Form No. 3440-537 Rev A 60in or 72in Rear Discharge Rotary Mower Groundsmaster® 3200 or 3300 Series Traction Unit Model No. 31971—Serial No. 400000000 and Up Model No. 31973—Serial No. 400000000 and Up Register at www.Toro.com.
This product complies with all relevant European directives. For details, please see the Declaration of Incorporation (DOI) at the back of this publication. WARNING CALIFORNIA Proposition 65 Warning Use of this product may cause exposure to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Contents Safety Safety ....................................................................... 3 General Safety ................................................... 3 Cutting Unit Safety.............................................. 3 Safety and Instructional Decals .......................... 4 Setup ........................................................................ 7 1 Preparing the Machine..................................... 7 2 Installing the CE Kit..........................................
• Keep all parts in good working condition and all hardware tightened. Replace all worn or damaged decals. • Use only accessories, attachments, and replacement parts approved by Toro. Safety and Instructional 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 missing. decal93-6697 93-6697 1. Read the Operator's Manual. 2. Add SAE 80w-90 (API GL-5) oil every 50 hours. decal93-7818 93-7818 1.
decal127-0326 127-0326 decal139-6303 139-6303 3. Remove the key and read the Operator's Manual before performing maintenance. 1. Read the Operator's Manual. 1. Entanglement hazard—read the Operator’s Manual; stay away from moving parts; keep all guards and shields in place. 2. Height of cut decal133-8061 133-8061 decal139-6348 139-6348 1. Height of cut (inches/millimeters) decal138-7359 138-7359 1. Grease every 50 hours. 2.
decal139-6349 139-6349 1. Height of cut (inches/millimeters) decal137-5949 137-5949 2. Mounting holes 1.
Setup Loose Parts Use the chart below to verify that all parts have been shipped. Procedure 1 2 3 4 5 6 7 Description Use Qty. No parts required – Prepare the machine. No parts required – Install the CE kit (if required). Debris guard Bracket Rivet Hex-head bolt Washer Height-of-cut pin Shoulder bolt Spacer 1 1 5 2 2 2 2 2 No parts required – Level the cutting unit. No parts required – Grease the cutting unit. Install the debris guard to the front axle.
3 4 Installing the Debris Guard to the Front Axle Installing the Cutting Unit to the Traction Unit Parts needed for this procedure: Parts needed for this procedure: 1 Debris guard 2 Hex-head bolt 1 Bracket 2 Washer 5 Rivet 2 Height-of-cut pin Procedure Procedure Use 5 rivets to install the bracket and debris guard to the front axle (Figure 3). 1.
7. Use 2 hex-head bolts and 2 washers to secure the castor arms to the lift arms (Figure 5). If you have previously used the bolts to install the cutting unit: Apply thread-locking compound to the threads of the bolts. g296657 Figure 6 g296375 Figure 5 1. Lift arm 2. Castor arm 8. 1. Shoulder bolt 2. Spacer 3. Washer 4. Bolt Torque the bolts to the appropriate specification: 3.
Product Overview Specifications Note: Specifications and design are subject to change without notice. g296783 Width of Cut • • Height of Cut Adjustable from 25 to 152 mm (1 to 6 inches) in 13 mm (1/2 inch) increments Net Weight • • Model No. 31971: 1.52 m (60 inches) Model No. 31973: 1.82 m (72 inches) Model No. 31971: 209 kg (460 lb) Model No. 31973: 236 kg (520 lb) Figure 7 1. Jam nuts 3. Height-of-cut chain Attachments/Accessories 2. U-bolt 7.
Operation Note: Determine the left and right sides of the machine from the normal operating position. CAUTION If you leave the key in the ignition switch, someone could accidently start the engine and seriously injure you or other bystanders. Remove the key from the ignition before you do any maintenance. Adjusting the Height of Cut g031661 Figure 8 The height of cut is adjustable from 25 to 152 mm (1 to 6 inches) in 13 mm (1/2 inch) increments. To adjust the height of cut: 1.
Adjusting the Cutting-Unit Pitch Refer to Figure 9 to determine the combinations of spacers for your desired height-of-cut setting. Note: You may use the shims in any combination above or below the castor-arm hub (as required) to achieve the desired height of cut or cutting-unit level. 3. Push the castor spindle through the castor arm. 4. Install the shims (as they were originally installed) and the remaining spacers onto the spindle shaft. 5. Install the tensioning cap to secure the assembly.
Adjusting the Anti-Scalp Rollers Adjusting the Skid Mount the skid in the lower position when operating in height of cuts higher than 64 mm (2-1/2 inches) and in the higher position when operating in height of cuts lower than 64 mm (2-1/2 inches). Whenever you change the height-of-cut, adjust the height of the anti-scalp rollers (Figure 12). 1. Park the machine on a level surface, lower the cutting unit, engage the parking brake, shut off the engine, and remove the key. 2.
6. If cutting unit adjustments are still needed, find a flat surface using a 2 m (6 ft) or longer straight edge. exceptionally lush and dense grass, you may have to slow down the forward speed and/or raise the height-of-cut to the next higher setting. 7. To ease measuring blade plane, raise the height of cut to the highest position; refer to Adjusting the Height of Cut (page 11). Important: If cutting more than 1/3 of the 8. Lower cutting unit onto the flat surface.
Maintenance Note: Determine the left and right sides of the machine from the normal operating position. Recommended Maintenance Schedule(s) Maintenance Service Interval Maintenance Procedure After the first 2 hours • Tighten the castor wheel nuts. After the first 10 hours • Check the PTO driveshaft-to-gearbox fastener torque. • Tighten the castor wheel nuts. After the first 50 hours • Change the gearbox lubricant. Before each use or daily • Lubricate the castor arm bushings.
Greasing the Bearings and Bushings After the first 50 hours Every 400 hours The gearbox in designed to operate on SAE 80-90 weight gear lube. Although the gearbox comes with lubricant from the factory, check the level before operating the cutting unit. The gearbox capacity is 283 ml (15 fl oz). Service Interval: Every 50 hours Lubricate the grease fittings immediately after every washing. The machine has grease fittings that you must lubricate regularly with No. 2 lithium grease. 1.
g296375 Figure 20 Figure 18 1. Gearbox 2. Bolts and nuts 3. Washer 4. Bolt 1. Lift arm 2. Castor arm g299646 3. PTO driveshaft 5. Remove the bolts and nuts from the PTO shaft (Figure 21) and slide the yoke out of the gearbox. Removing the Cutting Unit from the Traction Unit 1. Park the machine on a level surface with the cutting unit raised. 2. Remove the height-of-cut pins (Figure 19) from the cutting-unit side plates. g299646 Figure 21 1. Gearbox 2. PTO shaft 3.
Servicing the Bushings in the Castor Arms 2. Remove the locknut from the bolt holding the castor wheel assembly between the castor fork (Figure 23). Grasp the castor wheel and slide the bolt out of the fork or pivot arm. The castor arms have bushings pressed into the top and bottom of the tube, and after many hours of operation, the bushings wear. 3. To check the bushings, move the castor fork back and forth and from side to side.
servicing the blades. Only replace or sharpen the blades; never straighten or weld them. On multi-bladed machines, take care as rotating 1 blade can cause other blades to rotate. • 4. Remove the blade bolt, anti-scalp cup, and blade from the spindle shaft (Figure 25). Checking for a Bent Blade After striking a foreign object, inspect the machine for damage and make repairs before starting and operating the equipment. Torque all of the spindle-pulley nuts to 176 to 203 N∙m (130 to 150 ft-lb). 1.
Note: Remove the blades and sharpen them on a grinder. After sharpening the cutting edges, install the blade with the anti-scalp cup and blade bolt; refer to Inspecting and Sharpening the Cutting Unit Blade(s) (page 19). Checking and Correcting Mismatch of Blades If there is mismatch between the blades, the grass will appear streaked when it is cut. This problem can be corrected by making sure that the blades are straight and all of the blades are cutting on the same plane. 1.
Replacing the Drive Belt The blade drive belt, tensioned by the spring-loaded idler pulley, is very durable. However, after many hours of use, the belt will show signs of wear. Signs of a worn belt are squealing when belt is rotating, blades slipping when cutting grass, frayed edges, burn marks, and cracks. Replace the belt if any of these conditions occur. 1. Park the machine on a level surface, lower the cutting unit, engage the parking brake, shut off the engine, and remove the key.
Storage 1. Disengage the PTO, release the traction pedal to the neutral position, and engage the parking brake. 2. Shut off the engine, remove the key, and wait for all moving parts to stop before leaving the operator’s position. 3. Allow the engine to cool before adjusting, cleaning, storing, or repairing the machine. 4.
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Declaration of Incorporation The Toro Company, 8111 Lyndale Ave. South, Bloomington, MN, USA declares that the following unit(s) conform(s) to the directives listed, when installed in accordance with the accompanying instructions onto certain Toro models as indicated on the relevant Declarations of Conformity. Model No. 31971 with 31959 31973 with 31960 Serial No.
California Proposition 65 Warning Information What is this warning? You may see a product for sale that has a warning label like the following: WARNING: Cancer and Reproductive Harm—www.p65Warnings.ca.gov. What is Prop 65? Prop 65 applies to any company operating in California, selling products in California, or manufacturing products that may be sold in or brought into California.
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The Toro Warranty Two-Year or 1,500 Hours Limited Warranty Conditions and Products Covered Parts The Toro Company and its affiliate, Toro Warranty Company, pursuant to an agreement between them, jointly warrant your Toro Commercial product (“Product”) to be free from defects in materials or workmanship for 2 years or 1,500 operational hours*, whichever occurs first. This warranty is applicable to all products with the exception of Aerators (refer to separate warranty statements for these products).
