live2plant
Member
Calling all older tractor hydraulic experts. Have power shift 4640 I want to pair with a not yet purchased 1770 16 row planter with CCS and VRD. I am concerned that I have enough hydraulic function before I buy or instead first downgrade a bit. As you go around the dealerships to get opinions, you find they vary along with Deere stats as well. That tractor had a factory pump of 3 cubic cm rated at 20-24 GPM depending on the source except the front wheel assist was standard of 4 cubic cm rated at an agreed 29.5 or 30 GPM. The latter became standard for the 50 Series. I wonder if after 35 years these pumps out there are worn out and thus a new one of the latter is a good place to start. Demand estimates call for needing 2-5 per vacuum motor, 2-3 per VRD motor, 6-7 for CCS or an overall of 17 no VRD and 25 with VRD along with a demand for lift with everything running that will be of 25 or 30 depending on source. Thus it would appear that new pump would offer just enough. Most say not so fast and it will not work just because. I might if I had to drop off the VRD and even CCS and be way under for operations but would it for sure handle it then and have the strength to lift. One may have hit it on the head when he indicated he was more concerned about the fluid volume and size of the oil cooler to keep the fluid cool enough to work especially on a 100 degree day. I have looked at a pto pump, tank and cooler for the motors to keep that much off the tractor's system but CCS remains on the tractor side. When we lift we have the maximum demand on the system but it is brief and the system has much time to rest up so could the problem be that the other functions while less demand add up to so much heat because they keep going from one end of the field to the other. Of interest is that owner's manual information tells just how to hook the planter up to 40 to 60 Series seemingly validating the use of these tractors for the job. What would be the easiest way to cool things down without the cost and hassle of a 6-13 thousand dollar system to separate a couple of functions off. Guys this is a hugh topic because it affects so many people and we simply must find and answer. These tractors are too good of machines to let go to waste and it is getting harder and harder to find any used tractor we can still work with. Many thanks! Greg