Bendpak HD-9 Going up Slow

[tomshep]

Hello GJ,

I've got an HD-9 I purchased back in 2017. It's gets weekend use at my home garage. It's the 220 motor. It is going up VERY slow. The motor is running well. I took the fill cap off of the reservoir and there was a significant stream of fluid spraying from the back side of the tank. I can't see where it is coming from. I took the tank off and looked at the pump and pickup and it all looks fine. There is what looks like some sort of a bypass valve at the back that I wonder if may be failing.

Can anyone with a Bendpak take a look in their reservoir when going up and let me know if you see fluid spraying from the back side of the reservoir? Any other comments?

Thank you, Tom

 

[gizardlizard]

Pretty much answered your own question. Oil returns to the tank when the lift is going down and leaves the tank while going up. If you see oil spraying going up, you have a problem.

 

[Al G]

I'd stop using it until you correct the problem. You run the risk of not being able to build enough pressure to lift it off the locks or of it coming down very quickly.

 

[VT JD]

Contact Bendpak directly. They are pretty helpful.

 

[finn]

There’s only a few parts in the pump: a gerotor pump with an inner and outer element running on the aluminum housing body, and a relief valve with a spring. The lowering valve and port is in the same block from what I remember, so there could be a damaged o ring or such there.

If you overloaded the lift, it’s possible that the relief valve pounded out the seat in the aluminum housing, or there’s debris under the seat.

If the pumping element injested debris, there might be scratches / scoring on the aluminum body.

They’re direct drive from a proprietary motor that incorporates a splined shaft.

I failed the motor on my 10k BP asymmetric lift maybe five years ago. I Still have the pump and reservoir if you’re looking for one.

I replaced the entire powerpack with a SPX / Stone assembly. I got mine online from Best Buy Automotive. They had the best prices from a brand I had at least heard of. It was a direct bolt in.

BP didn’t sell motors separately. Only modules including the motor, pump, and tank.

 

[tomshep]

Spoke to Bendpak. The item in question is called a buffer valve and they want a few hundred for the piece of ****. This is a hobby lift and used probably 20 times a month at best.

 

[finn]

Spoke to Bendpak. The item in question is called a buffer valve and they want a few hundred for the piece of ****. This is a hobby lift and used probably 20 times a month at best.

Sounds like the release valve that dumps fluid back to the tank. There’s not much to it. Probably debris under the seat.

Might be loctited in. Should be removable if it’s not staked in place. A little heat will soften the loctite, I imagine.

These aren’t complicated high speed or high pressure hydraulic systems.

 

[70runner]

PRVs are pretty standard throughout the lift industry. As above, see if you can remove it, check any orings, debris. I don't fret too much about cost to keep 2-3 tons safely overhead. There's a couple lift parts stores on the interweb, get the PN from Bendpak and google is your friend.

 

[pelletman]

I needed a proportioning valve for a Hunter lift. I used these guys and they were about a third the price of Hunter, who was slow getting back to me anyway

www.onehydraulics.com​

 

[tomshep]

Over the weekend I removed the buffer valve and took it apart since I have two of them and compared. The original had about 3/4 of an o-ring left but the one I just removed had a few shreds left. I found a replacement o-ring and put it back together and working like a champ again.

 

[kbuhagiar]

Over the weekend I removed the buffer valve and took it apart since I have two of them and compared. The original had about 3/4 of an o-ring left but the one I just removed had a few shreds left. I found a replacement o-ring and put it back together and working like a champ again.

That's great news! Thanks for the follow-up.

 

[tom86951]

Great info thanks. For future reference, do you recall what size/type o-ring you used?

 

[tomshep]

Great info thanks. For future reference, do you recall what size/type o-ring you used?

It was out of my Harbor Freight kit. I expect it will end up failing. I am going to a local hydraulic seal shop and get a better quality 0-ring in the meantime.

Tom

 

[Junkman]

Get spare O-rings and put them in an envelope taped to the post where the pump is mounted. My experience with keeping the spare part with the item it is needed for in the future is that it is rarely required.