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Re: 1948 Farmall H Series Tractor
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Posted by john d on March 30, 2000 at 06:25:12 from (206.141.74.34):
In Reply to: 1948 Farmall H Series Tractor posted by Gregory Gee on March 30, 2000 at 04:00:17:
You've found the hydraulics control rod. Your tractor has a pump located in front of the transmission behind the clutch. It is driven BY the transmission, and only provides pressure when the clutch is engaged and the control rod is pulled up, or toward the operator. There are three outlet ports on the system, and these are the fittings you describe. The one on the right side of the tractor and the front one on the left side are on the same circuit. The rear port on the left side (in most cases) has a delay action and receives pressure after the front ports. These tractors commonly had mounted cultivators for row crops, and the front ports lifted the gangs that were on the front of the tractor. The delayed-action rear port was timed to automatically raise the rear gang at the end of the row by pulling the control rod and holding it until both front and rear gangs were lifted. The action was timed pretty well for 3rd or 4th gear, depending on tire size. When releasing the pressure there is a detent spot about half way down on the control rod action that releases the pressure on the front port first, the rear port is released by pushing the rod all the way down. This is a single-acting system, which provides pressure in one direction only. The oil returns to the reservoir through the same ports when pressure is released. There are ways to rig it for double acting cylinders, but that involves some plumbing we won't get into here. The system is designed to LIFT things, and let gravity do the work of lowering them. The drain for the system is at the bottom of the pump, and the filler pipe has a cast iron cap which looks more like a knob for something. It's located on the right side of the transmission, at the top, behind the engine and pretty much straight up from the lever the control rod hooks to. The system may or may not have a dipstick left in it. SAE 30 Non-Detergent oil is a good choice for the hydraulic system. Pressure may be anywhere from about 1000 psi down to nearly nothing, depending on condition of the pump and how much it's been fiddled with during any overhaul. Attachments? Hydraulic loader, 3pt hitch, hydraulic lift for a mower, plow, disc, or whatever else you can put a cylinder on. We even used to plumb a return line to the filler cap on our H and run a hydraulic motor on an auger for a fertilizer cart! Congratulations on getting the H. They are a rugged, dependable, versatile, easy-to-work-on, FUN TO OPERATE machine!
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