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John Deere 5225, 5325, 5425, 5525, 5625 Hydraulic System

Connecting or Disconnecting High-Pressure Hoses

- If possible, retract remote cylinder as much as possible to protect rod from damage.
- Implement must be raised slightly, by pulling back on lever to reset coupler check valves, before it can be lowered.
- If hose accidentally pulls from JD 5225, 5325, 5425, 5525, 5625 tractor during use, clean hose tip and coupler before reconnecting. Hoses can be reinstalled with minimal loss of oil.
- After reinstalling hose, extend and retract cylinder to properly seat connector and reset check valve.
- With as much hydraulic pressure relieved as possible from hoses, pull hoses from couplers.
- Rear SCV: Wipe clean, then close coupler cover. Install dust caps on hose ends.
- Mid-Mount Valve: Make sure coupler dust plugs and hose end dust caps are clean, then install.

Connecting Cylinder Hoses (Rear SCV)

- Identify extend and retract hoses. Extend hoses should be connected to top couplers; retract hoses to bottom couplers.
- Remove dust caps (if equipped) from hose end.
- Open coupler covers.
- Hydraulic hoses can fail due to physical damage, kinks, age and exposure. Check hoses regularly. Replace damaged hoses.
- Making sure hose end and coupler are clean, push hose tip firmly into coupler. Pull on hose to make sure positive connection was made.

Connecting Cylinder Hoses (Mid-Mount Valve)

Hose connections at mid-mount valve are color-coded. Black - Bucket Cylinder-Rod End. Yellow - Bucket Cylinder-Head End. Blue - Lift Cylinder-Head End. Red - Lift Cylinder-Rod End. Orange - Attachment Cylinder-Head End. Green - Attachment Cylinder-Rod End.

- Match hoses to couplers using color-coded dust caps/plugs.
- Remove dust caps from hose ends.
- Pull dust plugs from valve couplers.
- Making sure hose end and couplers are clean, push hose tip firmly into coupler. Pull on hose to make sure positive connection was made.
- Connect mating (color-coded) plugs and caps together.

Connecting and Operating Single-Acting Cylinder

- Single-acting cylinder should only be connected to extend coupler.
- Volume of oil required to extend cylinder will lower transmission-hydraulic oil level.
- With cylinder fully extended, check oil level and fill to proper level (visible at the bottom of the top sight glass).
- Pull SCV control lever back to pressurize and extend single acting cylinder.
- Push SCV control lever full forward to "float" position to retract cylinder.

Operating SCV Control Levers (Basic Valves)

Extend and Retract Cylinders

With hoses properly connected to couplers, pull lever back against spring pressure to extend remote cylinder. Spring pressure returns lever to neutral when released. With lever in neutral, remote cylinder is hydraulically locked in position. Push lever forward against spring pressure to retract cylinder.

Float Position - Push lever forward, through retract, into detent to operate "float" feature. "Float" operation allows cylinder to extend and retract freely, such as when an implement follows ground contour. Manually return lever to neutral when "float" is no longer required.

Setting Detents and Operating SCV Control Levers (Deluxe Valve)

Setting Control Lever Detents - Each section of the deluxe SCV has selectable detents, used to change control lever operations to meet operating requirements of different implements. Detent settings only affect extend and retract lever positions, not "float". Read operator's manual symbol is for reference only and is not a selectable setting. The three settings are: Continuous Detent (Motor), No Detent (Loader), Automatic Detent (Cylinder). Knob setting stop is in the front, center position (bold arrows).

- SCV I-Centered for loader operation - No Detent-Lever returns to neutral when released.
- SCV II-Turned counterclockwise for motor operation - Continuous Detent-Holds lever in operating position until manually returned to neutral.
- SCV III-Turned clockwise for cylinder operation - Automatic Detent-Lever automatically returns to neutral when cylinder reaches end of stroke.

To avoid overheating hydraulic oil and damage to 5225, 5325, 5425, 5525, 5625 John Deere tractor, use SCV I when long duration "continuous" (motor) operation is required. Section I of the deluxe SCV has a flow control valve which, when properly adjusted, provides flow to operate an implement at required speed while maintaining oil temperature within normal operating range. Valve sections II and III can be set to "continuous" (motor) detent, but should only be used for intermittent applications (not exceeding 10 min/hr maximum) or hydraulic oil will overheat and damage JD tractor.

Operating Control Levers

Extend and Retract Cylinders: With hoses properly connected to couplers, pull lever back to extend remote cylinder or push forward to retract.

- When selector knob is set to No Detent (Loader) position, lever returns to neutral when released.
- When selector knob is set to Automatic Detent (Cylinder) position, lever automatically returns to neutral when cylinder reaches the end of stroke.
- When selector knob is set toContinuous Detent (Motor) position, lever must be manually returned to neutral.

With lever in neutral, remote cylinder is hydraulically locked in position.

Float Position: Push lever forward, through retract, into detent to operate "float" feature. "Float" operation allows cylinder to extend and retract freely, such as when an implement follows ground contour. Manually return lever to neutral when "float" is no longer required.

Using Rear SCV to Operate Hydraulic Motor

Deluxe Valve Section I Only - Use SCV I, with adjustable (internal) flow control valve for hydraulic motor operations. Never regulate SCV I oil flow with an external flow control valve. Having two flow control valves in the same hydraulic circuit can overheat oil causing component malfunctions and damage.

Basic Valves and Deluxe Valve Sections II or III - Use external flow control valve to regulate oil flow when operating a hydraulic motor with any basic valve or deluxe valve sections II or III, without internal flow control.

Hydraulic Motor Hose Connections and Control Lever Operations

- Shut off engine. Move SCV control lever full forward, into "float" detent. With deluxe valve, use SCV I control lever.
- Connect hydraulic motor hoses to SCV couplers that correspond to selected control lever. With deluxe valve, use SCV I couplers.
- Deluxe Valve: Set control lever detent for continuous "motor" operation.
- Start engine. To activate hydraulic motor, move control lever back to "retract" position.
- Do not use "neutral" lever position to stop hydraulic motor; use "float". Neutral standby pressure may cause back-pressure damage to hydraulic motor or hoses.
- To stop hydraulic motor, move control lever full forward into "float" detent. Shut off engine and disconnect hoses from couplers.

JD 5225, 5325, 5425, 5525, 5625 Multi-Function Control Lever

A - Multi-Function Control Lever, B - Front-Boom Lower, C - Back-Boom Raise, D - Left-Bucket Rollback (Curl), E - Right-Bucket Tilt (Dump), F - Two-Function Zone, G - Slow Speed, H - Fast Speed, I - Detented "Float" Position, J - Fast Dump Position (Two-Function Control Lever only), K - Third-Function Operations

Overheated hydraulic oil can cause personal injury and component malfunctions. To prevent hydraulic oil from overheating, dont hold multi-function control lever in operating position for an extended period of time. While multi-function control lever (A) can be used to operate other hydraulically driven devices, it is most commonly used to operate a loader attachment. Lever controls lifting and lowering of the boom as well as tilting (dump) and rollback (curl) of the bucket.

Both two-function and three-function control levers use full forward detented position, for "FLOAT" operation. Two-function control lever has a momentarily detented position (full right) used to fast dump the bucket. Additional third-functions are controlled by handle-mounted switch.

- A single function operates when control lever (A) is moved straight away from center, in one-of-four primary directions (front, back, left or right).
- Front-Boom Lower (B) - Full-front (I) is a detented position used for "float" operations.
- Back-Boom Raise (C). Left-Bucket Rollback (Curl) (D).
- Right-Bucket Tilt (Dump) (E) - Two-Function Control Lever: Full-right (J) is a momentarily detented regenerative position where return oil is used to fast dump the bucket.

Two functions operate simultaneously when lever is moved at 45° angles from primary directions, into a two-function zone (F). Two-function zones are: Boom Lower/Bucket Dump, Bucket Dump/Boom Raise, Boom Raise/Bucket Curl, Bucket Curl/Boom Lower. When lever is released to spring-centered neutral position, mid-mount valve holds boom and bucket in position.

Cylinder operating speed depends on how far from center the control lever is moved. When lever is first moved from center, hydraulic functions operate slowly (G), then move progressively faster as lever is moved further away from center, out to fast speed operating position. "Float": Push lever full forward into detent when "float" is desired. "Float" position (I) allows loader boom to move up and down freely while traveling over rough ground. Manually return lever to neutral when "float" is no longer needed.

Transport Lock - Transport lock does not lock out switch operated third-function hydraulics, which are active anytime the key is ON. Push IN to lock / Pull OUT to unlock. Lock is engaged when dashed line is in against body and lever does not move.

Third-Function (Electro-Hydraulic) - Switch controls third-function hydraulics connected to three-function mid-mount valve. Third-function hydraulics are active anytime the key is ON. Top half pressed: Attachment retract/raise (grapple open). Bottom half pressed: Attachment extend/lower (grapple close). Front switch is not operational in this application.

Manually Operating Third-Function (Electro-Hydraulic) Valve Section - Third-function (grapple) valve section can be manually operated if an electrical malfunction occurs. Insert a small diameter punch through access hole and push spool to either extend or retract cylinders as needed to release load.

Adjusting Flow Control-Deluxe SCV and Three-Function Mid-Mount Valve

Flow control adjustment only affects the number I section of rear SCV and the electro-hydraulic (grapple) section of the three-function mid-mount control valve. Other valve sections are not affected by this adjustment.

To adjust flow rate and operating speed, loosen lock nut and turn flow control knob:

- To increase flow rate and speed, turn COUNTERCLOCKWISE (Rabbit).
- To decrease flow rate and speed, turn CLOCKWISE (Turtle).

Rear SCV: If detent kicks out before end of cycle, use SCV I and adjust flow control.

Warming Transmission-Hydraulic System Oil

- Connect jumper hose to SCV I couplers. Knob setting stop is in the front, center position (bold arrow).
- Deluxe SCV: Turn SCV I selector knob to cylinder (automatic) detent position.
- Loosen lock nut and turn flow control knob fully counterclockwise (open). Depress clutch pedal, start engine and idle at 1200 rpm.
- Move SCV I control lever forward or rearward until hydraulic oil warms to operating temperature.
- Turn steering wheel side-to-side to check warm-up progress. When wheel turns smoothly without hesitation, oil has warmed to operating temperature.
- After transmission-hydraulic oil has warmed to operating temperature: Return SCV lever to neutral. Deluxe SCV: Return detent selector and flow control knobs to original positions and setting. Remove jumper hose.

Using Hydraulic Motor Case Drain Connection - Some implement motors have a case drain line used to bleed oil off the motor case and protect the shaft seal. If implement motor is equipped with a case drain hose, attach it to flat-faced drain connector. Make sure hose coupler and drain connector are clean before attaching. Install protective dust cap when connector is not in use.

John Deere 5225, 5325, 5425, 5525, 5625 Hydraulics Troubleshooting

Electro-hydraulic controls: poor position control	Load/depth mix control in wrong position.	Turn load/depth mix control to "position" control detent.
	System is reset.	Enable system.
	Malfunction in lever position sensor circuit or hitch position sensor.

Detent does not hold SCV lever or releases too soon	Detent selector in wrong position.	Turn selector to correct position.
	Pressure restriction with some implements.	Reduce oil flow by changing flow control setting.
	Flow control or detent setting incorrect.	Adjust flow control and/or detent setting.

SCV lever does not release	Detent selector not in automatic detent position.	Turn selector to correct position.
	Built-in pressure leakage with some implements.	Increase oil flow by changing flow control setting.
	Flow control or detent setting incorrect.	Adjust flow control and/or detent setting.