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View Full Version : Hydro Gear Pump problems after servicing


SKresse
03-28-2010, 07:07 PM
I have a Hydro Gear BDP-10L-117P on a Lesco walk behind mower. It was leaking fluid at the trunnion seal so I decided I would replace the seal. I got a seal kit and took it apart and replaced all the seals in the pump. Put it all back together and now the wheel will not turn. I tried to bleed the system many times by opening the release valve and moving the controls back and forth. When I look in the fluid tank the fluid going back in looks foamy and has bubbles. So I assume air is getting into the system somewhere. Where exactly can air get in? There is one suction hose going to the pump in between the two hoses going to the motor. How do I check to find where air is getting in? Any advise would be great cause i dont want to spent $500 on a new pump.

MowerMedic77
03-28-2010, 08:03 PM
Close the release or dump valve while bleeding the system. You are correct that the middle fitting is the suction line make sure that it(or any of the fittings) is not loose. Especially where it mounts to the pump. I would usually remove one of the larger fittings to get a wrench on it since really no space.

SKresse
03-28-2010, 08:16 PM
I tightened the suction line really tight and I cleaned the fitting out. Is it possible for air to enter between the top mounting plate and the lower housing of the pump? There is a gasket there that I replaced. This is driving my crazy, i checked all the fittings and cleaned everything and it still doesnt work.

Restrorob
03-28-2010, 08:34 PM
Close the release or dump valve while bleeding the system.


Try as MM stated above, And do it with the wheels blocked up off the ground if you haven't done that.

MowerMedic77
03-28-2010, 08:39 PM
I tightened the suction line really tight and I cleaned the fitting out. Is it possible for air to enter between the top mounting plate and the lower housing of the pump? There is a gasket there that I replaced. This is driving my crazy, i checked all the fittings and cleaned everything and it still doesnt work.

Any chance you put the top charge pump on incorrectly? Its the small oval housing ontop of the head and if installed wrong your pump will not work.

SKresse
03-28-2010, 08:39 PM
I have the mower up on blocks, I opened the release valve and moved the controls back and forth about 5 times. Then I closed the release valve and the wheel turns very slow for a few seconds then it comes to a stop. I have tried that numerous times with the same result. And as I pull the controls to move the wheel forward i see foam appearing in the fluid tank.

SKresse
03-28-2010, 08:42 PM
I dont know if I put it on correct or not. Are you talking about the block that is held on with two allen screws. It is oval and I remember looking at it when I put it on and it looked the same if i turned it one way or the other. Is there a difference on wich way it is turned?

ricky86
03-29-2010, 01:28 AM
Yes, a huge difference. The hsg is actually eccentric. Also, did the put the charge pump relief spring and ball in the correct place and in the correct orientation? The ball goes in the pump, and the spring goes in the hsg. The correct gasket or o-ring for the cover is critical also. If you didn't pre-fill the pump, you could have created a dry start situation, possible internal damage and it will take forever to bleed (if at all)

piston slapper
03-29-2010, 05:05 PM
If the wheels barely spin when hydros engaged, spin the wheel by hand while lever is engaged.You may be able to manually remove the airlock. Let go of the wheel when it takes off. Hope you didnt have any pieces left over after assembly.

SKresse
03-29-2010, 07:35 PM
Yes, a huge difference. The hsg is actually eccentric. Also, did the put the charge pump relief spring and ball in the correct place and in the correct orientation? The ball goes in the pump, and the spring goes in the hsg. The correct gasket or o-ring for the cover is critical also. If you didn't pre-fill the pump, you could have created a dry start situation, possible internal damage and it will take forever to bleed (if at all)

I did put the ball and spring in the way you stated. And I did replace the gasket for the cover with a brand new one. I DID NOT pre fill the pump when I initially put it back together. I took the cover back off a second time and it is now filled with oil. Do you think I damaged the pump by not pre-filling it?

SKresse
03-29-2010, 08:14 PM
Yes, a huge difference. The hsg is actually eccentric. Also, did the put the charge pump relief spring and ball in the correct place and in the correct orientation? The ball goes in the pump, and the spring goes in the hsg. The correct gasket or o-ring for the cover is critical also. If you didn't pre-fill the pump, you could have created a dry start situation, possible internal damage and it will take forever to bleed (if at all)

Okay, I am stupid, I put the top cover on backwards. I took it off turned it around. As soon as I fired up the mower the wheels started to spin. It works great now. At first glance the top cover looks the same if turned both ways but now that I looked at it closely I see that it is eccentric. Do you think that did any damadge to the pump by having the cover on backwards??????????? I hope not. Thanks for the help.!!

MowerMedic77
03-29-2010, 09:16 PM
Do you think that did any damadge to the pump by having the cover on backwards??????????? I hope not. Thanks for the help.!!

Sorry I didn't get back to you sooner but it will be fine, glad that worked for you

ricky86
03-30-2010, 12:44 AM
The damage could occur if the pump was empty. Best way to tell is open the filter up. Otherwise ,take a sample of the oil. Your looking for silver or gold color particles. If it drives OK, I would leave it alone.

piston slapper
03-30-2010, 10:27 AM
An easy way to find out the condition of your hydros is to remove the fill cap on the hydro tank , insert a magnet (pickup tool), rake the tank with the magnet. If it comes out looking like a chia pet , it cant be good. Most wear parts in these pumps are magnetic. If the magnet comes out a little silvery, change the filter before it clogs.

ricky86
03-31-2010, 01:10 AM
Yeah, I'm the one who posted that little trick a couple of weeks ago.

piston slapper
03-31-2010, 09:59 AM
Sorry I missed your post. I've been repairing and rebuilding BDP pumps since 98 . Just trying to help.

bigstumpyd
01-24-2011, 07:13 PM
Do any of you guys rebuild them for others?

bigstumpyd
01-24-2011, 08:23 PM
I need to replace bdp-10l-117p! As long as I can find that part number it will work on my mower correct? sorry if im hi jacking but really need to know. I look up that part number and all makes and models come up so im guessing its universal so it should work on my mower? any help would be appreciated!!!!