What to do if a single cutting unit motor will not operate or rotates slowly on my Toro 03661 Lawn Mower?
If a single cutting unit motor on your Toro Lawn Mower will not operate or rotates slowly, replace the worn or damaged cutting unit motor and rectify the cross-over relief valve issue. This may occur if the cutting unit motor is worn or damaged or the cross-over relief valve in the cutting unit motor is stuck or faulty.
What to do if there is no traction in either direction on my Toro 03661 Lawn Mower?
If you have no traction in either direction with your Toro Lawn Mower, locate the cause of the trouble and correct it. Potential causes include the parking brake dragging or binding, misadjusted or damaged traction control linkage, low oil level in the hydraulic reservoir, a loosened traction pump bypass valve, a damaged flushing valve in the traction pump, a damaged piston pump check valve, low charge pressure, or worn or damaged wheel motor(s) and/or piston pump.
Why is the steering inoperative or sluggish on my Toro 03661 Lawn Mower?
If the steering on your Toro Lawn Mower is inoperative or sluggish, identify and correct the causes affecting steering operations. Possible causes include worn or binding steering components, a binding steering cylinder, low oil level in the hydraulic reservoir, a stuck or damaged steering relief valve, internal leaks in the steering cylinder, a worn or damaged steering control valve, or a worn or damaged gear pump section.
Why is the hydraulic fluid foaming in my Toro Lawn Mower?
If the hydraulic fluid in your Toro Lawn Mower is foaming, correct the oil level, check the type of oil, and fix any air leaks in the pump suction line. This issue may arise if the oil level in the hydraulic reservoir is low, the hydraulic system has the wrong kind of oil, or the pump suction line has an air leak.
What to do if none of the cutting units will raise or lower on my Toro 03661?
If none of the cutting units on your Toro Lawn Mower will raise or lower, locate the cause of the trouble and correct it. This could be due to a low oil level in the hydraulic reservoir, the MR1 and/or MR2 in the lift control manifold being in the backlap position, a faulty solenoid valve SVRV on the lift control manifold, an electrical problem preventing the SVRV solenoid coil from being energized, or a worn or damaged gear pump section.
Why won't the rear cutting unit motors operate on my Toro 03661 Lawn Mower, but the front ones will?
If the rear cutting unit motors on your Toro Lawn Mower will not operate but the front cutting unit motors will operate, test and replace solenoid valve MSV1 if necessary, ensure the mow/backlap lever is fully rotated, and check for electrical issues. This problem may occur if solenoid valve MSV1 on the mow control manifold is faulty, the mow/backlap lever for the rear cutting units (MR1) is not rotated fully, an electrical problem exists that prevents the MSV1 solenoid coil from being energized, the rear cutting reel(s) is binding, or gear pump section (P1) is worn or damaged.
Why won't the wheel motors hold a load when the traction pedal is in neutral on my Toro 03661?
If the wheel motors on your Toro Lawn Mower will not hold a load when the traction pedal is in neutral, check the charge pressure and replace or repair the valve plate and/or piston shoes. This could be due to low charge pressure or scored valve plate and/or piston shoes in the piston pump.
Why is a single cutting unit lifting slowly or not at all on my Toro 03661?
If a single cutting unit lifts slowly or not at all on your Toro Lawn Mower, clean the debris buildup, check and address any binding, and repair or replace damaged components. The issue might be excessive debris buildup on the cutting unit, a binding lift arm or lift cylinder, a stuck or damaged pilot piston in the lift control manifold, internal leaks in the lift cylinder, or a plugged or damaged flow control orifice in the lift control manifold for the affected cutting unit.
Why won't the rear cutting units raise or lower on my Toro 03661 Lawn Mower, but the front ones will?
If neither of the rear cutting units will raise or lower but the front cutting units will raise and lower on your Toro Lawn Mower, test and replace solenoid valve SV3 if necessary, and check for electrical issues. This could be due to a faulty solenoid valve SV3 on the lift control manifold, an electrical problem preventing the SV3 solenoid coil on the lift control manifold from being energized, a plugged or damaged flow control orifice in the lift control manifold for the rear cutting units (C23 or C23L), or a stuck or damaged check valve in the lift control manifold for the rear cutting units (CV23).
Why is neutral difficult to find on my Toro 03661, or why does it operate in one direction only?
If neutral is difficult to find or the unit operates in one direction only on your Toro Lawn Mower, adjust or repair the traction control linkage and check the piston pump. This could be caused by misadjusted, disconnected, binding, or damaged traction control linkage, a piston pump check relief valve that is not seating or is damaged, or a worn or damaged piston pump.
The Toro 8 and 11 Blade DPA Cutting Units with 5-inch Reels are designed for use with Reelmaster 5210 and 5410 Traction Units. These cutting units are primarily used for mowing turf, offering precision cutting capabilities for various grass types and conditions.
The cutting unit's core function is to precisely cut grass using a reel and bedknife system. The dual knob bedknife-to-reel adjustment system simplifies the adjustment procedure, allowing for optimal mowing performance. This design enables a continual self-sharpening action, maintaining sharp cutting edges and reducing the need for routine backlapping. The cutting unit's aggressiveness of cut, which refers to the angle of the bedknife relative to the ground, significantly impacts its performance. This setting can be adjusted to suit different turf conditions and desired results, with less aggressive settings generally preferred for warm-season grasses and more aggressive settings for cool-season grasses.
The turf compensation spring transfers weight from the front to the rear roller, helping to reduce wave patterns or "marcelling" in the turf. The location of the lift arm chain attachment determines the rear roller pitch angle, further influencing the cutting unit's interaction with the turf.
The cutting units are designed for ease of setup and adjustment. Upon removal from the box, users should inspect the reel for grease, ensure all nuts and bolts are tightened, and verify that the carrier frame suspension operates freely. A kickstand is provided to prop up the rear of the cutting unit when tipping it for bedknife/reel exposure, preventing damage to the bedbar adjusting screws.
The rear shield can be adjusted to optimize grass dispersion. For most conditions, a closed rear shield (front discharge) provides the best dispersion. However, in heavy or wet conditions, the shield can be opened by loosening a cap screw, rotating the shield to the open position, and retightening the screw.
Counterweights are mounted to the cutting unit, and their position can be adjusted based on the specific cutting unit and reel motor configuration.
Daily adjustments are crucial for maintaining optimal cutting performance. Before each mowing session, the bedknife-to-reel contact must be checked. This involves lowering the cutting units onto a hard surface, shutting off the engine, and removing the ignition key. The reel is then slowly rotated in reverse, listening for contact with the bedknife. If no contact is evident, the bedknife adjusting knobs are turned clockwise, one click at a time, until light contact is felt and heard. The adjustment knobs have detents, with each click corresponding to a precise bedknife movement. Light contact is always preferred to ensure the bedknife/reel edges self-sharpen effectively. Excessive contact can accelerate wear and lead to uneven wear.
The height of cut (HOC) is adjusted by loosening locknuts on the height-of-cut brackets and setting the adjusting screw to the desired HOC. The rear roller brackets are adjusted to the desired HOC range by positioning spacers below the side plate mounting flange. The front roller is adjusted to contact the gauge bar, ensuring the entire roller is parallel to the bedknife.
Regular lubrication is essential for the longevity of the cutting unit. Each unit has six grease fittings that require regular lubrication with No. 2 General Purpose Lithium Base Grease. Lubrication points include the front roller, rear roller, and reel bearings. Lubricating immediately after washing helps purge water from bearings and extends bearing life.
The reel bearings should be periodically checked for end play to ensure long life. This involves loosening the reel to bedknife contact, holding a reel blade with a padded glove, and attempting to move the reel assembly side to side. If end play exists, the external set screw securing the bearing adjusting nut is loosened, and the nut is slowly tightened until no end play remains. Over-tightening the bearing adjuster nut should be avoided as it can damage the reel bearings.
Servicing the bedbar involves backing off the bedknife from the reel by turning the bedbar adjuster screws counterclockwise. The spring tension nut is loosened until the washer is no longer tensioned against the bedbar. Locknuts securing the bedbar bolt on each side of the machine are loosened, and the bedbar bolts are removed, allowing the bedbar to be pulled downward. When reassembling, the bedbar is positioned with its mounting ears between the washer and bedbar adjuster, secured with bedbar bolts and washers, and the spring tension nut is tightened until the spring is collapsed, then backed off by half a turn.
The bedknife service limits are provided in charts, indicating when the bedknife needs replacement. Operating with a bedknife below the service limit can lead to poor after-cut appearance and reduced structural integrity. The recommended top and front bedknife grind angle is 3 to 7 degrees. Over time, a slight burr may appear on the front cutting edge of the bedknife, which can be removed with a file to improve cutting. A lead-in chamfer on the right end of the bedknife is designed to last for a portion of the bedknife's life and may need regrinding.
Roller rebuild kits and tool kits are available for servicing the roller. These kits include all necessary bearings, bearing nuts, inner seals, and outer seals, along with installation instructions.
General| Deck Material | Steel |
|---|---|
| Start Type | Recoil |
| Starter Type | Recoil |
| Engine | Briggs & Stratton |
| Engine Type | 4-Cycle |
| Cutting Width | 22 inches |
| Drive System | Rear-wheel drive |
| Wheel Size (Front) | 8 inches |
| Wheel Size (Rear) | 11 inches |
| Weight | 80 lbs |
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