanks for that Andy I thought there would be no easy way to drain the system , the lucky bit in mine although the pipes are long, they are easily dismantled so I will only have to drain the pump and motor then and refill after reassembly.

The oil looks ok in the tank but the boat has been stood since it left the broads for Yorkshire in 2005 but I have been running it since march and it seems fine it reaches a speed of 7 knots at 1800 revs on slack water ,  I would imagine it will reach 10to 12 on full throttle. The oil in the tank looks crisp and new with no discolouration at all , but I think for my own peace of mind i would like to change it along with a full engine service and fuel filter alterations i have to do.  Many thanks for your reply it is what i wanted to hear.  best regards  andy

[andya]

Thanks Alan and Iain for your warm welcome, you will notice that Andy Banner has given me most of the advice i need to go ahead with the oil change of my drive.  nice to know we can contact someone even though i am in a different cruising area.   best regards  Andy