Anyone ever replaced a piggy-back pump on a McConnell Pa6085, or similar? 2 hours in and mine’s decided to crack between the center port and one of the threaded holes as a useful “welcome to the new season” gift!?
McConnell 6085 piggy back pump
- Thread starter MrTrim
- Start date
Yes fitted a new rear section to a customers hyd pump last week. [emoji106]Anyone ever replaced a piggy-back pump on a McConnell Pa6085, or similar? 2 hours in and mine’s decided to crack between the center port and one of the threaded holes as a useful “welcome to the new season” gift!?
Was it expensive,.......and do you want to do another one for me this week??
When I've only changed rear sections on the hedge cutter I've never drained the hyd tank. The reason is I have always got blanking plugs with me, but it depends if the pump has an internal common suction port. Which means both suction ports are internally connected. If you have any doubts drain the hyd tank unless inlet taps are fitted then your ok, because once the tank starts to empty it self it's a bugger to stop. Drain it is usually the easy bit getting the oil back in can be a pain.
- Location
- South West
I had one on a PA55 and took the piggy back pump off and turned it over and the gears as leaked around pressure fitting so that port became suction so didn't have pressure .
Was reading about this on the other forum, did you go by the name of Bucking Tanker on there or is that someone else that’s done the same?
Still can’t quite get my head round how that works but I’m no pump engineer! I understand how it stops the leak but in my head it would pump the wrong way, I guess you’d have to rotate it the opposite direction for that though perhaps?!??
- Location
- South West
You need to reverse the casting to alter ports to opposite places. And then lift gears out and swap directions from memory. Worked really well. It's dead easy to do as other port won't be cracked by threads as only been suction.Was reading about this on the other forum, did you go by the name of Bucking Tanker on there or is that someone else that’s done the same?
Still can’t quite get my head round how that works but I’m no pump engineer! I understand how it stops the leak but in my head it would pump the wrong way, I guess you’d have to rotate it the opposite direction for that though perhaps?!??
You must keep the gears and bearing blocks in there original position and just swap over the gear housing. So the inlet and outlet ports are on the opiate side. The only thing to be aware of is that the pump body will not be as efficient. As it will have a wear on the outlet side and also then wear on the new inlet side.
Thanks for all your help guys but after a quick chat with the 5th emergency service that is Martyn in the stores at Halse South West it appears the genuine replacement pump is in fact very sensibly priced and in stock at Halse ready for my collection in the morning! Really can’t recommend these guys highly enough, always super helpful and know exactly what you’re talking about!????
Mr Trim, how did u get on with replacing the piggy back pump? Did u have to drain the oil or do you have a way to stop the flow from the tank? My piggy back on a 6565t was held on with Allen bolts. Bought new in 2016 and with about 500 hours on it, in 2017 one bolt sheared and it began to leak. Fitter managed to loose a lot of oil because of no way to stop oil flow. Absolute nightmare. Next one will be spec’d with some type of gate valve to stop oil flow if at all possible.
Hi Galcam.
My bolts came undone no problem and other than maybe needing an extra pair of hands to hold all the sections together and O-rings in place it really wasn’t too bad. We maybe lost 1 or 2 litres in the switch over, nothing more but I can imagine a sheared bolt needing attention would take some time and yes, if it was apart for too long then the oil through the pump would be a nightmare!
Draining the tank isn’t the worse job in the world though, compared to getting covered in it whilst playing with the pump. We had to drain mine two weeks after doing the pump cos the tank decided to leak on a weld!?#theydontmakethemliketheyusedto!!
Jwbennett90
Member
When you say turn it round do you mean back to front or upside down? As ports are different. I keep having them go every season
- Location
- South West
Just take it off and seam to remember having to take off the cap and moving a few bits which was very simple and then refitting it upside down and the old suction port becomes the power port and the cracked power point becomes the suction port so no pressure so hence no leak
Jwbennett90
Member
OK thank you it's just the suction is a lot bigger than the power. So would I have to change fittings so it would fit on the pipes?
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