I thought someone may find this helpful.
I purchased a 1958 D17 some 25 years ago with a Westendorf WL20 loader with a rear PTO pump. This worked fine for me but my kids and son-in-laws can’t seem to understand how to leave the clutch alone and use the power director to control the movement of the tractor. So I decided to replace the WL20 with an Allis 517 loader. I was able to obtain one from a guy in Iowa who is on this forum. After driving 1600 miles round trip, I got it home and began the switch. This loader had been installed on a series IV D17 with the spacers and with my old tractor I knew I would not need to use the spacers.
The first problem I encountered was that I needed to notch the side frame to accommodate the bolts that mount the front of the engine to the tractor. (see picture 1) That done I next installed the rear frames. Since the frames on a series IV bolt outside the fenders, and on my old 17 they bolt on the inside of the fenders. This required that I cut and redrill the underneath crossover angle. After getting all this mounted, I find that I needed to notch the rear frame so the brake pedal could go down. (see picture 2) Since this loader had no oil reservoir, I used the oil tank from the Westendorf . It was set up for the rear PTO pump, so I turned it around so the oil nipples were now facing the front. It measures 16” x 16” x 4” and holds about 4.5 gal. I bolted it to the rear loader frame with a 2” spacer under it so I have about 8” of oil above the inlet to the pump. (see picture 3) I welded a piece of pipe on the reservoir flange and slipped a welded 90 deg piece of pipe over it so I could mount the 3 spool valve. When I had it where I wanted, I drilled and bolted the two pieces of pipe together so it could not turn. (see picture 4) I welded a flat plate on another small piece of pipe to hold the valve itself and it is held in place with a set screw. (see picture 5) I opted to have the valve on the left side so I can run the loader and the power director at the same time, and a three spool valve so I can install a grapple fork. Next the pump itself. My tractor is old enough that I had to change the crank pulley to accept the splined hub. I did not know at the time, but there is a kit available minus the pump and pulley on this forum. I chose a pump that delivers 23 gpm and a three spool valve with float that will pass 30 gpm. The pump I used matched the mounting plate perfect but it covered the holes used to mount the plate to the tractor. I was able to grind the pump flange on one side so I could use an allen head bolt. There was no way to make the other side fit because of the valve body. I used ½” ready rod and bottomed it out in the tractor housing. I then tapped the hole in the mounting plate and installed a ½” heli coil. I slid the spacer on the ready rod and then screwed the mounting plate on the ready rod. When it tightened up against the spacer, I installed the other spacer and bolt. I then ground off and excess ready rod and mounted the pump. The ready rod cannot work in because it is bottomed out in the housing. It cannot work out because it is against the pump body.
With a 1” suction and a ½” pressure line it all works great. I would have attached the pictures but I don't know how
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