Hello! This is my first post here. I've been through the forums and am amazed at the quality and quantity of information.
I've got what I believe is a late 1970's B7100 4x4. It's a gear drive unit with 4 lug front wheels. It's got a Kubota/ARPS/Ameriquip backhoe with PTO pump, and a FEL of unknown origin.
Pictures
Bummer #1: The FEL is plumbed off of the backhoe hydraulics. When I step on the clutch, I have no control over the FEL because the PTO stops. It's really difficult to use.
Bummer #2: The FEL is really slow. My friend's B1700HST can tip (dump) it's LA301 in 1.6 seconds while turning 2000 RPM. This operation takes my machine nearly 8 seconds.
Bummer #3: I can't remove the backhoe to use my PTO for other impements without losing my FEL as well.
I think I can solve all 3 problems with a front mount hydraulic pump powering the FEL, and I've recently seen a B6100 with a setup I'd like to replicate. The 6100's pump was mounted to the front bumper area, and was directly in line with the crankshaft. The pump drive shaft was coupled to the front of the motor with a flex chain coupling like this:
There are several mysteries I hope folks can help me unravel...
Mystery #1: The end of my crankshaft has 22 splines, and measures .70" in diameter. Where can I find something that fits these splines? It'd be great if I could use them to drive my new front pump. Alternative suggestions welcome.
Mystery #2: How does the 3pt lift work? Is it a hydraulic operation? With gear oil? There's no hydraulic fluid in this tractor as far as I know.
Mystery #3: I'm trying to size the pump I'd need for the FEL, and would like speedy performance like my friend's machine. All the cylinders are 2" I.D. and the tipper cylinders have 16" travel. Sizing the cylinders and pump, I get:
fluid volume required: pi * R * R * travel * 2 cylinders
3.14 * 1 * 1 * 16 * 2 = 100 cubic inches of fluid required to dump the FEL
100 cubic inches is .43 gallons
My target speed is .43 gallons / 1.6 seconds (from timing my friend's machine) or about 16 gpm at 2000 RPM.
16 gpm!?! If I put a 16gpm pump on my front bumper the little B1700 might tip over!
Have I screwed up the calculations? Is my target of 1.6 seconds too fast? The LA301 cylinders are quite a bit smaller than mine, maybe I just have to live with slow speed? Either way, I can't live with the rear PTO pump, so I'm planning to add a front pump as soon as I can cobble all of the bits together.
Thanks very much for reading all of this, I look forward to insightful replies.
/chris
I've got what I believe is a late 1970's B7100 4x4. It's a gear drive unit with 4 lug front wheels. It's got a Kubota/ARPS/Ameriquip backhoe with PTO pump, and a FEL of unknown origin.
Pictures
Bummer #1: The FEL is plumbed off of the backhoe hydraulics. When I step on the clutch, I have no control over the FEL because the PTO stops. It's really difficult to use.
Bummer #2: The FEL is really slow. My friend's B1700HST can tip (dump) it's LA301 in 1.6 seconds while turning 2000 RPM. This operation takes my machine nearly 8 seconds.
Bummer #3: I can't remove the backhoe to use my PTO for other impements without losing my FEL as well.
I think I can solve all 3 problems with a front mount hydraulic pump powering the FEL, and I've recently seen a B6100 with a setup I'd like to replicate. The 6100's pump was mounted to the front bumper area, and was directly in line with the crankshaft. The pump drive shaft was coupled to the front of the motor with a flex chain coupling like this:
There are several mysteries I hope folks can help me unravel...
Mystery #1: The end of my crankshaft has 22 splines, and measures .70" in diameter. Where can I find something that fits these splines? It'd be great if I could use them to drive my new front pump. Alternative suggestions welcome.
Mystery #2: How does the 3pt lift work? Is it a hydraulic operation? With gear oil? There's no hydraulic fluid in this tractor as far as I know.
Mystery #3: I'm trying to size the pump I'd need for the FEL, and would like speedy performance like my friend's machine. All the cylinders are 2" I.D. and the tipper cylinders have 16" travel. Sizing the cylinders and pump, I get:
fluid volume required: pi * R * R * travel * 2 cylinders
3.14 * 1 * 1 * 16 * 2 = 100 cubic inches of fluid required to dump the FEL
100 cubic inches is .43 gallons
My target speed is .43 gallons / 1.6 seconds (from timing my friend's machine) or about 16 gpm at 2000 RPM.
16 gpm!?! If I put a 16gpm pump on my front bumper the little B1700 might tip over!
Have I screwed up the calculations? Is my target of 1.6 seconds too fast? The LA301 cylinders are quite a bit smaller than mine, maybe I just have to live with slow speed? Either way, I can't live with the rear PTO pump, so I'm planning to add a front pump as soon as I can cobble all of the bits together.
Thanks very much for reading all of this, I look forward to insightful replies.
/chris