Specifications3720SE and 3725QDA ParaLink Coulter Drills™

Model Specifications

The 3720SE and 3725QDA ParaLink™ Coulter Drills are available in 30, 40, 50, 60 and 70 foot working widths.

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Model	30'	40'	50'	60'	70'
No. of Sections	3	3	5	5	5
No. of Rows	2	2	2	2	2
Transport Widths	16'0"	20'5"	20'5	19'10"	22'6"
Transport Height (max)	13'1"	15'1"	14'0"	17'5"	18'7"
Weight (lb)**
7.5" sp. w/ MRBs	N/A	39,000	52,000	N/A	N/A
7.5" sp. w/o MRBs	25,300	32,500	43,600	49,000	N/A
10" sp. w/ MRBs	26,200	33,600	45,500	51,000	65,000
10" sp. w/o MRBs	22,100	28,200	38,400	42,800	55,700
12" sp. w/ MRBs	23,900	31,000	42,000	47,000	60,100
12" sp. w/o MRBs	20,300	26,200	35,800	40,000	52,000
Add for Center HF (lb)	N/A	N/A	N/A	+5,900	Included Above
Add for Full HF (lb)	N/A	N/A	N/A	+7,750	+1,850

** Estimates Only - with standard running gear.

Tires (Hi-Flotation)

Model	30'	40'	50'	60'	70'
Main Frame Front	N/A	N/A	N/A	800/65 R32	800/65 R32
Main Frame Rear	N/A	N/A	N/A	VF 445/50R22.5	VF 445/50R22.5
Wing Front	N/A	N/A	N/A	540/65R24	540/65R24
Wing Rear	N/A	N/A	N/A	IF 320/70R15 Dual wheels	IF 320/70R15 Dual wheels

Tires (non Hi-Flotation)

Model	30'	40'	50'	60'	70'
Main Frame Front	IF 280/70R15 Double-walking casters	IF 320/70R15 Double-walking casters	IF 445/50R22.5 Double-walking casters	IF 445/50R22.5 Double-walking casters	N/A
Main Frame Rear	IF 280/70R15 Dual wheels	IF 320/70R15 Dual wheels	IF 320/70R15 Double-walking casters	IF 320/70R15 Double-walking casters	N/A
Wing Front	IF 280/70R15 Single wheels	IF 320/70R15 Double-walking casters	IF 320/70R15 Double-walking casters	IF 320/70R15 Double-walking casters	N/A
Wing Rear	IF 280/70R15 Single wheels	IF 320/70R15 Dual wheels	IF 320/70R15 Dual wheels	IF 320/70R15 Dual wheels	N/A
HF Center Only Option	N/A	N/A	N/A	Yes	Yes

PCD™ General Specifications

3720, 3725 & 3820 Paralink Coulter Drills™

General Specifications apply to all 3720, 3725 & 3820 ParaLink Coulter Drills™.

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Feature	3720 & 3725 PCD	3820 PCD
Opener Row Spacing	7.5", 10" or 12"
Hydraulic Lock Option	15'' (7.5") , 20'' (10"), or 24'' (12")
Trip Assembly	Independent depth control with in-cab adjustable trip force
Opener Type	ParaLink™ Walking	ParaLink™ Row
Packing Force (lb)	70-230 lbs (walking) 100-330 lbs (locked)	90-180 lbs
Opener Depth Adjustment	Pin-style, ¼" increments (4" total adjustment)	Slot-style, ¼" increments (3½" total adjustment)
Opener Travel	+9"/-7"	+9"/-11"
Packer Options	4.5" Semi-Pneumatic Double Shoulder 4.5" Semi-Pneumatic Double Offset Shoulder	4.5" Semi-Pneumatic V-Style 4.5" Semi-Pneumatic Double Offset Shoulder
Cleaner/Gauge Wheel Options	3" wide spoked wheel 4.5" wide spoked wheel	3" wide spoked wheel 4.5" wide spoked wheel
Air Kits	Single-shoot or Double-Shoot
Blockage Monitors	Optical blockage monitors available in single run (1 per manifold)
Row to Row Spacing	66"
Hitch Options	Category 4 standard hitch, Category 4 Ball and Socket hitch, or Category 5 Ball & Socket hitch
Safety Chain and Lights	Standard
Wing Transport Locks	Standard
MRBs^®	Optional MRB® III, hydraulically actuated
Rear Drop Hitch	For pulling liquid or NH₃ tanks with optional lower hitch pull points

Hydraulic Requirements

3720 & 3820 Paralink Coulter Drills™

Recommended Flow Requirements

Hydraulic flow requirements are highest when turning on the headlands. The recommended flow allows the seeding system to be raised and lowered within two headlands. It should be noted that the recommended fan requirements are for the maximum operational speed (RPM) of the fan.

Minimum Hydraulic Flow Requirements

Recommended hydraulic flow should provide minimal fan slowdown during headland turns. The openers will take hydraulic flow priority over the fans.
If operating at minimum flow requirements, the air seeder fans will drop a minimum of 20% during headland turns. This may require a 3rd headland to allow the openers time to raise and lower.
In typical operating conditions one or both fans are operating at less than maximum output levels, which will reduce hydraulic requirements.

FLOW REQUIREMENTS	MINIMUM GPM	RECOMMENDED GPM
DEPTH CIRCUIT (7.5" spacing with MRB)	24	30
7.5" spacing w/o MRB	18	30
10" spacing with MRB	20	30
10" spacing w/o MRB	15	22
12" spacing with MRB	18	25
12" spacing w/o MRB	13	18

Pressure Requirements

With many tractors, maximum hydraulic flow drops off sharply prior to maximum operating pressure. By setting the tractor to a pressure setting of 3100 psi the hydraulic flow will be near the rated output at the maximum operating pressure.
The 3720 & 3820 ParaLink Coulter Drills™ have a minimum and recommended operating pressure of 2500 psi.

Coupler Requirements

A ½” coupler is only rated for flow rates of 12 gpm. As flow increases beyond this value, a large pressure drop is created across the couplers which in turn increases pressure requirements. The durability of the ½” couplers can also be compromised when operating at high flow rates.
It is recommended to use ¾” couplers on the tractor and implement, as this will greatly reduce the pressure drops and will increase the flow of oil to the fan or opener cylinders.