My brother and I own what he told me was a 1971 model 424 diesel. I have just completed work on the hydraulic system and did a complete front to back checkout of fluids and filters. Our tractor does not have power steering. All told there are 4 chambers that contain oil of some sort. The crankcase is one and we use 10w-40w. From the tractor front to back the next chamber is just south of the clutch assembly. On some units this is where a forward/reverse mechanism is installed resulting in 8 forward and reverse gears when coupled with the Road Gear shifter and the regular 4-speed transmission. I drained and then filled this with 90w. The next section is the transmission which is also open to the differential area. There are two sump areas to drain in order to thoroughly clean it out. Again we filled this with 90w, and yes it takes about 5 gallons, actually it looks like it took a bit over 4 gallons. The last chamber is the hydraulic section that is a self contained cast iron chamber that sits right below the seat. We filled this with Hy-Tran, I think it took about 3 gallons. Now as to the filler plugs. Obviously the engine oil goes in the top of the hood area, just pull off the breather cap and pour it in. The 'shuttle gear' or forward/reverse chamber has a filler plug on the left side of the tractor's cast housing as one sits in the seat facing the steering wheel. We used a siphon gun, kind of like a grease gun with a retractable handle that sucks the oil into the gun and then, with a push of the handle, the oil is discharged into the chamber. Fill until the oil starts to come out of the plug hole. The transmission/differential chamber is filled from a plug just to the right of the shifter. Straight down from the filler plug there is a level-checking plug on the right side of the tractor near the level of the floor plate. Fill into the top plug until oil comes out of the side plug. The hydraulic system is filled through a plug at the extreme right rear top corner of the cast iron housing. When you look into the hole you can see a sleeve that extends down into the chamber. Fill with Hy-Tran until the fluid starts to come into the sleeve area. I hope this helps. As we are not acquainted with all 424 models there may be some differences.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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