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opinions on a 7520

B

Big Jugs

Member
I know they're an older tractor, what are opinions on them? the motor? power? I know an 84 somehting or whatever would be a nicer cab, but money dictates here.
 
They are a tuff old tractor but no creature comforts, they are very noisy, you can not keep the AC working on them,,and as for the engine what normally kills them is a worn camshaft to oil pump gear..a lot of them have 619's in them by now, but if they are an early 619 they still have the cam gear issue,,latter ones had a crank driven oil pump, engine serial # can sort that out for you.. they will get the job done....but I would try to talk you out of one...it's hard to find one that is not worn out...
 
(quoted from post at 18:38:28 10/04/14) I know they're an older tractor, what are opinions on them? the motor? power? I know an 84 somehting or whatever would be a nicer cab, but money dictates here.
Click to expand...

Assuming you are talking about the old articulated 7520 and not the newer rowcrop 7520 ?

Factory: Waterloo, Iowa, USA
Total built: 4,661
Original price (USD): $26,400 (1975)

John Deere 7520 Engine:
John Deere 8.7L 6-cyl diesel

Capacity:
Fuel: 110 gal [416.4 L]
Hydraulic system: 19 gal [71.9 L]

Dimensions & Tires:
Wheelbase: 120 inches [304 cm]
Weight: 22,320 lbs [10124 kg]
Front tire: 18.4-34
Rear tire: 18.4-34

7520 Serial Numbers:
1972: 1000
1973: 1615
1974: 3054
1975: 4999
Final: 5705

John Deere 7520 Power:
Drawbar (claimed): 160 hp [119.3 kW]
PTO (claimed): 175 hp [130.5 kW]
Drawbar (tested): 160.46 hp [119.7 kW]
PTO (tested): 175.82 hp [131.1 kW]

Mechanical:
Chassis: 4x4 articulated 4WD
Steering: hydrostatic power
Brakes: integral hydraulic wet disc
Cab: Cab standard.

Hydraulics:
Type: closed center
Capacity: 19 gal [71.9 L]
Pump flow: 21 gpm [79.5 lpm]
 
Air filter is far too small to be practical & they run hot like all the 20 series did. Very loud. 4 more tires than they need power wise. Built well overall, but look a lot more productive than they are.
 
Disagree with that. They will out work their replacements such as the 8430s and newer tractors and work alongside Versatile 800s. They were a horse for there size if you could stand running them.
 
Wonder if people are confusing the 7520 with the 7020. That is a tractor that was somewhat anemic for its size when it came out. Course I think it was aimed more toward guys farming with 4020s which in that case would make the 7020 a nice jump in hp and productivity.
 
A good friend has one, and I just love it! It's a bit wimpy, though, next to my 'ol 8630.

Some quirks/failings... dry clutch, cable-shifted Hi-Lo that could be problematic, and they do NOT have live PTO.
 
(quoted from post at 19:13:12 10/04/14)
(quoted from post at 18:38:28 10/04/14) I know they're an older tractor, what are opinions on them? the motor? power? I know an 84 somehting or whatever would be a nicer cab, but money dictates here.
Click to expand...

Assuming you are talking about the old articulated 7520 and not the newer rowcrop 7520 ?

Factory: Waterloo, Iowa, USA
Total built: 4,661
Original price (USD): $26,400 (1975)

John Deere 7520 Engine:
John Deere 8.7L 6-cyl diesel

Capacity:
Fuel: 110 gal [416.4 L]
Hydraulic system: 19 gal [71.9 L]

Dimensions & Tires:
Wheelbase: 120 inches [304 cm]
Weight: 22,320 lbs [10124 kg]
Front tire: 18.4-34
Rear tire: 18.4-34

7520 Serial Numbers:
1972: 1000
1973: 1615
1974: 3054
1975: 4999
Final: 5705

John Deere 7520 Power:
Drawbar (claimed): 160 hp [119.3 kW]
PTO (claimed): 175 hp [130.5 kW]
Drawbar (tested): 160.46 hp [119.7 kW]
PTO (tested): 175.82 hp [131.1 kW]

Mechanical:
Chassis: 4x4 articulated 4WD
Steering: hydrostatic power
Brakes: integral hydraulic wet disc
Cab: Cab standard.

Hydraulics:
Type: closed center
Capacity: 19 gal [71.9 L]
Pump flow: 21 gpm [79.5 lpm]
Click to expand...

The other 7520

Factory: Waterloo, Iowa, USA

John Deere 7520 Engine:
John Deere 6.8L 6-cyl diesel

Capacity:
Fuel: 66 gal [249.8 L]

3-Point Hitch:
Rear Type: II, 3N
Rear lift: 7,450 lbs [3379 kg]
8,700 lbs [3946 kg] (optional)

Power Take-off (PTO):
Rear RPMs: 540/1000
Front RPMs: 1000

Wheelbase: 104.3 inches [264 cm]
Weight: 13,280 lbs [6023 kg]

7520 Serial Numbers:
Location: On the main tractor frame, right side, above the front axle.
2003: 1001
2004: 10001
2005: 30001
2006: 45001
2007: 60001

John Deere 7520 Power:
Engine: 150 hp [111.9 kW]
PTO (claimed): 125 hp [93.2 kW]
Drawbar (tested): 110.88 hp [82.7 kW]
PTO (tested): 143.97 hp [107.4 kW]

Chassis: 4x4 MFWD 4WD
Steering: hydrostatic power
Brakes: hydraulic wet disc
Cab: Cab standard.

Hydraulics:
Type: closed-center PFC
Valves: 4
Pump flow: 26.7 gpm [101.1 lpm]

Electrical:
Ground: negative
Charging system: alternator
Charging amps: 115
150

Battery:
Cold-cranking amps: 850
Volts: 12
 
I have a nice running 5020 now, turboed and at 175hp, and a 6030 with brand new motor that I will set at about 250, but the front wheel assist sure is noticeable when the front starts to go down or you go through a soft spot and the front is on top and the rear is spinning....nothing in the front to help pull you through!
 
It's hard to beat the traction of an articulated tractor, even a low horse power 7020 has exceptional traction for light jobs, like towing a 6-7 bottom plow,or 20-25 ft tillage equipment,,but when you ask one to pull 30-35 ft. tillage equipment they just don't have enough power. years ago in 1976 we bought a new 4630, pulled a 6X16 nice, but we bought a 30 ft 230 disk for it and in tough conditions it just did not have the traction to deal with it (we should have put a 21ft behind it) so we went up to a new 8630 ($45,000) which did well for the time, then on up with an 8640 to work with it, then on to a 8970..now we use 2 9400's that do well for what they need to do for the heavy work and 2 4960's and a 8330 to pull the planters, the front wheel assist is good but nothing like the Real 4X4's
a170726.jpg
 
My vote is no...they take serious traction and power..Quad trac machines are about the best for those...I have seen some large 4X4's have trouble dealing with them in tough conditions..
 
(quoted from post at 12:59:13 10/05/14) Long as we are on this subject, will a 7520 handle a tile plow???
Click to expand...

Sand,loam or clay? Making a living or running a few hundred feet to drain a few wet spots.
 
Just curious... there was one at WI farm progress days on a large front assist tractor. The rep talked about needing a 25000 lb machine to handle it.


Ballasting all 8 tires on something like a 7520 doesn't sound like the smartest thing in world, does it???
 
Tile plows and their need for power and traction vary a lot with the terrain, that is for sure. and to make a big tractor do it's job it needs to be weighted properly..There have been some rule of thumb schedule for weight per HP,,I'm thinking it was some thing like 100lbs. per horse power
 
Keep in mind and this is coming from a few guys that still run them around here, parts are getting hard to get and I don't know if I would put it through the abuse of a tile plow. I had one neighbor go completely across the state just to get the rear half of a 7520 at some salvage place just for one little part in the rear that you couldn't find through JD.
 
Yes they are getting used up.. there aren't any left in my area, but at one time there were a lot of them,, we had one for short while years ago, we used it as a second tillage tractor on a wet spring,, it did the job and we moved it on latter that year and went with an 8640 to run with the old 8630...
 
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