Archive for John Deere
Tractor 3pt Hitch Draft Control Types
First we must determine the meaning of the word draft.
Draft = Depth
Draft = Pulling force
For the purpose of this article it is important to note that a tractors draft control is NOT a depth control system. It is a LOAD control system controlling the load placed on the tractor by an implement and it is set by the operator by the movement of the 3pt hitch hydraulic rockshaft control valve or thru mechanical or electrical movement of the rockshaft valve. Now we can see that this lever also controls/limits the depth an implement may go into the ground but this control of depth is affecting the vertical load placed on the rear of the tractor. As the depth of an implement increases so does the draft (pulling/vertical load) increase until horsepower or traction has reached its limit and the tractor stalls or spins.
For our John Deere tractors they use three types of draft control systems:
Select Control Type: This is the most basic system that John Deere uses to control the 3pt hitch system. This type uses a rockshaft control lever that has an up, down and neutral position. Implement positioning is controlled by how quickly an operator can return the lever to the neutral position. You push the rockshaft control lever forward to lower and back to raise an implement. The middle position is neutral and on newer tractors the control lever will return to neutral automatically as soon as the operator releases the control lever from up or down positions while some older tractors the operator had to return the lever to neutral manually. With this basic system an operator may get the implement in the same position 1 out of 100 times. This type is neither precise nor accurate.
Position Control Type: This type of control system involves a rockshaft control lever that has a full up and full down position as well as the ability of stopping at any point in-between. This JD type usually uses a scaled strip next to the control lever with a moveable stop so an operator may raise and lower the implement to the predetermined “stop” position. If you were looking to have your plow, box blade or mid-mount mower raise and lower by the 3pt hitch to the same position this would be the control type you would want to select. It should be mentioned that the precision and accuracy of the position control is not mentioned and this is due to lack of data but the precision appears to be relatively high.
Load Sensing Control Type: Load-sensing types are normally used in conjunction with the position control type and uses mechanical or electrical sensors to control the positioning of the 3pt arms as load forces increase or decrease. Load-sensing is found on John Deere tractors that are capable of larger ground engaging equipment, as the load-sensing was originally designed for plowing implements. When used with position control the load sensing controls will raise the 3pt arms when the draft increases and lowers them back to the position control set stop point when the load decreases.
Some historical types of load sensing used the top link of the 3pt hitch as the control point. The top link had a coil/leaf/torsion spring that would attach mechanically to the rockshaft control valve and allow for raising or lowering of the 3pt arms based on the load conditions placed on the top link. This mechanical-hydraulic system was very popular. Another variation of this same system mechanically attached to the lower arms verses the top link. This change was more prevalent when farmers were switching from single plows to multi-furrow plow setups. Still there were other older systems that monitored rear axle torque to raise and lower the 3pt arms and ones that used a separate wheel system attached mechanically to the rockshaft control valve to control the 3pt arms.
Newer load-sense control types use electro-hydraulic systems to control the movement of the 3pt arms. One type of the electro-mechanical systems uses electrical sensors the are inside the rockshaft cover or outside and connected to a mechanical lever that attaches to the lower 3pt arms and the control of the rockshaft control valve can be mechanically controlled or with electronic solenoids. Another electrical system uses all electronics to monitor the load on the tractor and move the 3pt arms. It does this with electrical sensors on the 3pt arms or rockshaft and sensors that monitor the speed of the tractor (with the aid of radar, GPS, or axle speed sensors) and either sensor input can cause the movement of the 3pt arms. The electronic systems are all controlled with the aid of an ECU that can monitor all the inputs and control the 3pt arms with no operator input once the system is set and activated.
What is “Regen” or the “Regenerative” function of a FEL Valve? Read it here…
Regen is a “feature” of most modern FEL (Front End Loader) valves, it’s on the Dump (joystick far right) circuit, and is also referred to as “Fast Dump”. The reason it is nice to have is that without it, the weight of a filled bucket can actually “pull” the bucket down faster than the fluid can enter the other side of the cylinder, this will create a air pocket and give the bucket a “floppy” feeling until the joystick is held in the dump mode a few seconds to refill the cylinder pushing the air past the seals. So we add “regen” or “regenerative” function to the valve.
Regen solves this problem by actually filling both sides of the cylinder at the same time with hydraulic fluid. But how will that work you might ask? Well, because there is more volume on the side of the cylinder that extends it since the rod is taking up space in the other side, it “overpowers” the rod side and lets the cylinder extend-thereby dumping the bucket. So since now both sides of the cylinder are “pressurized”, the air pocket cannot develop, eliminating the “floppy” bucket syndrome. One other added bonus is that the bucket actually dumps faster due to the higher flow rate required to do all this, that’s why it’s referred to as “fast dump” sometimes.
So, now you may be asking “This is cool and all that, but why do I need to know about it?” The answer to that is simple, if you ever try to run a snow plow with two SA (single acting) cylinders, or a cylinder that drives a chute rotator on a snowblower you will soon find out that they won’t work if you push the joystick to far right into the regen mode. The plow won’t work because since both lines are pressurized-both cylinders will be trying to extend at the same time binding everything up. The rotator won’t work because there is no weight pushing the cylinder closed like there is on the loader.
On most, if not all John Deere tractors there is a “lockout” the limits how far the joystick travels to the right to keep it out of the regen mode.
The company that started with a plow and is world renown for great farm equipment not surprisingly offers a wide selection of toys, in particular John Deere Toy Tractors. John Deere Farm Toys range from infants to the adult collectible replica enthusiast.
John Deere Learning Curve items offer fun imaginative play to infants through the preschool years. This group of toys is for the beginner. They start with something as simple as a John Deere Tractor Rattle to a 12-volt battery operated John Deere Ride on Tractor. You can find adorable John Deere rattles, massaging corn teethers and sippy cups. Then work your way up to a barn shape sorter, John Deere Busy Driver and even an Electronic Fishing Pole. John Deere even offers imaginative role playing toys to be just like mom and dad. You will find a John Deere Power Saw, Power Drill, Power Line Trimmer and Hedge Clippers that work just like the real thing but don’t require batteries. You may also like the Electronic Action Lawn Mower to help you cut the grass.
John Deere has recently added a line of Wooden barns and accessories. These heirloom quality pieces will hold a vast array of John Deere toys and bring hours of fun to any young farmer. Speaking of heirloom quality, John Deere die-cast pedal tractors are known for lasting for many generations. These heavy duty steel constructed pedal tractors are built tough to stand the test of time and toddlers. Looking for a wide range of John Deere Ride On Toys, well then, you’ve come to the right place. You will find everything from John Deere Toy Tractors that sit and scoot to tricycles and bicycles to wagons and the ever popular 12-volt riding toys. The John Deere Ride on Tractor and Gators are sure to please your little tike.
I’m sure most shoppers looking at John Deere toys have been confused about what size to get. The popular sizes available are 1:16, 1:32 and 1:64 scale. The thing to remember is that they are 1:16, 1:32 or 1:64 the size of the actual piece of equipment. 1:16 is the largest and typically run about 8 – 12 inches long. 1:32 is another common size that runs about 6 – 10 inches long. The 1:64 scale is the smallest size that compares to a matchbox car size. This size is small enough to pack in your purse or bag for church, the doctor’s office or any place your child needs a little entertainment. Most toys in any of these sizes are perfect for a John Deere Kids Toy.
Toys for the big boys include special Collector’s Editions, Precision and Prestige Classic Editions. The Collector’s editions are made of die case metal to last for generations. These are also designed to be exact replicas of the real thing. They contain some realistic features such as opening doors and hoods, movable 3-point hitch, movable gear shift, throttle and hydraulic levers. The details on these collectible are quite remarkable. These toys are John Deere Collectibles and are for the serious collector. These toys will go up in value especially once they have stopped being produced and if they are kept in their original packaging.
As you can see there are several choices of John Deere Toy Tractors something for everyone you know
The following is brochures and literature are the original sale brochures from the older popular tractors. This includes 2 cylinder M tractors, General Purpose tractors, Waterloo Works literature, a Modern Farming literature from 1961 showing the Deere’s New Generation tractors, A, AO, AW, B, etc. I wasn’t sure where to place some of this so I just included it all here since a couple of these deals with the 2 cylinder models.