Installing Orifice in Tractors With Low Hydraulic Flow

causym CAUTION: Escaping fluid under pressure can penetrate the skin causing serious injury. Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids.

If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source. Such information is available from Deere & Company Medical Department in Moline, Illinois, U.S.A.

Hydraulic hoses can fail due to physical damage, kinks, age and exposure. Check hoses regularly. Replace damaged hoses.

To avoid injury from escaping fluid under pressure, stop engine and relieve the pressure in the system before disconnecting or connecting hydraulic or other lines. Tighten all connections before applying pressure.

For tractors with hydraulic flow less than 25 L/min (6.5 gpm), the gate may close before the belt tension arm returns. This may result in belts being pinched between the lower gate roller and axle tube. To correct this situation, install orifice which is available through your John Deere dealer.

1. Raise shield.

2. Clean fittings and valve area before disconnecting hydraulic hoses.

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3. Tag and disconnect hydraulic hoses (A-E). Cap and plug all openings.

NOTE: Tensioning valve is removed for photographic purposes. If necessary, remove nuts from mounting cap screws (F) to raise valve to remove fitting and O-ring (H).

4. Remove tee fittings and O-rings (G) and (H).

IMPORTANT: Be sure orifice is installed flush with valve. It must not be tilted.

5. Install orifice in bottom port "F" of valve block with smooth face towards fitting (H).

6. Install O-rings and tee fittings.

7. Connect all hydraulic hoses.

8. If removed, install and tighten nuts on cap screws in tensioning valve.

9. Lower shield.

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A-Hydraulic Hose, To RH Gate Cylinder Rod End
B-Hydraulic Hose, To RH Tension Cylinder Rod End
C-Hydraulic Hose, To RH Tension Cylinder Base End
D-Hydraulic Hose, To LH Tension Cylinder Rod End
E-Hydraulic Hose, To LH Gate Cylinder Rod End
F-Tensioning Valve Mounting Cap Screws
G-Tee Fitting and O-Ring (Valve Port "E")
H-Tee Fitting and O-Ring (Valve Port "F")

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