Posted by twb1960 on November 20, 2017 at 13:59:06 from (24.199.219.129):
Just before dark I fired up my old 1965 Ford 4400 to push together remnants of a burning brush pile and while pushing the last side, I lost all hydraulics; working one second and not working the next. I was able to back away from the pile letting the front bucket drag along. Using a flashlight I checked around for signs of a busted hose. Having an old machine, I am not a newcomer to busted hydraulic hoses. I saw no signs of leakage. I did notice a noise that was not common. I later discovered the noise was generated by the crank pulley mounted splined hub; the hub splines were damaged and skipping over the splined pump drive shaft.
The backstory is: I bought this machine in late 2009 with the diesel engine of course running good, but the hydraulic power was weak. I found the Vickers Vane Pump input shaft had lots of excess play and pulling air in to the hydraulic system. Initially I was going to rebuild the pump, but after talking with Zip Underwood in or near St Louis, I purchased a new Vickers pump for around $325. I also replaced the pump drive shaft at this time, but did not realize the pulley mounted hub required inspection. I thought the crankshaft was bored and splined. Good thing that is not the way it is done.
So back to today, I disassembled and found the crank pulley hub splines 99% gone. I also noticed the end of the pump shaft splines are a little buggered up. Looks like not enough engagement there. I also noticed I must have (in 2010) pressed the 3 inch coupler too far on the drive shaft, not leaving enough for pump input shaft engagement. As for the splined hub? Probably just a sacrificial part since it is 52 years old.
I checked and can purchase the crank pulley splined hub (C5NNN879A), pump drive shaft (291951) and Splined Coupler (7707570) from Yesterday's Tractors. During reassembly I think I can manage the assembly stack-up to get more coupler to pump input shaft engagement this time. With more engagement, the pump input shaft spline may be OK, but not sure. Since the pump is only 7 years old and I just use it occasionally around a small homestead everything else about the pump is like new. I could purchase a new pump shaft and install it. What do you think? Should there have been something behind the hub bore to keep the shaft from retracting from the pump so much (still engaged, but not enough) when the hub splines failed? I realize the failure had been building and the degrading spline problem probably built up burrs that was driving the pump until that moment of failure. Upon failure, did the drive shaft retract the coupler off the pump shaft some?
1965 Ford 4400 TLB Production Code: 5K26C 1965/Oct 26/Afternoon Shift Model # 44011C: 4000 Series/Utility/Diesel/No PTO/8 speed Serial # C1445201296 Backhoe Model 753 Series Loader Model 735 Series
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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