KUBOTA ZD Series Zero Turn Mower ZD21N-EC ZD21-EC ZD28-EC

ZD21N-EC,ZD21-EC,ZD28-EC WORKSHOP MANUAL ZERO TURN MOWER KiSC issued 09, 2006 A

TO THE READER This WORKSHOP MANUAL has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of ZD21N-EC, ZD21-EC and ZD28-EC KUBOTA ZD Series Zero Turn Mower. It is divided into two parts, “MECHANISM” and “SERVICING” for each section except “ENGINE” section. ■ Mechanism Information on the construction and function are included. This information should be understood before proceeding with troubleshooting, disassembling and servicing. ■ Servicing The heading “GENERAL” includes general precautions, check and maintenance and special tools. Other section, there are troubleshooting, servicing specification lists, checking and adjusting, disassembling and assembling, and servicing which cover procedures, precautions, factory specifications and allowable limits. All information illustrations and specifications contained in this manual are based on the latest product information available at the time of publication. The right is reserved to make changes in all information at any time without notice. April 2004 © KUBOTA Corporation 2004 KiSC issued 09, 2006 A

1 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS BEFORE SERVICING AND REPAIRING • Read all instructions and safety instructions in this manual and on your machine safety decals. • Clean the work area and machine. • Park the machine on a firm and level ground, and set the parking brake. • Lower the implement to the ground. • Stop the engine, and remove the key. • Disconnect the battery negative cable. • Hang a “DO NOT OPERATE” tag in operator station. SAFETY FIRST This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully. It is essential that you read the instructions and safety regulations before you attempt to repair or use this unit. DANGER : Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING : Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION : Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. ■ IMPORTANT : Indicates that equipment or property damage could result if instructions are not followed. ■ NOTE : Gives helpful information. KiSC issued 09, 2006 A

2 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS SAFETY STARTING • Do not start the engine by shorting across starter terminals or bypassing the safety start switch. • Do not alter or remove any part of machine safety system. • Before starting the engine, make sure that all shift levers are in neutral positions or in disengaged positions. • Never start the engine while standing on ground. Start the engine only from operator’s seat. SAFETY WORKING • Do not work on the machine while under the influence of alcohol, medication, or other substances or while fatigued. • Wear close fitting clothing and safety equipment appropriate to the job. • Use tools appropriate to the work. Makeshift tools, parts, and procedures are not recommended. • When servicing is performed together by two or more persons, take care to perform all work safely. • Do not work under the machine that is supported solely by a jack. Always support the machine by safety stands. • Do not touch the rotating or hot parts while the engine is running. • Never remove the radiator cap while the engine is running, or immediately after stopping. Otherwise, hot water will spout out from radiator. Only remove radiator cap when cool enough to touch with bare hands. Slowly loosen the cap to first stop to relieve pressure before removing completely. • Escaping fluid (fuel or hydraulic oil) under pressure can penetrate the skin causing serious injury. Relieve pressure before disconnecting hydraulic or fuel lines. Tighten all connections before applying pressure. AVOID FIRES • Fuel is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in your working area. • To avoid sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last. • Battery gas can explode. Keep sparks and open flame away from the top of battery, especially when charging the battery. • Mark sure that no fuel has been spilled on the engine. KiSC issued 09, 2006 A

3 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS VENTILATE WORK AREA • If the engine must be running to do some work, make sure the area is well ventilated. Never run the engine in a closed area. The exhaust gas contains poisonous carbon monoxide. PREVENT ACID BURNS • Sulfuric acid in battery electrolyte is poisonous. It is strong enough to burn skin, clothing and cause blindness if splashed into eyes. Keep electrolyte away from eyes, hands and clothing. If you spill electrolyte on yourself, flush with water, and get medical attention immediately. DISPOSE OF FLUIDS PROPERLY • Do not pour fluids into the ground, down a drain, or into a stream, pond, or lake. Observe relevant environmental protection regulations when disposing of oil, fuel, coolant, electrolyte and other harmful waste. PREPARE FOR EMERGENCIES • Keep a first aid kit and fire extinguisher handy at all times. • Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone. KiSC issued 09, 2006 A

4 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS · The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list. SAFETY DECALS KiSC issued 09, 2006 A

5 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS KiSC issued 09, 2006 A

6 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SAFETY INSTRUCTIONS KiSC issued 09, 2006 A

7 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SPECIFICATIONS SPECIFICATIONS W1028929 Model ZD21N-EC ZD21-EC ZD28-EC Maximum gross power (SAE) 15.7 kW (21 HP)* 1 20.9 kW (28 HP)* 1 Engine Model D782-E-XFM5 D1105-E2-ZD Type Indirect injection, vertical, water cooled, 4-cycle diesel engine Number of cylinders 3 Bore and stroke 67.0 × 73.6 mm (2.64 × 2.90 in.) 78.0 × 78.4 mm (3.07 × 309 in.) Total displacement 778 cm 3 (47.5 cu.in.) 1123 cm 3 (68.5 cu.in.) Rated revolution 3200 rpm 3000 rpm Combustion chamber Spherical type (E-TVCS) Fuel injection pump Bosch MD type mini pump Governor Centrifugal ball mechanical governor Injection nozzle Bosch throttle type Injection timing 0.33 to 0.37 rad (19° to 21°) before T.D.C. Injection order 1-2-3 Injection pressure 13.73 MPa (140 kgf/cm 2 , 1990 psi) Lubricating system Forced Iubrication by gear pump Cooling system Pressurized radiator, forced circulation with water pump Lubricating oil API Service classification CC or CD, Below 0 °C (32 °F) : SAE 10W or 10W-30, 0 to 25 °C (32 °F to 77 ° F) : SAE 20 or 10W-30, Above 25 °C (77 °F) : SAE 30 or 10W-30 Starting system Electric starter (12 V, 1.1 kW) Battery 51 R (12 V, 450 CCA) Fuel No. 2-D Diesel fuel (ASTM D975) [No. 1-D diesel fuel, if temperature is below – 10 °C (14 °F)] Capacities Fuel tank 30 L (5.8 U.S.gals., 4.8 lmp.gals.) Engine crankcase 3.5 L (3.7 U.S.qts., 3.1 Imp.qts.) 3.4 L (3.6 U.S.qts., 3.0 Imp.qts.) Engine coolant 2.6 L (2.7 U.S.qts., 2.3 Imp.qts.) 3.8 L (4.0 U.S.qts., 3.3 Imp.qts.) Recovery tank 0.25 L (0.26 U.S.qts., 0.22 Imp.qts.) Transmission (Including HST and cylinder) 4.0 L (4.2 U.S.qts., 3.5 Imp.qts.)* 2 Rear axle gear case 1.8 L (1.9 U.S.qts., 1.6 Imp.qts.)* 2 each Mower gear case oil 0.40 L (0.42 U.S.qts., 0.35 Imp.qts.) Tires Front 15 × 6.0-6 (4PR) Rib Rear 23 × 10.5-12 (4PR) Turf 24 × 12.0-12 (4PR) Turf Travelling speeds Forward 0 to 14.5 km/h (0 to 9.0 mph)* 3 0 to 15.0 km/h (0 to 9.3 mph)* 3 0 to 15.0 km/h (0 to 9.3 mph)* 4 Reverse 0 to 8.0 km/h (0 to 5.0 mph)* 3 0 to 8.3 km/h (0 to 5.2 mph)* 3 0 to 8.3 km/h (0 to 5.2 mph)* 4 NOTE: * 1 Manufacturer’s estimate * 2 Oil amount when the oil level is at the upper level. * 3 At 3200 engine rpm * 4 At 3000 engine rpm KiSC issued 09, 2006 A

8 ZD21N-EC, ZD21-EC, ZD28-EC, WSM SPECIFICATIONS The company reserves the right to change the specifications without notice. W1031261 The company reserves the right to change the specifications without notice. W1029898 Model ZD21N-EC ZD21-EC ZD28-EC Dimensions Overall length 2040 mm (80.3 in.) 2260 mm (90.0 in.) Overall width (Without mower) 1328 mm (52.3 in.) 1451 mm (57.1 in.) Overall height 1178 mm (46.4 in.) 1193 mm (47.0 in.) Wheel base 1250 mm (49.2 in.) 1365 mm (53.7 in.) Treads Front 975 mm (38.4 in.) 1065 mm (41.9 in.) Rear 1080 mm (42.5 in.) 1150 mm (45.3 in.) Weight (With mower deck) 560 kg (1234.8 lbs) / With 54" mower deck 570 kg (1256.6 lbs) / With 60" mower deck 652 kg (1437.7 lbs) / With 60" mower deck 676 kg (1490.6 lbs) / With 72” mower deck PTO Shaft drive KUBOTA 10 tooth in spline PTO clutch Wet multi discs Revolution (PTO speed) 1 speed (2530 rpm at 3200 engine rpm) 1 speed (2540 rpm at 3000 engine rpm) PTO brake Wet single disc Steering 2-Hand levers Transmission 2-Hydrostatic transmission with gear Brake Internal expanding shoe / Hand Model RCK54-21NZ-EC RCK54-21NZ-EC RCK60-28Z-EC RCK72-28Z-EC Mower Suitable machine ZD21N-EC ZD21N-EC ZD28-EC Mounting method Quick joint, parallel linkage Adjustment of cutting height Dial gauge Cutting width 1372 mm (54.0 in.) 1524 mm (60.0 in.) 1829 mm (72.0 in.) Cutting height 25 to 127 mm (1.0 to 5.0 in.) Weight (Approx.) 103 kg (227 lbs) 120 kg (265 lbs) 150 kg (331 lbs) Blade spindle speed 50.1 r/s (3006 rpm) 44.6 r/s (2676 rpm) 44.8 r/s (2688 rpm) 40.0 r/s (2400 rpm) Blade tip velocity 74.7 m/s (14701 fpm) 73.4 m/s (14445 fpm) 73.6 m/s (14484 fpm) 78.5 m/s (15449 fpm) Blade length 475 mm (18.7 in.) 523 mm (20.6 in.) 625 mm (24.6 in.) Number of blades 3 Dimensions Total length 985 mm (38.8 in.) 1025 mm (40.4 in.) 1095 mm (43.1 in.) Total width 1690 mm (60.5 in.) 1845 mm (72.6 in.) 2245 mm (88.4 in.) Total height 300 mm (11.8 in.) Discharge Right side KiSC issued 09, 2006 A

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KUBOTA ZD Series Zero Turn Mower ZD21N-EC ZD21-EC ZD28-EC

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