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INSTALLATION & ADJUSTMENT 

of 

 

Exapta

7777

s UniForce

J

J

J

J

 

  

hydraulic downforce system 

for

 JD 1850, 1860, 1890 (3-section), 1895, 1990, 1690 air drills

 

(See different instructions for box drills, 5-section 1890s.) 

 
Installing the cylinders: 

 
1) Remove the big coil spring on each opener: Lower the openers until they’re touching the 
ground or shop floor, then put circuit in float.  Note: Only remove the first nut from OEM spring’s 
rod (the second nut pre-loads the spring; no need to mess with it).  Knock out roll-pin (roll-pin 
punch provided). Coil spring & rod/clevis apparatus lift out. 
 
2) The lower end of cylinder’s rod slides into the cast 
bushing, and seat it with several whacks with a rubber mallet 
on a solid surface (adding a drop of red Loctite may be 
prudent; provided) (Note: turning the bushing on the rod by 
hand often allows it to go easily; if the bushing won’t go into 
position, use fine emory cloth to clean any paint that may 
have gotten into the bushing’s hole).  
 
3) Set the cy bushing into the large flat washer, then 
into the hole in the cast opener (see photo A).   
 
4) From the bottom side of opener casting, the notched plate 
slides over the cylinder rod and its ears go forward over the 
opener arm (see photo A).  

Position

 

the angled ear of the 

plate behind/below the nut on the boot attachment bolt. 

 

Secure with a 3/4" flange locknut, 

being sure the prongs on 

the end of bushing mate into the notches of the plate as you 
tighten

.  Tighten nut sufficiently that the notched plate sucks 

up tight against the lower end of bushing (Note: the bushing 
is longer than the hole in the shank). 
 
5) Insert pin into top yoke of cylinder, and secure with roll pin.  
 

Installing the support brackets for header hoses: 
 

1) Trays are positioned directly over the rank of 
openers that they serve.  Position the center trays at an 
offset fore/aft so they aren’t directly in line with wing 
trays (see photo B) (they need clearance when wings 
fold). The center section trays are spliced on 40 & 42/43-ft models (also rear center tray on all 

_______________________ 
U.S. Patents Pending. 

 

 

 

 

 

 

                 Instr. revised 13 Dec. 2016. 

Photo A 

Photo C 

Summary of Contents for UniForce

Page 1: ... bushing s hole 3 Set the cylinder bushing into the large flat washer then into the hole in the cast opener see photo A 4 From the bottom side of opener casting the notched plate slides over the cylinder rod and its ears go forward over the opener arm see photo A Position the angled ear of the plate behind below the nut on the boot attachment bolt Secure with a 3 4 flange locknut being sure the pr...

Page 2: ...don t tighten yet CCS drills center rear rank the U brkt goes onto the frame from underneath and the bar on top 2 The trays for wings are single piece The front rank wing trays attach to the frame using the same method as Step 1 but with the appropriate width of U bracket Install the front trays as far forward as possible but square to the drill frame not angled Tighten all bolts locknuts 3 The re...

Page 3: ...s wings making sure the trays don t hit each other Now tighten the flange locknuts holding the trays in place Photo G RH wing rear tray outer end 40 1890 Button head bolts need to be tightened yet Header hose is already installed lying across the U bracket here 1895 is slightly different at this location Photo F LH wing rear tray inner end on 1890 Thru bolt not yet installed here Photo H On CCS dr...

Page 4: ... 90s should be pointed forward up 4 Install the drop hoses the hoses from the header to each cylinder using the specific lengths as noted in the schematic S 21 M 31 L 38 XL 44 Tighten all fittings 5 Install the 46 bridge hoses at the hinge points for the wings these are hoses that span the gap between the header hoses Tighten all fittings Tether the hose so it stays away from pinch points 6 For dr...

Page 5: ...ing that runs it the same UniForce will instead operate on a separate remote Plug the LH ports 3 4 of the UniForce manifold 5 If an accumulator is being used assemble it mount it on the frame see photo and connect it to the fittings that equalize the feeder hoses just behind the valve block don t use the port on the valve block The accumulator should arrive pre charged unless the system was shippe...

Page 6: ... isn t spurting a geyser of oil the rest of the system should still slowly filling with oil there s a lot of gallons involved so be patient You will need to add oil to the tractor during this process This is only the beginning however since these are single action cylinders What really needs to happen is to collapse them push the rod all the way in and preferably on all of them at once This must b...

Page 7: ... reasonably uniform depth of cut Running more than necessary however will cause sidewall compaction Common range is 800 1400 3 If you re drilling in steep terraces and the pressure on the opener circuit drops unacceptably after the opener rank has passed over the terrace peak this means that hydraulic flow is too low which can be remedied by 1 increasing the flow setting for that remote on the tra...

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