lenbo

Thanks much!

I'll check with Afordable.

I called them the other day for a LienBack 3 point Post Hole that they had advertized. I was going to be in the area where they are located (East TN) and they said they are all sold out and the factory has them on back order. They said they were selling like hot cakes and the factory is weeks/months behind on orders.

Thanks

LenBo

Well after putting a Prince HC PTO 7A pump (7gpm) on to see if the BH worked better I was impressed with the additional performance. However when I was trying to make the pump fit, I did not have the resources in my area to make up the proper suction/outlet hose so I modified the factory hose/fittings to allow the BH to work.  After taking the info from Bob Rooks and other members I was concerned that the factory suction set up was not good and would possibly damage the pump. I called Prince and a tech there said to use at least 1¼” line on the suction.  The tech manual for the pump states at least 1” and the pump came with a #16 SAE 1” barb for the intake. The high pressure outlet calls for at least ½” line.

I decided to make some modifications!

First I had to do a modification on the sump tank before I could get started. I removed the tank fitting that holds the in-tank filter and Banjo fitting and cut the center out with a cutting torch so that the male end of a 1¼” street 90 elbow would fit into it. I then welded it in the fitting.  Next I took a 1¼” npt hose barb and screwed it into the elbow, put that modified fitting back in the tank and connected 1.5’ of 1¼” suction hose, another 1¼” npt hose barb to connect the suction line filter rated at 25gpm flow with a 25 micron filter and a Filter Indicator Gauge to measure the vacuum on the filter to determine when it was getting dirty. Connected another 1¼” npt hose barb out of the filter to another 2.5’ of suction hose, then a 1¼” npt hose barb on the other end to connect into the #16 SAE fitting on the pump. With this setup the pump is almost like directly connected to the sump tank with plenty of fluid flow. I also put a digital temp gauge on my valve control panel with a remote sensor inside the return hose where it enters the reservoir tank. Wanted to see how hot the oil got from prolonged use.

Next I had to modify the outlet side of the pump. I connected the #12SAE fitting to the pump with 3’ of ¾” hose to a ¾” “T” with female swivels. On the top of the “T” I put a ¾” to ¼” adapter to put a 3,000psi gauge, on the other end of the “T” I used a ¾” to ½” adapter to connect to the line for the valve control. With the pressure gauge on the line I can adjust my PRV and know what my working pressure is.

Put everything on and filled up with NAPA AW32 hydraulic oil. Started it up and set my PRV at 2,000 – 2,100 psi and watched my pressure gauge while working. All hydraulic cylinders topped out at that psi when loaded. I took my machine to a friend’s property and started digging out some relativity big stumps this morning.

The BH that I have now after the modification is OUTSTANDING! I can’t believe how much difference it made; it’s not the same hoe.  It’s like I bought a $10,000 JD and put it on.  I only ran my tractor at 850 – 900 rpm’s (compared to 2,000 rpm’s with the old pump) and had real good control response and plenty of power in the hydraulic cylinders. Digging stumps and trying to rip the roots apart is probably the hardest workout a BH can get. The bucket & teeth made short work on ripping roots apart, the arm pulled well and the boom didn’t have a problem lifting  I ran the BH for six hours straight at full load digging out some big stumps with lots of roots (sweet gum, cedar) and the BH never slowed down or showed a lack of power. The hydraulic oil only went up to 118F degrees at the highest point. The outside temp was only in the low 70’s so I am sure the oil temp will go up when it gets in the 90’ around here.  I think with the new pump, extra large hoses and a big filter on the suction line worked like a cooler to dissipate any heat.

I just want to thank everyone for their input to assist me in making these modifications.  I was real disappointed with my factory LW-7, now I am real happy with my modified one.

List of parts for modification.