IMPORTANT: This bleed procedure is for 4.5 (15 ft) main frame machines ONLY. For 3.6 m (12 ft) main frame machines refer to BLEED HYDRAULIC DEPTH CONTROL SYSTEM-SINGLE POINT DEPTH CONTROL-3.6 m (12 ft) MAIN FRAME.

For ACCUDEPTH machines refer to PREPARE TO CYCLE AND CALIBRATE ACCUDEPTH SYSTEM in ACCUDEPTH Operator's Manual.

To run this procedure, it is suggested to use a tractor capable

of running at 1800 rpm, 113 L/m (30 gpm), 20684 kPa (206 bar) (3000 psi).

If performing bleed procedure on machines running different than 1800 rpm, bleed rate times MUST be adjusted to a 113 Lpm (30 gpm) per minute rate. Example: If tractor is running at 57 Lpm (15 gpm), then double all bleed times.

NOTE: ONLY depth control circuit is bled in this procedure and NOT wing-fold circuit.

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NOTE: Front end of turnbuckles MUST be removed and turnbuckles laid down before starting bleed procedure.

2. Loosen cap screws (A, B) on fore-aft link plates.

A-Cap Screws
B-Cap Screws

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IMPORTANT: When lowering fore-aft links to cylinder, BE SURE to set link on cylinder side WITHOUT any hydraulic hoses or hardware or damage to cylinder can occur.

3. Remove eyebolt lock (A), bushing and hardware (B) from between FRONT fore-aft plates (C). Lower fore-aft links (D) to machine so cylinder can be raised.

Repeat procedure for all fore-aft links.

A-Eyebolt Lock
B-Bushing and Hardware
C-Fore-aft Plates
D-Fore-aft Link

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IMPORTANT: Follow bleed procedure EXACTLY as shown. Once cylinders are bled, turnbuckles MUST be installed BEFORE completing bleed procedure.

IMPORTANT: If performing bleed procedure on machines running different than 1800 rpm, bleed rate times MUST be adjusted to a 113 Lpm (30 gpm) per minute rate. Example: If tractor is running at 57 Lpm (15 gpm), then double all bleed times.

CAUTION: Insure cylinder (A) is tilted slightly rearward against nut (B) and secured with wire or chain. Failure to do this may result in the cylinder falling forward and causing serious injury to you or others.

NOTE: Left-hand main frame cylinder does not have eyebolt nut. Secure cylinder in upright position using chain or wire.

4. Secure cylinders (A) in upright position by leaning cylinders against eyebolt nut (B). Retain cylinders using wire or chain.

5. Repeat process for all depth control cylinders.

IMPORTANT: Follow bleed procedure EXACTLY as shown. Once cylinders are bled, turnbuckles MUST be installed BEFORE completing bleed procedure.

Hydraulic reservoir MUST be filled prior to bleeding and kept FULL throughout entire bleed procedure.

6. Run tractor to 1800 rpm.

7. BLEED DEPTH CONTROL CIRCUIT-

a. Extend depth control cylinder rods fully for 6 minutes.

b. Retract depth control cylinder rods fully for 30 seconds.

A-Cylinder
B-Nut

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c. Extend depth control cylinder rods fully for 4 minutes.

d. Retract depth control cylinder rods fully for 30 seconds.

e. Extend depth control cylinder rods fully for 2 minutes.

f. Retract depth control cylinder rods fully for 30 seconds.

8. ATTACH CYLINDER ROD ENDS-

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CAUTION: If cylinders are not bled as described earlier, machine could drop unexpectedly, causing serious injury or death to you or others. Bleed cylinders correctly.

CAUTION: To avoid injury or death, stand clear of machine when machine is being raised or lowered. Mechanical or hydraulic failure can allow machine to fall rapidly causing serious injury or death to you or others.

CAUTION: Unexpected movement of machine may cause cylinders to fall off support block and cause serious injury to you or others. Use suitable lifting equipment and wood support block under cylinder when installing.

a. Attach cylinder clevis (A) to wheel package using 1-1/4 x 3-7/8 in. drilled pin (B) and 3/16 x 1-3/4 in. spring pins.

b. Repeat process for other depth control cylinders.

9. INSTALL TURNBUCKLES-

A-Clevis
B-Drilled Pin, 1-1/4 x 3-7/8 in.

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IMPORTANT: Turnbuckles MUST be installed now to complete bleed procedure.

Some 4.5 m (15 ft) main frames and all 3.6 m (12 ft) main frame wheel packages will be offset to (B). All other main frame wheel packages are in-line with one another.

See Standard Spacing Diagram for wheel package positions and centerline dimensions (F).

On 5-section 4.5 m (15 ft) main frame machines, place turnbuckle to OUTSIDE (G) of machine when both front and rear wheel modules are IN-LINE. On machines using offset wheel modules, turnbuckles will be installed offset (B). (See Standard Spacing Diagram for correct wheel module location.)

NOTE:

In-Line Installations (A):

• Front and rear step bushings (C) are located on same side and apply to all main frame sizes except 3.6 m (12 ft) main frames.

• Offset Installations (B):

  Front and rear step bushings are located on opposite sides and apply only to 3.6 m (12 ft) main frames.

• ALL Installations:

  Fore-aft links are positioned with hex bushings (D) facing machine front.

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b. Loosen cap screws (A, B) on fore-aft link plates.

A-Cap Screws
B-Cap Screws

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CAUTION: Fore-aft links are heavy and can cause serious injury to you or others. When working keep clear of parts that can drop. Use suitable lifting device to support turnbuckles while hardware is removed.

IMPORTANT: Position ALL fore-aft links with hex bushing ends facing MACHINE FRONT.

NOTE: Side plate hardware must be loose before bushing can be installed.

c. Attach LEFT front link eye between fore-aft link plates (F) using step bushing (B) through eyebolt lock (A), 1/4 x 21/32 x 1-5/8 in. washers (E) against outside of fore-aft plates, 5/8 x 6 in. cap screw and lock nut..

IMPORTANT: Eyebolt MUST be flat against hex bushing to lock properly. DO NOT set eyebolt lock over or against grease fitting if equipped.

d. Align eyebolt lock FLUSH with hex bushing (C) on fore-aft link.

e. Attach eyebolt lock using 1/2 x 2-1/2 x 3.62 in. U-bolt, 5/16 x 0.53 x 1 in. spacers (D) and lock nuts.

f. Tighten hardware.

g. Repeat process for RIGHT fore-aft link.

A-Eyebolt Lock
B-Step Bushing
C-Hex Bushing
D-Spacer, 5/16 x 0.53 x 1 in. (2 Used)
E-Washer, 1/4 x 21/32 x 1-5/8 in. (2 Used)
F-Fore-aft Link Plate

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h. Attach LEFT rear link eye (A) according to link diagram using washer (B), cap screw (C), step bushing (D), washer (E), and lock nut (F). Tighten hardware.

NOTE: Only eyebolts with 51 mm (2 in.) ID are equipped with a grease fitting.

i. Install grease fitting (G) (if equipped) to step bushing.

A-Link Eye
B-Washer, 1/4 x 21/32 x 1-5/8 in.
C-Cap Screw, 5/8 x 6 in.
D-Step Bushing
E-Washer, 1/4 x 21/32 x 1-5/8 in.
F-Lock Nut
G-Grease Fitting (If Equipped)

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NOTE: Attach front (A) and rear (B) wing fore-aft link eyes to INSIDE of machine with step bushings to OUTSIDE.

j. Repeat process for each wing fore-aft link.

A-Front
B-Rear

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CAUTION: DO NOT Adjust machine with UNEQUAL eyebolt lengths. Eyebolt could come out of fore-aft link, causing machine to drop and cause serious injury to you or others. Eyebolt length should be as equal as possible on both ends of the fore-aft link.

k. Distance between fore and aft link eyes need to be SET to following specification.

Specification

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l. Tighten cap screws on fore-aft link plates to specification.

Specification

IMPORTANT: Finish bleed procedure COMPLETELY to ensure air is purged from system.

10. FINAL BLEED PROCEDURE-

A-Cap Screws, 7/8 x 12 in. F Grade-Single Point Depth Control
B-Cap Screws, 5/8 x 7-1/2 in. D Grade-Single Point Depth Control

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CAUTION: When performing wing-fold operation keep yourself and others away from wings. Serious injury or death could occur if wings suddenly fall.

a. Raise machine.

b. Rephase cylinders by pulling and holding SCV I tractor control lever (A) up for 4 minutes.

11. CONDUCT STATIC LEAK TEST-

a. Lower machine so sweeps or harrow tines are 51 mm (2 in.) off ground.

b. Disconnect hydraulic hoses from tractor.

c. Measure cylinder rod lengths, then wait one hour and recheck measurements.

• If cylinder rod measurements are LESS than 6.3 mm (1/4 in.)-Machine OK.
• If cylinder rod measurements are MORE than 6.3 mm (1/4 in.)-Repeat complete bleed procedure.

A-SCV I Tractor Control Lever - Depth Control Cylinders

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