FORM NO. 3318–948 Rev. A Wheel Horse 42” Rear Discharge Mower for Classic Garden Tractors Model No. 78350 – 7900001 & Up Operator’s Manual IMPORTANT: Read this manual carefully. It contains information about your safety and the safety of others. Also become familiar with the controls and their proper use before you operate the product.
Introduction We want you to be completely satisfied with your new product, so feel free to contact your local Authorized Service Dealer for help with service, genuine replacement parts, or other information you may require. Whenever you contact your Authorized Service Dealer or the factory, always know the model and serial numbers of your product. These numbers will help the Service Dealer or Service Representative provide exact information about your specific product.
Contents Safety and Instruction Decals . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loose Parts . . . . . . . . . . . . . . . . . . . . . . . . . Attach Height-of-Cut Lever . . . . . . . . . . . . Attach Adjustable Link . . . . . . . . . . . . . . . Installing the Mower . . . . . . . . . . . . . . . . . Front-to-Rear Blade Slope . . . . . . . . . . . . . Transport Height Adjustment . . . . . . . . . . . Removing the Mower . . . . . . . . . . . . . . . . .
Safety Safety and Instruction Decals Safety decals and instructions are easily visible to the operator and are located near any area of potential danger. Replace any decal that is damaged or lost. ON LEFT AND RIGHT REAR OF MOWER (Part No. 43–8480) NEXT TO H-O-C LEVER (Part No. 106748) 2 ON MOWER LEFT AND RIGHT SIDES (Part No.
Assembly Loose Parts Note: Use the chart below to identify parts used for assembly. DESCRIPTION QTY. Height-of-cut lever 1 Spring 1 V belt 1 Idler assembly 1 Belt cover 1 Locknut 1 Operator’s Manual 1 USE Install height-of-cut lever Install mower to tractor Read before operating Attach Height-of-Cut Lever Attach Adjustable Link 1. Loosen nuts securing quadrant to mower(Fig. 1). 1. 2. Place spring onto long pin of lever. Compress spring and slide lever into square tube.
Assembly Installing the Mower 1. Park the machine on a level surface, disengage the power take off (PTO), set the parking brake, and turn the ignition key to “OFF” to stop the engine. Remove the key. 2. Turn the front wheels fully to the left and raise attachment lift lever all the way to the latched position; refer to tractor Operator’s Manual. 3. Open front and mid-mount hitches by pushing release button and moving lock handles forward (Fig. 3). 2 4.
Assembly 7. Rotate front mounting shaft so fork faces up and align so spacers are between mid-mount hitch plates (Fig. 5). 8. Lift mower with attachment lift and guide fork to capture hitch rod (Fig. 5). Close mid-mount hitch lock handle. 10. Remove hairpin cotters from trunnion and bottom of yoke (Fig. 7). 11. Unlatch and remove locking clevis pin that secures yoke assembly to clutch shaft. Pivot yoke out and forward to remove from clutch shaft and engagement plate (Fig. 7). 12.
Assembly 16. Check that spacer is on shaft and install belt cover with rod in hole. Secure with locknut (Fig. 9). 17. Turn knob counterclockwise to tighten belt (Fig. 9). Tighten until there is 1” (26 mm) belt movement between engine clutch and idler pulley when slight pressure is applied to the belt. Front-to-Rear Blade Slope Check the front-to-rear blade slope any time you install the mower. Before checking the slope, set air pressure in the front and rear tires to 12 psi (.85 kPa).
Assembly 5. To adjust front-to rear blade slope turn locknut on rear adjustable link (Fig. 11). Transport Height Adjustment Note: Transport height is adjusted to stabilize the mower in the up, locked position. To raise the front of the mower, turn locknut clockwise, to lower front turn counterclockwise. 1. Raise attachment lift lever all the way to the latched position. Check if bumpers, on rear of mower draft bars contact under footrests. 2.
Assembly Removing the Mower 1. Park the machine on a level surface, disengage the power take off (PTO), set the parking brake, and turn the ignition key to “OFF” to stop the engine. Remove the key. 2. Remove the two wing nuts and belt cover from the tractor (Fig. 13). 4. Remove hairpin cotters from trunnion and bottom of yoke (Fig. 15). 5. Unlatch and remove locking clevis pin that secures yoke assembly to clutch shaft.
Assembly 10. Open mid-mount hitch lock handle. Lower mower with attachment lift and remove front mounting shaft (Fig. 17). 1 2 m–2825 Figure 17 1. Mid-mount hitch 2. Front mounting shaft 11. Remove hairpin cotter and washer from attachment lift pin from slot in center lever bar (Fig. 18). 1 2 3 4 m–2824 Figure 18 1. Attachment lift 2. Slot-center level bar 3. Washer 4. Hair pin cotter 12.
Operation Operating the Power Take Off (PTO) Attachment Lift Lever The power take off (PTO) engages and disengages power to the clutch. The attachment lift lever (Fig. 20) is used to raise and lower various attachments. Raising Attachments While the ignition key is in “RUN” position and the power take off (PTO) is engaged, the PTO light in the Indicator Module, will be “ON”. When this light is “ON” it is a reminder; the starter will not crank 1. Depress the clutch and brake pedals to stop the machine.
Operation Attachment Power Lift Adjusting Height-of-Cut The attachment power lift (Fig. 21) is used to raise and lower attachments. The rear gauge wheels are adjusted in different hole location for 1-1/2–3-1/2” (4–9 cm) height-of-cut. 1. Raising Attachments 1. Start the engine, refer to; Starting and Stopping the Engine; in tractor Operator’s Manual. 2. Pull the lift lever in the “UP” direction to raise the attachment lift (Fig. 21).
Operation Tips for Mowing Grass Fast Throttle Setting Ground Speed To improve cut quality, use slower ground speed. For best mowing and maximum air circulation, operate the engine at “FAST.” Air is required to thoroughly cut grass clippings, so do not set the height-of-cut so low, as to totally surround the mower by uncut grass. Always try to have one side of the mower free from uncut grass, which allows air to be drawn into the mower.
Maintenance Service Interval Chart Service Operation Each Use Cutter Blade—check 5 Hours X Grease–Mower spindles, wheels Belts—check for wear/cracks Mower Housing—clean Chipped Surfaces—paint 25 Storage Hours Service X X X X Spring Service Notes X X X X X POTENTIAL HAZARD • If you leave the key in the ignition switch, someone could start the engine. WHAT CAN HAPPEN • Accidental starting of the engine could seriously injure you or other bystanders.
Maintenance Cutting Blade To assure a superior quality of cut, keep the blade(s) sharp. For convenient sharpening and replacement, you may want to have an extra blade(s). 2 1 3 POTENTIAL HAZARD • A blade that is worn or damaged could break apart and pieces could be thrown at bystanders or at you as you use the mower. WHAT CAN HAPPEN • Pieces of blade that may be thrown could 151 Figure 23 1. Cutting edge 2. Curved area 3. Wear/slot forming seriously injure or kill you or bystanders.
Maintenance Sharpening the Blade(s) Installing the Blade(s) 1. 1. Use a file to sharpen the cutting edge at both ends of the blade (Fig. 25). Maintain the original angle. The blade retains its balance if the same amount of material is removed from both cutting edges. IMPORTANT: The curved part of the blade must be pointing toward the inside of the mower to assure proper cutting. 2. 1 Install the washer, blade, flat washer, and the blade nut (Fig. 27).
Maintenance Greasing and Lubrication Blade Drive Belt Service Interval/Specification Removing the Blade Drive Belt Grease the mower after every 25 operating hours or once a year, whichever occurs first. Grease more frequently when operating conditions are extremely dusty or sandy. 1. Remove the mower; refer to Removing the Mower, page 8. 2. Remove pulley cover mounting screws and pulley covers from both blade pulleys. 3. Push on idler to release tension and remove the belt from the pulleys (Fig.
Maintenance Power Take Off (PTO) Belt 1. 4. Unlatch and remove locking clevis pin that secures yoke assembly to clutch shaft. Pivot yoke out and forward to remove from clutch shaft and engagement plate (Fig. 32). 5. Replace belt in inside pulley groove (Fig. 32). 6. Assemble yoke and engagement plate and attach locking clevis pin, trunnion and hairpin cotters to secure (Fig. 32). Remove the two wing nuts and belt cover from the tractor (Fig. 30). 2 1 1 2 2 m–2534 Figure 30 3.
Maintenance 7. Route belt around V and flat pulleys and loop over center mower spindle, top pulley.(Fig.33). 8. Check that spacer is on shaft and install belt cover with rod in hole. Secure with locknut (Fig.33). 9. Turn knob counterclockwise to tighten belt (Fig. 33). Tighten until there is 1” (26 mm) belt movement between engine clutch and idler pulley when slight pressure is applied to the belt. 3 4 Clean dirt and chaff from the outside of the engine’s cylinder head fins and blower housing.
Troubleshooting PROBLEM Abnormal vibration. Blade(s) does not rotate. Uneven cutting g height. g POSSIBLE CAUSES CORRECTIVE ACTION 1. Cutting blade(s) is bent or unbalanced. 1. Install new cutting blade(s). 2. Blade mounting bolt is loose. 2. Tighten blade mounting bolt. 3. Engine mounting bolts are loose. 3. Tighten engine mounting bolts. 4. Loose engine pulley, idler pulley, or blade pulley. 4. Tighten the appropriate pulley. 5. Engine pulley is damaged. 5.
